Plunger sleeve plane grinding clamp

Abstract

The invention discloses a plunger sleeve plane grinding clamp which comprises a base, a left clamping mechanism, a right clamping mechanism, a positioning rod, a supporting plate, two springs and two limiting rods. N rows of holes are formed in the base, each row of holes comprises two limiting holes and a positioning hole, and two limiting rod assembling holes and an avoiding hole are formed in the supporting plate; the lower portions of the two springs extend into the two limiting holes in the ith row of holes to abut against the two limiting holes respectively, the upper ends of the two limiting rods are in interference fit with the two limiting rod assembling holes respectively, the middle portions and the lower ends of the two limiting rods are inserted into the two springs respectively, and the supporting plate is supported at the upper ends of the two springs. The lower portion of the positioning rod is in interference fit with the positioning hole in the ith row of holes, and the upper portion of the positioning rod penetrates through the receding hole and can be in clearance fit with the bypass valve sleeve assembling hole of the plunger sleeve. By the adoption of the device, the parallelism between the plane to be ground and the axis of the plunger sleeve and the perpendicularity between the plane to be ground and the bypass valve sleeve assembling hole can be guaranteed, meanwhile, the machining process is simpler and faster, and the cost is lower.

Description

Technical Field

[0001] The invention belongs to the field of mechanical processing, and in particular relates to a plunger sleeve surface grinding fixture. Background Art

[0002] The electronically controlled unit pump is a component of the second-generation fuel injection system. The plunger sleeve is a key component of the electronically controlled unit pump. The two side planes of the plunger sleeve (i.e., the baffle mounting plane and the solenoid valve mounting plane) are the mounting planes for precision parts such as the solenoid valve and bypass valve assembly. There are bypass valve sleeve mounting holes on the side planes for assembling bypass valve components. The side plane must ensure good parallelism with the axis of the plunger sleeve and good verticality with the bypass valve sleeve mounting hole on it to effectively ensure the good performance of the electronically controlled unit pump.

[0003] Traditional surface grinders directly grind the two side planes, using the self as the reference for grinding. The parallelism between the side plane and the axis of the plunger sleeve is seriously out of tolerance, and the verticality between the side plane and the bypass valve sleeve assembly hole on it is seriously out of tolerance. However, the use of advanced grinders for one-clamp-one-top grinding can effectively ensure parallelism, but the bypass valve sleeve assembly hole needs to be aligned piece by piece, which is inefficient and increases the economic cost of the enterprise. Summary of the invention

[0004] The purpose of the present invention is to provide a plunger sleeve surface grinding fixture to ensure the parallelism of the side plane of the plunger sleeve with the axial center line of the plunger sleeve and the verticality with the matching hole of the bypass valve sleeve, while making the processing process simpler, faster and less costly.

[0005] The plunger sleeve surface grinding fixture described in the present invention includes: a base, a left clamping body fixedly connected to the left part of the base, a right clamping body fixedly connected to the right part of the base, a left clamping mechanism installed in the left clamping body and capable of moving and partially extending out of the left clamping body, and a right clamping mechanism installed in the right clamping body and capable of moving and partially extending out of the right clamping body; the left clamping mechanism cooperates with the right clamping mechanism to support the two ends of the plunger sleeve. The plunger sleeve surface grinding fixture also includes a positioning rod, a support plate, two springs and two limit rods; n rows of holes are provided on the base, each row of holes includes two limit holes and a positioning hole located between the two limit holes, and two limit rod assembly holes and an avoidance hole are provided on the support plate; the lower parts of the two springs respectively extend into the two limit holes in the i-th row of holes to abut against each other, the upper ends of the two limit rods are respectively interference fit with the two limit rod assembly holes, the middle parts and lower ends of the two limit rods are respectively inserted into the two springs, the support plate is supported on the upper ends of the two springs, the lower part of the positioning rod is interference fit with the positioning hole in the i-th row of holes, the upper part of the positioning rod passes through the avoidance hole, and can be clearance fit with the bypass valve sleeve assembly hole of the plunger sleeve; wherein n is an integer and n≥2, and i is any integer from 1 to n.

[0006] Preferably, the lower ends of the two limiting rods are respectively located in the two limiting holes. The limiting rods not only limit the position of the support plate, but also guide the compression and extension of the spring.

