A valve sleeve pin hole processing fixture

Abstract

The present invention provides a valve sleeve pin hole processing fixture, which belongs to the technical field of processing equipment. It solves the problem that the existing fixtures easily lead to large position deviation of the pin hole. The valve sleeve pin hole processing fixture includes a vertical plate and a clamping member, a core shaft is fixed on the vertical plate, the front end of the core shaft has a positioning section, a positioning bushing is arranged on the vertical plate, a positioning surface is arranged on the front end surface of the positioning bushing, a sliding sleeve is sleeved on the core shaft, the front end of the sliding sleeve has a conical positioning head, a spring 1 is connected to the sliding sleeve, the spring 1 acts on the sliding sleeve to make the positioning head protrude from the positioning surface, a through groove is provided on the outer side surface of the positioning section, and a positioning block 1 and a positioning block 2 that can slide in the radial direction are installed in the through groove, a spring 2 is connected between the positioning block 1 and the positioning block 2, and the spring 2 acts on the positioning block 1 and the positioning block 2 to make the outer end of the positioning block 1 and the outer end of the positioning block 2 extend from the two ends of the through groove respectively. The valve sleeve pin hole processing fixture can improve the position accuracy of the pin hole.

Description

Technical Field

[0001] The invention belongs to the technical field of processing equipment and relates to a valve sleeve pin hole processing fixture. Background Art

[0002] The steering gear is an important part of the automobile steering system. Its function is to appropriately transform the steering torque and steering angle from the steering wheel, and then output it to the steering rod mechanism to steer the car. A control valve is provided on the steering gear to provide steering assistance, so that the steering wheel can turn lightly when the car is driving at low speed, and the steering wheel will not feel floating when driving at high speed. Taking the rack and pinion steering gear as an example, the steering gear includes a housing, a rack, a gear shaft and a gap adjustment mechanism are installed in the housing, the rack is meshed with the gear shaft, the gap adjustment mechanism acts on the rack to make the rack and the gear shaft have a suitable gear gap, and the gear shaft is connected to the steering wheel. A control valve is provided between the gear shaft and the steering wheel. The control valve includes a valve body and a valve core. One end of the valve core is connected to the steering wheel, and the other end of the valve core is connected to the gear shaft.

[0003] Chinese patent literature has disclosed a sliding-fit automobile steering control valve core, [application number: CN200820191312.5; announcement number: CN 201317390Y], which consists of an input shaft, a torsion bar, a valve sleeve, a gear shaft, a short cylindrical pin and a long cylindrical pin. The lower end of the torsion bar is rigidly connected to the center hole at the upper end of the gear shaft through an interference fit, the torsion bar is sleeved with an input shaft, and the input shaft and the upper end of the torsion bar are rigidly connected through a long cylindrical pin; the lower end of the input shaft is equipped with a valve sleeve, the valve sleeve and the gear shaft are rigidly connected through a short cylindrical pin, and the inner hole at the lower end of the input shaft is positioned by sliding fit with the lower end of the torsion bar. A pin hole is provided at the lower end of the valve sleeve, and a short cylindrical pin is inserted in the pin hole. The pin hole has certain position requirements, and the position of the pin hole includes the symmetry between the pin hole and the inner hole of the valve sleeve and the angle between the pin hole and the inner groove of the valve sleeve.

[0004] Chinese patent literature has disclosed a special tool for drilling holes in cylindrical parts [application number: CN201110301886.X; announcement number: CN 102335772B], which includes a pressure plate, a base and a positioning block. A drill sleeve hole is machined on the pressure plate, and a drill sleeve is inserted into the drill sleeve hole. A high vertical plate, a low vertical plate and a supporting vertical plate are fixedly connected to the upper end surface of the base, and the supporting vertical plate is located between the high vertical plate and the low vertical plate. The pressure plate is fixed to the upper end of the high vertical plate, and the drill sleeve is located above the supporting vertical plate. A V-shaped groove is machined on the upper end surface of the supporting vertical plate. A threaded through hole is machined on the low vertical plate, and a screw is connected to the inner thread of the threaded through hole. The positioning block is composed of a small-diameter cylinder and a large-diameter cylinder that are made into one piece. The small-diameter cylinder matches the inner hole of the part, and the end face of the large-diameter cylinder is tightened with a screw. When in use, place the part in the V-shaped groove, place one end of the part against the high vertical plate, insert the positioning block into the other end of the part, turn the screw to tighten it against the positioning block, and insert the drill bit from the drill sleeve to drill the part. When the above-mentioned tooling positioning valve sleeve is used to process the pin hole, the angle between the pin hole and the inner groove of the valve sleeve cannot be guaranteed, which easily leads to a large position deviation of the pin hole.

