Fixing device for grinding inner cavity of high-pressure pump shell
By designing a fixing device with a reset spring and a rubber block buffer structure, the surface quality problem caused by vibration during the grinding process of the high-pressure pump housing cavity was solved, achieving high precision and high efficiency grinding effect, and ensuring the stable positioning and machining accuracy of the housing.
Patent Information
- Application Number
- CN202520583117.0
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-03-31
- Publication Date
- 2026-02-17
- Estimated Expiration
- 2035-03-31
AI Technical Summary
In the existing high-pressure pump housing internal cavity grinding process, the vibration isolation effect of the fixing device is poor, resulting in uneven surface quality, dimensional deviation and reduced accuracy of the housing, which affects production efficiency and product quality.
It employs a clamping and fixing mechanism, a positioning pressure plate structure, a housing positioning mechanism, an elastic support structure, a support base, and an end positioning mechanism, combined with a reset spring, rubber blocks, and a damping structure, designed to buffer and uniformly clamp, ensuring stable positioning of the workpiece and absorbing vibration and impact forces.
It effectively reduces the impact of vibration and shock on the shell surface, improves grinding accuracy and surface finish, reduces mechanical wear, shortens workpiece loading and unloading time, and ensures micron-level machining accuracy and efficient production.
Smart Images
Figure CN223917641U_ABST
Abstract
Description
Technical Field
[0001] This utility model belongs to the field of machining technology, and in particular relates to a fixing device for grinding the inner cavity of a high-pressure pump housing. Background Technology
[0002] Grinding is a crucial step in the production of the high-pressure pump housing's inner cavity. It primarily improves the surface finish and dimensional accuracy of the housing's inner wall, which is essential for the pump's performance and lifespan. High-pressure pumps require efficient hydrodynamics and sealing during operation, necessitating highly precise dimensional requirements and surface finishes for the housing's inner cavity. Grinding effectively removes minor protrusions and machining marks left from the initial processing, ensuring the roundness, concentricity, and surface quality of the inner cavity. The housing must be securely fixed during grinding to prevent any movement or vibration. This is critical for maintaining grinding accuracy and consistency; otherwise, surface unevenness or dimensional deviations may occur. Poor fixing during the grinding of the high-pressure pump housing's inner cavity can cause vibration to be transmitted to the workpiece. Vibration affects the contact stability between the grinding tool and the workpiece. Due to the poor vibration isolation effect of housing fixing devices in related technologies, problems such as uneven surface quality, dimensional deviations, and reduced machining accuracy occur in the machined housing surface. Good fixing reduces rework rates, improves production efficiency, and ensures that the final product meets design and quality standards. Summary of the Invention
[0003] In view of this, the present invention aims to at least partially solve one of the related technical problems.
[0004] To achieve the above objectives, the technical solution of this utility model is implemented as follows:
[0005] A fixing device for grinding the inner cavity of a high-pressure pump housing includes a clamping and fixing mechanism, a positioning pressure plate structure, a housing positioning mechanism, two elastic support structures, two support bases, and two end positioning mechanisms.
[0006] The two support bases and the two end positioning mechanisms are symmetrically arranged front and back. The end positioning mechanisms are used to position the threaded holes at the ends of the high-pressure pump housing.
[0007] The support base has a stepped surface in the middle, and the end of the housing positioning mechanism is connected to the stepped surface. The housing positioning mechanism has a buffer structure.
[0008] The inner side of the support base is provided with a conical positioning surface that can cooperate with the high-pressure pump housing. The conical positioning surface is provided with a groove, and a connecting structure is provided in the groove.
[0009] Each of the support bases is provided with a corresponding elastic support structure at its top. The top of the elastic support structure is connected to the outer end of the positioning pressure plate structure. The inner end of the positioning pressure plate structure can press the end face of the high-pressure pump housing used for engagement.
[0010] The outer middle part of the positioning pressure plate structure is connected to the clamping and fixing mechanism.
[0011] Furthermore, the housing positioning mechanism includes a positioning plate, two first slide rods, and two rubber blocks. The positioning plate has a positioning groove in the middle, which can cooperate with the high-pressure pump housing. The front and rear ends of the positioning plate are connected to the top of a first slide rod. The bottom of the first slide rod slides in cooperation with the stepped surface through a damping structure. The rubber blocks are disposed on the first slide rods and are located between the positioning plate and the stepped surface.
