CN219542319U

CN219542319U - Hydraulic pump end cover adds clamping apparatus

Info

Publication number: CN219542319U
Application number: CN202320386383.5U
Authority: CN
Inventors: 潘倩倩; 李广田; 王樱达; 王才成
Original assignee: Weichai Power Co Ltd
Current assignee: Weichai Power Co Ltd
Priority date: 2023-02-27
Filing date: 2023-02-27
Publication date: 2023-08-18
Anticipated expiration: 2033-02-27

Abstract

The utility model discloses a hydraulic pump end cover machining clamp which comprises a clamp base body, wherein a central through hole is formed in the middle of the clamp base body, a first pressing unit and a second pressing unit are distributed around the central through hole, a hole positioning unit is arranged in the central through hole and comprises a positioning taper pin and a spring, the positioning taper pin is in sliding fit with the central through hole, one end of the spring abuts against the positioning taper pin to support the positioning taper pin to slide along the central through hole, the positioning taper pin is provided with a conical surface, the conical surface is used for being matched with a distribution groove of a workpiece to position the workpiece on the clamp base body, the first pressing unit can press the workpiece on the clamp base body, and the second pressing unit can limit the workpiece to rotate around the positioning taper pin. The hydraulic pump end cover machining clamp disclosed by the utility model has the advantages of accurate clamping and positioning, stable workpiece machining, stable post-process machining precision, product quality and yield improvement, simple structure, convenience in installation, manufacture and operation, high practicality and economic benefit, and suitability for popularization and application.

Description

Hydraulic pump end cover adds clamping apparatus

Technical Field

The utility model relates to the technical field of machining equipment, in particular to a hydraulic pump end cover machining clamp.

Background

The hydraulic pump is a power driving element for providing pressurized liquid for a hydraulic transmission system, and the dimensional accuracy and the form and position tolerance of each part of the hydraulic pump are very strict in the production process of the hydraulic pump. The hydraulic pump is internally provided with a transmission shaft, a plunger, a sloping cam plate and other various hydraulic transmission parts, so as to meet the installation requirement, the shape of the end cover of the hydraulic pump is mostly irregular, the clamping difficulty in the end cover processing process is greatly increased, as is well known, the end cover is positioned by adopting a taper pin and bearing hole positioning mode by a conventional clamp for processing the end cover of the hydraulic pump, but the blank of the bearing hole of the end cover workpiece is deformed greatly, the machining allowance is uneven and poor in consistency, the workpiece cannot be accurately positioned by the conventional clamp, the positioning error is larger, the follow-up position inconsistency of a joint surface, a valve core hole, a kidney slot and the like is caused, the deviation occurs, the wall thickness of an orifice is uneven, the processing precision is influenced, and the product yield and the usability of the workpiece are influenced. In addition, when the workpiece is installed into the fixture, the fixture and the positions of all positioning surfaces on the workpiece are required to be aligned manually before the fixture is positioned, the positioning inaccuracy can lead to the deviation of the machining position, and the quality of the product is unqualified. The workpiece is easy to collide with parts on the clamp in the process of placing the workpiece towards the clamp, so that the workpiece is worn or even damaged.

Disclosure of Invention

The utility model provides a hydraulic pump end cover machining clamp which aims to solve at least one of the technical problems.

The technical scheme adopted by the utility model is as follows:

the utility model provides a hydraulic pump end cover adds clamping apparatus, includes the anchor clamps base member, the middle part of anchor clamps base member is equipped with central through-hole, the distribution all around of central through-hole is provided with first and second and compresses tightly the unit, install hole positioning unit in the central through-hole, hole positioning unit includes locating taper pin and spring, locating taper pin with central through-hole sliding fit, the one end of spring with locating taper pin offsets in order to support locating taper pin follows central through-hole slides, locating taper pin has the conical surface, the conical surface is used for with the joining in marriage the chute cooperation of work piece in order to be located the anchor clamps base member with the work piece compress tightly in the anchor clamps base member, the second compresses tightly the unit can restrict the work piece around locating taper pin rotates.