[0005] Chinese patent literature has disclosed a casing through-hole processing tool, [application number: CN201010546090.6; announcement number: CN101982271B], including a support part, a fixing device fixedly connected to the support part for fixing the casing, a clamping device for clamping the casing and a positioning device for preventing the casing from rotating, the fixing device, the clamping device and the positioning device are arranged on the same side of the support part, and a processing part is arranged directly above the fixing device, and the processing part is provided with a processing positioning hole for inserting a drill bit. The fixing device is a fixing block extending in the horizontal direction, and a through hole for inserting a drill bit is arranged at a position corresponding to the processing positioning hole on the fixing block, and the outer diameter of the fixing block matches the inner diameter of the casing. The positioning device is a protrusion arranged on one side of the fixing block, and the casing is circumferentially positioned by the protrusion. In order to adapt to the positioning processing of the valve sleeve, a protrusion with a positioning function is often arranged on the core shaft, so that the protrusion is inserted into the inner groove of the valve sleeve for positioning. A groove is provided on the fixing block, and the protrusion is installed in the groove, and a spring is connected between the bottom surface of the groove and the protrusion, and the outer end of the protrusion is extended out of the groove by the action of the spring and inserted into the inner groove of the valve sleeve for positioning. Due to the existence of machining errors of the inner hole of the valve sleeve and in order to facilitate the disassembly and assembly of the valve sleeve on the fixing block, there is often a certain gap between the inner hole of the valve sleeve and the fixing block. When the protrusion presses against one side of the valve sleeve, the valve sleeve will be eccentric, which will cause a large deviation in symmetry between the pin hole and the inner hole of the valve sleeve, and also cause a large deviation in the angle between the pin hole and the inner groove of the valve sleeve. Summary of the invention

[0006] The purpose of the present invention is to address the above problems existing in the prior art and to propose a valve sleeve pin hole machining fixture, which solves the technical problem that the prior fixture easily leads to large position deviation of the pin hole.

[0007] The purpose of the present invention can be achieved by the following technical solutions:

[0008] The cam is provided with a plurality of camshafts, each of which is provided with a plurality of camshafts, each of which is provided with a plurality of camshafts, each of which is provided with a plurality of camshafts, each of which is provided with a plurality of camshafts, each of which is provided with a plurality of camshafts.

[0009] There are six or eight inner grooves evenly distributed along the circumferential direction on the hole wall surface of the inner hole of the valve sleeve. The end of the valve sleeve provided with the pin hole is the processing end. The end surface of the processing end has a positioning end surface, and the processing end has a positioning cone surface located at the inner hole port. When in use, the valve sleeve is put on the positioning section from the processing end, the positioning head of the sliding sleeve is inserted into the inner hole of the valve sleeve, and the conical surface on the outer side of the positioning head abuts against the positioning cone surface of the processing end, and the valve sleeve is rotated so that the outer ends of the positioning block 1 and the positioning block 2 are respectively embedded in the two inner grooves arranged oppositely, so that the valve sleeve and the core shaft are fixed circumferentially. Under the action of the second spring, the outer ends of the positioning block 1 and the positioning block 2 abut against the bottom surface of the inner groove, and then the clamping member acts on the valve sleeve, so that the positioning end surface of the processing end of the valve sleeve abuts against the positioning surface of the positioning bushing to fix the valve sleeve axially. When the clamping piece presses the valve sleeve to fix it axially, the positioning block 1 and the positioning block 2 are pressed against the valve sleeve under the action of the same spring 2, so that the forces on both sides of the valve sleeve are the same, preventing the valve sleeve from being deflected. At the same time, under the action of spring 1, the conical surface on the positioning head always presses against the positioning conical surface of the valve sleeve, so that the valve sleeve and the sliding sleeve are in a coaxial state, and the sliding sleeve and the core shaft are coaxially arranged, so that the valve sleeve and the core shaft can be kept in a coaxial state as much as possible, thereby improving the symmetry between the pin hole and the inner hole of the valve sleeve and the machining accuracy of the angle between the pin hole and the inner groove of the valve sleeve, thereby improving the position accuracy of the pin hole.

[0010] In the valve sleeve pin hole machining fixture, the four side surfaces of the positioning block 1 are respectively in contact with the four groove walls of the through groove, and the four side surfaces of the positioning block 2 are also respectively in contact with the four groove walls of the through groove.