[0012] Furthermore, the positioning pressure plate structure includes a horizontal plate, a pressing plate, and two connecting plates. The front and rear ends of the horizontal plate are each connected to an elastic support structure. The horizontal plate is connected to the pressing plate through the two connecting plates. The pressing plate is used to press the end face of the high-pressure pump housing for engagement.
[0013] Furthermore, the lower end face of the clamping plate is provided with an anti-slip pad.
[0014] Furthermore, the elastic support structure includes a second slide rod, a pressure plate, a fixing nut, and a return spring. The bottom of the second slide rod slides in conjunction with the top end face of the support base. The pressure plate and the fixing nut are located at the top of the second slide rod. The fixing nut is used to limit the pressure plate. One end of the return spring abuts against the top end face of the support base, and the other end abuts against the positioning pressure plate structure. The pressure plate and the fixing nut are both located above the positioning pressure plate structure.
[0015] Furthermore, the clamping and fixing mechanism includes a crossbar, a locking nut, a limiting block, and a locking screw. The front and rear ends of the crossbar are respectively connected to a support base. The locking screw passes through the cross plate and the crossbar. The limiting block is set at the top of the locking screw. The bottom of the locking screw cooperates with the locking nut.
[0016] Furthermore, the clamping and fixing mechanism includes a crossbar and a clamping cylinder. The front and rear ends of the crossbar are respectively connected to a support base. The output rod of the clamping cylinder passes through the crossbar and is connected to the cross plate.
[0017] Furthermore, the connection structure includes two connecting bolts, which are arranged side by side in the slot, and the support base is connected to the operating table through the two connecting bolts.
[0018] Furthermore, the end positioning mechanism includes a positioning base, a positioning platform, a spring-type positioning pin, and a fixing plate. The fixing plate is disposed at the bottom of the positioning base, the positioning platform is disposed on the inner end face of the positioning base, and the spring-type positioning pin is disposed on the upper end face of the positioning platform.
[0019] Compared with the prior art, the fixing device for grinding the inner cavity of a high-pressure pump housing described in this utility model has the following advantages:
[0020] 1. The return spring design effectively absorbs the vibration and impact forces generated during grinding. Through the spring's compression and rebound characteristics, it reduces the instantaneous stress caused by rigid contact. This buffering effect protects the high-pressure pump housing surface from scratches and reduces mechanical wear on the device itself, extending the service life of critical components. When the clamping state is released, the restoring force of the return spring drives the pressure plate and second slide bar to automatically reset, significantly shortening the auxiliary time for workpiece loading and unloading. The two symmetrically arranged elastic support structures form a force couple balance through the cross plate, effectively counteracting the lateral cutting forces generated during grinding. The spring's load-sharing characteristics ensure a more uniform pressure distribution, preventing the housing from shifting or twisting during processing and ensuring that grinding accuracy reaches the micron level.
[0021] 2. The positioning groove in the center of the positioning plate matches the outer contour of the high-pressure pump housing, ensuring rapid centering of the workpiece and reducing manual adjustment time. The geometric accuracy of the groove directly guarantees the alignment of the housing axis with the grinding tool, preventing machining misalignment. The rubber block, as a primary buffer, absorbs the high-frequency vibration energy during grinding through its own compression deformation, reducing the impact force transmitted to the support base and protecting the surface finish of the housing. The damping structure, as a secondary buffer, prevents machining chatter caused by resonance and improves the surface roughness of the ground surface.
[0022] 3. When the spring-loaded locating pin is inserted into the threaded hole at the end of the housing, the spring's extension and contraction automatically compensate for hole position deviations. The tapered head of the pin guides the threaded hole to quickly align, avoiding positioning errors caused by manual adjustment. The repeatability accuracy can reach ±0.02mm. The spring structure of the locating pin allows for slight axial and radial movement (2-3mm axial movement, 0.5-1mm radial movement), eliminating over-constraint between the workpiece and the fixture. It is particularly suitable for housings with casting burrs or slight deformation of the threaded hole. The compression stroke of the spring-loaded locating pin works in conjunction with the weight of the housing. During installation, only the end of the housing needs to be pressed down onto the locating table, and the spring automatically completes the pin retraction and insertion action. The clamping time on one side is less than 5 seconds. Attached Figure Description
[0023] The accompanying drawings, which form part of this utility model, are used to provide a further understanding of the utility model. The illustrative embodiments of the utility model and their descriptions are used to explain the utility model and do not constitute an undue limitation of the utility model. In the drawings:
[0024] Figure 1 This is a schematic diagram of a fixing device for grinding the inner cavity of a high-pressure pump housing, as described in an embodiment of the present invention.
