193 results about "Crosshead" patented technology

A connecting rod assembly includes a crosshead for coupling a connecting rod to a plunger, the crosshead having a hole extending through the crosshead. The connecting rod assembly also includes a knuckle cage positioned within the crosshead, the knuckle cage extending through the hole and including a cutout to provide access to a passage formed in the knuckle cage. The connecting rod assembly further includes a knuckle positioned within the passage of the knuckle cage, the knuckle having a mounting surface that is substantially planar, the mounting surface coupling to the connecting rod at a mating end with a substantially planar mating end surface.

The reciprocating compressor comprises a compressor frame, a crankshaft and a connecting rod, connecting the crankshaft to a crosshead. A piston rod connects a piston to the crosshead. The piston reciprocates in a gas compression cylinder. At least one pressure-drop module is positioned between the gas compression cylinder and a crosspiece guide. The piston rod extends from the gas compression cylinder through a pressure-drop chamber of the pressure-drop module. Also disclosed herein is a method of operating a reciprocating compressor.

The invention provides an intelligent air flow adjusting system and method for a reciprocating compressor, and the method comprises the steps: obtaining the real-time pressure, flow and rotating speed data during the operation of the compressor, collecting the state of an air valve and the stress parameter of a crosshead pin through a sensor, and determining the specific distribution condition of the current load and compression work; after the target parameter sequence is obtained, the response time of an executing mechanism is adjusted by adopting a dynamic optimization algorithm according to the opening degree and rotating speed control of the gas flow adjusting valve, and a real-time instruction set of adjusting actions is determined; according to the real-time instruction set, a servo motor drives an air valve and a frequency converter to adjust the rotating speed, and the actual air volume adjusting result and energy consumption data of the compressor under the current load are obtained; according to the adjustment scheme of stress balance, finite element analysis is adopted to simulate the long-term change trend of mechanical wear, and stable operation parameters of the air flow adjustment system under the condition that wear is reduced are determined; and according to the optimization adjustment strategy, the operation logic of the compressor is updated by adopting a self-adaptive control algorithm, and a dynamic response instruction set during next load change is determined.

The application provides a cast power end frame including a pair of end plates and an outer casing extending between the end plates and defining an interior therein; a crank shaft housing extending between the end plates and within the interior of the outer casing, and a plurality of crosshead tubes, each crosshead tube extending substantially perpendicular to the crank shaft housing, wherein the outer casing, crank shaft housing, and crosshead tubes are cast as a single part comprising steel comprising a carbon constituent of 0.06%-1.99% carbon.

The utility model discloses a plunger pump, and belongs to the technical field of oil and gas exploitation, the plunger pump comprises a pull rod, a crosshead, a bearing bush, a connecting rod and a detection piece, one end of the pull rod is fixedly connected with the crosshead, the other end of the crosshead is connected with the connecting rod, and the bearing bush is arranged between the crosshead and the connecting rod; the crosshead is provided with a detection hole, one end of the detection hole extends to the end face of one end, facing the bearing bush, of the crosshead, and the detection piece detects the temperature of the bearing bush through the detection hole. According to the plunger pump, whether the bearing bush of the crosshead is burnt or not can be determined by detecting the working temperature of the bearing bush of the crosshead in the plunger pump, so that a new bearing bush can be replaced in time, the plunger pump can be prevented from being greatly damaged, and it is guaranteed that normal operation can be conducted stably.

The present invention provides an electromagnetic compressor, including a compressor cylinder body, with dead center coils designed at both ends of the compressor cylinder body, and the electromagnetic directions of the coils are opposite to each other with the same poles in the compressor cylinder body after power is applied; a piston coil is provided between the two sets of dead center coils, and the positive and negative poles of the piston coils are electrically connected to the commutator through a guide rod. After the guide rod is connected to the commutator, the piston coil is urged to approach the dead center coil on the opposite side. During the movement of the commutator and the piston head, the position of the guide rod relative to the commutator will change relative to each other, thereby changing the connection direction of the positive and negative poles of the piston coil. The present invention designs a piston compressor based on the principle of electromagnetic induction, and utilizes the same magnetic poles generated at both ends of the cylinder body to make the piston continuously change the magnetic poles at both ends and reciprocate in the cylinder body. The present invention eliminates the crankshaft, crosshead, coupling, motor transmission mechanism, etc. in the traditional piston compressor, and has a simple structure.

