CN219684690U - Automatic clamping and indexing device - Google Patents

Abstract

The utility model provides an automatic clamping and indexing device, which comprises: the fixture body is provided with a containing cavity and a plurality of positioning holes, the containing cavity is used for installing a part to be drilled, the containing cavity is arranged along the axial direction of the fixture body, the plurality of positioning holes are arranged at intervals along the radial direction of the fixture body, and the plurality of positioning holes are communicated with the containing cavity; the hydraulic driving assembly is connected with the clamping assembly, the clamping assembly is arranged at the end part of the clamp body, and the hydraulic driving assembly is used for driving the clamping assembly to move along the axial direction of the clamp body so as to clamp or loosen a part to be drilled; the fixture body is fixedly arranged at the center of the worm wheel, the worm is meshed with the worm wheel, and the worm drives the worm wheel to rotate so as to drive the fixture body to rotate to complete automatic indexing of the part to be drilled. By applying the technical scheme of the utility model, the technical problems of low machining precision and low production efficiency of valve rod parts in the prior art are solved.

Description

Automatic clamping and indexing device

Technical Field

The utility model relates to the technical field of part machining, in particular to an automatic clamping and indexing device.

Background

Currently, for valve rod parts, four uniform strokes are required to be made on the outer cylindrical surface of the valve rod partThe common procedure in the prior art is to drill after the dividing head is used for dividing independently, however, because the valve rod part is small in size, the clamping is inconvenient, the machining process is tedious and long in time consumption, the dividing head is rotated in a reciprocating mode, the production efficiency is low, the form and position tolerance and the hole distance of the hole are not guaranteed to be equal in dividing precision, and the product quality is difficult to control.

Disclosure of Invention

The utility model provides an automatic clamping and indexing device which can solve the technical problems of low machining precision and low production efficiency of valve rod parts in the prior art.

The utility model provides an automatic clamping and indexing device, which comprises: the fixture body is provided with a containing cavity and a plurality of positioning holes, the containing cavity is used for installing a part to be drilled, the containing cavity is arranged along the axial direction of the fixture body, the plurality of positioning holes are arranged at intervals along the radial direction of the fixture body, and the plurality of positioning holes are communicated with the containing cavity; the hydraulic driving assembly is connected with the clamping assembly, the clamping assembly is arranged at the end part of the clamp body, and the hydraulic driving assembly is used for driving the clamping assembly to move along the axial direction of the clamp body so as to clamp or loosen a part to be drilled; the fixture body is fixedly arranged at the center of the worm wheel, the worm is meshed with the worm wheel, and the worm drives the worm wheel to rotate so as to drive the fixture body to rotate to complete automatic indexing of the part to be drilled.

Further, the hydraulic driving assembly comprises a three-position four-way valve, a hydraulic source, a first oil tank, a second oil tank, an overflow valve, a one-way throttle valve, a one-way valve and a hydraulic cylinder, wherein the hydraulic source is connected with the three-position four-way valve, the first oil tank is connected with the three-position four-way valve, the second oil tank is connected with the three-position four-way valve after being connected with the overflow valve, and the one-way throttle valve is respectively connected with a rodless cavity of the hydraulic cylinder and the three-position four-way valve after being connected with the one-way valve in parallel.

Further, hold the chamber and hold the chamber including first chamber and second, first chamber and second hold the chamber and be the ladder setting, first diameter that holds the chamber is greater than the second diameter that holds the chamber, and a plurality of locating holes are linked together with first chamber that holds.

Further, the automatic clamping and indexing device further comprises a sleeve, the sleeve is optionally arranged in the accommodating cavity, the outer diameter of the sleeve is identical to the inner diameter of the accommodating cavity, and the inner diameter of the sleeve is identical to the outer diameter of the part to be drilled.

Further, the clamping assembly comprises a top cap and a clamp handle, the top cap is arranged in the clamp handle and used for propping up a part to be drilled, and the hardness of the top cap is smaller than that of the clamp handle; the automatic clamping and indexing device further comprises a flat key, the clamp handle is provided with a key groove, the clamp body is provided with a sliding groove, the flat key is arranged in the key groove and the sliding groove, and the clamp handle is connected with the clamp body through the flat key.

Further, the top cap is a copper top cap.

Further, the automatic clamping and indexing device further comprises a plurality of protection inner rings, the protection inner rings are arranged in one-to-one correspondence with the positioning holes, and the protection inner rings are arranged in the positioning holes.

