Primer coating skid fulcrum and processing method thereof

Abstract

The invention relates to a skid fulcrum coated with primer and a processing method of the skid fulcrum. The fulcrum comprises a fulcrum mounting block part, an inner rotating half pin part, an outer rotating half pin part, a limiting rotating disc part and an elastic piece part. The fulcrum mounting block part consists of a fulcrum mounting plate, a fulcrum reinforcing plate, a rotating pin mounting block and a shifting reed mounting plate; the inner rotating half pin part consists of a locking fulcrum and an inner rotating half pin; the outer rotating half pin part is composed of a locking fulcrum and an outer rotating half pin. When positioning holes of a vehicle body penetrate through an inner group of positioning pins and an outer group of positioning pins, the inner rotating pin and the outer rotating pin penetrate through the holes under the action of gravity and deflect towards the two sides respectively after penetrating through the holes, self-locking is achieved, the use range is wide, and compatibility is good; the machined parts are subjected to heat treatment and machining and enter the assembly procedure, the precision of all the parts is high, internal stress is completely released, the consistency of finished products is good, and all the components can be flexibly interchanged; and the matching surfaces of all the parts are subjected to thermal refining, so that the hardness and the wear resistance are improved.

Description

Technical Field

[0001] The invention belongs to the technical field of automobiles, and in particular relates to a primer-coated skid fulcrum and a processing method thereof. Background Art

[0002] At present, the primer lines in the paint shops of some vehicle manufacturers, generally referring to pre-treatment, electrophoresis and electrophoresis drying, require the conveying sled to be locked with the body in white, and the sled is used to carry the body for process implementation. In the process of locking the sled and the body, a locking device must be used to lock the sled and the body. When the locking device fails, the sled and the body cannot be locked automatically, which can easily cause the body to fall out. Summary of the invention

[0003] The purpose of the present invention is to provide a partially self-locking paint primer sled fulcrum structure and a processing and manufacturing method thereof, so as to solve the problem of locking the sled and the vehicle body.

[0004] The objective of the present invention is achieved through the following technical solutions:

[0005] A primer-coated skid fulcrum includes a fulcrum mounting block portion, an inner rotating half pin portion, and an outer rotating half pin portion;

[0006] The fulcrum mounting block is composed of a fulcrum mounting plate 1, a fulcrum reinforcement plate 2, a rotating pin mounting block 3 and a spring plate mounting plate 13; the rotating pin mounting block 3 is connected to the fulcrum mounting plate 1, and the fulcrum reinforcement plate 2 is connected between the rotating pin mounting block 3 and the fulcrum mounting plate 1; the spring plate mounting plate 13 is connected to one side of the rear portion of the limiting rotating disk mounting boss;

[0007] The inner rotating half pin part is composed of a locking fulcrum 4 and an inner rotating half pin 5; the locking fulcrum 4 is a lower semi-cylinder, a middle semi-cylinder and a cut truncated cone, and an upper semi-conical structure, and the lower part is provided with two threaded holes for mounting the locking fulcrum 4 on the inner rotating half pin 5, and a truncated cone is cut between the upper surface of the lower semi-cylinder and the upper semi-conical structure; the inner rotating half pin 5 is a heterogeneous structure, and the upper part is provided with a mounting hole for the locking fulcrum 4 and a bolt through hole for fixing the bolt, the middle part is provided with a through hole for the inner rotating half pin fixing shaft 6, and the lower part is provided with a rotation limiting shaft;

[0008] The outer rotating half pin part is composed of a locking fulcrum 4 and an outer rotating half pin 7; the outer rotating half pin 7 is a heterogeneous structure, with a mounting hole for the locking fulcrum 4 and a bolt through hole for the fixing bolt at the upper part, a through hole for the outer rotating half pin fixing shaft 8 at the middle part, and a rotation limiting shaft at the lower part;

[0009] The limiting rotating disk fixing pin 9 passes through the through hole in the middle of the limiting rotating disk 10, and further passes through the limiting rotating disk mounting boss on the rotating pin mounting block 3, and fixes the limiting rotating disk 10 on the rotating pin mounting block 3, and passes the rising pin through the through hole at the far end of the rotating pin mounting block 3 and the limiting rotating disk fixing pin 9 to achieve fixation; the limiting rotating disk fixing cover 11 passes through the outer side of the limiting rotating disk fixing pin 9, and passes the rising pin through the rising pin through hole of the limiting rotating disk fixing cover 11 and the limiting rotating disk fixing pin 9;

[0010] The torsion spring 12 is fixed to the torsion spring mounting plate 13, and the other end thereof is pressed against the limiting rotating disk 10 and fastened by bolts.