[0025] Figure 2 This is a schematic diagram of the housing positioning mechanism described in an embodiment of the present utility model;
[0026] Figure 3 This is a schematic diagram of the pressing and fixing mechanism described in an embodiment of the present utility model;
[0027] Figure 4 This is a schematic diagram of the connection structure described in an embodiment of the present utility model.
[0028] Explanation of reference numerals in the attached figures:
[0029] 100. Support base; 110. Conical positioning surface; 120. Stepped surface; 200. Elastic positioning structure; 210. Connecting plate; 220. Horizontal plate; 230. Pressing plate; 300. Positioning plate; 310. Rubber block; 320. First sliding rod; 330. Positioning groove; 400. Positioning base; 410. Positioning platform; 420. Fixing plate; 500. Spring-type positioning pin; 600. Horizontal bar; 610. Locking screw; 620. Locking nut; 630. Limiting block; 710. Groove; 720. Connecting bolt. Detailed Implementation
[0030] It should be noted that, unless otherwise specified, the embodiments and features described in these embodiments can be combined with each other.
[0031] In the description of this utility model, it should be understood that the terms "center," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicating orientation or positional relationships based on the orientation or positional relationships shown in the accompanying drawings, are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. Furthermore, the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, features defined with "first," "second," etc., may explicitly or implicitly include one or more of that feature. In the description of this utility model, unless otherwise stated, "a plurality of" means two or more.
[0032] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.
[0033] The present invention will now be described in detail with reference to the accompanying drawings and embodiments.
[0034] A fixing device for grinding the inner cavity of a high-pressure pump housing, such as Figure 1 As shown, the system includes a clamping and fixing mechanism, a positioning pressure plate structure, a housing positioning mechanism, two elastic support structures, two support bases 100, and two end positioning mechanisms. The two support bases 100 and the two end positioning mechanisms are symmetrically arranged front and rear. The end positioning mechanisms are used to position the threaded holes at the ends of the high-pressure pump housing. A stepped surface 120 is provided in the middle of the support base 100, and the end of the housing positioning mechanism is connected to the stepped surface 120. The housing positioning mechanism has a buffer structure. A conical positioning surface 110 that can cooperate with the high-pressure pump housing is provided on the inner side of the support base 100. The conical positioning surface 110 has a groove 710, and a connecting structure is provided within the groove 710. The connecting structure includes two connecting bolts 720, which are arranged side-by-side within the groove 710. The support base 100 is connected to the operating table via the two connecting bolts 720.
[0035] Each support base 100 has a corresponding elastic support structure on its top. The top of the elastic support structure is connected to the outer end of the positioning pressure plate structure. The inner end of the positioning pressure plate structure can press the end face of the high-pressure pump housing used for engagement. The middle of the outer side of the positioning pressure plate structure is connected to the pressing and fixing mechanism.
[0036] like Figure 2As shown, the housing positioning mechanism includes a positioning plate 300, two first slide rods 320, and two rubber blocks 310. The positioning plate 300 has a positioning groove 330 in its middle, which can mate with the high-pressure pump housing. The front and rear ends of the positioning plate 300 are connected to the top of one of the first slide rods 320. The bottom of the first slide rod 320 slides against a stepped surface 120 via a damping structure. The rubber blocks 310 are positioned on the first slide rods 320 between the positioning plate 300 and the stepped surface 120. The stepped surface 120 has a first sliding hole that mates with the first slide rod 320. A damping rod is installed in the first sliding hole, and the top of the damping rod is connected to the bottom of the first slide rod 320. The positioning groove 330 in the middle of the positioning plate 300 matches the outer contour of the high-pressure pump housing, ensuring rapid centering of the workpiece and reducing manual adjustment time. The geometric accuracy of the groove directly ensures the alignment of the housing axis with the grinding tool, preventing machining misalignment. Rubber block 310 serves as the primary buffer medium, absorbing high-frequency vibration energy during the grinding process through its own compression and deformation, reducing the impact force transmitted to the support base 100, and protecting the surface finish of the housing. The damping structure serves as the secondary buffer, preventing machining chatter marks caused by resonance and improving the surface roughness of the ground surface.