Further, the material of the protective inner ring comprises high manganese steel, wear-resistant chromium cast iron, wear-resistant alloy steel or austempered ductile iron.

Further, the automatic clamping and indexing device further comprises a movable ejector rod, the clamping assembly is arranged at one end of the clamp body, the movable ejector rod is in threaded connection with the other end of the clamp body, the movable ejector rod is provided with a chip removal hole, and the chip removal hole is communicated with the accommodating cavity.

Further, the automatic clamping and indexing device comprises four positioning holes which are uniformly arranged at intervals along the circumferential direction of the clamp body.

By means of the technical scheme, the automatic clamping and indexing device is provided, the device comprises the clamp body, during machining, a part to be drilled is placed in the clamp body, the hydraulic driving assembly is used for driving the clamping assembly to clamp the part to be drilled after the part to be drilled is placed, the drilling machine penetrates through the positioning hole in the clamp body to realize the punching operation on the part to be drilled, after one hole is punched, the worm wheel is driven by the worm to drive the clamp body to rotate, the clamp body is rotated to a set position, the drilling operation of the next hole is completed, the process is repeated until the drilling operation of all holes is completed, and compared with the prior art, the drilling of the holes on the outer cylindrical surface of the part to be drilled can be performed by rotating the clamp body, so that the machining position and the dimensional precision of the part to be drilled are guaranteed, and the production efficiency is improved; in addition, the hydraulic driving assembly drives the clamping assembly to move along the axial direction of the clamp body so as to clamp or loosen the part to be drilled, so that the part to be drilled can be automatically clamped, and the production efficiency is further improved; moreover, through setting up worm gear in order to drive the anchor clamps body and rotate, can guarantee the anchor clamps body graduation accuracy, simple structure is easy to use, has the auto-lock nature, can not change circumference position because of receiving external force when the drilling, can guarantee the accuracy of graduation location and the stability when drilling better, can realize the drilling function of a plurality of holes of circumferencial direction according to this principle.

Drawings

The accompanying drawings, which are included to provide a further understanding of embodiments 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 principles of the utility model. It is evident that the drawings in the following description are only some embodiments of the present utility model and that other drawings may be obtained from these drawings without inventive effort for a person of ordinary skill in the art.

FIG. 1 illustrates an assembly view of an automatic clamping and indexing device provided in accordance with an embodiment of the present utility model;

FIG. 2 illustrates a schematic structural view of a valve stem component provided in accordance with an embodiment of the present utility model;

FIG. 3a is a schematic view showing the structure of the automatic clamping and indexing device according to the embodiment of the present utility model;

FIG. 3b illustrates a front view of the automated clamping and indexing device provided in accordance with an embodiment of the present utility model;

FIG. 3c shows a cross-sectional view A-A of the self-clamping and indexing device provided in FIG. 3 b;

FIG. 4a shows a schematic structural view of a clamp body provided in accordance with a specific embodiment of the present utility model;

FIG. 4b illustrates a front view of a clamp body provided in accordance with a specific embodiment of the present utility model;

FIG. 4c shows a cross-sectional view of the body of the clamp provided in FIG. 4 b;

FIG. 5 illustrates a hydraulic control schematic of an automatic clamping and indexing device provided in accordance with an embodiment of the present utility model;

FIG. 6a illustrates a control circuit diagram of a first stage of a hydraulic drive assembly for clamping a valve stem provided in accordance with an embodiment of the present utility model;

FIG. 6b illustrates a control circuit diagram of a second stage of a hydraulic drive assembly clamping a valve stem provided in accordance with an embodiment of the present utility model;

FIG. 7 illustrates a hydraulic drive assembly control circuit diagram for a quick release valve stem provided in accordance with an embodiment of the present utility model;

fig. 8 is a schematic structural view of an automatic indexing and positioning function of a worm gear according to an embodiment of the present utility model.

Wherein the above figures include the following reference numerals:

10. a clamp body; 10a, a receiving cavity; 101a, a first accommodation chamber; 102a, a second accommodation chamber; 10b, positioning holes; 20. a hydraulic drive assembly; 21. a three-position four-way valve; 22. a hydraulic source; 23. a first oil tank; 24. a second oil tank; 25. an overflow valve; 26. a one-way throttle valve; 27. a one-way valve; 28. a hydraulic cylinder; 30. a clamping assembly; 31. a top cap; 32. a clamp handle; 40. a worm wheel; 50. a worm; 60. a movable ejector rod; 60a, chip removal holes; 100. the part to be drilled.