[0011] Furthermore, the rotating pin mounting block 3 is fully welded to the fulcrum mounting plate 1, the rear plane of the rotating pin mounting block 3 is perpendicular to the fulcrum mounting plate 1, and the fulcrum reinforcement plate 2 is welded between the rotating pin mounting block 3 and the fulcrum mounting plate 1, and is fully welded for connection.

[0012] Furthermore, three bosses of different heights are arranged on the rotating pin mounting block 3, namely, an inner rotating pin mounting boss, an outer rotating pin mounting boss and a limiting rotating disk mounting boss; the boss is a hollow cylindrical structure with a cross groove arranged on the surface, and a through hole for the pin is arranged on the upper side of the boss.

[0013] Furthermore, the torsion spring installation plate 13 is welded to one side of the rear portion of the limiting rotating disk installation boss, and is provided with two parallel through holes for installing the torsion spring.

[0014] Furthermore, the locking fulcrum 4 is fixed to the inner rotating half pin with double bolts; the inner rotating half pin fixing shaft 6 passes through the fixing shaft in the middle of the inner rotating half pin 5, and further passes through the inner rotating pin mounting boss on the rotating pin mounting block 3, and the expanding pin is passed through the expanding pin through hole in the upper part of the inner rotating pin mounting boss and the middle part of the inner rotating half pin fixing shaft 6 to complete the fixation of the inner rotating half pin 5; one section of the inner rotating half pin fixing shaft 6 is a triangular boss, and the other side of the triangular boss is a solid cylinder, and a pin fixing through hole is arranged in the middle.

[0015] Furthermore, the locking fulcrum 4 and the outer rotating half pin 7 are fixed with double bolts.

[0016] Furthermore, the outer rotating half pin fixing shaft 8 passes through the fixing shaft in the middle of the outer rotating half pin 7, and further passes through the outer rotating pin mounting boss on the rotating pin mounting block 3, and the pin is passed through the pin-raising through hole in the upper part of the inner rotating pin mounting boss and the middle part of the outer rotating half pin fixing shaft 8 to complete the fixing of the outer rotating half pin. One section of the outer rotating half pin fixing shaft 8 is a triangular boss, and the other side of the triangular boss is a solid cylinder, with a pin-raising fixing through hole set in the middle.

[0017] Furthermore, a through hole for the rotating shaft is arranged in the middle of the position-limiting rotating disk 10, and special-shaped oblong holes are arranged at the upper left and lower right respectively, and the rotating limiting axis of the inner rotating half pin 5 and the rotating limiting axis of the outer rotating half pin 7 are respectively passed through the special-shaped oblong holes, so as to achieve the purpose of limiting the position of the inner rotating half pin 5 and the outer rotating half pin 7 and their common movement.

[0018] Furthermore, the main body of the limiting rotating disk fixing pin 9 is a cylindrical structure, one end of which is a triangular boss, and two pin-opening through holes are arranged in the middle; the limiting rotating disk fixing cover 11 is a cylindrical structure, the inner side of which is provided with a cross groove, and the upper end is provided with a pin-opening through hole.

[0019] A method for processing a primer-coated skid fulcrum comprises the following steps:

[0020] A. Cutting: Laser cutting equipment is used for cutting. The cutting of steel plates and cylindrical bars are all done by laser cutting.

[0021] B. Welding: Weld the cut plates and bars together. The welding method is argon arc welding, and the weld joint is fully welded.