[0007] Preferably, the middle part of the positioning rod has a limiting step, and the height of the upper end surface of the limiting step is lower than the height of the upper ends of the two springs, that is, when the plunger sleeve is not supported, there is a certain distance between the upper end surface of the limiting step and the bottom surface of the support plate. The limiting step can limit the lowest position of the plunger sleeve when it is placed before clamping the plunger sleeve, avoiding excessive compression of the spring.

[0008] Preferably, the above-mentioned plunger sleeve surface grinding fixture also includes a left top sleeve and a right top sleeve; the center of the left top sleeve is provided with a left top assembly hole and a left screw hole which are interconnected, the left screw hole is located at the left part of the left top sleeve, the left top sleeve is located in the left clamp body and is fixedly connected to the left clamp body; the center of the right top sleeve is provided with a right top assembly hole and a right screw hole which are interconnected, the right screw hole is located at the right part of the right top sleeve, the right top sleeve is located in the right clamp body and is fixedly connected to the right clamp body.

[0009] Preferably, the left clamping mechanism comprises a left top, a left threaded sleeve, a left nut, a left screw, a left handle and a left locking screw, the left end of the left top has an external thread and is provided with a left accommodating groove, the left nut is located in the left accommodating groove, the left top and the left threaded sleeve are located in the left top assembly hole and are clearance-matched with the left top assembly hole, the left handle is fixedly connected to one end of the left screw, the rod of the left screw is screwed with the left screw hole, the other end of the left screw passes through the left threaded sleeve and is screwed with the left nut and contacts with the bottom of the left accommodating groove, the left threaded sleeve is screwed with the left end of the left top, the left locking screw vertically passes through the left clamping body and the left top sleeve and extends into the left top assembly hole to press the left top. The left handle can control the movement of the left screw to drive the left threaded sleeve to move left and right, the left threaded sleeve drives the left top to move left and right, after moving into position, the left top is pressed by the left locking screw to ensure that the left top does not move during the processing of the plunger sleeve.

[0010] Preferably, the right clamping mechanism comprises a right top, a right threaded sleeve, a right nut, a right screw, a right handle and a right locking screw. The right end of the right top has an external thread and is provided with a right accommodating groove. The right nut is located in the right accommodating groove. The right top (16) and the right threaded sleeve are located in the right top assembly hole and are in clearance with the right top assembly hole. The right handle is fixedly connected to one end of the right screw. The rod of the right screw is screwed to the right screw hole. The other end of the right screw passes through the right threaded sleeve and is screwed to the right nut and contacts the bottom of the right accommodating groove. The right threaded sleeve is screwed to the right end of the right top. The left locking screw vertically passes through the right clamping body and the right top sleeve and extends into the right top assembly hole to press the right top. The right handle can control the movement of the right screw to drive the right threaded sleeve to move left and right. The right threaded sleeve drives the right top to move left and right. After moving into place, the right top is pressed by the right locking screw to ensure that the right top does not move during the processing of the plunger sleeve.

[0011] By supporting the two ends of the plunger sleeve with the left and right tops, the parallelism between the grinding plane and the axis center line of the plunger sleeve can be effectively ensured.

[0012] Preferably, the left clamp is fixedly connected to the left part of the base by a first fixing screw, and the right clamp is fixedly connected to the right part of the base by a second fixing screw.

[0013] Preferably, the left top sleeve is fixedly connected to the left clamp body by a third fixing screw, and the right top sleeve is fixedly connected to the right clamp body by a fourth fixing screw.

[0014] Preferably, the positioning hole is a through hole; the limiting rod assembly hole is a stepped through hole, and the upper end surface of the limiting rod contacts the stepped surface of the limiting rod assembly hole. The positioning hole is a through hole, which facilitates the positioning rod to be knocked out of the positioning hole when replacing the positioning rod. The limiting rod assembly hole is a stepped through hole, which facilitates the limiting rod to be knocked out of the limiting rod assembly hole when replacing the limiting rod.

[0015] Preferably, n=3, that is, three rows of holes are provided on the base.