Detailed Description

It should be noted that, without conflict, the embodiments of the present utility model and features of the embodiments may be combined with each other. The following description of the embodiments of the present utility model will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present utility model, but not all embodiments. The following description of at least one exemplary embodiment is merely exemplary in nature and is in no way intended to limit the utility model, its application, or uses. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.

It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of exemplary embodiments according to the present utility model. As used herein, the singular is also intended to include the plural unless the context clearly indicates otherwise, and furthermore, it is to be understood that the terms "comprises" and/or "comprising" when used in this specification are taken to specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof.

The relative arrangement of the components and steps, numerical expressions and numerical values set forth in these embodiments do not limit the scope of the present utility model unless it is specifically stated otherwise. Meanwhile, it should be understood that the sizes of the respective parts shown in the drawings are not drawn in actual scale for convenience of description. Techniques, methods, and apparatus known to one of ordinary skill in the relevant art may not be discussed in detail, but should be considered part of the specification where appropriate. In all examples shown and discussed herein, any specific values should be construed as merely illustrative, and not a limitation. Thus, other examples of the exemplary embodiments may have different values. It should be noted that: like reference numerals and letters denote like items in the following figures, and thus once an item is defined in one figure, no further discussion thereof is necessary in subsequent figures.

As shown in fig. 1 to 8, according to an embodiment of the present utility model, there is provided an automatic clamping and indexing device including a clamp body 10, a hydraulic driving assembly 20, a clamping assembly 30, a worm wheel 40 and a worm 50, the clamp body 10 having a receiving cavity 10a and a plurality of positioning holes 10b, the receiving cavity 10a being for mounting a part to be drilled, the receiving cavity 10a being disposed along an axial direction of the clamp body 10, the plurality of positioning holes 10b being disposed at intervals in a radial direction of the clamp body 10, the plurality of positioning holes 10b being in communication with the receiving cavity 10a, the hydraulic driving assembly 20 being connected with the clamping assembly 30, the clamping assembly 30 being disposed at an end of the clamp body 10, the hydraulic driving assembly 20 being for driving the clamping assembly 30 to move in an axial direction of the clamp body 10 to clamp or release the part to be drilled, the clamp body 10 being fixedly disposed at a central position of the worm wheel 40, the worm 50 being engaged with the worm wheel 40, the worm 50 being rotated by driving the worm wheel 40 to drive the clamp body 10 to rotate to complete automatic indexing of the part to be drilled.

By means of the configuration mode, the automatic clamping and indexing device is provided, the device is provided with the clamp body, during machining, a part to be drilled is placed in the clamp body, the hydraulic driving assembly is used for driving the clamping assembly to clamp the part to be drilled after the part to be drilled is placed, the drilling machine penetrates through the positioning hole in the clamp body to realize the punching operation on the part to be drilled, after one hole is punched, the worm wheel is driven by the worm to drive the clamp body to rotate, after the clamp body is rotated to a set position, the drilling operation of the next hole is completed, the process is repeated until the drilling operation of all holes is completed, compared with the prior art, the drilling of the holes on the outer cylindrical surface of the part to be drilled can be performed by rotating the clamp body, the position and the dimensional precision of the part to be drilled are guaranteed, and the production efficiency is improved; in addition, the hydraulic driving assembly drives the clamping assembly to move along the axial direction of the clamp body so as to clamp or loosen the part to be drilled, so that the part to be drilled can be automatically clamped, and the production efficiency is further improved; moreover, through setting up worm gear in order to drive the anchor clamps body and rotate, can guarantee the anchor clamps body graduation accuracy, simple structure is easy to use, has the auto-lock nature, can not change circumference position because of receiving external force when the drilling, can guarantee the accuracy of graduation location and the stability when drilling better, can realize the drilling function of a plurality of holes of circumferencial direction according to this principle.

Further, in the present utility model, in order to drive the clamping assembly 30 to move in the axial direction of the jig body 10 to clamp or unclamp a part to be drilled, the hydraulic driving assembly 20 may be configured to include a three-position four-way valve 21, a hydraulic pressure source 22, a first oil tank 23, a second oil tank 24, an overflow valve 25, a one-way throttle valve 26, a one-way valve 27, and a hydraulic cylinder 28, the hydraulic pressure source 22 being connected to the three-position four-way valve 21, the first oil tank 23 being connected to the three-position four-way valve 21, the second oil tank 24 being connected to the overflow valve 25 and then being connected to the three-position four-way valve 21, the one-way throttle valve 26 being connected in parallel with the one-way valve 27 and then being connected to the rodless chamber of the hydraulic cylinder 28 and the three-position four-way valve 21, respectively.

