Wear-resistant towing seat

Abstract

The application provides a wear-resistant towing seat, which comprises a seat body and a towing seat panel hinged to the seat body, characterized in that two strip-shaped oil grooves are formed on the upper surface of the towing seat panel, an oil injection hole is arranged in the oil groove, an oil retaining cylinder is fixedly installed on the bottom surface of the towing seat panel, the oil retaining cylinder is communicated with the oil injection hole through a pipeline, so that the lubricating grease in the oil retaining cylinder is delivered to the oil groove, and an oil supply valve assembly for controlling the opening and closing of the pipeline is further connected to the pipeline; the oil groove is formed on the upper surface of the towing seat, and the oil injection time is adjusted according to the friction force between the contact surface of the towing seat and the trailer, when the friction force exceeds the set range, a certain amount of lubricating grease is automatically injected into the oil groove to reduce the friction.

Description

TECHNICAL FIELD

[0001] The present application relates to vehicle parts, a lubrication system on a towing seat, and in particular to a wear-resistant towing seat. BACKGROUND

[0002] The towing seat is usually installed on the chassis of a semitrailer and is engaged and locked with the towing pin of the trailer through a locking mechanism. The upper surface of the towing seat directly bears the pressure from the weight of the trailer. During vehicle driving, especially when turning, the friction between the upper surface of the towing seat and the lower surface of the connecting part of the trailer is extremely large.

[0003] In the prior art, a wear-resistant plate is usually installed on the upper surface of the towing seat and butter is regularly applied to improve wear resistance. For example, in the wear-resistant semitrailer towing seat disclosed in patent document CN213413431U, a wear-resistant plate composed of a wear-resistant layer and a pressure-resistant layer is installed to improve the wear resistance of the towing seat. In addition, some documents mention real-time oil injection to maintain the lubricity of the surface of the towing seat. For example, the oil injection system disclosed in patent document CN214822423U is composed of an oil port, an oil pipe, an oil groove, an air pump, and a piston. However, in view of the current prior art, manual application of butter is inconvenient due to the limitation of the operation space. On the other hand, it is necessary to consider how to control the timing and amount of butter injection to reduce butter consumption and prolong the maintenance cycle of the towing seat. SUMMARY

[0004] Based on the above technical status, the present application provides a wear-resistant towing seat. Oil grooves are formed on the upper surface of the towing seat. The timing of oil injection is adjusted according to the size of the friction between the contact surface of the towing seat and the trailer. When the friction exceeds a certain range, a certain amount of lubricating butter is automatically injected into the oil groove to reduce the friction.

[0005] The technical solution adopted by the present application is as follows: A wear-resistant towing seat comprises a seat body and a towing seat panel hinged to the seat body. The upper surface of the towing seat panel is provided with two strip-shaped oil grooves. An oil injection hole is arranged in each oil groove. A standing oil cylinder is fixedly installed on the bottom surface of the towing seat panel. The standing oil cylinder is connected to the oil injection hole through a pipeline to deliver lubricating oil in the standing oil cylinder to the oil groove. An oil supply valve assembly is further connected to the pipeline to control the opening and closing of the pipeline.

[0006] The upper surface of the towing seat panel is further provided with a pressure contact plate installation groove. A pressure contact plate that can slide left and right is installed in the pressure contact plate installation groove. A spring is arranged below the pressure contact plate. The pushing force of the spring makes the upper surface of the pressure contact plate slightly higher than the surface of the towing seat panel. After the trailer is installed, the pressure contact plate is pressed to be flush with the towing seat panel under the pressure of the trailer, thereby maintaining the contact friction between the pressure contact plate and the contact surface of the trailer.

[0007] The oil supply valve assembly is communicated with the oil reservoir through the oil supply pipe, the oil supply valve assembly is communicated with the oil injection hole through the oil supply pipe, and the end of the oil supply pipe is further provided with a one-way valve, so that the lubricating oil can only flow from the oil supply pipe to the oil tank. A mounting bracket is installed below the traction seat panel, which fixes and installs the oil supply valve assembly at the bottom of the traction seat panel. The oil supply valve assembly includes two parts symmetrically fixed on both sides of the mounting bracket, specifically including a first valve body, a first valve core, a first spring and a first adjusting nut on the same side, and a second valve body, a second valve core, a second spring and a second adjusting nut on the other side.