The invention discloses a single-cylinder crankshaft upper crank contour optimization composition method which comprises the following steps: firstly, analyzing a single-cylinder inner crank-connecting rod-crosshead motion rule, and finding out a corresponding relation between each motion parameter and a crank contour; the crank, the connecting rod and the crosshead are integrally and reversely rotated, and point location data of the rotating center of the connecting rod and the crosshead are obtained; setting a safety interval and a vertical line to obtain point position data of an intersection point of the crosshead movement line and the crank contour limiting line and tangent point data of the crank contour limiting line on the crank contour; repeating the operation according to the adjusted angle value to obtain a plurality of groups of tangent point data; fitting and processing the multiple groups of tangent point data to obtain a first group of crank limit profile curves and a second group of crank limit profile curves, shifting the outer circle of the crank pin to obtain an auxiliary profile, and connecting the three to obtain a crank profile. According to the method, the contour of the crank can be designed to the maximum extent, the balance performance of the crank is effectively improved, and the application applicability of the crankshaft is enhanced.

The invention discloses a high-power seven-cylinder fracturing pump shell and a fracturing pump in the technical field of fracturing pumps, and aims to solve the problems that in the prior art, the requirements of high pressure and large displacement of a construction site are difficult to meet, and the stability of the whole structure of the fracturing pump is poor. The pump shell comprises a pump shell body, the pump shell body comprises two side bearing seats, the side walls of the two side bearing seats are provided with the same upper arc plate and the same lower arc plate, and a rearview hole cover plate and a connecting rod crosshead box body are arranged between the upper arc plate and the lower arc plate; according to the seven-cylinder fracturing pump shell structure type, under the same rotating speed and stroke working conditions, compared with a five-cylinder fracturing pump, the seven-cylinder fracturing pump is higher in displacement, larger in pressure and lower in discharge pulsation, and the requirements for large displacement and high pressure of a well site can be better met; and meanwhile, through cooperation of the multiple reinforcing rib plates, the stability of the overall structure of the device is ensured, and the using effect of the device is ensured.

The invention discloses a long-stroke fracturing pump power end and a fracturing pump, and relates to the technical field of reciprocating pumps, and the power end comprises an input shaft assembly, a crankshaft gear, a crankshaft assembly, a rocker, a subdivision sliding block, a crosshead, an integral sliding block, a pump body, a sliding shoe and a rocker shaft. External power drives the input shaft assembly to rotate, the input shaft assembly drives the crankshaft assembly to rotate through the crankshaft gear so as to drive the subdivision sliding block to slide, the subdivision sliding block drives the rocker to swing in a reciprocating mode from the middle of the rocker, and the integral sliding block on the lower portion of the rocker drives the crosshead to do synchronous reciprocating motion. The stroke of the crosshead is far greater than the rotation diameter of the crankshaft due to the displacement amplification effect of the rocker, so that the long stroke of the fracturing pump is realized; the crankshaft is arranged right above the sliding shoe, a connecting rod in a traditional fracturing pump is omitted, the stroke of the fracturing pump is increased, but the length is reduced, and the weight is not increased; the fracturing pump power end and the fracturing pump are long in stroke, low in stroke frequency, long in service life of quick-wear parts, compact in structure and convenient to assemble and disassemble.

A liquid nitrogen pump power end assembly relates to the technical field of liquid nitrogen pumps and comprises a crankshaft box body, a crankshaft, a connecting rod and a crosshead assembly. A plurality of wallboards are arranged in the crankshaft box body, crankshaft bearing seats are mounted on the wallboards, a plurality of reinforcing ribs are fixedly arranged between the crankshaft bearing seats and the wallboards, and the crankshaft is rotationally mounted in the crankshaft bearing seats through crankshaft bearings; the crankshaft comprises a straight shaft and an eccentric wheel, the straight shaft penetrates through the crankshaft bearing seat, and the eccentric wheel is mounted on the straight shaft and connected with the connecting rod; the crosshead assembly comprises a crosshead, the inner end of the crosshead is connected with the connecting rod, the outer end of the crosshead is arranged as a mounting end, and a clamping assembly is mounted at the mounting end; the clamping assembly comprises two oppositely-arranged clamping hook pieces, and the distance between the two clamping hook pieces is adjustable in the radial direction of the installation end. The mechanical strength of the crankcase body can be improved, and the gradually-increased operation pressure in China can be met; and the device can be connected with fluid ends of various models, and the installation application range is expanded.