Specifically, an automatic clamping hydraulic control schematic diagram of the hydraulic driving assembly is shown in fig. 3, and the working process of the clamp is divided into two stages of clamping a valve rod and rapidly loosening.

First, the clamping valve stem stage.

The hydraulic driving assembly is opened, all the electromagnetic valves are in an initial state, the three-position four-way reversing valve 21 is in the middle position, the oil returns to the first oil tank 23 through the middle position of the three-position four-way reversing valve 21, and the first manual switch of the three-position four-way valve is opened first, as shown in fig. 6 a. At this time, the left-position operation of the three-position four-way reversing valve 21 is connected to the system oil path, and the oil enters the rodless cavity of the hydraulic cylinder 28 along the pipeline through the one-way throttle valve 26, and the one-way throttle valve 26 controls the flow rate of the oil, so that the hydraulic cylinder 28 moves slowly, and the piston rod of the hydraulic cylinder 28 drives the clamping assembly 30 to move rightwards along the axial direction of the clamp body, so as to gradually clamp the part to be drilled.

After the hydraulic cylinder gradually clamps the part to be drilled, when the pressure intensity in the rodless cavity of the hydraulic cylinder 28 is larger than or equal to a set value, the P, T interface of the overflow valve 25 is communicated, as shown in fig. 6b, oil in the oil inlet path flows back to the second oil tank 24 through the overflow valve 25, so that the part to be drilled is clamped, the workpiece is not damaged due to overlarge clamping force, and the constant-pressure protection function is realized.

Second, a quick release phase.

When the part to be drilled needs to be loosened and taken out after the machining of the part to be drilled is completed, a second manual switch of the three-position four-way valve 21 is turned on, as shown in fig. 7. At this time, the right working of the three-position four-way valve 21 is connected to the system oil way, the oil enters the rod cavity of the hydraulic cylinder 28 along the pipeline, at this time, because the throttle valve is not arranged on the oil inlet pipeline, the oil returns to the first oil tank 23 directly through the one-way valve 27 on the oil return pipeline, so that the piston rod of the hydraulic cylinder 28 can rapidly move leftwards, and the piston rod of the hydraulic cylinder 28 drives the clamping assembly 30 to move leftwards along the axial direction of the clamp body, thereby realizing the action of rapidly loosening the workpiece.

Therefore, through the design of the hydraulic driving assembly, the clamping assembly can automatically do linear motion to the right or left along the axial direction, so that the clamping assembly can automatically clamp the part to be drilled.

Further, in the present utility model, in order to expand the application range of the automatic clamping and indexing device and enable the automatic clamping and indexing device to complete drilling processing of various diameter parts, the accommodating cavity 10a may be configured to include a first accommodating cavity 101a and a second accommodating cavity 102a, the first accommodating cavity 101a and the second accommodating cavity 102a are arranged in a stepped manner, the diameter of the first accommodating cavity 101a is larger than that of the second accommodating cavity 102a, and the plurality of positioning holes 10b are communicated with the first accommodating cavity 101 a.

Under the configuration mode, when the part with the larger diameter needs to be drilled, the part can be placed in the first accommodating cavity and is attached to the inner wall of the first accommodating cavity, the clamping component clamps the part to be drilled by taking the step surface formed between the first accommodating cavity and the second accommodating cavity as a positioning surface, and further the drilling of the part with the larger diameter is completed; when the part with smaller diameter needs to be drilled, the part can be placed in the second accommodating cavity and attached to the inner wall of the second accommodating cavity, the end wall surface of the second accommodating cavity is used as a locating surface, and the clamping assembly clamps the part to be drilled, so that the drilling of the part with larger diameter is completed. The mode can meet the processing requirements of parts with different sizes, the application range of the clamp is increased, and the economic benefit is improved. As other embodiments of the present utility model, the accommodating chambers may be provided to include three, four or more accommodating chambers, and may be determined according to the number of parts actually required to be machined, wherein the inner diameter of each accommodating chamber may be determined according to the diameter of the part to be machined.

As a further embodiment of the present utility model, in order to reduce the difficulty of the process and to ensure the rigidity of the workpiece, when it is necessary to drill a part with a larger diameter, the automatic clamping and indexing device may be configured to further include a sleeve, optionally disposed in the housing cavity 10a, having an outer diameter identical to the inner diameter of the housing cavity 10a and an inner diameter identical to the outer diameter of the part to be drilled.