[0008] The first valve body is internally formed as a stepped portion, which divides the first valve body cavity into a large-diameter section valve cavity and a small-diameter section valve cavity in communication with each other. The open end of the large-diameter section valve cavity is closed by the mounting bracket, and the open end of the small-diameter section valve cavity is blocked by the first adjusting nut. The first valve core includes a first plug body installed in the large-diameter section valve cavity and a second plug body installed in the small-diameter section valve cavity, which are integrally connected by a connecting rod. The first spring is arranged between the first adjusting nut and the second plug body. The large-diameter section valve cavity side is provided with a first oil inlet communicated with the oil supply pipe, and the small-diameter section valve cavity side is provided with a first oil outlet communicated with the oil supply pipe. The first adjusting nut adjusts the pre-tightening force of the first spring through the depth of screwing.

[0009] The single body structure and assembly relationship between the second valve body, the second valve core, the second spring and the second adjusting nut are the same as those of the first valve body, the first valve core, the first spring and the first adjusting nut. The large-diameter section valve cavity of the second valve body is provided with a second oil inlet communicated with the oil supply pipe, and the small-diameter section valve cavity of the second valve body is provided with a second oil outlet communicated with the oil supply pipe. The second adjusting nut adjusts the pre-tightening force of the second spring through the depth of screwing.

[0010] The oil supply valve assembly further includes a drive column, both ends of which respectively extend into the first valve body and the second valve body and abut against the first valve core and the second valve core.

[0011] The middle part of the drive column has a radially arranged connecting bolt, the upper end of which is fixedly connected with the pressure contact plate. Specifically, a column structure perpendicular to the axial direction of the drive column is formed in the middle of the drive column, a stepped hole axially penetrating the column structure is formed in the column structure, and the connecting bolt is installed in the stepped hole. A stepped portion is formed on the outer periphery of the connecting bolt, which abuts against and is limited by the stepped surface of the stepped hole. A third adjusting nut is screwed on the bottom of the stepped hole, a third spring is arranged between the third adjusting nut and the connecting bolt, and the third spring pushes upward to make the stepped portion of the connecting bolt abut against the stepped surface of the stepped hole.

[0012] Further, the oil cylinder is composed of a cylinder body and a screw plug sealing both ends of the cylinder body, a piston and a pressurizing spring are arranged in the cylinder body, the pressurizing spring pushes the piston to move to provide pressure for conveying lubricating grease, and a filling port is arranged at one end of the cylinder body, which is used for supplementing lubricating grease in the oil cylinder through a pressure device during maintenance.

[0013] The traction seat of the present application is a double swing traction seat, wherein the seat body comprises two, a cross shaft is hinged between the two seat bodies, a radial through hole is arranged in the middle of the cross shaft, a center pin is arranged in the radial through hole, and the traction seat panel is hinged with the cross shaft through the center pin, so that the traction seat panel has double swing activity freedom degrees in left-right and front-back directions relative to the seat body.

[0014] The technical scheme of the present application has the advantages that: when the friction force exceeds the threshold value, the lubricating grease is automatically supplied to reduce the friction force on the surface of the traction disc, which can reduce the wear of the traction disc and effectively prolong the maintenance period; the lubricating grease is quantitatively and unidirectionally supplied through the oil supply valve assembly, which avoids the lubricating grease from flowing out all at once under pressure or flowing back to cause the lubricating grease to be unable to be supplemented to the surface of the traction disc, and the electronic driving device is not needed, so that the failure rate is basically zero. BRIEF DESCRIPTION OF DRAWINGS

[0015] Figure 1 is the overall structure of the traction seat of the present application Figure 1 ;

[0016] Figure 2 is the overall structure of the traction seat of the present application Figure 2 ;

[0017] Figure 3 is a structure schematic diagram of the self-lubricating oil supply system of the traction seat of the present application

[0018] Figure 4 is an exploded view of the oil supply valve assembly structure of the traction seat of the present application

[0019] Figure 5 is a sectional view of the oil supply valve assembly structure of the traction seat of the present application

[0020] Figure 6 is a sectional view of the driving column part structure of the traction seat of the present application

[0021] Figure 7 is a sectional view of the oil cylinder structure of the traction seat of the present application

[0022] Figure 8 is a detail view of the seat body mounting relationship of the traction seat of the present application

[0023] Figure 9 is a structure schematic diagram of the cross shaft of the traction seat of the present application

