Machine tool clamping mechanism and machine tool

Abstract

The machine tool clamping mechanism comprises a machine body and a rotating shaft, the rotating shaft is provided with a brake pad, the machine body is provided with a brake seat on the first side of the brake pad, the machine body is provided with a cylinder body and a piston on the second side of the brake pad, and a first framework oil seal is arranged on the first side of the brake pad between the brake seat and the rotating shaft. And a second framework oil seal is arranged on the second side of the brake pad between the cylinder body and the rotating shaft. According to the utility model, the piston can move along the axial direction under the action of air pressure or oil pressure in the cylinder body until the brake pad is pressed to be in contact with the brake seat, so that the brake pad is clamped on the brake seat. Or the piston can move in the axial direction under the action of air pressure or oil pressure in the cylinder body, so that the piston is separated from the brake pad, and the loosening action is achieved. The first framework oil seal and the second framework oil seal seal the whole clamping mechanism, it can be guaranteed that no oil leaks into a product, it is guaranteed that the product performance is reliable, and the product machine tool is effectively prevented from being polluted by oil stains of the machine tool clamping mechanism.

Description

Technical Field

[0001] The utility model is used in the field of machine tools, in particular to a machine tool clamping mechanism and a machine tool. Background Art

[0002] The existing clamping mechanism for CNC machine tools has the problem of not being able to self-lock in emergency situations such as power failure, oil failure, and gas failure, which makes the rotating mechanism parts in the CNC machine tools easy to be damaged, and the oil of the existing clamping mechanism of CNC machine tools is easy to leak, and the products of the machine tools are easy to be contaminated by the oil of the clamping mechanism of the machine tools. In addition, the existing clamping mechanism for CNC machine tools has a complex structure and is difficult to maintain. Utility Model Content

[0003] The utility model aims to solve at least one of the technical problems existing in the prior art and provides a machine tool clamping mechanism and a machine tool.

[0004] The technical solution adopted by the utility model to solve its technical problems is:

[0005] In a first aspect, a machine tool clamping mechanism comprises a machine body and a rotating shaft, wherein the rotating shaft is provided with a brake pad, the machine body is provided with a brake seat on a first side of the brake pad, the machine body is provided with a cylinder body and a piston on a second side of the brake pad, a first skeleton oil seal is provided between the brake seat and the rotating shaft on the first side of the brake pad, and a second skeleton oil seal is provided between the cylinder body and the rotating shaft on the second side of the brake pad.

[0006] In combination with the first aspect, in certain implementations of the first aspect, the rotating shaft is provided with a brake pad mounting seat, the brake pad mounting seat has an axial end surface, and the brake pad is pressed against the axial end surface through a brake spacer.

[0007] In combination with the first aspect and the above-mentioned implementations, in certain implementations of the first aspect, the brake pad mounting seat is provided with a circular outer circumferential surface at a radially inner position of the brake seat, the brake seat is provided with a first mounting groove at a radially outer position of the brake pad mounting seat, the first skeleton oil seal is arranged between the brake seat and the brake pad mounting seat, the first skeleton oil seal is installed in the first mounting groove, and the first skeleton oil seal is provided with a first elastic sealing lip that fits with the outer circumferential surface of the brake seat.

[0008] In combination with the first aspect and the above-mentioned implementation methods, in certain implementation methods of the first aspect, the cylinder body is provided with a second mounting groove at a radially outer position of the rotating shaft, the second skeleton oil seal is installed in the second mounting groove, and the second skeleton oil seal is provided with a second elastic sealing lip that fits with the outer peripheral surface of the rotating shaft.

[0009] In combination with the first aspect and the above-mentioned implementations, in certain implementations of the first aspect, the cylinder body is provided with an annular groove on the end surface facing the brake pad, the piston extends axially from a first end to a second end, the first end is used to clamp the brake pad, and the second end is floatingly arranged in the annular groove, the piston is provided with a flange extending radially outward, a first oil chamber is provided between the flange and the brake seat, a second oil chamber is provided between the flange and the cylinder body, the cylinder body is provided with a first joint connected to the first oil chamber, and the cylinder body is provided with a second joint connected to the second oil chamber.

[0010] In combination with the first aspect and the above-mentioned implementations, in some implementations of the first aspect, an elastic component is provided between the second end of the piston and the cylinder body, and the elastic component is used to provide a force to automatically clamp the piston to the brake pad.