[0037] like Figure 3 As shown, the positioning pressure plate structure includes a horizontal plate 220, a pressure plate 230, and two connecting plates 210. A spring-loaded support structure is connected to both the front and rear ends of the horizontal plate 220. The horizontal plate 220 is connected to the pressure plate 230 via the two connecting plates 210. The pressure plate 230 is used to press the end face of the high-pressure pump housing used for engagement. An anti-slip pad is provided on the lower end face of the pressure plate 230.
[0038] The elastic support structure includes a second slide rod, a pressure plate, a fixing nut, and a return spring. The bottom of the second slide rod slides against the top surface of the support base 100. The pressure plate and fixing nut are located at the top of the second slide rod. The fixing nut is used to limit the pressure plate. One end of the return spring abuts against the top surface of the support base 100, and the other end abuts against the positioning pressure plate structure. Both the pressure plate and the fixing nut are located above the positioning pressure plate structure. The top of the support base 100 has a second sliding hole. The bottom of the second slide rod slides against the second sliding hole through a limiting slider. One end of the return spring abuts against the top surface of the support base 100, and the other end abuts against the horizontal plate 220. The second slide rod passes through the horizontal plate 220, and the pressure plate and fixing nut are both located above the horizontal plate 220. The design of the return spring effectively absorbs the vibration and impact force generated during the grinding process. Through the compression and rebound characteristics of the spring, it reduces the instantaneous stress caused by rigid contact. The buffering effect protects the surface of the high-pressure pump housing from scratches and reduces the mechanical wear of the device itself, extending the service life of key components. When the clamping state is released, the restoring force of the return spring drives the pressure plate and the second slide bar to automatically reset, significantly shortening the auxiliary time for workpiece loading and unloading. The two symmetrically arranged elastic support structures form a force couple balance through the cross plate 220, effectively counteracting the lateral cutting forces generated during grinding. The load-sharing characteristics of the springs ensure a more uniform pressure distribution, preventing the housing from shifting or twisting during processing and ensuring that grinding accuracy reaches the micron level.
[0039] The clamping and fixing mechanism includes a crossbar 600, a locking nut 620, a limiting block 630, and a locking screw 610. A support base 100 is connected to the front and rear ends of the crossbar 600. The locking screw 610 passes through the cross plate 220 and the crossbar 600. The limiting block 630 is set at the top of the locking screw 610. The bottom of the locking screw 610 cooperates with the locking nut 620.
[0040] The end positioning mechanism includes a positioning base 400, a positioning platform 410, a spring-loaded positioning pin 500, and a fixing plate 420. The fixing plate 420 is located at the bottom of the positioning base 400, the positioning platform 410 is located on the inner end face of the positioning base 400, and the spring-loaded positioning pin 500 is located on the upper end face of the positioning platform 410. When the spring-loaded positioning pin 500 is inserted into the threaded hole at the end of the housing, the spring's extension and contraction automatically compensate for hole position deviations. The tapered head of the pin guides the threaded hole to quickly align, avoiding positioning errors caused by manual adjustment, and the repeatability accuracy can reach ±0.02mm. The spring structure of the positioning pin allows for slight axial and radial floats (axial float 2-3mm, radial float 0.5-1mm), eliminating over-constraint between the workpiece and the fixture, and is particularly suitable for housings with casting burrs or slight deformation of the threaded hole. The compression stroke of the spring-type locating pin 500 works in conjunction with the weight of the housing. During installation, the end of the housing only needs to be pressed down to the locating platform 410, and the spring automatically completes the pin retraction-insertion action. The clamping time on one side is less than 5 seconds.
[0041] The above are merely preferred embodiments of the present utility model and are not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model shall be included within the protection scope of the present utility model.