[0024] In the figure: 1, seat body, 2, towing seat panel, 3, oil groove, 4, oil injection hole, 5, oil retention cylinder, 6, pressure contact plate, 7, oil supply valve assembly, 8, oil delivery pipe, 9, oil supply pipe, 10, one-way valve, 11, first valve body, 12, first oil outlet, 13, first oil inlet, 14, first valve core, 15, first spring, 16, first adjusting nut, 17, second valve body, 18, second oil outlet, 19, second oil inlet, 20, second valve core, 21, second spring, 22, second adjusting nut, 23, drive column, 24, mounting bracket, 25, connecting bolt, 26, locking nut, 27, third spring, 28, third adjusting nut, 29, piston, 30, pressurizing spring, 31, screw plug, 32, filling port, 33, cross shaft, 34, center pin. DETAILED DESCRIPTION

[0025] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work fall within the scope of protection of the present application.

[0026] Referring to Figure 1 , Figure 2 , respectively, the overall structure of the towing seat of the present application Figure 1 and the overall structure Figure 2 , the main structure of the wear-resistant towing seat of the present application comprises a seat body 1 and a towing seat panel 2 hinged to the seat body 1. Different from the prior art, two strip-shaped oil grooves 3 are formed on the upper surface of the towing seat panel 2, an oil injection hole 4 is arranged in the oil groove 3, the oil injection hole 4 is in communication with a self-lubricating oil supply system installed at the bottom of the towing seat panel 2, the self-lubricating oil supply system supplies lubricating grease into the oil groove 3 from the oil injection hole 4, the lubricating grease extends along the oil groove 3 and diffuses between the contact surface of the towing seat panel 2 and the trailer, thereby playing a lubricating role, a pressure contact plate mounting groove is also formed on the upper surface of the towing seat panel 2, a left-right slidable pressure contact plate 6 is installed in the pressure contact plate mounting groove, and the upper surface of the pressure contact plate 6 is slightly higher than the surface of the towing seat panel 2, the surface of the pressure contact plate 6 is in contact with the contact surface of the trailer, when the vehicle turns, the friction between the contact surface of the trailer and the pressure contact plate 6 drives the pressure contact plate 6 to slide left and right, thereby driving the self-lubricating oil supply system to supply lubricating grease into the oil groove 3 through the pressure contact plate 6 to increase lubrication and reduce friction. Obviously, when the lubrication between the pressure contact plate 6 and the contact surface of the trailer is sufficient, the friction is not enough to drive the pressure contact plate 6 to slide left and right, and the self-lubricating oil supply system does not work.

[0027] Figure 3The self-lubricating oil supply system structure of the towing seat is shown in the figure, which comprises an oil supply valve assembly 7 and an oil reservoir 5, the oil supply valve assembly 7 and the oil reservoir 5 are communicated through an oil delivery pipe 8, the oil supply valve assembly 7 is communicated with an oil injection hole 4 through an oil supply pipe 9, and the end of the oil supply pipe 9 is further provided with a one-way valve 10, the one-way valve 10 functions to enable the lubricating grease to only flow from the oil supply pipe 9 to the oil groove 3, so as to prevent the lubricating grease from flowing back due to the pressure in the oil groove 3 between the surface of the towing seat and the contact surface of the trailer being too large, and to enable the lubricating grease to fully penetrate between the surface of the towing seat and the contact surface of the trailer.