The hydraulic pump end cover processing clamp provided by the utility model has the following additional technical characteristics:

one end of the positioning taper pin is a positioning end, the positioning end is exposed out of the central through hole, a plurality of positioning claws are convexly arranged at the positioning end, the positioning claws are arranged at intervals along the circumferential direction of the positioning taper pin, and the conical surface is formed on the positioning claws.

The locating end is provided with four locating claws, and the four locating claws are uniformly arranged along the circumferential direction of the locating taper pin.

The positioning taper pin is provided with a shaft hole, a positioning hole shoulder is arranged in the shaft hole, and the spring stretches into the shaft hole and is matched with the positioning hole shoulder in a stop mode; or, a positioning shaft shoulder is arranged on the outer side of the positioning taper pin, and the spring is sleeved on the positioning taper pin and matched with the positioning shaft shoulder in a stop mode.

The lateral part of locating taper pin is equipped with waist type groove, locating taper pin passes through the round pin with waist type groove's cooperation is limited in the center through-hole.

The hydraulic pump end cover machining clamp further comprises a pre-compression unit, the pre-compression unit comprises a guide seat and a ball head support fixed on the guide seat, the guide seat is fixed on the clamp base body, and the pre-compression unit abuts against a workpiece through the ball head support to limit the workpiece to move along the radial direction of the central through hole.

The hydraulic pump end cover machining fixture comprises a plurality of first compression units and a plurality of pre-compression units, wherein the first compression units and the pre-compression units are alternately arranged along the circumferential direction of the central through hole.

The first pressing unit is set to be a lever oil cylinder, the lever oil cylinder comprises a first oil cylinder body and a first pressing plate, and the first oil cylinder body drives the first pressing plate to press the workpiece.

The clamp base body is fixedly provided with a supporting plate, and the first pressing plate tightly presses the workpiece on the supporting plate.

The second pressing unit is arranged to be a corner cylinder, the corner cylinder comprises a second oil cylinder body and a second pressing plate, and the second oil cylinder body drives the second pressing plate to prop against the workpiece so as to limit the workpiece to rotate around the positioning taper pin.

By adopting the technical scheme, the utility model has the following technical effects:

in the hydraulic pump end cover processing clamp provided by the utility model, the hole positioning unit is matched with the distribution groove of the hydraulic pump end cover workpiece to realize accurate and reliable positioning of the workpiece, namely, the distribution groove of the hydraulic pump end cover workpiece is used as a positioning reference, in other words, the position tolerance reference of the distribution groove is directly used as the positioning reference, when the diameter of a certain section of the conical surface of the positioning taper pin is the same as the diameter of the distribution groove, the positioning position is the same as the positioning position of the distribution groove, the workpiece can be accurately positioned, the technical problem that the positioning error is overlarge due to the deformation of a blank bearing hole during the positioning through the bearing hole in the prior art is solved, the processing precision of the subsequent working procedure is ensured, and the product yield and usability of the workpiece are further ensured; secondly, on the basis that the hole positioning unit accurately and reliably positions the workpiece, the first pressing unit is used for pressing and limiting the workpiece and the second pressing unit is used for limiting the angle direction of the workpiece, so that the stability and reliability of clamping the workpiece by the clamp are ensured, the positioning precision of the workpiece can be effectively improved, and the machining precision of the workpiece is ensured; in addition, the fixture provided by the utility model has the advantages of simple integral structure, convenience in installation, manufacture and operation, capability of realizing quick and accurate positioning and clamping of workpieces, improvement of product quality and production efficiency, and improvement of product performance, so that the fixture has high practicality and economic benefit, and is suitable for popularization and application.