[0011] This ensures that positioning block 1 and positioning block 2 will not shake in the through groove, ensures the stability of circumferential positioning through positioning block 1 and positioning block 2, is beneficial to improve the angular accuracy between the pin hole and the inner groove of the valve sleeve, and is beneficial to improve the position accuracy of the pin hole.

[0012] In the above-mentioned valve sleeve pin hole processing fixture, the inner end of the positioning block 1 is provided with a protruding mounting portion 1, and the mounting portion 1 is provided with a strip-shaped mounting hole 1, and a mounting pin 1 is passed through the mounting hole 1, and both ends of the mounting pin 1 extend out of the mounting hole 1 and are inserted into the positioning section; the inner end of the positioning block 2 is provided with a protruding mounting portion 2, and the mounting portion 2 is provided with a strip-shaped mounting hole 2, and a mounting pin 2 is passed through the mounting hole 2, and both ends of the mounting pin 2 extend out of the mounting hole 2 and are inserted into the positioning section; there is an accommodating space between the mounting portion 1 and the mounting portion 2, and the spring 2 is located in the accommodating space.

[0013] The positioning block 1 is limited in the through slot by the mounting part 1 and the mounting pin 1 to prevent the positioning block 1 from being completely ejected from the through slot under the action of the spring 1. The positioning block 2 is limited in the through slot by the mounting part 2 and the mounting pin 2 to prevent the positioning block 2 from being completely ejected from the through slot under the action of the spring 1, thereby ensuring the stability of the use of the clamp, avoiding the influence of repeated installation of the positioning block 1 and the positioning block 2 on the processing accuracy, and facilitating the position accuracy of the pin hole. The spring 1 is installed in the accommodation space between the mounting part 1 and the mounting part 2, so that the installation position of the spring 1 is close to the center, so that the spring 1 exerts uniform force on the positioning block 1 and the positioning block 2, preventing the positioning block 1 and the positioning block 2 from being stuck or even stuck when sliding in the through slot, so that the positioning block 1 and the positioning block 2 can stably and accurately position the valve sleeve when in use, which is conducive to ensuring the position accuracy of the pin hole.

[0014] In the above-mentioned valve sleeve pin hole processing fixture, the inner end of the positioning block one also has a protruding limit part one, and the limit part one is inserted into the accommodating space. The inner end of the positioning block two also has a protruding limit part two, and the limit part two is inserted into the accommodating space. The spring two is located between the limit part one and the limit part two.

[0015] The limiting part 1 and the limiting part 2 have a further limiting effect, so that the installation position of the spring 1 is closer to the center, so that the force of the spring one on the positioning block 1 and the positioning block 2 is more uniform, and the positioning block 1 and the positioning block 2 are further prevented from getting stuck or even stuck when sliding in the through groove, so that the positioning block 1 and the positioning block 2 can stably and accurately position the valve sleeve when in use, which is conducive to ensuring the position accuracy of the pin hole.

[0016] In the above-mentioned valve sleeve pin hole processing fixture, the first limiting portion abuts against the side surface of the second mounting portion, and the second limiting portion abuts against the side surface of the first mounting portion.

[0017] The cooperation between the limiting part 1 and the mounting part 2, as well as the cooperation between the limiting part 2 and the mounting part 1, enables the positioning block 1 and the positioning block 2 to guide each other, ensuring that the sliding directions of the positioning block 1 and the positioning block 2 in the through groove are accurate, and that the positioning block 1 and the positioning block 2 exert the same force on the valve sleeve, which is beneficial to ensuring the position accuracy of the pin hole processing.

[0018] In the above-mentioned valve sleeve pin hole processing fixture, the core shaft has a matching section located behind the positioning section, the sliding sleeve is sleeved on the matching section and there is a clearance fit between the matching section and the sliding sleeve, and a positioning convex ring is provided on the outer side surface of the positioning section behind the through groove, the outer side surface of the positioning convex ring is a cylindrical surface, and the positioning convex ring can be clearance-fitted with the inner hole of the valve sleeve.

[0019] The matching section and the sleeve are clearance matched, which enables the sleeve to slide on the core shaft, so that the positioning surface can be positioned against the positioning end surface of the valve sleeve, and the positioning head of the sleeve can always be against the positioning cone surface under the action of the spring, and on the other hand, the sleeve is kept coaxial with the core shaft as much as possible during the sliding process, so that the valve sleeve and the core shaft are kept coaxial as much as possible, which is conducive to improving the position accuracy of the pin hole. The coaxiality between the valve sleeve and the core shaft can be better guaranteed by setting the positioning convex ring, which is conducive to ensuring the position accuracy of the pin hole.