[0028] In combination Figure 4 , Figure 5 Further description of the oil supply valve assembly of the present application, Figure 4 The oil supply valve assembly structure of the towing seat is shown in the figure, Figure 5 The oil supply valve assembly structure of the towing seat is shown in the figure, The oil supply valve assembly 7 comprises two symmetrical parts which are fixedly installed on a mounting bracket 24, the mounting bracket 24 fixes the oil supply valve assembly 7 on the bottom surface of the towing seat panel 2, and specifically comprises a first valve body 11, a first valve core 14, a first spring 15 and a first adjusting nut 16 on the same side, the first valve body 11 is internally formed with a stepped portion, the stepped portion divides the inner cavity of the first valve body 11 into a large-diameter valve cavity and a small-diameter valve cavity which are communicated with each other, the open end of the large-diameter valve cavity is closed by the mounting bracket 24, and the open end of the small-diameter valve cavity is blocked by the first adjusting nut 16, the first valve core 14 comprises a first plug body installed in the large-diameter valve cavity and a second plug body installed in the small-diameter valve cavity, the first plug body and the second plug body are integrally connected through a connecting rod, the first spring 15 is arranged between the first adjusting nut 16 and the second plug body, the pre-tightening force of the first spring 15 can be adjusted by adjusting the screwing depth of the first adjusting nut 16, a first oil inlet 13 is arranged on the side of the large-diameter valve cavity, the first oil inlet 13 is communicated with the oil delivery pipe 8, a first oil outlet 12 is arranged on the side of the small-diameter valve cavity, and the first oil outlet 12 is communicated with the oil supply pipe 9; the oil supply valve assembly 7 further comprises a second valve body 17, a second valve core 20, a second spring 21 and a second adjusting nut 22 which are symmetrically arranged on the other side of the mounting bracket 24, the monomer structure of the second valve body 17, the second valve core 20, the second spring 21 and the second adjusting nut 22 and the assembly relationship therebetween are the same as those of the first valve body 11, the first valve core 14, the first spring 15 and the first adjusting nut 16, a second oil inlet 19 is formed in the large-diameter valve cavity of the second valve body 17 and communicated with the oil delivery pipe 8, and a second oil outlet 18 is formed in the small-diameter valve cavity of the second valve body 17 and communicated with the oil supply pipe 9. Figure 5The oil supply valve assembly 7 also includes a drive column 23. The two ends of the drive column 23 extend into the first valve body 11 and the second valve body 17 respectively and abut against the first valve core 14 and the second valve core 20 respectively. When the drive column 23 slides left and right, it can drive the first valve body 11 or the second valve body 17 to move to complete the oil supply action.

[0029] The following is combined Figure 5 The working process of the fuel supply valve assembly 7 is described as follows: When the trailer turns to one side, it causes the pressure plate 6 to slide to one side, and the pressure plate 6 causes the drive column 23 to slide to one side, for example... Figure 5 As shown, the drive column 23 slides to the left, the first plug of the first valve core 14 blocks the first oil inlet 13, and the second plug of the first valve core 14 moves to the left to compress the first spring 15, opening the first oil outlet 12 located in the small-diameter section valve cavity. The lubricating grease between the first plug and the second plug of the first valve core 14 is supplied to the oil supply pipe 9 through the first oil outlet 12. On the right side of the oil supply valve assembly 7, the second spring 21 pushes the second valve core 20 to slide to the left (or the two ends of the drive column 23 are fixedly connected to the first valve core and the second valve core respectively, and the drive column 23 drives the second valve core 20 to move). The first plug of the second valve core 20 opens the second oil inlet 19, and the second plug of the second valve core 20 blocks the second oil outlet 18. The oil reservoir 5 The internal lubricating grease flows quantitatively through the oil supply pipe 8 into the large-diameter section of the valve cavity of the second valve body 17. The space formed by the first plug, the inner wall surface and step of the second valve body 17, and the rear end face of the second plug restricts the amount of lubricating grease flowing into the second valve body 17. When the vehicle straightens until it bends to the other side, the first plug of the second valve core 20 blocks the second oil inlet 19, and the second plug of the second valve core 20 opens the second oil outlet 18. Under the pushing action of the first plug, the lubricating grease inside the second valve body 17 is continuously supplied to the oil supply pipe 9 and then transported to the oil sump. At the same time, during the oil supply process of the right valve structure, the first valve core 14 moves to the right to open the first oil inlet 13 and accommodate a certain amount of lubricating grease.