[0016] The present invention has the following effects: (1) The plunger sleeve is first placed on the support plate through the cooperation of the positioning rod and the matching hole of the bypass valve sleeve. The plunger sleeve is supported by the spring and the support plate. Then, the left clamping mechanism and the right clamping mechanism cooperate to clamp the two ends of the plunger sleeve. It can be clamped quickly without additional alignment, and grinding on an ordinary surface grinder is realized. It has the characteristics of high processing efficiency, simpler and faster processing process, and lower cost.

[0017] (2) By using the left clamping mechanism, the left clamping body, the right clamping mechanism, the right clamping body and the base, the parallelism between the grinding plane of the plunger sleeve (i.e., the side plane) and the axis center line of the plunger sleeve is effectively ensured, thereby avoiding the problem of parallelism out-of-tolerance.

[0018] (3) The upper part of the positioning rod and the bypass valve sleeve matching hole of the plunger sleeve are matched to achieve positioning, which effectively ensures the verticality of the plunger sleeve grinding plane (i.e., the side plane) and its bypass valve sleeve matching hole, avoiding the problem of verticality out of tolerance.

[0019] (4) The base is provided with n rows of holes, and a certain row of holes can be used according to the actual specifications of the plunger sleeve. The positioning rod can only be inserted into a certain row of positioning holes by interference fit at one time. The plunger sleeves of different external specifications can be positioned by replacing the positioning holes. The upper outer circle of the positioning rod and the clearance of the bypass valve sleeve assembly hole of the plunger sleeve are matched. For the plunger sleeves with different diameters of the bypass valve sleeve assembly hole, only the positioning rods with different upper outer circles need to be replaced, thereby further reducing the types and quantity of plunger sleeve surface grinding fixtures, which has the advantage of reducing the manufacturing cost of the fixture.

[0020] (5) The left clamping mechanism can be moved relative to the left clamp, and the right clamping mechanism can be moved relative to the right clamp, so as to freely adjust the left and right positions. The n rows of holes opened on the base are used for positioning, which can be suitable for plunger sleeves of different lengths and specifications, and has strong versatility. According to the different apertures of the bypass valve sleeve assembly holes, the corresponding positioning rod can be selected to achieve self-positioning, which is convenient for replacement and does not require alignment. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 Schematic diagram of the structure of the plunger sleeve surface grinding fixture in an embodiment of the present invention.

[0022] Figure 2 It is a transverse cross-sectional view of the plunger sleeve surface grinding fixture in an embodiment of the present invention.

[0023] Figure 3 It is a longitudinal sectional view of the plunger sleeve surface grinding fixture in an embodiment of the present invention.

[0024] Figure 4 4 is a cross-sectional view of a support plate in an embodiment of the present invention.

[0025] Figure 5 Schematic diagram of the structure of the base in an embodiment of the present invention.

[0026] Figure 6 for Figure 5 AA section view in.

[0027] Figure 7 It is a cross-sectional view of the left top in an embodiment of the present invention.

[0028] Figure 8 It is a cross-sectional view of the right top in an embodiment of the present invention.

[0029] Fig. 9 It is a cross-sectional view of a left-hand threaded sleeve in an embodiment of the present invention.

[0030] Fig.10 It is a cross-sectional view of the left nut in the embodiment of the present invention.

[0031] Fig.11 It is a cross-sectional view of the left screw in the embodiment of the present invention.

[0032] Fig.12 Schematic diagram of the plunger set clamp in an embodiment of the present invention. DETAILED DESCRIPTION

[0033] In order to enable a more detailed understanding of the features and technical contents of the embodiments of the present invention, the implementation of the embodiments of the present invention is described in detail below in conjunction with the accompanying drawings. The attached drawings are for reference only and are not intended to limit the embodiments of the present invention.

[0034] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art to which the present invention belongs. The terms used herein are only for the purpose of describing the embodiments of the present invention and are not intended to limit the present invention.

[0035] In the following description, reference is made to “some embodiments”, which describe a subset of all possible embodiments, but it will be understood that “some embodiments” may be the same subset or different subsets of all possible embodiments and may be combined with each other without conflict.