Drawings

The accompanying drawings, which are included to provide a further understanding of the utility model and are incorporated in and constitute a part of this specification, illustrate embodiments of the utility model and together with the description serve to explain the utility model and do not constitute a limitation on the utility model. In the drawings:

FIG. 1 is a schematic diagram of a hydraulic pump end cap machining fixture provided by the present utility model;

FIG. 2 is a schematic diagram of a positioning taper pin according to the present utility model;

FIG. 3 is a schematic diagram of a positioning taper pin according to the second embodiment of the present utility model;

fig. 4 is a cross-sectional view of the locating taper pin provided by the utility model.

Reference numerals:

1, a clamp base body;

2 a first compression unit, a first oil cylinder body, a first pressing plate and a second pressing plate;

3 a second compression unit, a second oil cylinder body, a second pressing plate and a second pressing plate;

4 positioning taper pins, 41 taper surfaces, 42 positioning clamping jaws, 43 shaft holes, 44 positioning hole shoulders and 45 waist-shaped grooves;

5 a sequence valve;

6 an accumulator;

7, a pressure gauge;

8 precompression units, 81 guide seats and 82 ball head supports;

9 supporting plates.

Detailed Description

In order to more clearly illustrate the general inventive concept, a detailed description is given below by way of example with reference to the accompanying drawings.

In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present utility model, however, the present utility model may be practiced in other ways than those described herein, and therefore the scope of the present utility model is not limited to the specific embodiments disclosed below.

In addition, in the description of the present utility model, it should be understood that the terms "top", "bottom", "inner", "outer", "axial", "radial", "circumferential", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, are merely for convenience in describing the present utility model and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present utility model.

In the present utility model, unless explicitly specified and limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally formed; the device can be mechanically connected, electrically connected and communicated; can be directly connected or indirectly connected through an intermediate medium, and can be communicated with the inside of two elements or the interaction relationship of the two elements. The specific meaning of the above terms in the present utility model can be understood by those of ordinary skill in the art according to the specific circumstances.

In the present utility model, unless expressly stated or limited otherwise, a first feature "up" or "down" a second feature may be the first and second features in direct contact, or the first and second features in indirect contact via an intervening medium. In the description of the present specification, a description referring to terms "one embodiment," "some embodiments," "examples," "specific examples," or "some examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present utility model. In this specification, schematic representations of the above terms are not necessarily directed to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

In the embodiment of the utility model, a hydraulic pump end cover machining fixture is provided, and for convenience of explanation and understanding, the following matters are described on the basis of the structure of the illustrated product. It will of course be appreciated by those skilled in the art that the above-described construction is provided as a specific example and illustrative only and is not intended to constitute a specific limitation on the scope of the utility model.

As shown in fig. 1 and 2, a hydraulic pump end cover machining fixture comprises a fixture base body 1, a central through hole is formed in the middle of the fixture base body 1, a first compression unit 2 and a second compression unit 3 are distributed around the central through hole, a hole positioning unit is installed in the central through hole and comprises a positioning taper pin 4 and a spring (not shown in the drawing), the positioning taper pin 4 is in sliding fit with the central through hole, one end of the spring abuts against the positioning taper pin 4 to support the positioning taper pin 4 to slide along the central through hole, the positioning taper pin 4 is provided with a conical surface 41, the conical surface 41 is used for being matched with a distribution groove of a workpiece to position the workpiece on the fixture base body 1, the first compression unit 2 can compress the workpiece on the fixture base body 1, and the second compression unit 3 can limit the workpiece to rotate around the positioning taper pin 4.