Under the configuration mode, when a part with a larger diameter needs to be drilled, the part can be placed in the accommodating cavity and is attached to the inner wall of the accommodating cavity, the clamping component clamps the part to be drilled by taking a step surface formed between the accommodating cavity and the sleeve as a positioning surface, and further the drilling of the part with the larger diameter is completed; when the part with smaller diameter needs to be drilled, the part can be placed in the sleeve and attached to the inner wall of the sleeve, the end wall surface of the accommodating cavity is used as a locating surface, and the clamping assembly clamps the part to be drilled, so that the drilling of the part with larger diameter is completed. In this embodiment, the inner bore diameter of the sleeve may be selected to be determined based on the diameter of the part to be machined.

Further, in the present utility model, in order to reduce the indentation of the part to be drilled and to improve the service life of the clamping assembly, the clamping assembly 30 may be configured to include a top cap 31 and a clamp handle 32, the top cap 31 being disposed within the clamp handle 32, the top cap 31 being for pressing against the part to be drilled, the top cap 31 having a hardness less than that of the clamp handle 32. The automatic clamping and indexing device further comprises a flat key, the clamp handle 32 is provided with a key groove, the clamp body 10 is provided with a sliding groove, the flat key is arranged in the key groove and the sliding groove, and the clamp handle 32 is connected with the clamp body 10 through the flat key.

Under this kind of configuration mode, set up the top cap in the anchor clamps handle, the top cap is used for the top to tightly wait to bore the part, because the top cap hardness is lower, can prevent to wait to bore the part and directly contact with the anchor clamps handle, reduced the indentation of waiting to bore the part and to the wearing and tearing of anchor clamps handle. In addition, by arranging the flat key, the clamp handle is connected with the clamp body through the flat key, and the worm gear can drive the clamping assembly and the part to be drilled to rotate simultaneously when being matched with the clamp body to drive the clamp body to rotate, so that the drilling precision is ensured; in addition, the flat key is arranged in the chute, and the length of the chute is greater than that of the flat key. When drilling is completed, the clamping assembly 30 is axially movable relative to the clamp body 10 to release the part to be drilled. Alternatively, the chute may be provided on the clamp body and the keyway provided on the clamp handle. As a specific embodiment of the present utility model, the top cap 31 may be configured as a copper top cap 31 in consideration of the difficulty in material acquisition.

Further, in the present utility model, in order to ensure that the fixture body is not damaged by the drill bit when in use, the automatic clamping and indexing device may be configured to further include a plurality of protection inner rings, which are disposed in one-to-one correspondence with the plurality of positioning holes 10b, and disposed within the positioning holes 10 b. As a specific embodiment of the utility model, the material of the protective inner ring is wear-resistant material, including high manganese steel, wear-resistant chromium cast iron, wear-resistant alloy steel or austempered ductile iron. Specifically, high manganese steel series: such as high manganese steel (ZGMn 13), gao Meng alloy (ZGMn 13Cr2 MoRe), ultra-high manganese alloy (ZGMn 18Cr2 MoRe) and the like; series of wear-resistant chromium cast iron: such as high, medium and low chromium alloy cast iron (e.g., cr15 MOZCu); wear-resistant alloy steel series: such as medium, low, and high carbon multi-element alloy steels (e.g., ZG40SiMnCrMO and ZG35Cr2MoNiRe.

Alternatively, as a further embodiment of the utility model, the positioning holes in the middle of the clamp body can be subjected to quenching treatment, so that the wear resistance of the part is improved.

In addition, in order to timely discharge the chip liquid in the machining process and prevent the chip liquid from being retained in the clamp body and affecting the machining precision, the automatic clamping and indexing device can be configured to further comprise a movable ejector rod 60, wherein the clamping assembly 30 is arranged at one end of the clamp body 10, the movable ejector rod 60 is in threaded connection with the other end of the clamp body 10, the movable ejector rod 60 is provided with a chip removing hole 60a, and the chip removing hole 60a is communicated with the accommodating cavity 10 a.

Further, as an embodiment of the present utility model, the automatic clamping and indexing device may be configured to include four positioning holes 10b, the four positioning holes 10b being uniformly spaced along the circumferential direction of the jig body 10.

For a further understanding of the present utility model, the automatic clamping and indexing device provided by the present utility model will be described in detail with reference to fig. 1 to 6.