[0036] like Figures 1 to 12 As shown, the plunger sleeve surface grinding fixture in the embodiment of the present invention includes: a base 1, a left clamp body 2 fixedly connected to the left part of the base 1, a right clamp body 3 fixedly connected to the right part of the base 1, a left clamping mechanism installed in the left clamp body 2 and capable of moving and partially extending from the left clamp body 2, a right clamping mechanism installed in the right clamp body 3 and capable of moving and partially extending from the right clamp body 3, a positioning rod 4, a support plate 5, two springs 6, two limit rods 7, a left top sleeve 8 and a right top sleeve 9. The left clamping mechanism cooperates with the right clamping mechanism to support the two ends of the plunger sleeve 26.

[0037] In some embodiments, the left clamp body 2 is fixedly connected to the left portion of the base 1 by two first fixing screws 22 , and the right clamp body 3 is fixedly connected to the right portion of the base 1 by two second fixing screws 23 .

[0038] In some embodiments, a left top sleeve 8 has a left top assembly hole and a left screw hole connected to each other at its center, the left screw hole is located at the left part of the left top sleeve 8, and the left top sleeve 8 is located in the left clamp body 2 and fixedly connected to the left clamp body 2. As an example, the left top sleeve 8 is fixedly connected to the left clamp body 2 by three third fixing screws 24.

[0039] In some embodiments, a right top sleeve 9 is provided with a right top assembly hole and a right screw hole that are interconnected, the right screw hole is located at the right part of the right top sleeve 9, and the right top sleeve 9 is located in the right clamp body 3 and is fixedly connected to the right clamp body 3. As an example, the right top sleeve 9 is fixedly connected to the right clamp body 3 by three fourth fixing screws 25.

[0040] like Figure 1 , Figure 2 , Figure 7 , Figures 9 to 11As shown, in some embodiments, the left clamping mechanism includes a left top point 10, a left threaded sleeve 11, a left nut 12, a left screw 13, a left handle 14 and a left locking screw 15. The left end portion of the left top point 10 has an external thread and is provided with a left accommodating groove 1001. The left nut 12 is located in the left accommodating groove 1001. The left top point 10 and the left threaded sleeve 11 are located in the left top point assembly hole and are clearance-matched with the left top point assembly hole. The left handle 14 is threadedly connected to one end of the left screw 13. The rod of the left screw 13 is threadedly connected to the left screw hole. The other end of the left screw 13 passes through the left threaded sleeve 11 and is threadedly connected to the left nut 12, and contacts with the bottom of the left accommodating groove 1001. The left threaded sleeve 11 is threadedly connected to the left end portion of the left top point 10. The left locking screw 15 vertically passes through the left clamping body 2 and the left top point sleeve 8 and extends into the left top point assembly hole to press the left top point 10.

[0041] When adjusting, loosen the left locking screw 15, rotate the left handle 14 to drive the left screw 13 to move, the left screw 13 rotates and moves linearly, and drives the left threaded sleeve 11 to move linearly. When the left top 10 needs to move to the right, rotate the left handle 14 clockwise to drive the left screw 13 to move, the end face of the left screw 13 contacts the left top 10, and pushes the left top 10 to move to the right; when the left top 10 needs to move to the left, rotate the left handle 14 counterclockwise to drive the left screw 13 to move, the left nut 12 connected to the left screw 13 contacts the left threaded sleeve 11, and pushes the left threaded sleeve 11 to move to the left, thereby driving the left top 10 to move to the left. After moving into place, the left top 10 is pressed by the left locking screw 15.

[0042] like Figure 1 , Figure 2 , Figure 8 As shown, in some embodiments, the right clamping mechanism includes a right top point 16, a right threaded sleeve 17, a right nut 18, a right screw 19, a right handle 20 and a right locking screw 21. The right end portion of the right top point 16 has an external thread and is provided with a right accommodating groove 161. The right nut 18 is located in the right accommodating groove 161. The right top point 16 and the right threaded sleeve 17 are located in the right top point assembly hole and are clearance-matched with the right top point assembly hole. The right handle 20 is threadedly connected to one end of the right screw 19, and the rod of the right screw 19 is threadedly connected to the right screw hole. The other end of the right screw 19 passes through the right threaded sleeve 17 and is threadedly connected to the right nut 18, and contacts with the bottom of the right accommodating groove 161. The right threaded sleeve 17 is threadedly connected to the right end portion of the right top point 16. The left locking screw 21 vertically passes through the right clamping body 3 and the right top sleeve 9 and extends into the right top point assembly hole to press the right top point 16.