[0020] In the above-mentioned valve sleeve pin hole processing fixture, an annular groove is provided on the outer side surface of the core shaft between the matching section and the positioning section, the positioning head is located outside the annular groove, and an axial gap is provided between the positioning head and the positioning section.

[0021] The setting of the annular groove and the axial clearance, on the one hand, leaves space for inserting the drill bit when processing the pin hole, ensuring that the pin hole can be drilled through while avoiding the drill bit drilling into the core shaft; on the other hand, it ensures that the positioning head part is not interfered when the sleeve slides on the core shaft, thereby ensuring the coaxiality of the sleeve and the core shaft as much as possible, which is beneficial to ensuring the position accuracy of the pin hole.

[0022] In the above-mentioned valve sleeve pin hole processing fixture, a fixed plate is fixed behind the vertical plate, the rear end of the core shaft is fixed on the fixed plate, an installation space is set between the vertical plate and the fixed plate, the rear end of the sliding sleeve extends out of the vertical plate and is located in the installation space, a protruding stopper is set on the outer side surface of the rear end of the sliding sleeve on the stop edge of the vertical plate, the spring one is mounted on the core shaft, and the two ends of the spring one respectively abut against the fixed plate and the sliding sleeve.

[0023] The installation position of spring one can make the sleeve bear the force evenly and make the sleeve slide smoothly on the core shaft; the setting of the stop edge has a limiting effect to prevent the sleeve from sliding forward excessively, so that an axial gap is always maintained between the locating head and the locating section, avoiding the locating head and the locating section from colliding, and preventing the locating head and the locating section from colliding and affecting the accuracy, which is beneficial to ensure the position accuracy of the pin hole.

[0024] In the valve sleeve pin hole processing fixture, a pad is fixed between the vertical plate and the fixed plate, and the two ends of the pad are respectively abutted against the vertical plate and the fixed plate. The pad stabilizes the installation space between the vertical plate and the fixed plate, thereby stabilizing the installation of the spring 1.

[0025] In the above-mentioned valve sleeve pin hole processing fixture, the fixing plate is provided with a flat square hole, the rear end of the core shaft is provided with a flat square section matching the flat square hole, and the flat square section is inserted into the flat square hole. The core shaft is circumferentially fixed by the flat square hole and the flat square section, so as to prevent the core shaft from rotating during the pin hole processing process and affecting the position accuracy of the pin hole, which is conducive to ensuring the position accuracy of the pin hole.

[0026] In the above-mentioned valve sleeve pin hole processing fixture, the clamping part includes a pressure plate and an angle cylinder, the angle cylinder is fixed on the vertical plate, the piston rod of the angle cylinder is arranged parallel to the core shaft, the pressure plate is fixedly connected to the piston rod of the angle cylinder, and the pressure plate and the piston rod of the angle cylinder are arranged vertically, and the angle cylinder can drive the pressure plate to rotate to the front of the core shaft and press the valve sleeve onto the positioning bushing.

[0027] When the angle cylinder is actuated, the piston rod of the angle cylinder can rotate 90° and retract into the cylinder body of the angle cylinder; when the angle cylinder is reversed, the piston rod of the angle cylinder can rotate 90° in the reverse direction and extend outward. When in use, the valve sleeve is mounted on the positioning section, and positioning block one and positioning block two are respectively embedded in the inner groove of the valve sleeve, and then the angle cylinder is actuated to drive the pressure plate to rotate 90° to the front of the core shaft, and at the same time, the pressure plate moves axially backward to press the valve sleeve onto the positioning sleeve; after the pin hole is processed, the angle cylinder is reversed to drive the pressure plate to move axially forward to release the valve sleeve, and at the same time, it rotates 90° in the reverse direction to leave the core shaft. The angle cylinder is set to make the process of tightening and loosening the valve sleeve convenient and accurate. The position of the angle cylinder and the pressure plate enables the pressure plate to evenly apply axial force to the valve sleeve during the process of tightening the valve sleeve, reducing factors that cause eccentricity of the valve sleeve, which is conducive to ensuring the position accuracy of the pin hole.