As shown in fig. 1 to 6, according to an embodiment of the present utility model, there is provided an automatic clamping and indexing device including a clamp body 10, a hydraulic driving assembly 20, a clamping assembly 30, a worm wheel 40, a worm 50, and a movable ram 60, the clamping assembly 30 including a top cap 31 and a clamp handle 32, the top cap 31 being disposed in the clamp handle 32, the top cap 31 being for pressing against a part to be drilled, the top cap 31 having a hardness less than that of the clamp handle 32. In this embodiment, the part to be drilled is a valve rod part, the top cap 31 is a copper top cap, the copper top cap has low hardness, the part is prevented from directly contacting the clamp handle 32, and the indentation of the part and the abrasion of the clamp handle 32 are reduced.

According to the automatic clamping and indexing device, when the auxiliary valve rod part is perforated, the copper top cap is installed in the hole on the right side of the clamp handle 32, the clamp handle 32 is in clearance fit with the top cap 31, the copper top cap is in contact with the top surface of the excircle of the left small end of the valve rod part during assembly, the top cap made of red copper is low in hardness, and the valve rod can be effectively prevented from being pressed.

The outer circle of the right large end of the valve rod part is arranged in the inner hole of the clamp body, the axial position of the hole of the outer cylindrical surface is determined by taking the bottom end surface of the inner hole of the clamp body as a reference according to the axial position size of the hole of the valve rod on the outer cylindrical surface, so that the hole on the outer cylindrical surface of the clamp body corresponds to the position of the valve rod to be drilled, the correct positioning of the valve rod in the inner hole of the clamp body is ensured, and the axial position precision of the drilled hole is controlled, as shown in figure 1.

The movable ejector rod 60 is in threaded connection with an inner hole on the right side of the clamp body, and the clamp is convenient for discharging chips, cutting fluid and the like when in use. The clamp handle and the copper top cap are arranged in a threaded hole on the left side of the clamp body, and the clamping function of the valve rod is realized through the threaded fit of the clamp body.

In order to improve the durability of the clamp body, the holes on the outer cylindrical surface of the clamp body can be subjected to partial quenching treatment to improve the hardness, or the inner rings made of high-hardness materials are placed in the positioning holes, so that the clamp body is prevented from being damaged by the drill bit when in use, and the drilling precision is ensured.

After the valve rod part is clamped in the clamp body, the clamp body is fixed on the worm wheel, the worm wheel is matched with the worm, the clamp body is driven to rotate by 90 degrees to drill a second hole through the matching of the worm wheel and the worm after drilling of one hole is completed, and compared with a traditional drilling method, the machining precision and efficiency are improved.

As shown in FIG. 3, with the aid of the hydraulic driving assembly, the clamp body is a fixed end, an operator manually places the valve rod part into a hole of the clamp body, and the clamp handle can automatically make linear movement right or left along the axial direction by designing the hydraulic driving assembly, so that the clamp handle can automatically clamp the part.

The automatic clamping hydraulic control schematic diagram of the valve rod clamp is shown in fig. 5. The working process of the clamp is divided into two stages of clamping the valve rod and rapidly loosening.

First, the clamping valve stem stage.

The hydraulic driving assembly is opened, all the electromagnetic valves are in an initial state, the three-position four-way reversing valve 21 is in the middle position, the oil returns to the first oil tank 23 through the middle position of the three-position four-way reversing valve 21, and the first manual switch of the three-position four-way valve is opened first, as shown in fig. 6 a. At this time, the left-position operation of the three-position four-way reversing valve 21 is connected to the system oil path, and the oil enters the rodless cavity of the hydraulic cylinder 28 along the pipeline through the one-way throttle valve 26, and the one-way throttle valve 26 controls the flow rate of the oil, so that the hydraulic cylinder 28 moves slowly, and the piston rod of the hydraulic cylinder 28 drives the clamping assembly 30 to move rightwards along the axial direction of the clamp body, so as to gradually clamp the part to be drilled.

After the hydraulic cylinder gradually clamps the part to be drilled, when the pressure intensity in the rodless cavity of the hydraulic cylinder 28 is larger than or equal to a set value, the P, T interface of the overflow valve 25 is communicated, as shown in fig. 6b, oil in the oil inlet path flows back to the second oil tank 24 through the overflow valve 25, so that the part to be drilled is clamped, the workpiece is not damaged due to overlarge clamping force, and the constant-pressure protection function is realized.

Second, a quick release phase.