This reciprocating compressor comprises: a crankshaft; a crosshead part that is connected to the crankshaft; a cross guide part that accommodates the crosshead part; and a compression part that is placed on the cross guide part. The cross guide part includes: a plurality of column parts each continuing from the lower end to the upper end of the cross guide part on one outer wall of wall parts constituting the cross guide part; and one or more recessed shape parts formed in a recessed shape so as to be thinner than the plurality of column parts between the plurality of column parts in a first direction in which the crankshaft extends.

The utility model relates to an adjusting and positioning device for machining a crosshead pin of a variable compression ratio part. Comprising a basic positioning mechanism arranged on a working table of a vertical turning and milling machine tool of the machine tool, a V-shaped base used for placing the crosshead pin, an adjustable supporting mechanism used for axially positioning the crosshead pin, and a pressing mechanism used for pressing the V-shaped base and the crosshead pin. All positioning and clamping precision of the crosshead pin before finish machining can be effectively controlled during operation, correction and adjustment are convenient and efficient, the surface of the crosshead pin is effectively protected, and it is ensured that all procedures are finished through one-time clamping station finish machining of all profiles of a piston hole of the crosshead pin on a vertical turn-milling machine tool.

The utility model relates to a tool for disassembling and assembling a connecting rod in a vertical compressor. The tool comprises a clamping assembly, a disassembling and assembling assembly and a base plate. During disassembly and assembly, the clamping assembly and the head of the crosshead are oppositely clamped and fastened, the base plate is matched with the bottoms of the two sides of the lower portion of the crosshead, when the crosshead is disassembled and assembled, the clamping assembly and the head of the crosshead are oppositely clamped and fastened, the cable penetrates through the filling hole from the air cylinder and then is connected with the lifting ring nut, and therefore the whole crosshead is lifted. The cushion plate and the connecting plate of the cushion plate are arranged at the proper positions of the bottoms of the two sides of the lower portion of the crosshead to be assembled and connected into a whole, then the bottom faces of the two sides of the lower portion of the crosshead body including the connecting rod slowly descend to be located on the cushion plate of the cushion plate assembly so as to guarantee stability of the crosshead, and finally the crosshead pin is disassembled through the disassembling and assembling assembly. Therefore, the control gap and the center height of the crosshead can be guaranteed when the crosshead is disassembled and assembled, stability is kept, collision is prevented when the crosshead is disassembled and assembled, and working efficiency and safety of the crosshead are improved.

The utility model discloses a combined compressor which comprises a motor and further comprises a first-stage compressor body, a second-stage compressor body, a third-stage compressor body, a fourth-stage compressor body, a compressor body, a middle body, a compressor body, a connecting rod, a crosshead, a piston rod, a connecting cylinder, a pressure body B and a pressure body C. The power output end of the motor is provided with the first-stage compressor body, the second-stage compressor body, the third-stage compressor body and the fourth-stage compressor body through the compressor bodies. The machine body is composed of a middle body and a machine body, the device is of an eight-column eight-stage counter-dynamic balance type, air cylinder water cooling, pressure circulating lubrication and motor dragging, all columns of air cylinders are horizontally arranged and distributed on the two sides of a crankshaft, the device has the advantages of being good in dynamic balance performance, convenient to operate and overhaul and the like, the motor is of a dual-drive structure, four columns of compressor units are arranged on each side of the motor, the overall structure is optimized, and the service life is prolonged. The staggered angles of the cranks among the rows are reasonably arranged, the inherent frequency of a shaft system is changed, the torsional vibration of the shaft system can be effectively reduced, the jumping problem of the crankshaft is greatly relieved, and therefore vibration and noise of a unit are greatly reduced.

The high-precision piston rod connecting structure comprises a piston rod, the upper end of the piston rod is connected with a piston body, the lower end of the piston rod is connected with a crosshead, the upper end of the crosshead is connected with a positioning flange with a center hole, and the lower end of the piston rod is a reducing end transited through a conical surface section. The reducing end penetrates through the center hole of the positioning flange and is stretched and locked by a first fastening structure; the upper section of the center hole of the positioning flange is a taper hole matched with the conical surface section of the piston rod; the upper end of the piston rod penetrates into a center hole of the piston body, is stretched and locked by a second fastening structure and is provided with an anti-rotation structure. Automatic centering is achieved through conical surface matching, stable pre-tightening force is provided in cooperation with a double-fastening structure, the problems that a traditional connecting structure is insufficient in precision and poor in locking reliability are effectively solved, the operation precision and stability of a compressor are greatly improved, and meanwhile the compressor connecting structure has the advantages of being convenient to install and maintain and long in service life.