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

[0029] A positioning block 1 and a positioning block 2 acted by the same spring 2 are arranged on the positioning section of the core shaft, and a conical positioning head is arranged at the front end of the sliding sleeve, and the sliding sleeve is connected with spring 1, which can improve the position accuracy of the pin hole. The structure of the positioning block 1 and the positioning block 2 and the connection relationship between the two enable the positioning block 1 and the positioning block 2 to slide smoothly in the through groove and be evenly stressed, which is beneficial to improving the position accuracy of the pin hole. A matching section that matches the clearance of the sliding sleeve is arranged on the core shaft, an annular groove is arranged between the matching section and the positioning section on the core shaft, and a flat square section is arranged at the rear end of the core shaft, all of which are beneficial to ensuring the position accuracy of the pin hole. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 is a three-dimensional diagram of a valve sleeve;

[0031] Figure 2 This is a three-dimensional diagram of the valve sleeve pin hole processing fixture;

[0032] Figure 3 This is a partial cross-sectional view of the valve sleeve after the valve sleeve pin hole processing fixture is installed;

[0033] Figure 4 yes Figure 3 An enlarged view of the center shaft positioning section;

[0034] Figure 5 yes Figure 3 Sectional view in the AA direction;

[0035] Figure 6 This is a three-dimensional diagram of the core shaft in the valve sleeve pin hole processing fixture;

[0036] Figure 7 This is a three-dimensional diagram of the positioning block 1 in the valve sleeve pin hole processing fixture;

[0037] Figure 8 This is a three-dimensional view of the valve sleeve after the valve sleeve pin hole processing fixture is installed.

[0038] In the figure, 1, valve sleeve; 1a, inner hole; 1b, inner groove; 1c, processed end; 1c1, positioning end face; 1c2, positioning cone face; 1c3, pin hole; 2, bottom plate; 3, vertical plate; 3a, fixing hole; 4, fixing plate; 4a, flat square hole; 5, installation space; 6, backing plate; 7, fixing bolt; 8, mandrel; 8a, flat square section; 8b, positioning section; 8b1, through groove; 8b2, positioning convex ring; 8b3, through hole 1; 8b4, through hole 2; 8c, matching section; 8d, annular groove; 9, fixed Positioning block one; 9a, mounting part one; 9a1, mounting hole one; 9b, limiting part one; 10, positioning block two; 10a, mounting part two; 10a1, mounting hole two; 10b, limiting part two; 11, spring two; 12, mounting pin one; 13, mounting pin two; 14, accommodating space; 15, sliding sleeve; 15a, positioning head; 15b, stop edge; 15c, avoidance; 16, axial clearance; 17, spring one; 18, positioning bushing; 18a, positioning surface; 19, pressure plate; 20, angle cylinder. DETAILED DESCRIPTION

[0039] The following are specific embodiments of the present invention and the accompanying drawings to further describe the technical solution of the present invention, but the present invention is not limited to these embodiments.

[0040] Embodiment 1

[0041] like Figure 1 As shown, the steering gear control valve includes a valve sleeve 1, which is provided with an inner hole 1a, and the hole wall surface of the inner hole 1a of the valve sleeve 1 is uniformly distributed with six or eight inner grooves 1b along the circumferential direction. One end of the valve sleeve 1 is a processing end 1c, and the end surface of the processing end 1c is provided with a positioning end surface 1c1, and the processing end 1c is provided with a positioning cone surface 1c2 at the end of the inner hole 1a, and the outer side surface of the processing end 1c is provided with a pin hole 1c3 penetrating the side wall of the valve sleeve 1.

[0042] like Figure 2-Figure 8 As shown, a valve sleeve pin hole processing fixture includes a bottom plate 2, a vertical plate 3 is fixed on the bottom plate 2, and a fixing hole 3a is opened on the vertical plate 3. A fixing plate 4 is fixed to the rear of the vertical plate 3, and a flat square hole 4a opposite to the fixing hole 3a is provided on the fixing plate 4. An installation space 5 is provided between the fixing plate 4 and the vertical plate 3, and a pad 6 is fixed between the vertical plate 3 and the fixing plate 4, and the two ends of the pad 6 are respectively abutted against the vertical plate 3 and the fixing plate 4, and the installation space 5 between the fixing plate 4 and the vertical plate 3 is maintained by the pad 6. During assembly, the pad 6 is placed between the vertical plate 3 and the fixing plate 4, and then the fixing bolt 7 is passed through the pad 6 from the fixing plate 4 and threadedly connected to the fixing plate 4, and the fixing bolt 7 is tightened to fix the three.