[0043] When adjusting, loosen the right locking screw 21, rotate the right handle 20 to drive the right screw 19 to move, the right screw 19 rotates and moves linearly, and drives the right threaded sleeve 17 to move linearly. When the right top 16 needs to move to the left, rotate the right handle 20 counterclockwise to drive the right screw 19 to move, the end face of the right screw 19 contacts the right top 16, and pushes the right top 16 to move to the left; when the right top 16 needs to move to the right, rotate the right handle 20 clockwise to drive the right screw 19 to move, the right nut 18 connected to the right screw 19 contacts the right threaded sleeve 17, and pushes the right threaded sleeve 17 to move to the right, thereby driving the right top 16 to move to the right. After moving into place, the right top 16 is pressed by the right locking screw 21.

[0044] like Figure 1 , Figure 2 , Figure 5 , Figure 6 As shown, the base 1 is in the shape of a cuboid, and the upper and lower surfaces of the base 1 are provided with grooves, and the grooves are provided with n rows of holes, each row of holes including two limiting holes 101 and a positioning hole 102 located between the two limiting holes 101. Wherein n is an integer and n≥2. As an example, the value of n is 3.

[0045] like Figures 1 to 4 As shown, two limit rod assembly holes 51 and an avoidance hole 52 are provided on the support plate 5. The lower parts of the two springs 6 respectively extend into the two limit holes 101 in the i-th row of holes to abut against each other, and the upper ends of the two limit rods 7 are respectively interference fit with the two limit rod assembly holes 51. The middle parts and lower ends of the two limit rods 7 are respectively inserted into the two springs 6, and the lower ends of the two limit rods 7 are respectively located in the two limit holes 101. The support plate 5 is supported on the upper ends of the two springs 6, and the lower part of the positioning rod 4 is interference fit with the positioning hole 102 in the i-th row of holes. The middle part of the positioning rod 4 has a limit step 41, and the height of the upper end surface of the limit step 41 is lower than the height of the upper ends of the two springs 6. The upper part of the positioning rod 4 passes through the avoidance hole 52 and can be clearance-matched with the bypass valve sleeve assembly hole of the plunger sleeve 26 (see Fig.12 ). Wherein, i is any integer from 1 to n.

[0046] In some embodiments, the positioning hole 102 is a through hole. The limiting hole 101 is a stepped through hole, and the lower end of the spring 6 abuts against the stepped surface of the limiting hole 101. The limiting rod assembly hole 51 is a stepped through hole, and the upper end surface of the limiting rod 7 contacts the stepped surface of the limiting rod assembly hole 51.

[0047] In some embodiments, for plunger sleeves 26 of different specifications, they can be reliably positioned and clamped by adjusting the positions of the left top 10 and the right top 16, and the assembly hole of the bypass valve sleeve can be positioned by adjusting the assembly positions of the positioning rod 4 and the limit rod 7.

Claims

1. A plunger sleeve surface grinding fixture, comprising: A base (1), a left clamping body (2) fixedly connected to the left part of the base (1), a right clamping body (3) fixedly connected to the right part of the base (1), a left clamping mechanism installed in the left clamping body (2) and capable of moving and partially extending from the left clamping body (2), and a right clamping mechanism installed in the right clamping body (3) and capable of moving and partially extending from the right clamping body (3); the left clamping mechanism cooperates with the right clamping mechanism to support the two ends of the plunger sleeve; the characteristics include: further comprising a positioning rod (4), a support plate (5), two springs (6) and two limit rods (7); n rows of holes are opened on the base (1), each row of holes includes two limit holes (101) and a positioning hole (102) located between the two limit holes, and the support plate (5) is provided with a plurality of ... Two limit rod assembly holes (51) and an avoidance hole (52) are provided; the lower parts of the two springs (6) are respectively extended into the two limit holes (101) in the i-th row of holes to abut against each other; the upper ends of the two limit rods (7) are respectively interference fit with the two limit rod assembly holes (51); the middle parts and lower ends of the two limit rods (7) are respectively inserted into the two springs (6); the support plate (5) is supported on the upper ends of the two springs (6); the lower part of the positioning rod (4) is interference fit with the positioning hole (102) in the i-th row of holes; the upper part of the positioning rod (4) passes through the avoidance hole (52) and can be clearance fit with the bypass valve sleeve assembly hole of the plunger sleeve (26); wherein n is an integer and n≥2, and i is any integer from 1 to n.