When the part to be drilled needs to be loosened and taken out after the machining of the part to be drilled is completed, a second manual switch of the three-position four-way valve 21 is turned on, as shown in fig. 7. At this time, the right working of the three-position four-way valve 21 is connected to the system oil way, the oil enters the rod cavity of the hydraulic cylinder 28 along the pipeline, at this time, because the throttle valve is not arranged on the oil inlet pipeline, the oil returns to the first oil tank 23 directly through the one-way valve 27 on the oil return pipeline, so that the piston rod of the hydraulic cylinder 28 can rapidly move leftwards, and the piston rod of the hydraulic cylinder 28 drives the clamping assembly 30 to move leftwards along the axial direction of the clamp body, thereby realizing the action of rapidly loosening the workpiece.

The automatic indexing and positioning function of the valve rod clamp drives the worm wheel to rotate through the active rotation of the worm by means of the working principle of the worm wheel and the worm, and the form of the mechanism is shown in figure 8. The fixture body is placed and fixed at the center position of the worm wheel, 4 radial holes are required to be drilled in the circumferential direction, each hole is spaced by 90 degrees, therefore, after the fixture body is fixed, a first inner hole is drilled at any position of four holes of the fixture body, the worm is rotated for a plurality of turns through the motor, the worm wheel is stopped after being rotated for 90 degrees at the current circumferential position, automatic indexing positioning from the first hole to the second hole is achieved, and the like until 4 holes are drilled.

The principle of using worm and gear designs this function mainly because the graduation of this mechanism is accurate, simple structure easily uses, has the auto-lock nature, can not change circumference position because of receiving external force when the drilling, the accuracy of assurance graduation location and the stability when drilling that can be better. According to this principle, a drilling function of a plurality of holes in the circumferential direction can be realized.

In summary, the utility model provides an automatic clamping and indexing device, the device is provided with a clamp body, a part to be drilled is placed in the clamp body during processing, a hydraulic driving assembly is used for driving the clamp assembly to clamp the part to be drilled after the part to be drilled is placed, a drilling machine penetrates through a positioning hole on the clamp body to realize the punching operation on the part to be drilled, a worm is used for driving a worm wheel to drive the clamp body to rotate after one hole is punched, the clamp body is rotated to a set position, the drilling operation of the next hole is completed, the process is repeated until the drilling operation of all holes is completed, compared with the prior art, the drilling of the hole on the outer cylindrical surface of the part to be drilled can be performed by rotating the clamp body, the position and the dimensional precision of the part to be drilled are ensured, and the production efficiency is improved; in addition, the hydraulic driving assembly drives the clamping assembly to move along the axial direction of the clamp body so as to clamp or loosen the part to be drilled, so that the part to be drilled can be automatically clamped, and the production efficiency is further improved; moreover, through setting up worm gear in order to drive the anchor clamps body and rotate, can guarantee the anchor clamps body graduation accuracy, simple structure is easy to use, has the auto-lock nature, can not change circumference position because of receiving external force when the drilling, the accuracy of assurance graduation location that can be better and the stability when drilling can realize the drilling function of a plurality of holes of circumferencial direction according to this principle.

In the description of the present utility model, it should be understood that the azimuth or positional relationships indicated by the azimuth terms such as "front, rear, upper, lower, left, right", "lateral, vertical, horizontal", and "top, bottom", etc., are generally based on the azimuth or positional relationships shown in the drawings, merely to facilitate description of the present utility model and simplify the description, and these azimuth terms do not indicate and imply that the apparatus or elements referred to must have a specific azimuth or be constructed and operated in a specific azimuth, and thus should not be construed as limiting the scope of protection of the present utility model; the orientation word "inner and outer" refers to inner and outer relative to the contour of the respective component itself.

Spatially relative terms, such as "above … …," "above … …," "upper surface at … …," "above," and the like, may be used herein for ease of description to describe one device or feature's spatial location relative to another device or feature as illustrated in the figures. It will be understood that the spatially relative terms are intended to encompass different orientations in use or operation in addition to the orientation depicted in the figures. For example, if the device in the figures is turned over, elements described as "above" or "over" other devices or structures would then be oriented "below" or "beneath" the other devices or structures. Thus, the exemplary term "above … …" may include both orientations of "above … …" and "below … …". The device may also be positioned in other different ways (rotated 90 degrees or at other orientations) and the spatially relative descriptors used herein interpreted accordingly.

In addition, the terms "first", "second", etc. are used to define the components, and are only for convenience of distinguishing the corresponding components, and the terms have no special meaning unless otherwise stated, and therefore should not be construed as limiting the scope of the present utility model.