The utility model discloses a cooling device for a ball screw of an all-electric injection molding machine, which comprises the ball screw, one end of the ball screw is in threaded connection with a ball nut, the outer part of the ball nut is connected with a crosshead thrust seat, the middle part of the crosshead thrust seat is provided with a flow guide assembly, one side of the crosshead thrust seat is provided with a cooling assembly, and the other side of the crosshead thrust seat is provided with a water inlet and a water outlet. The output end of the cooling assembly is communicated with the flow guide assembly through a pipeline, after gas filtered by the gas source is treated by the vortex cooler, cooling gas is conveyed into the crosshead thrust seat through cooperation of a gas pipe and a gas pipe connector, a closed cavity formed by combining the crosshead thrust seat and the ball nut is filled with the cooling gas, and the crosshead thrust seat and the ball nut are sealed. The surface of the outer body of the ball nut is coated with the cooling gas, and the cooling gas with heat of the ball nut is exhausted through the exhaust pipeline and the silencer at the lower part of the crosshead thrust seat, so that the heat of the ball nut is taken away through continuous flowing of the cooling gas, the heat dissipation effect of the ball nut is improved, and the mold closing rate of the injection molding machine is increased.

A batch drum furnace with a dual cylinder is provided. In one embodiment, a batch drum furnace configured to heat a hot melt adhesive material includes a platen assembly configured to be movable from a raised position to a lowered position; a horizontal crosshead member which is suspended on the horizontal crosshead member; and a dual pneumatic piston assembly configured to move the platen assembly from the raised position to the lowered position. The pneumatic piston assembly includes a first pair of pneumatic pistons disposed on a first side of the drum furnace and a second pair of pneumatic pistons disposed on a second side of the drum furnace, and each pair of pneumatic pistons includes a first piston rod and a second piston rod, each piston rod having an upper end. In one embodiment, the upper end of the first piston rod is connected to the upper end of the second piston rod through first and second top connecting plates; and wherein the first and second top connecting plates are connected to opposite ends of the horizontal crosshead member by elongated crosshead struts.

The utility model relates to the technical field of plunger pumps, and discloses a fracturing plunger pump, a power end assembly of the fracturing plunger pump comprises a power end shell, a connecting rod body crosshead assembly and a crankshaft assembly, one side of the connecting rod body crosshead assembly is connected with a crankshaft of the crankshaft assembly, and the other side of the connecting rod body crosshead assembly is installed in a crosshead cavity of the power end shell; the power end shell comprises a plurality of crosshead cylinder sleeves, a plurality of crankshaft bearing pedestals and a plurality of vertical plates, the crankshaft bearing pedestals are installed on the vertical plates in a one-to-one correspondence mode, and a first containing cavity used for containing a crank throw of a crankshaft is formed between every two adjacent crankshaft bearing pedestals. A second containing cavity used for containing the crosshead cylinder sleeves is formed between every two adjacent vertical plates, each crosshead cylinder sleeve is provided with a crosshead cavity, and the crosshead cavities communicate with the first containing cavities. The reliability of the plunger pump can be improved through the vertical plates of the power end shell, the plunger pump is simple, reasonable and compact in overall structure, and light weight of the plunger pump is achieved.

A pump assembly may include a bearing housing having a bore. The pump assembly may include a connecting rod connected to the bearing housing at a first end of the connecting rod and connected to a crosshead at a second end of the connecting rod via a wrist pin. The connecting rod may include a lubrication channel that extends within the connecting rod. The pump assembly may include a shell bearing in the bore of the bearing housing, the shell bearing having an inner surface and an outer surface. A portion of the inner surface of the shell bearing that contacts the crankshaft in a forward stroke of the crosshead may be uninterrupted by a groove or an aperture configured to direct lubrication fluid to the lubrication channel of the connecting rod.

