Sany Heavy Industry Co., Ltd.

Hunan Sany Intelligent Control Equipment Co., Ltd.

Sany Heavy Industries Co., Ltd

Xiaogang Yi

Dong Li

Yongdong Liu

Bingbing Chen

Zuoliang Zhang

Yonghong Liu

Xionghui Miao

Shihui Xie

Xiang Zhou

Zhikui Wei

Hong Zhu

Qiulian Deng

Liangrong Li

Yaohui Ou

Jihui Zhou

Guocheng Peng

Chengzhi Guo

Qiang Liu

Dongliang Pu

Antao Chen

Shijian Liu

Mingling Wu

Haibo Tan

Qiang Chen

Songqing Li

Zhekui Quan

Gang Huang

The present application discloses a hydraulic oil cylinder, of which a piston rod () is provided with at least two cushion collars () which are axially slidable along the piston rod (). Axial throttle oil channels () are provided between the cushion collars () and a piston (). A first cushion collar () is provided with a sealing end face (), and an end cover of a rod cavity () is provided with a sealing end face (). The sealing end face () of the first cushion collar contacts with the sealing end face () of the end cover of the rod cavity to form a seal. Hydraulic oil within the rod cavity is discharged through one axial throttle oil channel () to an oil passage B.

Hydraulic oil cylinder, hydraulic cushion system, excavator and concrete pump truck

In one aspect of the disclosure, a cylinder-driven lifting mechanism of a compaction machine includes a cylinder having a first end and a second end, a fixed pulley set, a movable pulley set, a rope having a head end, and a tail end configured to connect a compaction hammer. The first end of the cylinder is connected to a vehicle body of the compaction machine and the second end of the cylinder is connected to the movable pulley set. The rope is wound on the fixed pulley set and the movable pulley set and is then connected to the compaction hammer. When the cylinder performs extension and refraction movement, the movable pulley set moves with the cylinder, the distance between the movable pulley set and the fixed pulley set increases or decreases, and the compaction hammer connected to the tail end of the rope is lifted up or dropped respectively.

Cylinder-driven lifting mechanism of compaction machine and compaction machine

The present invention provides a power gear-shifting transmission and an engineering machinery. The power gear-shifting transmission comprises a clutch shaft assembly (). The clutch shaft assembly () comprises a clutch shaft (), a housing gear () arranged on the clutch shaft (), a clutch disc () arranged within the housing gear (), and a gear-shifting piston () arranged at one end of the clutch disc (). The gear-shifting piston () is pushed by a clear hydraulic medium introduced via a fluid supply passage (); the clean hydraulic medium is supplied by a hydraulic system (). The engineering machinery comprises the power gear-shifting transmission.

Power gear-shifting transmission and engineering machinery

In one aspect of the invention, a boom apparatus used for a concrete pump vehicle includes multiple booms, where the multiple booms comprise a first boom hinge-connected to a turntable of the concrete pump vehicle and a second boom hinge-connected to the first boom. When the boom apparatus is in a folded state, the first boom extends towards a cab of the concrete pump vehicle, and the second boom is further placed above the first boom. The invention also provides a concrete pump vehicle having the boom apparatus.

Boom apparatus and concrete pump vehicle having same

A hydraulic oil cylinder has a buffer sleeve (), a rodless cavity sealing end face (-) and at least one throttle oil channel (-). The buffer sleeve () is sleeved on an additional section () of a piston rod in the rodless cavity (-) and axially slidable along the additional section () of the piston rod. The rodless cavity sealing end face (-) is provided in an oil cylinder cavity between a rodless cavity oil passing hole (-) and the termination of the rodless cavity end face of the piston for the retraction process of the piston rod (), and enables to block the buffer sleeve () and attach to the first end surface (-) of the buffer sleeve thereby forming a sealing surface.

Hydraulic oil cylinder and related equipments, hydraulic buffer system, excavator and concrete pump truck

The invention discloses a pump truck stability control system, which comprises a detecting device and a controlling device, wherein the detecting device is used for detecting current pumping state parameters, boom posture parameters, landing leg posture parameters, pump truck body position state parameters and current numerical signals of external load parameters acting on a boom system of a pump truck, and the controlling device is used for receiving the current numerical signals of the above parameters, calculating the complete machine gravity center position of the concrete pump truck according to the parameters, and performing stability control for the pump truck according to the position of the complete machine gravity center in a pump truck stability area. The stability control system comprehensively takes pump truck own factors and external load influence factors into consideration, gravity center computational precision is high, and construction safety of the concrete pump truck is enhanced. In addition, the invention further provides a pump truck stability control method and a pump truck comprising the pump truck stability control system.

Pump truck stability control system, control method, and pump truck

A concrete pumping structure and a control method thereof are disclosed. The concrete pumping structure includes a first pumping cylinder structure and a second pumping cylinder structure. Each pumping cylinder structure includes a delivery cylinder (), a water tank () and a driving oil cylinder (). The delivery cylinder () has a concrete piston assembly () inside, and during the pumping process, a piston rod () of the driving oil cylinder () drives the concrete piston assembly () to reciprocate in the delivery cylinder (), and the water tank () is positioned between the delivery cylinder () and the driving oil cylinder (). The concrete pumping structure also includes a concrete return hydraulic system, which controls the two driving oil cylinders () and drives the two concrete piston assemblies () to return back to the water tank () during returning the concrete.