The above description is only of the preferred embodiments of the present utility model and is not intended to limit the present utility model, but various modifications and variations can be made to the present utility model by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present utility model should be included in the protection scope of the present utility model.

Claims (9)

1. An automatic clamping and indexing device, characterized in that it comprises:

the fixture body (10), the fixture body (10) is provided with a containing cavity (10 a) and a plurality of positioning holes (10 b), the containing cavity (10 a) is used for installing a part to be drilled, the containing cavity (10 a) is arranged along the axial direction of the fixture body (10), the plurality of positioning holes (10 b) are arranged at intervals along the radial direction of the fixture body (10), and the plurality of positioning holes (10 b) are communicated with the containing cavity (10 a);

the hydraulic driving assembly (20) and the clamping assembly (30), the hydraulic driving assembly (20) is connected with the clamping assembly (30), the clamping assembly (30) is arranged at the end part of the clamp body (10), and the hydraulic driving assembly (20) is used for driving the clamping assembly (30) to move along the axial direction of the clamp body (10) so as to clamp or loosen the part to be drilled;

the fixture comprises a worm wheel (40) and a worm (50), wherein the fixture body (10) is fixedly arranged at the center of the worm wheel (40), the worm (50) is in meshed connection with the worm wheel (40), and the worm (50) drives the worm wheel (40) to rotate so as to drive the fixture body (10) to rotate to finish automatic indexing of the part to be drilled; the hydraulic drive assembly (20) comprises a three-position four-way valve (21), a hydraulic source (22), a first oil tank (23), a second oil tank (24), an overflow valve (25), a one-way throttle valve (26), a one-way valve (27) and a hydraulic cylinder (28), wherein the hydraulic source (22) is connected with the three-position four-way valve (21), the first oil tank (23) is connected with the three-position four-way valve (21), the second oil tank (24) is connected with the overflow valve (25) and then is connected with the three-position four-way valve (21), and the one-way throttle valve (26) is connected with a rodless cavity of the hydraulic cylinder (28) and the three-position four-way valve (21) after being connected in parallel.

2. The automatic clamping and indexing device according to claim 1, wherein the housing cavity (10 a) comprises a first housing cavity (101 a) and a second housing cavity (102 a), the first housing cavity (101 a) and the second housing cavity (102 a) are arranged in a step, the diameter of the first housing cavity (101 a) is larger than that of the second housing cavity (102 a), and a plurality of positioning holes (10 b) are communicated with the first housing cavity (101 a).

3. The automatic clamping and indexing device according to claim 2, characterized in that it further comprises a sleeve, which is arranged in the housing chamber (10 a), the outer diameter of which is the same as the inner diameter of the housing chamber (10 a), and the inner diameter of which is the same as the outer diameter of the part to be drilled.

4. A device according to any one of claims 1 to 3, wherein the clamping assembly (30) comprises a top cap (31) and a clamp handle (32), the top cap (31) being arranged within the clamp handle (32), the top cap (31) being adapted to press against the part to be drilled, the top cap (31) having a hardness less than the hardness of the clamp handle (32); the automatic clamping and indexing device further comprises a flat key, the clamp handle (32) is provided with a key groove, the clamp body (10) is provided with a sliding groove, the flat key is arranged in the key groove and the sliding groove, and the clamp handle (32) is connected with the clamp body (10) through the flat key.

5. The automatic clamping and indexing device according to claim 4, characterized in that the top cap (31) is a copper top cap (31).

6. The automatic clamping and indexing device according to claim 4, further comprising a plurality of protective inner rings, which are arranged in a one-to-one correspondence with the plurality of positioning holes (10 b), the protective inner rings being arranged in the positioning holes (10 b).

7. The automatic clamping and indexing device of claim 6, wherein the material of the protective inner ring comprises high manganese steel, wear resistant chromium cast iron, wear resistant alloy steel or austempered ductile iron.

8. The automatic clamping and indexing device according to claim 1, further comprising a movable ejector rod (60), wherein the clamping assembly (30) is arranged at one end of the clamping body (10), the movable ejector rod (60) is in threaded connection with the other end of the clamping body (10), the movable ejector rod (60) is provided with a chip removal hole (60 a), and the chip removal hole (60 a) is communicated with the accommodating cavity (10 a).

9. The automatic clamping and indexing device according to claim 8, characterized in that it comprises four said positioning holes (10 b), the four said positioning holes (10 b) being uniformly spaced along the circumference of the clamping body (10).