This application discloses a detection method and a detection device, relating to the field of reciprocating motion equipment. The detection method is applied to a plunger pump, the plunger pump including a detection device for detecting at least one of the temperature of certain components in the plunger pump and the lubricating oil pressure of the plunger pump. The detection method includes: detecting whether the plunger pump is in a working state; when the plunger pump is in a working state, the detection device switches to a temperature detection mode or a lubrication detection mode; when the plunger pump is not in a working state, the detection device switches to a sleep mode. This application can solve problems such as bearing failure caused by untimely temperature detection of the crosshead.

A preload bolt assembly for connecting at least two engine components of a large turbocharged two-stroke uniflow crosshead internal combustion engine is disclosed. [Solution] A preload bolt assembly for connecting at least two engine components (22, 23) of a large turbocharged two-stroke uniflow crosshead internal combustion engine comprises a tie rod (40) and a nut (42), the two engine components being connected by the tie rod and nut, with one end of the tie rod passing through a mounting hole (41) of the engine component and the nut screwed into the threads of the end. This preload bolt assembly is characterized by comprising a braking means disposed on the outer circumference of the tie rod to prevent the tie rod from moving through the mounting hole in the event of failure of the tie rod.

This invention provides a method for purging the fuel system of a large turbocharged two-stroke dual-fuel uniflow crosshead internal combustion engine. [Solution] The second fuel system comprises a second fuel tank, a second fuel supply line for supplying pressurized second fuel to a fuel valve, and a second fuel return line for returning pressurized second fuel from the fuel valve. The engine has a purge gas system for purging the second fuel from the fuel valve, the second fuel supply line, and the second fuel return line to a drain tank, wherein the method is characterized in that, after the purge is stopped, a space including at least a portion of the fuel valve and the second fuel supply and return line is isolated from the rest of the second fuel system by closing a plurality of valves, the internal pressure and temperature of the space are measured and used to determine whether the internal pressure of the space corresponds to the saturation pressure on the pressure / temperature saturation curve of the second fuel, and if the pressure in the space corresponds to the saturation pressure, the purge is continued.

The utility model relates to a mud pump crosshead upper and lower guide plate centering detection tool comprising a piston rod, the front end of the piston rod is provided with a piston installation segment, and the piston installation segment comprises a polished rod segment and a threaded segment; the mounting seat is arranged on the piston mounting section, and the mounting seat is rotationally arranged on the piston mounting section; the rear end of the bridge plate is fixedly connected with the mounting seat, and the bridge plate is parallel to the piston rod; one end of the sliding seat is connected with the bridge plates, and the bridge plates are in sliding fit with each other; and the dial indicator is installed on the sliding block, and the dial indicator is perpendicular to the bridge plate. The mud pump crosshead upper and lower guide plate centering gauge is simple in structure and low in manufacturing difficulty, can be quickly installed at the front end of a piston rod, and accurately measures the position accuracy of the piston rod in a reference hole.

A shaft generator system for use with a two-stroke uniflow scavenged crosshead type internal combustion engine is disclosed. The shaft generator system comprises a shaft generator, a first circuit for converting AC current from a first frequency to a second frequency, and a shaft generator control system configured to receive a first signal indicative of power consumption. The shaft generator control system is operatively connected to the shaft generator and configured to control power generation of the shaft generator based on the first signal. The shaft generator control system is configured to allow the power consumption to be different from the power generation for a first period of time of at least 2 seconds.

The invention relates to the technical field of compressors, in particular to a crosshead turnover device which comprises a center penetrating lever arranged on a crosshead in a penetrating mode. The piston side fixing assembly is arranged on the center penetrating lever in a sleeving mode and connected with the piston connecting end of the crosshead; the connecting rod side fixing assembly is arranged on the center penetrating bar in a sleeving manner and abuts against the inner side of the connecting rod connecting end of the crosshead; the two jacking assemblies are arranged on the outer side of the piston side fixing assembly and the outer side of the connecting rod side fixing assembly respectively, the bottoms of the two jacking assemblies abut against the sliding way where the crosshead is installed, and the upper ends of the two jacking assemblies are rotationally connected with the piston side fixing assembly and the connecting rod side fixing assembly respectively; in the turnover working condition, the jacking assembly jacks up the center penetrating rod and the crosshead arranged on the center penetrating rod so as to turn over the crosshead, and the problems that when an existing crosshead is replaced, the position of the crosshead in a sliding way is difficult to adjust, time and labor are wasted when the crosshead is turned over manually, the turnover difficulty is large, and a sliding shoe of the crosshead is prone to being damaged can be solved.