[0043] A core shaft 8 is inserted into the fixing hole 3a, and a flat square section 8a matching with the flat square hole 4a is arranged on the rear end of the core shaft 8, and the flat square hole 4a and the flat square section 8a are tightly matched, and the flat square section 8a is inserted into the flat square hole 4a to fix the core shaft 8 and the vertical plate 3. The front end of the core shaft 8 has a positioning section 8b matching with the valve sleeve 1, and a through groove 8b1 penetrating in the radial direction is provided on the outer side surface of the positioning section 8b, and a protruding positioning convex ring 8b2 is arranged on the outer side surface of the positioning section 8b behind the through groove 8b1, and the outer side surface of the positioning convex ring 8b2 is a cylindrical surface and the positioning convex ring 8b2 can be gap-matched with the inner hole 1a of the valve sleeve 1. A positioning block 19 and a positioning block 210 which can slide in the radial direction are installed in the through groove 8b1. A spring 211 is connected between the positioning block 19 and the positioning block 210. The spring 211 acts on the positioning block 19 and the positioning block 210 so that the outer ends of the positioning block 19 and the outer ends of the positioning block 210 extend from the two ends of the through groove 8b1 respectively. The four side surfaces of the positioning block 19 are respectively in contact with the four groove walls of the through groove 8b1, and the four side surfaces of the positioning block 210 are also respectively in contact with the four groove walls of the through groove 8b1. The outer end surface of the positioning block 19 has a protruding arc surface 1, and the outer end surface of the positioning block 210 has a protruding arc surface 2. The inner end of the positioning block 19 has a protruding mounting portion 19a and a limiting portion 19b, and the mounting portion 19a and the limiting portion 19b are separately arranged and parallel to each other. The inner end of the positioning block 10 has a protruding mounting portion 10a and a limiting portion 10b, and the mounting portion 10a and the limiting portion 10b are separately arranged and parallel to each other. The mounting portion 10a has a strip-shaped mounting hole 10a1, and a mounting pin 12 is inserted into the mounting hole 10a1. The two ends of the mounting pin 12 extend out of the mounting hole 10a1 and are inserted into the through hole 10b3 of the positioning section 8b. The mounting portion 10a has a strip-shaped mounting hole 10a1, and a mounting pin 13 is inserted into the mounting hole 10a1. The two ends of the mounting pin 13 extend out of the mounting hole 10a1 and are inserted into the through hole 10b4 of the positioning section 8b. There is an accommodating space 14 between the mounting portion 10a and the mounting portion 10a, and the spring 11 is located in the accommodating space 14. The limiting part 1 9b is inserted into the accommodating space 14 and the limiting part 1 9b is pressed against the side of the mounting part 2 10a. The limiting part 2 10b is inserted into the accommodating space 14 and the limiting part 2 10b is pressed against the side of the mounting part 1 9a. The spring 2 11 is located between the limiting part 1 9b and the limiting part 2 10b. When installing the positioning block 1 9 and the positioning block 2 10, first insert the positioning block 1 9 into the through slot 8b1 through one end of the through slot 8b1, then insert the spring 2 11 into the through slot 8b1 through the other end of the through slot 8b1, then insert the positioning block 2 10 into the through slot 8b1 through the other end of the through slot 8b1, and finally insert the mounting pin 12 into the through hole 1 8b3 and the mounting hole 1 9a1, and insert the mounting pin 2 13 into the through hole 2 8b4 and the mounting hole 2 10a1.A matching section 8c is provided on the core shaft 8 between the flat square section 8a and the positioning section 8b, and an annular groove 8d is provided on the outer surface of the core shaft 8 between the matching section 8c and the positioning section 8b.

[0044] The matching section 8c of the mandrel 8 is sleeved with a sleeve 15, which is coaxially arranged with the mandrel 8, and there is a clearance fit between the sleeve 15 and the matching section 8c. The front end of the sleeve 15 has a conical positioning head 15a, and the outer side surface of the positioning head 15a is a conical surface and can match with the positioning cone surface 1c2 of the valve sleeve 1. The positioning head 15a is located outside the annular groove 8d, and there is an axial gap 16 between the positioning head 15a and the positioning section 8b. The rear end of the sleeve 15 extends out of the vertical plate 3 and is located in the installation space 5. The outer side surface of the rear end of the sleeve 15 is provided with a protruding stopper 15b on the vertical plate 3. The rear end of the sleeve 15 is connected with a spring 17, which is sleeved on the mandrel 8, and the two ends of the spring 17 are respectively against the fixed plate 4 and the sleeve 15. The positioning head 15a is provided with an avoidance opening 15c for inserting a drill bit. The sliding sleeve 15 is sheathed with a positioning bushing 18, and the rear end of the positioning bushing 18 is inserted into the fixing hole 3a and fixed. A positioning surface 18a is provided on the front end surface of the positioning bushing 18, and the positioning head 15a protrudes from the positioning surface 18a.