In the hydraulic pump end cover machining clamp provided by the utility model, the hole positioning unit is matched with the distribution groove of the hydraulic pump end cover workpiece to realize accurate and reliable positioning of the hydraulic pump end cover workpiece, namely, the distribution groove of the hydraulic pump end cover workpiece is used as a positioning reference, in other words, the position tolerance reference of the distribution groove is directly used as the positioning reference, when the diameter of a certain section of the conical surface 41 of the positioning taper pin 4 is the same as the diameter of the distribution groove, the positioning position is the same as the positioning position of the workpiece, the workpiece can be accurately positioned, the technical problem of overlarge positioning error caused by deformation of a blank bearing hole during positioning through the bearing hole is solved, the machining precision of the subsequent working procedure is ensured, and the product yield and usability of the workpiece are further ensured; secondly, on the basis that the hole positioning unit accurately and reliably positions the workpiece, the clamping stability and reliability of the clamp on the workpiece are ensured by the compression limit of the first compression unit 2 on the workpiece and the angular limit of the second compression unit 3 on the workpiece, so that the positioning precision of the workpiece can be effectively improved, and the machining precision of the workpiece is ensured; in addition, the fixture provided by the utility model has the advantages of simple integral structure, convenience in installation, manufacture and operation, capability of realizing quick and accurate positioning and clamping of workpieces, improvement of product quality and production efficiency, and improvement of product performance, so that the fixture has high practicality and economic benefit, and is suitable for popularization and application.

When the fixture provided by the utility model is used, a hydraulic pump end cover workpiece with a distribution groove is sleeved at the outer end of a positioning taper pin 4, the distribution groove is matched with a conical surface 41, then the workpiece is pressed to move towards a fixture base body 1 to a preset position, the positioning taper pin 4 transmits force to a spring when the workpiece is pressed to the positioning taper pin 4, the spring is compressed under the stress, so that a reaction force is generated, the reaction force acts on the workpiece through the positioning taper pin 4, when the workpiece is pressed to the preset position, the spring is compressed to a preset length, finally the workpiece is pressed by using a first pressing unit 2 and a second pressing unit 3, and when the workpiece is processed and taken away from the fixture base body 1, the positioning taper pin 4 is reset by the spring.

Specifically, as shown in fig. 1, the hydraulic pump end cover processing clamp provided by the utility model can also be provided with a sequence valve 5, an energy accumulator 6, a pressure gauge 7 and other components on a clamp base body 1 to realize functions of oil supply, pressure maintaining, pressure display and the like.

Regarding the specific structure of the locating taper pin 4, as a preferred embodiment of the present utility model, as shown in fig. 2 to 4, one end of the locating taper pin 4 may be a locating end, the locating end is exposed outside the central through hole, the locating end is convexly provided with a plurality of locating claws 42, the plurality of locating claws 42 are arranged at intervals along the circumferential direction of the locating taper pin 4, and the tapered surface 41 is formed on the locating claws 42. Specifically, one end of the positioning taper pin 4 with a cylindrical structure can be inserted into the central through hole to realize sliding fit with the central through hole, and the positioning end is exposed on one side of the clamp base 1 for positioning a workpiece so that the positioning groove on the workpiece is matched with the positioning taper pin 4 in a counterpoint manner, compared with the positioning taper pin 4 with the positioning taper pin with a cylindrical structure extending into the positioning groove, the positioning claw 42 with a smaller body size is matched with the positioning groove more easily, and interference is not easily generated with other structures of the workpiece.

It should be noted that the number of the positioning claws 42 is not particularly limited, for example, the number of the positioning claws 42 may be 3, 4, 5 or more, as shown in fig. 3, and as a preferred embodiment, the positioning ends are provided with four positioning claws 42, and the four positioning claws 42 are uniformly arranged along the circumferential direction of the positioning taper pin 4. The four positioning claws 42 can not cause the positioning end to be too bulky, so that the processing is convenient, the four positioning claws can be matched with the distribution groove in all directions, and the reliable and accurate positioning of the workpiece can be realized.