[0022] C. Heat treatment: send the welded assembly into the heat treatment furnace, use a special hanger to hang all the parts in the air, use an electric heating furnace for heat treatment, heat all the parts from room temperature to 500-550℃, and the temperature rise shall not exceed 100℃ per hour; keep warm for 8h after heating, then stop heating, and keep in the furnace to cool down to room temperature; Heat treatment: send the reed into the heat treatment furnace, use a special hanger to hang all the parts in the air, use an electric heating furnace for heat treatment, heat all the parts from room temperature to 850-890℃, and the temperature rise shall not exceed 100℃ per hour; quench after heating, use oil cooling; temper after quenching, the temperature is 450-510℃, keep warm for 8h, and then cool down to room temperature naturally;

[0023] D. Correction: Correct the welded parts. The correction method is: use a small flame of oxyacetylene to heat the deformed part of the protrusion, wait for the protrusion to gradually recover from deformation, extinguish the oxyacetylene flame, and immediately spray water to cool the heated part. Repeat 4 times;

[0024] E. Machining: Place the parts into a CNC lathe for machining;

[0025] F. Quenching and tempering treatment: The mounting surface and matching surface of the parts are quenched and tempered. The quenching and tempering method is: use an electric heating furnace to heat the workpiece to 840℃, take it out after the heating is completed, and quench it with water cooling; after quenching, temper it at 600℃, keep it warm for 30 minutes, and cool it naturally after the holding time is up; the surface hardness of the quenched and tempered workpiece should reach at least HRC45;

[0026] G. Surface cleaning: Use metal parts cleaning agent to clean and wipe;

[0027] H. Assembly: Assemble according to the assembly drawing.

[0028] Compared with the prior art, the present invention has the following beneficial effects:

[0029] 1. The coating primer sled fulcrum of the present invention can realize the self-locking function: when the positioning hole (steel plate with hole) of the vehicle body passes through the inner and outer sets of positioning pins, the inner and outer rotating pins will pass through the hole due to gravity, and deflect to both sides respectively after passing through the hole to realize self-locking. This structure can be extended to other devices that need to be locked, with wide application and good compatibility;

[0030] 2. After heat treatment and machining, the workpiece enters the assembly process. Each component has high precision, the internal stress is completely released, the finished product has good consistency, and each component can be flexibly interchanged;

[0031] 3. The mating surfaces of all components have been tempered to improve their hardness and wear resistance. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for use in the embodiments are briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present invention and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without creative work.

[0033] Figure 1 A schematic diagram of the three-dimensional structure of the primer skid fulcrum of the present invention.

[0034] In the figure: 1. Fulcrum mounting plate 2. Fulcrum reinforcement plate 3. Rotation pin mounting block 4. Locking fulcrum 5. Inner rotating half pin 6. Inner rotating half pin fixed shaft 7. Outer rotating half pin 8. Outer rotating half pin fixed shaft 9. Position limiting rotating disk fixing pin 10. Position limiting rotating disk 11. Position limiting rotating disk fixing cover 12. Activating spring 13. Activating spring mounting plate. DETAILED DESCRIPTION

[0035] The present invention will be further described below in conjunction with embodiments:

[0036] like Figure 1 As shown, the primer sled fulcrum of the present invention comprises a fulcrum mounting block portion, an inner rotating half pin portion, an outer rotating half pin portion, a limiting rotating disk portion and an elastic sheet portion.

[0037] The fulcrum mounting block is composed of a fulcrum mounting plate 1, a fulcrum reinforcement plate 2, a rotation pin mounting block 3 and a spring plate mounting plate 13. The rotation pin mounting block 3 is fully welded to the fulcrum mounting plate 1, the rear plane of the rotation pin mounting block 3 is perpendicular to the fulcrum mounting plate 1, and the fulcrum reinforcement plate 2 is welded between the rotation pin mounting block 3 and the fulcrum mounting plate 1, and is fully welded for connection.

[0038] The rotating pin mounting block 3 is provided with three bosses of different heights, namely, an inner rotating pin mounting boss, an outer rotating pin mounting boss and a limited rotating disk mounting boss. The boss is a hollow cylindrical structure with a cross groove on the surface, and a through hole for the pin is provided on the upper side of the boss.

[0039] The torsion spring installation plate 13 is welded to one side of the rear portion of the limiting rotating disk installation boss, and is provided with two parallel through holes for installing the torsion spring.

[0040] The inner rotating half pin part is composed of a locking fulcrum 4 and an inner rotating half pin 5. The locking fulcrum 4 is a lower semi-cylinder, a middle semi-cylinder and a cut truncated cone, and an upper semi-conical structure. The lower part is provided with two threaded holes for mounting the locking fulcrum 4 on the inner rotating half pin 5. The cut truncated cone between the upper surface of the lower semi-cylinder and the upper semi-conical structure plays the role of the locking fulcrum hole surface. The inner rotating half pin 5 is a heterogeneous structure, with a mounting hole for the locking fulcrum 4 and a bolt through hole for the fixing bolt at the upper part, a through hole for the inner rotating half pin fixing shaft 6 at the middle part, and a rotation limiting shaft at the lower part.