[0045] A clamping member for clamping the valve sleeve 1 onto the vertical plate 3 is fixed on the vertical plate 3. The clamping member includes a clamping plate 19 and an angle cylinder 20. The angle cylinder 20 is fixed on the front end surface of the vertical plate 3. The piston rod of the angle cylinder 20 is arranged parallel to the core shaft 8. The clamping plate 19 is fixedly connected to the piston rod of the angle cylinder 20. The clamping plate 19 and the piston rod of the angle cylinder 20 are arranged vertically. The angle cylinder 20 can drive the clamping plate 19 to rotate to the front of the core shaft 8 and clamp the valve sleeve 1 onto the positioning bushing 18. The angle cylinder 20 is generally arranged below the core shaft 8. When the valve sleeve 1 does not need to be clamped, the clamping plate 19 is in a horizontal state. When the valve sleeve 1 needs to be clamped, the angle cylinder 20 drives the clamping plate 19 to rotate upward. The clamping plate 19 is in a vertical state and is located in front of the core shaft 8. One mandrel 8 corresponds to one pressing member. In order to improve working efficiency, multiple mandrels 8 and pressing members can be arranged on the vertical plate 3. These mandrels 8 are evenly arranged in the horizontal direction on the vertical plate 3.

[0046] When in use, the valve sleeve 1 is mounted on the positioning section 8b from the processing end 1c, the positioning head 15a of the sliding sleeve 15 is inserted into the inner hole 1a, and the outer conical surface of the positioning head 15a abuts against the positioning conical surface 1c2 of the processing end 1c, and the valve sleeve 1 is rotated so that the outer ends of the positioning block 19 and the outer ends of the positioning block 2 10 are respectively embedded in the two oppositely arranged inner grooves 1b, so that the valve sleeve 1 and the core shaft 8 are fixed in the circumferential direction. Under the action of the spring 2 11, the outer ends of the positioning block 19 and the outer ends of the positioning block 2 10 abut against the bottom surface of the inner groove 1b, and then the angle cylinder 20 is actuated to make the pressure plate 19 act on the valve sleeve 1, and the positioning end surface 1c1 of the processing end 1c of the valve sleeve 1 abuts against the positioning surface 18a of the bushing to fix the valve sleeve 1 axially. After the valve sleeve 1 is fixed, the pin hole 1c3 of the valve sleeve 1 is processed. After the processing is completed, the angle cylinder 20 reverses to release the axial fixed state of the valve sleeve 1, and then the valve sleeve 1 can be removed from the core shaft 8. When the pressure plate 19 presses the valve sleeve 1 for axial fixation, the positioning block 1 9 and the positioning block 2 10 are pressed against the valve sleeve 1 under the action of the same spring 2 11, so that the forces on both sides of the valve sleeve 1 are the same, preventing the valve sleeve 1 from being deflected. At the same time, under the action of the spring 17, the conical surface on the positioning head 15a always presses against the positioning conical surface 1c2 of the valve sleeve 1, so that the valve sleeve 1 and the core shaft 8 can be kept coaxial as much as possible, thereby improving the symmetry between the pin hole 1c3 and the inner hole 1a of the valve sleeve 1 and the machining accuracy of the angle between the pin hole 1c3 and the inner groove 1b of the valve sleeve 1, thereby improving the position accuracy of the pin hole 1c3.

[0047] The specific embodiments described herein are merely examples of the spirit of the present invention. Those skilled in the art may make various modifications or additions to the specific embodiments described or replace them in similar ways, but they will not deviate from the spirit of the present invention or exceed the scope defined by the appended claims.