Although the spring is not shown, the present utility model is not limited to the cooperation of the positioning taper pin 4 and the spring, and any of the following embodiments may be adopted:

example 1: as shown in fig. 4, the positioning taper pin 4 may be provided with a shaft hole 43, a positioning hole shoulder 44 is provided in the shaft hole 43, and the spring extends into the shaft hole 43 and is in stop fit with the positioning hole shoulder 44. Specifically, one end of the spring is in stop fit with the positioning hole shoulder 44, and the other end of the spring can be fixedly arranged, for example, a fixing plate can be arranged on the rear side of the clamp base 1, and the other end of the spring is fixed on the fixing plate.

Example 2: the outer side of the positioning taper pin is provided with a positioning shaft shoulder, and the spring is sleeved on the positioning taper pin and matched with the positioning shaft shoulder stop.

In order to meet the reliable sliding of the locating taper pin 4 in the central through hole, as shown in fig. 2 and 4, a waist-shaped groove 45 may be provided at the side portion of the locating taper pin 4, and the locating taper pin 4 is limited in the central through hole by the cooperation of the pin and the waist-shaped groove 45. In the concrete implementation, the clamp base body 1 and the locating taper pin 4 can be connected through the pin, the locating taper pin 4 is limited in the central through hole, and the locating taper pin 4 is prevented from falling out of the central through hole.

As a preferred embodiment of the present utility model, as shown in fig. 1, the hydraulic pump end cap machining fixture may further include a pre-compression unit 8, the pre-compression unit 8 includes a guide holder 81 and a ball support 82 fixed on the guide holder 81, the guide holder 81 is fixed on the fixture base 1, and the pre-compression unit 8 abuts against a workpiece through the ball support 82 to limit the workpiece from moving in a radial direction of the central through hole.

In specific implementation, the pre-compression unit 8 can be used as a pre-procedure for workpiece positioning, the pre-compression unit 8 is utilized to limit and compress the workpiece, alignment of each positioning surface is completed before positioning, positioning accuracy is ensured, and product quality is improved. The limit of the pre-compression unit 8 is utilized, so that the workpiece can be prevented from being bumped with parts on the clamp in the process of being placed towards the clamp base body 1, and further the workpiece is prevented from being worn or even damaged. Specifically, the guide seat 81 may be used for guiding the installation of the ball support 82, so that the ball support 82 is fixed on the fixture base 1 according to a specific direction, and the ball of the ball support 82 is ensured to contact with the positioning surface on the workpiece. Before the workpiece is installed, the ball head support 82 is kept at a determined position, when the workpiece is installed towards the positioning taper pin 4, the positioning surface of the workpiece abuts against the ball head support 82 to achieve pre-positioning and pressing, so that the workpiece cannot deviate along the radial direction of the central through hole, and at the moment, the workpiece can move towards the clamp base body 1 along the ball head support 82 (the axial direction of the central through hole) to a preset position.

Preferably, as shown in fig. 1, the hydraulic pump head cover processing jig includes a plurality of the first pressing units 2 and a plurality of the pre-pressing units 8, the first pressing units 2 and the pre-pressing units 8 being alternately arranged in the circumferential direction of the central through hole. The utility model schematically shows that the clamp is respectively provided with three first compression units 2 and three pre-compression units 8, and the first compression units 2 and the pre-compression units 8 are alternately arranged along the circumferential direction of the central through hole, so that the uniformity of stress of a workpiece on the clamp is ensured, the risk of stress concentration is reduced, and the positioning and clamping stability is improved.

Regarding the structure of the first pressing unit 2, as a preferred embodiment, as shown in fig. 1, the first pressing unit 2 may be configured as a lever cylinder including a first cylinder body 21 and a first pressing plate 22, the first cylinder body 21 driving the first pressing plate 22 to press the workpiece. The lever oil cylinder adopts the lever principle, the piston is hinged with the first pressing plate 22, the first pressing plate 22 is driven to compress a workpiece when the piston in the first oil cylinder body 21 is pushed out, and the first pressing plate 22 is driven to release the workpiece when the piston is retracted into the cylinder body.