[0041] Specifically, the locking fulcrum 4 and the inner rotating half pin 5 are assembled together and fixed with double bolts.

[0042] Specifically, the inner rotating half pin fixing shaft 6 passes through the fixing shaft in the middle of the inner rotating half pin 5, and further passes through the inner rotating pin mounting boss on the rotating pin mounting block 3, and the pin is passed through the pin mounting through hole in the upper part of the inner rotating pin mounting boss and the middle part of the inner rotating half pin fixing shaft 6 to complete the fixing of the inner rotating half pin 5. One section of the inner rotating half pin fixing shaft 6 is a triangular boss, and the other side of the triangular boss is a solid cylinder, with a pin mounting through hole in the middle.

[0043] The outer rotating half pin part is composed of a locking fulcrum 4 and an outer rotating half pin 7. The outer rotating half pin 7 is a heterogeneous structure, with a mounting hole for the locking fulcrum 4 and a bolt through hole for a fixing bolt at the upper part, a through hole for an outer rotating half pin fixing shaft 8 at the middle part, and a rotation limiting shaft at the lower part.

[0044] Specifically, the locking fulcrum 4 and the outer rotating half pin 7 are assembled together and fixed with double bolts.

[0045] Specifically, the outer rotating half pin fixing shaft 8 passes through the fixing shaft in the middle of the outer rotating half pin 7, and further passes through the outer rotating pin mounting boss on the rotating pin mounting block 3, and the pin is passed through the pin mounting through hole in the upper part of the inner rotating pin mounting boss and the middle part of the outer rotating half pin fixing shaft 8 to complete the fixing of the outer rotating half pin. One section of the outer rotating half pin fixing shaft 8 is a triangular boss, and the other side of the triangular boss is a solid cylinder, with a pin mounting through hole in the middle.

[0046] Specifically, the position-limiting rotating disk fixing pin 9 is passed through the through hole in the middle of the position-limiting rotating disk 10, and further passed through the position-limiting rotating disk mounting boss on the rotating pin mounting block 3, the position-limiting rotating disk 10 is fixed on the rotating pin mounting block 3, and the rising pin is passed through the through hole at the far end of the rotating pin mounting block 3 and the position-limiting rotating disk fixing pin 9 to achieve fixation; the position-limiting rotating disk fixing cover 11 is passed through the outside of the position-limiting rotating disk fixing pin 9, and the rising pin is passed through the position-limiting rotating disk fixing cover 11 and the rising pin through hole of the position-limiting rotating disk fixing pin 9. A through hole for the rotating axis is set in the middle of the position-limiting rotating disk 10, and special-shaped oblong holes are set in the upper left and lower right respectively, and the rotation limiting axis of the inner rotating half pin 5 and the rotation limiting axis of the outer rotating half pin 7 are respectively passed through the special-shaped oblong holes, so as to achieve the purpose of limiting the position of the inner rotating half pin 5 and the outer rotating half pin 7 and the purpose of common movement. The main body of the position-limiting rotating disk fixing pin 9 is a cylindrical structure, one end of which is a triangular boss, and two rising pin through holes are set in the middle. The position-limiting rotating disk fixing cover 11 is a cylindrical structure, with a cross groove arranged on the inner side and a pin-opening through hole arranged on the upper end.

[0047] Specifically, the torsion spring 12 is fixed on the torsion spring mounting plate 13, and the other end is pressed tightly against the limiting rotating disk 10, and is fastened with bolts to complete the assembly of the fulcrum.

[0048] To achieve: a method for processing a primer-coated sled fulcrum, comprising the following steps:

[0049] (1) Cutting: Laser cutting equipment is used for cutting. The cutting of steel plates and cylindrical bars are all laser cutting.

[0050] (2) Welding: Weld the cut plates and bars together. The welding method is argon arc welding with full weld.