[0030] The pressure plate 6 drives the drive column 23 to slide left and right via the connecting bolt 25. See details below. Figure 5 , Figure 5 , Figure 6is the drive column part structure sectional view of the towing seat of the present application, the middle part of the drive column 23 is provided with a mounting hole longitudinally through the drive column 23, specifically, the drive column 23 is formed with a column structure whose extension direction is perpendicular to the axial direction of the drive column, the mounting hole is formed in the column structure and penetrates through the column structure, the column structure cooperates with the flange structure on both sides of the mounting bracket 24 to limit the position, and the maximum range of the left and right sliding of the drive column 23 is limited. Further, the mounting hole is a stepped hole, the connecting bolt 25 is arranged in the mounting hole, the upper end of the connecting bolt 25 is locked and connected with the pressure contact plate 6 through a locking nut, and a stepped portion is formed on the outer circumferential part of the connecting bolt 25, which abuts against the stepped surface of the stepped hole to limit the upward outflow of the connecting bolt 25 from the mounting hole. The third adjusting nut 28 is screwed at the bottom of the mounting hole, the third spring 27 is arranged between the third adjusting nut 28 and the connecting bolt 25, and the initial elastic force of the third spring 27 can be adjusted by adjusting the screwing depth of the third adjusting nut 28, that is, the friction between the pressure contact plate 6 and the towing vehicle contact surface applied by the third spring 27 can be adjusted. In addition, when the drive column 23 is driven to slide to the left or to the right by the friction, the first spring 15 or the second spring 21 provides elastic resistance, when the elastic resistance of the first spring 15 or the second spring 21 is increased, the friction required to drive the drive column 23 to slide is greater, and the third spring 27 provides resistance to the downward pressure of the pressure contact plate 6, that is, the greater the initial elastic force of the third spring 27, the greater the friction between the pressure contact plate 6 and the towing vehicle contact surface. Therefore, the action threshold of the friction for driving the drive column 23 to move is comprehensively adjusted by the first spring, the second spring and the third spring, so that the self-lubricating oil supply system is used to transport lubricating grease to increase lubrication only when the friction between the towing seat and the towing vehicle contact surface is greater than a certain threshold, unnecessary waste of lubricating grease is avoided, and the maintenance period of the towing seat of the present application is prolonged.

[0031] Figure 6 is the oil cylinder structure sectional view of the towing seat of the present application, as shown in the figure, the oil cylinder 5 stores lubricating grease inside, which is composed of a cylinder body and a plug 31 sealing the both ends of the cylinder body, the cylinder body is provided with a piston 29 and a pressurizing spring 30, the pressurizing spring 30 pushes the piston 29 to move, and provides pressure for supplying lubricating grease to the oil supply pipe 8. A filling port 32 is arranged at one end of the cylinder body, and the filling port 32 is used to supplement lubricating grease into the oil cylinder 5 through a pressure device during maintenance.

[0032] Figure 7 is a detail view of the seat body mounting relationship of the towing seat of the present application, Figure 8It is the cross axle structure schematic diagram of the invention towing seat; seat body 1 includes two, both fixedly installed on the semitrailer chassis, the cross axle 33 is hinged between two seat bodies 1, the middle part of the cross axle 33 is provided with radial through hole, the radial through hole is provided with center pin 34, the towing seat panel 2 is hinged with cross axle 33 through center pin 34, so that the towing seat panel 2 has the double swing activity freedom degree of left and right and front and back directions relative to seat body 1. Figure 9 Figure 9 The cross axle 33 is composed of cross axle body, pin shaft and intermediate cylinder, relative to the process of first forging and then drilling hole in the cross axle of double swing towing seat, the cross axle 33 in the invention can reserve through hole in the middle part of cross axle body, then the cylinder is inserted into the through hole in the middle part and welded together, the center hole of the cylinder contains the center pin 34, the cylinder is used to play the role of strengthening the support of center pin, in addition, blind hole is arranged at both ends of cross axle body, then one end of pin shaft is inserted into blind hole and pin shaft is welded at the end of cross axle body, the mechanical properties of cross axle 33 formed by this structure is close to traditional cross axle, and can meet the performance requirements of towing seat parts, but the cost is reduced and the efficiency is improved.

[0033] Although the specific embodiments of the invention are described above with reference to the drawings, it is not a limitation on the protection scope of the invention, and those skilled in the art should understand that various equivalent structures or equivalent processes of modification or deformation can be made by those skilled in the art without creative labor on the basis of the technical solutions of the invention, or directly or indirectly applied to other related technical fields, still within the protection scope of the invention.