Further, as shown in fig. 1, the clamp base 1 is fixedly provided with a support plate 9, and the first pressing plate 22 presses the workpiece onto the support plate 9. The support plate 9 can reliably support the stroke of the workpiece. Specifically, the supporting plate 9 can be fixed on the fixture base 1 through a screw or a bolt, the outer surface of the supporting plate 9 is a preset workpiece positioning position, when the distribution groove of the workpiece is matched with the positioning taper pin 4, the workpiece is pressed to move towards the fixture base 1 until the workpiece abuts against the supporting plate 9, and then the workpiece is pressed by utilizing each pressing unit.

Regarding the structure of the second pressing unit 3, as a preferred embodiment, as shown in fig. 1, the second pressing unit 3 may be configured as a corner cylinder, where the corner cylinder includes a second cylinder body 31 and a second pressing plate 32, and the second cylinder body 31 drives the second pressing plate 32 against the workpiece to limit the workpiece to rotate around the locating taper pin 4.

The working process of the corner cylinder comprises the following steps: the piston completes the rotation stroke in advance, so that the second pressing plate 32 rotates to a preset specified position and angle, and then completes the clamping stroke, so that the second pressing plate 32 moves linearly and clamps the workpiece. The second pressing plate 32 leaves the workpiece before clamping the workpiece, after the workpiece is positioned, the second pressing plate 32 is controlled to rotate by a preset angle through the reversing valve, and then the second pressing plate 32 moves linearly to compress the workpiece; when the workpiece is released, the second pressing plate 32 automatically returns to the original position according to the pressing route to release the workpiece, so that an operator can smoothly and conveniently discharge the workpiece.

The utility model can be realized by adopting or referring to the prior art at the places which are not described in the utility model.

In this specification, each embodiment is described in a progressive manner, and identical and similar parts of each embodiment are all referred to each other, and each embodiment mainly describes differences from other embodiments.

The foregoing is merely exemplary of the present utility model and is not intended to limit the present utility model. Various modifications and variations of the present utility model will be apparent to those skilled in the art. Any modification, equivalent replacement, improvement, etc. which come within the spirit and principles of the utility model are to be included in the scope of the claims of the present utility model.

Claims

1. The utility model provides a hydraulic pump end cover adds clamping apparatus, its characterized in that, includes the clamp base member, the middle part of clamp base member is equipped with central through hole, the distribution all around of central through hole is provided with first and second and compresses tightly the unit, install hole positioning unit in the central through hole, hole positioning unit includes locating taper pin and spring, locating taper pin with central through hole sliding fit, the one end of spring with locating taper pin offsets in order to support locating taper pin follows central through hole slides, locating taper pin has the conical surface, the conical surface is used for with the cooperation of the joining in marriage the chute of work piece in order to be located the clamp base member with the work piece, first compress tightly the unit can compress tightly the work piece in the clamp base member, the second compresses tightly the unit can restrict the work piece around locating taper pin rotates.

2. The hydraulic pump end cap tooling fixture of claim 1, wherein,

3. The hydraulic pump end cap tooling fixture of claim 2 wherein,

4. The hydraulic pump end cap tooling fixture of claim 1, wherein,

the positioning taper pin is provided with a shaft hole, a positioning hole shoulder is arranged in the shaft hole, and the spring stretches into the shaft hole and is matched with the positioning hole shoulder in a stop mode; or,

the outside of locating taper pin is equipped with the location shaft shoulder, the spring housing is located locating taper pin and with location shaft shoulder backstop cooperation.

5. The hydraulic pump end cap tooling fixture of claim 4 wherein,

6. The hydraulic pump end cap tooling fixture of claim 1, wherein,

7. The hydraulic pump end cap tooling fixture of claim 6 wherein,

8. The hydraulic pump end cap tooling fixture of claim 1, wherein,

9. The hydraulic pump end cap tooling fixture of claim 8 wherein,

10. The hydraulic pump end cap tooling fixture of claim 1, wherein,