[0051] (3) Heat treatment (non-elastic parts): send the welded assembly into the heat treatment furnace, use a special hanger to hang all the parts in the air, use an electric heating furnace for heat treatment, heat all the parts from room temperature to 500-550℃, and the temperature shall not exceed 100℃ per hour; after the heating is completed, keep it warm for 8 hours, then stop heating, and keep it in the furnace to cool down to room temperature; Heat treatment (spring sheet): send the spring sheet into the heat treatment furnace, use a special hanger to hang all the parts in the air, use an electric heating furnace for heat treatment, heat all the parts from room temperature to 850-890℃, and the temperature shall not exceed 100℃ per hour; after the heating is completed, quench it with oil cooling; after quenching, temper it at a temperature of 450-510℃, keep it warm for 8 hours, and then cool it down to room temperature naturally;

[0052] (4) Correction: Correct the weldment by using a small flame of oxyacetylene to heat the deformed part of the protrusion. After the protrusion gradually recovers from the deformation, extinguish the oxyacetylene flame and immediately spray water to cool the heated part. Repeat this process 4 times.

[0053] (5) Machining: Place the parts on a CNC lathe for machining;

[0054] (6) Quenching and tempering treatment: The mounting surface and mating surface of the component are quenched and tempered. The quenching and tempering method is as follows: the workpiece is heated to 840°C in an electric heating furnace, taken out after the heating is completed, and quenched by water cooling; after quenching, tempering treatment is performed at a tempering temperature of 600°C for 30 minutes, and then naturally cooled after the holding time is up; the surface hardness of the quenched and tempered workpiece reaches at least HRC45;

[0055] (7) Surface cleaning: Use metal parts cleaning agent to clean and wipe;

[0056] (8) Assembly: Assemble according to the assembly drawing.

[0057] Embodiment 1 A method for processing a sled fulcrum for coating a primer comprises the following steps:

[0058] 1. Cutting: Laser cutting equipment is used for cutting. When cutting, all the same parts are cut from the same steel plate or cylindrical steel bar. The outer contour of the parts after laser cutting is consistent with the outer contour of the drawing, with an overall deviation of ±0.5mm;

[0059] 2. Welding: First, design the welding jig. The jig should ensure that there are multiple sets of precision positioning holes and positioning limit blocks. The welded assembly should be disassembled. After the jig is completed, weld the assembly 1: 1- jig mounting plate, 2- fulcrum reinforcement plate, 3- rotating pin mounting block, 13- reed plate mounting plate together to obtain the welded assembly: fulcrum mounting seat assembly; Assembly 2: weld the rotating half pin and the rotating limiting shaft together to obtain 5- inner rotating half pin, 7- outer rotating half pin assembly;

[0060] 3. Heat treatment: (1) Non-elastic parts (except 12-reed plate): Place the welded assembly into a heat treatment furnace, hang all parts in the air using a special hanger, and use an electric furnace for heat treatment. All parts are heated from room temperature to 550±20℃, with a temperature increase of no more than 100℃ per hour; after heating, keep warm for 8 hours, then stop heating and open the furnace door, and let the workpiece stay in the furnace to cool naturally to room temperature; (2) Reed plate: Place the reed plate into a heat treatment furnace, hang all parts in the air using a special hanger, and use an electric furnace for heat treatment. All parts are heated from room temperature to 850-890℃, with a temperature increase of no more than 100℃ per hour; after heating, quench with oil cooling; after quenching, temper at 450-510℃, keep warm for 8 hours, and then cool naturally to room temperature;

[0061] 4. Machining: Place the parts on a CNC lathe for machining. The machining range includes: all mounting surfaces, matching holes, matching shafts, etc. The machining accuracy is: overall ±0.5mm;

[0062] 5. Quenching and tempering treatment: The mounting surface and matching surface of the parts are quenched and tempered. The quenching and tempering method is: use an electric heating furnace to heat the workpiece to 840℃, take it out after heating, and quench it with water cooling; after quenching, temper it at 600℃ for 30 minutes. After the insulation time is up, open the furnace door and cool it naturally; the surface hardness of the quenched and tempered workpiece should reach at least HRC45;

[0063] 6. Surface cleaning: Use metal parts cleaning agent to clean and wipe the surface of the workpiece;

[0064] 7. Assembly: Assemble according to the assembly drawing.

[0065] The fulcrum coating primer slide of the present invention is composed of a fulcrum mounting block part, an inner rotating half pin part, an outer rotating half pin part, a limit rotating disk part, and an elastic sheet part. All moving parts can maintain linkage, and can achieve a certain degree of self-locking without the assistance of external equipment. In the present invention, the locking component is divided into two points for fixing: an inner rotating half pin and an outer rotating half pin, which together realize the positioning and locking of the hole. In the present invention, the workpiece is heat treated, machined and enters the assembly process. Each component has high precision, the internal stress is completely released, the finished product has good consistency, and each component can be flexibly interchanged. The mating surfaces of each component have been tempered, and the hardness and wear resistance have been improved.