2. The plunger sleeve surface grinding fixture according to claim 1, characterized in that: The lower ends of the two limiting rods (7) are respectively located in the two limiting holes (101).

3. The plunger sleeve surface grinding fixture according to claim 1, characterized in that: The middle portion of the positioning rod (4) has a limiting step (41), and the height of the upper end surface of the limiting step (41) is lower than the height of the upper ends of the two springs (6).

4. The plunger sleeve surface grinding fixture according to any one of claims 1 to 3, characterized in that: It also includes a left top sleeve (8) and a right top sleeve (9); the center of the left top sleeve (8) is provided with a left top assembly hole and a left screw hole which are interconnected, the left screw hole is located at the left part of the left top sleeve (8), the left top sleeve (8) is located in the left clamp body (2) and is fixedly connected to the left clamp body (2); the center of the right top sleeve (9) is provided with a right top assembly hole and a right screw hole which are interconnected, the right screw hole is located at the right part of the right top sleeve (9), the right top sleeve (9) is located in the right clamp body (3) and is fixedly connected to the right clamp body (3).

5. The plunger sleeve surface grinding fixture according to claim 4, characterized in that: The left clamping mechanism comprises a left top end (10), a left threaded sleeve (11), a left nut (12), a left screw rod (13), a left handle (14) and a left locking screw (15). The left end portion of the left top end (10) has an external thread and is provided with a left receiving groove (1001). The left nut (12) is located in the left receiving groove (1001). The left top end (10) and the left threaded sleeve (11) are located in the left top end assembly hole and are clearance-matched with the left top end assembly hole. The left handle (14 ) is fixedly connected to one end of the left screw rod (13), the rod portion of the left screw rod (13) is screwed to the left screw hole, the other end of the left screw rod (13) passes through the left threaded sleeve (11) and is screwed to the left nut (12), and contacts the bottom of the left accommodating groove (1001), the left threaded sleeve (11) is screwed to the left end portion of the left top (10), and the left locking screw (15) vertically passes through the left clamp body (2) and the left top sleeve (8) and extends into the left top assembly hole to press the left top (10).

6. The plunger sleeve surface grinding fixture according to claim 4, characterized in that: The right clamping mechanism comprises a right top end (16), a right threaded sleeve (17), a right nut (18), a right screw rod (19), a right handle (20) and a right locking screw (21). The right end portion of the right top end (16) has an external thread and is provided with a right receiving groove (161). The right nut (18) is located in the right receiving groove (161). The right top end (16) and the right threaded sleeve (17) are located in the right top end assembly hole and are clearance-matched with the right top end assembly hole. The right handle (20) The right screw rod (19) is fixedly connected to one end of the right screw rod (19), the rod of the right screw rod (19) is screwed to the right screw hole, the other end of the right screw rod (19) passes through the right threaded sleeve (17) and is screwed to the right nut (18), and contacts the bottom of the right receiving groove (161), the right threaded sleeve (17) is screwed to the right end of the right top (16), and the left locking screw (21) vertically passes through the right clamp body (3) and the right top sleeve (9) and extends into the right top assembly hole to press the right top (16).

7. The plunger sleeve surface grinding fixture according to claim 4, characterized in that: The left clamp body (2) is fixedly connected to the left part of the base (1) by means of a first fixing screw (22), and the right clamp body (3) is fixedly connected to the right part of the base (1) by means of a second fixing screw (23).

8. The plunger sleeve surface grinding fixture according to claim 4, characterized in that: The left top sleeve (8) is fixedly connected to the left clamp body (2) via a third fixing screw (24), and the right top sleeve (9) is fixedly connected to the right clamp body (3) via a fourth fixing screw (25).

9. The plunger sleeve surface grinding fixture according to claim 4, characterized in that: The positioning hole (102) is a through hole; the limiting rod assembly hole (51) is a stepped through hole, and the upper end surface of the limiting rod (7) is in contact with the stepped surface of the limiting rod assembly hole (51).

10. The plunger sleeve surface grinding fixture according to claim 4, characterized in that: Said n=3.

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