A split-type plunger pump includes: a first module including a reduction gearbox assembly, an input side interface thereof being connected to a power source; a second module including a crankcase assembly, an input side interface thereof being connected to an output side interface of the first module; a third module including a crosshead box assembly, an input side interface thereof being connected to an output side interface of the second module; and a fourth module including a fluid end assembly, an input side interface thereof being connected to an output side interface of the third module. The reduction gearbox assembly, the crankcase assembly, the crosshead box assembly, and the fluid end assembly are sequentially connected.

The utility model discloses a diaphragm pump for conveying ammonium phosphate slurry, which is characterized in that a driving motor is arranged on a cylinder body of the diaphragm pump, the driving motor is connected with a worm, the worm is connected with an eccentric wheel set, the eccentric wheel set is connected with a connecting rod through a crosshead, a plunger is arranged at the front end of the connecting rod, and the front end of the plunger is in non-contact connection with a diaphragm on an overflowing device. And the diaphragm is arranged in the middle of an overflowing pipeline in the overflowing mechanism. The plunger pump has the advantages that the diaphragm is in contact with a medium, corrosion and abrasion to the plunger caused by the direct contact mode of a traditional plunger pump and the medium are avoided, the operation cycle is prolonged, and the maintenance cycle is about one year. The maintenance cycle is prolonged, and the maintenance cost and the production cost are saved; 2, maintenance personnel are invested, the plunger pump is maintained by two persons on average, and the salary of each person is about 160000 yuan every year, and the salary of the maintenance personnel is about 160000 yuan every year; the diaphragm pump is only planned to be overhauled once every year and does not need to be maintained by a full-time maintainer; and 3, the safety risk and the environmental health risk are correspondingly reduced.

The utility model discloses an internal lubricating system of a five-cylinder drilling pump, which comprises a crankshaft lubricating oil pipeline, a bearing lubricating oil pipeline and a reduction gearbox lubricating oil pipeline which are connected with a lubricating oil tank through a lubricating oil pump and are respectively used for forcibly lubricating parts such as a connecting rod big end, a bearing, a crosshead, a cylinder sleeve and a speed reducer in the five-cylinder drilling pump. The five cylinder sleeves are each provided with a first cylinder sleeve oil return opening and a second cylinder sleeve oil return opening which are communicated with the pump shell bottom oil collecting groove, a pump shell bottom oil return opening is formed in the bottom of the pump shell bottom oil collecting groove, and the pump shell bottom oil return opening is connected with the second lubricating oil tank oil return opening through a pump shell oil return pipeline. A good lubricating system is established, it is guaranteed that all friction pairs are fully lubricated, lubricating oil cools parts in the backflow process, abrasion of the parts is reduced, the service life of equipment is prolonged, and the working efficiency of the five-cylinder drilling pump is improved.

A mold closing device (16) of an injection molding machine (10) is provided with a ball screw (26e) that is rotated by a motor (26a), a cross head (28) that is disposed between a rear platen (22) and a movable platen (24) and is moved in an axial direction of a connecting rod (34) by rotation of the ball screw, a toggle link (30) that moves the movable platen in the axial direction in accordance with movement of the cross head, and a cross head pressing mechanism (PM) that presses the cross head in a manner that the cross head is moved toward the rear platen side.

The invention discloses a steering engine device and a natural energy sensing platform, and the steering engine device comprises an electric push rod which serves as a power drive unit, has a power-off self-locking function, and is used for providing linear push-pull force; one end of the tiller is hinged to the electric push rod through a crosshead structure, and the other end of the tiller is connected with the rudder shaft and used for converting linear motion of the electric push rod into rudder angle rotation; the guide rail assembly comprises a first guide rail and a second guide rail which are symmetrically arranged and is used for restraining the movement track of the crosshead structure and providing lateral supporting force; the crosshead structure comprises a ball head, a front ball head seat and a rear ball head seat, the front ball head seat and the rear ball head seat are detachably connected, and the front ball head seat and the rear ball head seat are matched to clamp the ball head to form a sliding pair. And the antifriction system is arranged on a contact interface of the guide rail assembly and the crosshead structure and is used for reducing the friction resistance of the kinematic pair. The stress state of a traditional steering engine is fundamentally changed, the push rod only bears axial force, and abrasion of a kinematic pair is greatly reduced.