Concrete pumping structure and control method thereof

A control method of a mechanical articulated arm, wherein at least two tilt sensors are arranged in different positions of the articulated arm, comprising: calibrating zero positions of tilt sensors when articulated arm does not have elastic deformation, setting position of tail end of articulated arm as point P and point P' before and after elastic deformation of articulated arm, and selecting point R on the articulated arm; detecting angles of two different positions of the articulated arm with the tilt angles before and after the elastic deformation, obtaining the angle offset &#x394;&#x3b8; of the articulated arm due to the elastic deformation, and calculating the length parameter Land the angle parameter &#x3b8;of the articulated arm after deformation based on the lengths of OR and RP&#x2032;; and controlling the action of the articulated arm according to position parameters X&#x2032; and Y&#x2032; (to the point P&#x2032;) obtained according to length parameter Land angle parameter &#x3b8;.

Method and device for controlling mechanical articulated arm

The disclosure relates generally to the field of boom-type engineering machinery, which discloses particularly an engine speed control method used to control an output speed of an engine of a boom-type engineering machine during a boom action including: detecting a load pressure of a hydraulic system and a moving speed of a boom; determining a target speed of the engine according to the load pressure and the moving speed of the boom, by a central control unit; and sending, by the central control unit, the target speed of the engine to an engine control unit, and performing, by the engine control unit, a speed closed-loop adjustment according to a current speed value fed back by the engine, so that a current speed of the engine is consistent with the target speed of the engine. Further aspects are an engine speed control system and a boom-type engineering machine equipped therewith.

Method and system for controlling engine speed and boom-type engineering machine

The present invention provides a boom system, comprising a plurality of joint arms sequentially hinged through a horizontal hinge shaft, and further comprising: mounting two length sensors on each joint arm, wherein one length sensor measures the length of a corresponding joint arm after deformation, and the other length sensor measures the length between it and the distal end of the corresponding joint arm, and there is a preset distance between the two length sensors; mounting a dip angle sensor on each joint arm, and obtaining the angle between the connection line between the two length sensors and a reference plane; a processor which obtains boom system distal end position parameters according to the detection results of the dip angle sensor and the length sensors. The boom system according to the present invention, for a single joint arm, uses a single dip angle sensor and double draw line coders to obtain the distal end position parameters of the joint arm, and can more accurately obtain the boom system distal end position parameters. The present invention also provides an engineering machinery and a boom system distal end position parameter obtaining method.

Boom system, engineering machinery, and a method for acquiring boom system distal end position parameter

A distributing valve for a concrete pump and the concrete pump are provided, the distributing valve comprises a valve body () and a valve core (), and a delivering cavity () is internally formed in the valve body () and is provided with a material inlet, a material outlet () and material suction openings (). The material outlet () is communicated with a delivery pipe and the material suction opening () is communicated with a delivery cylinder (). The valve core () is a L-shaped pipe formed by a first pipe section () and a second pipe section (), and one end of the L-shaped pipe is connected with a hopper () and a revolution fitting surface is formed between the end face of the other end of the L-shaped pipe and the internal face of the valve body ().

Distributing valve for concrete pump and the concrete pump

A matching authentication method for wireless communication equipment comprises that: a device at the transmitting end sends a matching request (S) to a device at the receiving end; the device at the transmitting end receives the response messages feedback from the device at the receiving end, and the response message carry with feature codes (S); the device at the transmitting end obtains the feature codes and takes the feature codes as the authentication and authorization codes communicating with the receiving end. The invention also provides a wireless communication device with the function of matching authentication correspondingly. The wireless communication device comprises a memory unit, a communication unit, and an authentication and authorization unit and a feature code updating unit. The invention also provides a wireless communication system with the function of matching authentication correspondingly.

Matching authentication method, device and system for wireless communication

The present invention discloses a method and device for suppressing vibration of boom of concrete pump truck, in which the boom cylinder is connected with the vibration suppression cylinder; the information about hydraulic pressure in the boom cylinder and/or about changing of concrete pumping direction is monitored by a pressure sensing unit in real time; the monitored information about hydraulic pressure and/or about changing of concrete pumping direction is transmitted to the control unit for vibration suppression cylinder; the control unit for vibration suppression cylinder analyzes and processes the monitored information and adjusts the volumes of the rod side chamber and the non-rod side chamber in the vibration suppression cylinder such that the vibration suppression cylinder may generate a pulsed vibration and the pulsed vibration at the end of the boom is less than or equal to the vibration amplitude caused by the intermittent concrete supply at the end of the boom in amplitude, with a phase difference of 180&#xb0; between the two vibrations. The vibration suppression method and device for boom of concrete pump truck according to the present invention may be simply configured, easily implemented and operated to effectively suppress the boom vibration.

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Changsha, China

Xiaogang Yi