Claims

1. A wear-resistant traction seat comprising a seat body and a traction seat panel hinged to the seat body, characterized in that, The upper surface of the traction seat panel is provided with two strip-shaped oil grooves, the oil grooves are provided with oil injection holes, the bottom surface of the traction seat panel is fixedly provided with an oil retaining cylinder, the oil retaining cylinder is communicated with the oil injection holes through a pipeline to deliver the lubricating oil in the oil retaining cylinder to the oil grooves, and a lubricating oil supply valve assembly is further connected to the pipeline to control the opening and closing of the pipeline; The upper surface of the traction seat panel is further provided with a pressure contact plate mounting groove, a left-right slidable pressure contact plate is mounted in the pressure contact plate mounting groove, and a spring is arranged below the pressure contact plate, the pushing force of the spring makes the upper surface of the pressure contact plate slightly higher than the surface of the traction seat panel; The lubricating oil supply valve assembly is communicated with the oil retaining cylinder through an oil delivery pipe, the lubricating oil supply valve assembly is communicated with the oil injection hole through a lubricating oil supply pipe, and a one-way valve is further arranged at the end of the lubricating oil supply pipe to make the lubricating oil flow only from the lubricating oil supply pipe to the oil grooves; The lubricating oil supply valve assembly is fixedly mounted on the bottom of the traction seat panel through a mounting bracket, the lubricating oil supply valve assembly includes two parts symmetrically fixed on both sides of the mounting bracket, specifically including a first valve body, a first valve core, a first spring and a first adjusting nut on one side, and a second valve body, a second valve core, a second spring and a second adjusting nut on the other side; The first valve body is internally formed as a stepped portion, the stepped portion divides the first valve body into a large-diameter valve cavity and a small-diameter valve cavity which are in communication with each other, the open end of the large-diameter valve cavity is closed by the mounting bracket, the open end of the small-diameter valve cavity is closed by the first adjusting nut, the first valve core includes a first plug body mounted in the large-diameter valve cavity and a second plug body mounted in the small-diameter valve cavity, the first plug body and the second plug body are integrally connected through a connecting rod, the first spring is arranged between the first adjusting nut and the second plug body, a first oil inlet is arranged on the side of the large-diameter valve cavity and communicated with the oil delivery pipe, and a first oil outlet is arranged on the side of the small-diameter valve cavity and communicated with the lubricating oil supply pipe; The single body structure and the assembly relationship between the second valve body, the second valve core, the second spring and the second adjusting nut are the same as those of the first valve body, the first valve core, the first spring and the first adjusting nut, a second oil inlet is arranged on the large-diameter valve cavity of the second valve body and communicated with the oil delivery pipe, and a second oil outlet is arranged on the small-diameter valve cavity of the second valve body and communicated with the lubricating oil supply pipe; A driving column is further arranged, both ends of the driving column respectively extend into the first valve body and the second valve body and abut against the first valve core and the second valve core; The middle part of the driving column has a radially arranged connecting bolt, and the upper end of the connecting bolt is fixedly connected with the pressure contact plate.

2. The wear-resistant draftling according to claim 1, further characterized by, The first adjusting nut adjusts the pre-tightening force of the first spring through the screwing depth, and the second adjusting nut adjusts the pre-tightening force of the second spring through the screwing depth.

3. The wear-resistant draftling according to claim 1, further characterized by, A column structure perpendicular to the axial direction of the driving column is formed in the middle of the driving column, a stepped hole axially penetrating through the column structure is formed in the column structure, and the connecting bolt is mounted in the stepped hole. The connecting bolt outer peripheral part is formed with a step part, the step part is limited by the step surface of the step hole, the bottom of the step hole is screwed with a third adjusting nut, a third spring is arranged between the third adjusting nut and the connecting bolt, and the third spring pushes the step part of the connecting bolt to abut on the step surface of the step hole.

4. The wear-resistant draft seat of claim 1, further characterized by, The oil retaining cylinder is composed of a cylinder body and a screw plug sealing the two ends of the cylinder body, a piston and a pressurizing spring are arranged in the cylinder body, the pressurizing spring pushes the piston to move to provide pressure for conveying lubricating grease.

5. The wear-resistant draftling according to claim 1, further characterized by, The seat body includes two, two seat bodies are hinged with a cross shaft, a radial through hole is arranged in the middle part of the cross shaft, a center pin is arranged in the radial through hole, and the traction seat panel is hinged with the cross shaft through the center pin.

6. The wear-resistant draft seat of claim 5, further characterized by The cross shaft is composed of a cross shaft body, a pin shaft and an intermediate cylinder, the cylinder penetrates into the radial through hole and is welded and fixed with the cross shaft body, the center pin is accommodated in the center hole of the cylinder, and the two ends of the cross shaft body are respectively provided with a blind hole, two pin shafts are respectively inserted into one blind hole and are welded and fixed with the cross shaft body.

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