[0066] Note that the above are only preferred embodiments of the present invention and the technical principles used. Those skilled in the art will understand that the present invention is not limited to the specific embodiments described herein, and that various obvious changes, readjustments and substitutions can be made by those skilled in the art without departing from the scope of protection of the present invention. Therefore, although the present invention has been described in more detail through the above embodiments, the present invention is not limited to the above embodiments, and may include more other equivalent embodiments without departing from the concept of the present invention, and the scope of the present invention is determined by the scope of the appended claims.

Claims

1. A coating primer sled fulcrum, characterized in that: It includes a fulcrum mounting block part, an inner rotating half pin part and an outer rotating half pin part; The fulcrum mounting block part is composed of a fulcrum mounting plate (1), a fulcrum reinforcement plate (2), a rotating pin mounting block (3) and a spring plate mounting plate (13); the rotating pin mounting block (3) is connected to the fulcrum mounting plate (1), the fulcrum reinforcement plate (2) is connected between the rotating pin mounting block (3) and the fulcrum mounting plate (1); the spring plate mounting plate (13) is connected to one side of the rear portion of the limiting rotating disk mounting boss; The inner rotating half pin part is composed of a locking fulcrum (4) and an inner rotating half pin (5); the locking fulcrum (4) is a lower semi-cylinder, a middle semi-cylinder and a cut truncated cone, and an upper semi-conical structure, the lower part is provided with two threaded holes for mounting the locking fulcrum (4) on the inner rotating half pin (5), and a cut truncated cone is formed between the upper surface of the lower semi-cylinder and the upper semi-conical structure; the inner rotating half pin (5) is a heterogeneous structure, the upper part is provided with a mounting hole for the locking fulcrum (4) and a bolt through hole for fixing the bolt, the middle part is provided with a through hole for the inner rotating half pin fixing shaft (6), and the lower part is provided with a rotation limiting shaft; The outer rotating half pin part is composed of a locking fulcrum (4) and an outer rotating half pin (7); the outer rotating half pin (7) is a heterogeneous structure, with a mounting hole for the locking fulcrum (4) and a bolt through hole for a fixing bolt provided at the upper part, a through hole for an outer rotating half pin fixing shaft (8) provided at the middle part, and a rotation limiting shaft provided at the lower part; The limiting rotating disk fixing pin (9) passes through the through hole in the middle of the limiting rotating disk (10), and further passes through the limiting rotating disk mounting boss on the rotating pin mounting block (3), so as to fix the limiting rotating disk (10) on the rotating pin mounting block (3), and the rising pin passes through the through hole at the far end of the rotating pin mounting block (3) and the limiting rotating disk fixing pin (9) to achieve fixation; the limiting rotating disk fixing cover (11) passes through the outside of the limiting rotating disk fixing pin (9), and the rising pin passes through the rising pin through hole of the limiting rotating disk fixing cover (11) and the limiting rotating disk fixing pin (9); The torsion spring (12) is fixed to the torsion spring installation plate (13), and the other end thereof is pressed against the limiting rotating disk (10) and fastened by bolts.

2. A primer skid fulcrum according to claim 1, characterized in that: The rotating pin mounting block (3) and the fulcrum mounting plate (1) are fully welded, the rear plane of the rotating pin mounting block (3) is perpendicular to the fulcrum mounting plate (1), and the fulcrum reinforcement plate (2) is welded between the rotating pin mounting block (3) and the fulcrum mounting plate (1) to achieve full welding connection.

3. A primer skid fulcrum according to claim 1, characterized in that: The rotating pin mounting block (3) is provided with three bosses of different heights, namely an inner rotating pin mounting boss, an outer rotating pin mounting boss and a limit rotating disk mounting boss; the boss is a hollow cylindrical structure with a cross groove on the surface, and a through hole for the pin is provided on the upper side of the boss.

4. A primer skid fulcrum according to claim 1, characterized in that: The torsion spring installation plate (13) is welded to one side of the rear portion of the limiting rotating disk installation boss, and is provided with two parallel through holes for installing the torsion spring.