Claims

1. A valve sleeve pin hole processing fixture, comprising a vertical plate (3) and a pressing member for pressing a valve sleeve (1) onto the vertical plate (3), a core shaft (8) being fixed to the vertical plate (3), a front end of the core shaft (8) having a positioning section (8b) capable of cooperating with the valve sleeve (1), characterized in that: The vertical plate (3) is provided with a positioning sleeve (18), and a positioning surface (18a) is provided on the front end surface of the positioning sleeve (18). The core shaft (8) is provided with a sliding sleeve (15) located in the positioning sleeve (18). The sliding sleeve (15) is located behind the positioning section (8b) and is coaxially arranged with the core shaft (8). The front end of the sliding sleeve (15) has a conical positioning head (15a). The sliding sleeve (15) is connected with a spring 1 (17). The spring 1 (17) acts on the sliding sleeve (15) to make the positioning head (15a) protrude from the positioning surface (18a). The outer side surface of the positioning section (8b) is provided with a through groove (8b1) penetrating in the radial direction. A positioning block 1 (9) and a positioning block 2 (10) which can slide in the radial direction are installed in the through groove (8b1), and a spring 2 (11) is connected between the positioning block 1 (9) and the positioning block 2 (10). The spring 2 (11) acts on the positioning block 1 (9) and the positioning block 2 (10) so that the outer ends of the positioning block 1 (9) and the outer ends of the positioning block 2 (10) extend out from the two ends of the through groove (8b1) respectively. The four side surfaces of the positioning block 1 (9) are respectively in contact with the four groove walls of the through groove (8b1), and the four side surfaces of the positioning block 2 (10) are also respectively in contact with the four groove walls of the through groove (8b1). The inner end of the positioning block 1 (9) has a protruding mounting portion 1 (9a). ), the mounting portion 1 (9a) has a strip-shaped mounting hole 1 (9a1), a mounting pin 1 (12) is inserted into the mounting hole 1 (9a1), both ends of the mounting pin 1 (12) extend out of the mounting hole 1 (9a1) and are inserted into the positioning section (8b), the inner end of the positioning block 2 (10) has a protruding mounting portion 2 (10a), the mounting portion 2 (10a) has a strip-shaped mounting hole 2 (10a1), a mounting pin 2 (13) is inserted into the mounting hole 2 (10a1), both ends of the mounting pin 2 (13) extend out of the mounting hole 2 (10a1) and are inserted into the positioning section (8b), the mounting portion 1 (9a) and the mounting portion 2 (1 0a), the spring 2 (11) is located in the accommodating space (14), the inner end of the positioning block 1 (9) also has a protruding limiting portion 1 (9b), the limiting portion 1 (9b) is inserted into the accommodating space (14), the inner end of the positioning block 2 (10) also has a protruding limiting portion 2 (10b), the limiting portion 2 (10b) is inserted into the accommodating space (14), the spring 2 (11) is located between the limiting portion 1 (9b) and the limiting portion 2 (10b), the limiting portion 1 (9b) is abutted against the side surface of the mounting portion 2 (10a), and the limiting portion 2 (10b) is abutted against the side surface of the mounting portion 1 (9a).

2. The valve sleeve pin hole processing fixture according to claim 1, characterized in that: The core shaft (8) has a matching section (8c) located behind the positioning section (8b), the sliding sleeve (15) is sleeved on the matching section (8c), and there is a clearance fit between the matching section (8c) and the sliding sleeve (15), and a positioning convex ring (8b2) is provided on the outer side surface of the positioning section (8b) behind the through groove (8b1), the outer side surface of the positioning convex ring (8b2) is a cylindrical surface, and the positioning convex ring (8b2) can be clearance-fitted with the inner hole (1a) of the valve sleeve (1).

3. The valve sleeve pin hole processing fixture according to claim 2, characterized in that: An annular groove (8d) is provided on the outer side surface of the core shaft (8) between the matching section (8c) and the positioning section (8b); the positioning head (15a) is located outside the annular groove (8d); and an axial gap (16) is provided between the positioning head (15a) and the positioning section (8b).

4. The valve sleeve pin hole processing fixture according to claim 1, characterized in that: A fixed plate (4) is fixed to the rear of the vertical plate (3), a rear end of the core shaft (8) is fixed on the fixed plate (4), an installation space (5) is provided between the vertical plate (3) and the fixed plate (4), a rear end of the sliding sleeve (15) extends out of the vertical plate (3) and is located in the installation space (5), a protruding stopper (15b) on the outer surface of the rear end of the sliding sleeve (15) is provided on the stop edge (15b) of the vertical plate (3), the spring 1 (17) is sleeved on the core shaft (8), and two ends of the spring 1 (17) respectively abut against the fixed plate (4) and the sliding sleeve (15).

5. The valve sleeve pin hole machining fixture according to claim 4, characterized in that: A pad (6) is fixed between the vertical plate (3) and the fixed plate (4), and two ends of the pad (6) are respectively abutted against the vertical plate (3) and the fixed plate (4).

6. The valve sleeve pin hole machining fixture according to claim 1, characterized in that: The pressing member comprises a pressing plate (19) and an angular cylinder (20); the angular cylinder (20) is fixed on the vertical plate (3); the piston rod of the angular cylinder (20) is arranged parallel to the core shaft (8); the pressing plate (19) is fixedly connected to the piston rod of the angular cylinder (20); the pressing plate (19) and the piston rod of the angular cylinder (20) are arranged perpendicularly; the angular cylinder (20) can drive the pressing plate (19) to rotate to the front of the core shaft (8) and press the valve sleeve (1) onto the positioning bushing (18).

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