Claims
1. A fixture for grinding the inner cavity of a high-pressure pump housing, characterized by: The supporting base (100) and the end positioning mechanism are symmetrically arranged front and back, and the end positioning mechanism is used for positioning the threaded hole of the end of the high-pressure pump shell. The middle part of the supporting base (100) is provided with a stepped surface (120), the end of the shell positioning mechanism is connected with the stepped surface (120), and the shell positioning mechanism has a buffer structure. The inner side of the supporting base (100) is provided with a conical positioning surface (110) capable of cooperating with the high-pressure pump shell, the conical positioning surface (110) is provided with a notch (710), and the notch (710) is provided with a connecting structure. The top of each supporting base (100) is provided with one elastic support structure, the top of the elastic support structure is connected with the outer side end of the positioning pressing plate structure, and the inner side end of the positioning pressing plate structure can press the end surface of the high-pressure pump shell for engagement. The outer side middle part of the positioning pressing plate structure is connected with the pressing fixing mechanism. The shell positioning mechanism comprises a positioning plate (300), two first sliding rods (320) and two rubber blocks (310), the middle part of the positioning plate (300) is provided with a positioning groove (330), the positioning groove (330) can cooperate with the high-pressure pump shell, the front and rear ends of the positioning plate (300) are connected with the top of one first sliding rod (320), the bottom of the first sliding rod (320) is slidably connected with the stepped surface (120) through a damping structure, the rubber block (310) is arranged on the first sliding rod (320), and the rubber block (310) is located between the positioning plate (300) and the stepped surface (120).
2. A fixture for grinding the inner cavity of a high-pressure pump housing according to claim 1, characterized in that: The positioning pressing plate structure comprises a cross plate (220), a pressing plate (230) and two connecting plates (210), the front and rear ends of the cross plate (220) are connected with one elastic support structure, the cross plate (220) is connected with the pressing plate (230) through the two connecting plates (210), and the pressing plate (230) is used for pressing the end surface of the high-pressure pump shell for engagement.
3. A fixture for grinding the inner cavity of a high-pressure pump housing according to claim 1, characterized in that: The lower end surface of the pressing plate (230) is provided with a non-slip pad.
4. A fixture for grinding the inner cavity of a high-pressure pump housing according to claim 3, characterized in that: The elastic support structure comprises a second sliding rod, a pressing piece, a fixing nut and a return spring, the bottom of the second sliding rod is slidably connected with the top end surface of the supporting base (100), the pressing piece and the fixing nut are arranged on the top of the second sliding rod, the fixing nut is used for limiting the pressing piece, one end of the return spring abuts against the top end surface of the supporting base (100), and the other end abuts against the positioning pressing plate structure, and the pressing piece and the fixing nut are located above the positioning pressing plate structure.
5. A fixture for grinding the inner cavity of a high-pressure pump housing according to any one of claims 1 to 4, characterized in that: 6. A fixture for grinding the interior of a high pressure pump housing according to claim 5, wherein: The compression fixing mechanism comprises a crossbar (600), a locking nut (620), a limiting block (630) and a locking screw (610), the front and rear ends of the crossbar (600) are connected with one support base (100) respectively, the locking screw (610) penetrates through the crossbar (600) and the horizontal plate (220), the limiting block (630) is arranged on the top of the locking screw (610), and the bottom of the locking screw (610) is matched with the locking nut (620).
7. A fixture for grinding the interior of a high pressure pump housing according to claim 5, wherein: The compression fixing mechanism comprises a crossbar (600) and a compression cylinder, the front and rear ends of the crossbar (600) are connected with one support base (100) respectively, and the output rod of the compression cylinder penetrates through the crossbar (600) and is connected with the horizontal plate (220).
8. A fixture for grinding the interior of a high pressure pump housing according to claim 5, wherein: The connecting structure comprises two connecting bolts (720), the two connecting bolts (720) are arranged in the slot (710) in parallel, and the support base (100) is connected with the operation table through the two connecting bolts (720).
9. A fixture for grinding the interior of a high pressure pump housing according to claim 5, wherein: The end positioning mechanism comprises a positioning base (400), a positioning table (410), a spring type positioning pin (500) and a fixing plate (420), the fixing plate (420) is arranged on the bottom of the positioning base (400), the positioning table (410) is arranged on the inner side end face of the positioning base (400), and the spring type positioning pin (500) is arranged on the upper end face of the positioning table (410).