5. A primer skid fulcrum according to claim 1, characterized in that: The locking fulcrum (4) is fixed to the inner rotating half pin with double bolts; the inner rotating half pin fixing shaft (6) passes through the fixing shaft in the middle of the inner rotating half pin (5), and further passes through the inner rotating pin mounting boss on the rotating pin mounting block (3), and the expansion pin is passed through the expansion pin through hole in the upper part of the inner rotating pin mounting boss and the middle part of the inner rotating half pin fixing shaft (6), so as to complete the fixation of the inner rotating half pin (5); one section of the inner rotating half pin fixing shaft (6) is a triangular boss, and the other side of the triangular boss is a solid cylinder, and a expansion pin fixing through hole is arranged in the middle.

6. A primer skid fulcrum according to claim 1, characterized in that: The locking fulcrum (4) and the outer rotating half pin (7) are fixed by double bolts.

7. A primer skid fulcrum according to claim 1, characterized in that: The outer rotating half pin fixing shaft (8) passes through the fixing shaft in the middle of the outer rotating half pin (7), and further passes through the outer rotating pin mounting boss on the rotating pin mounting block (3), and the pin is passed through the pin mounting through hole in the upper part of the inner rotating pin mounting boss and the middle part of the outer rotating half pin fixing shaft (8), so as to complete the fixing of the outer rotating half pin. One section of the outer rotating half pin fixing shaft 8 is a triangular boss, and the other side of the triangular boss is a solid cylinder, and a pin mounting through hole is arranged in the middle.

8. The primer skid fulcrum according to claim 1, characterized in that: A through hole for the rotating shaft is arranged in the middle of the position-limiting rotating disk 10, and irregular long circular holes are arranged at the upper left and lower right, respectively, through which the rotating limiting shaft of the inner rotating half pin (5) and the rotating limiting shaft of the outer rotating half pin (7) are respectively passed, so as to achieve the purpose of limiting the position of the inner rotating half pin (5) and the outer rotating half pin (7) and their joint movement.

9. The primer skid fulcrum according to claim 1, characterized in that: The main body of the limit rotating disk fixing pin (9) is a cylindrical structure, one end of which is a triangular boss, and two pin-opening through holes are arranged in the middle; the limit rotating disk fixing cover (11) is a cylindrical structure, the inner side of which is provided with a cross groove, and the upper end is provided with a pin-opening through hole.

10. A method for processing a sled fulcrum for coating a primer, characterized in that: The following steps are involved: A. Cutting: Laser cutting equipment is used for cutting. The cutting of steel plates and cylindrical bars are all done by laser cutting. B. Welding: Weld the cut plates and bars together. The welding method is argon arc welding, and the weld joint is fully welded. C. Heat treatment: Send the welded assembly into the heat treatment furnace, use a special hanger to hang all the parts in the air, and use an electric heating furnace for heat treatment. All parts are heated from room temperature to 500-550℃, and the temperature rise does not exceed 100℃ per hour; after the heating is completed, keep the temperature for 8 hours, then stop heating, and stay in the furnace to cool down to room temperature; Heat treatment: put the reed into the heat treatment furnace, use a special hanger to hang all the parts in the air, use an electric heating furnace for heat treatment, heat all the parts from room temperature to 850-890℃, and the temperature rise shall not exceed 100℃ per hour; after the heating is completed, quench with oil cooling; after quenching, temper at 450-510℃, keep warm for 8 hours and then cool naturally to room temperature; D. Correction: Correct the welded parts. The correction method is: use a small flame of oxyacetylene to heat the deformed part of the protrusion, wait for the protrusion to gradually recover from deformation, extinguish the oxyacetylene flame, and immediately spray water to cool the heated part. Repeat 4 times; E. Machining: Place the parts into a CNC lathe for machining; F. Quenching and tempering treatment: The mounting surface and matching surface of the parts are quenched and tempered. The quenching and tempering method is: use an electric heating furnace to heat the workpiece to 840℃, take it out after heating, and quench it with water cooling; after quenching, temper it at 600℃, keep it warm for 30 minutes, and cool it naturally after the holding time is up; The surface hardness of the quenched and tempered workpiece should be at least HRC45; G. Surface cleaning: Use metal parts cleaning agent to clean and wipe; H. Assembly: Assemble according to the assembly drawing.

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