[0011] In combination with the first aspect and the above-mentioned implementations, in some implementations of the first aspect, an axial blind hole is provided at the second end of the piston, a guide pin is provided in the axial blind hole, and the elastic component includes a disc spring sleeved on the guide pin.

[0012] In combination with the first aspect and the above-mentioned implementations, in certain implementations of the first aspect, the cylinder body is provided with a pressure plate for limiting the axial floating stroke of the piston, and the piston and the cylinder body are defined to form an assembly that can be disassembled and assembled as a whole.

[0013] In combination with the first aspect and the above-mentioned implementations, in certain implementations of the first aspect, the first end of the piston is provided with a first sealing ring that cooperates with the brake seat, the second end of the piston is provided with a second sealing ring that cooperates with the cylinder body, and the flange is provided with a third sealing ring that cooperates with the brake seat.

[0014] In a second aspect, a machine tool comprises the machine tool clamping mechanism described in any one of the above implementations.

[0015] One of the above technical solutions has at least one of the following advantages or beneficial effects: In the technical solution of the utility model, the piston can move axially under the action of air pressure or oil pressure in the cylinder until the brake pad is pressed and contacts the brake seat, thereby clamping the brake pad to the brake seat. Or the piston can move axially under the action of air pressure or oil pressure in the cylinder, thereby separating the piston from the brake pad, thereby achieving a loosening action. Among them, the first skeleton oil seal and the second skeleton oil seal seal the entire clamping mechanism, which can ensure that no oil leaks into the product, ensure reliable product performance, and effectively prevent the product machine tool from being contaminated by oil stains in the machine tool clamping mechanism.

[0016] Additional aspects and advantages of the present invention will be given in part in the following description, and in part will become apparent from the following description, or will be learned through the practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The above and / or additional aspects and advantages of the present invention will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0018] Figure 1 This is a schematic diagram of the structure of an embodiment of the clamping mechanism of a machine tool of the utility model;

[0019] Figure 2 yes Figure 1 A partial enlarged view of point A in the middle. DETAILED DESCRIPTION

[0020] This section will describe in detail the specific embodiments of the utility model. The preferred embodiments of the utility model are shown in the accompanying drawings. The purpose of the accompanying drawings is to supplement the description of the text part of the specification with graphics, so that people can intuitively and vividly understand each technical feature and the overall technical solution of the utility model, but it cannot be understood as a limitation on the protection scope of the utility model.

[0021] In the present invention, if directions (up, down, left, right, front and back) are described, it is only for the convenience of describing the technical solution of the present invention, and does not indicate or imply that the technical features referred to must have a specific orientation, be constructed and operate in a specific orientation. Therefore, it cannot be understood as a limitation on the present invention.

[0022] In the present utility model, "several" means one or more, "multiple" means more than two, "greater than", "less than", "exceed" and the like are understood to exclude the number itself; "above", "below", "within" and the like are understood to include the number itself. In the description of the present utility model, if there is a description of "first" or "second", it is only used for the purpose of distinguishing technical features, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features or implicitly indicating the order of the indicated technical features.

[0023] In the present invention, unless otherwise clearly defined, the words "set", "install", "connect" and the like should be understood in a broad sense, for example, they can be directly connected or indirectly connected through an intermediate medium; they can be fixedly connected or detachably connected or integrally formed; they can be mechanically connected or electrically connected or able to communicate with each other; they can be the internal connection of two elements or the interaction relationship between two elements. Those skilled in the art can reasonably determine the specific meanings of the above words in the present invention in combination with the specific content of the technical solution.

[0024] in, Figure 1 and Figure 2 The reference direction coordinate system of the embodiment of the utility model is given below. Figure 1 and Figure 2 The embodiment of the utility model is described with reference to the direction shown.

[0025] See also Figure 1 , Figure 2 The embodiment of the utility model provides a machine tool clamping mechanism, including a machine body 100 and a rotary shaft 200, the rotary shaft 200 is rotatably mounted on the machine body 100 through a bearing, the rotary shaft 200 is provided with a brake pad 300, the machine body 100 is provided with a brake seat 101 on a first side of the brake pad 300, the brake seat 101 is located on the left side of the brake pad 300, the machine body 100 is provided with a cylinder body 400 and a piston 500 on a second side of the brake pad 300, the cylinder body 400 and the piston 500 are located on the right side of the brake pad 300, the piston 500 can move axially under the action of air pressure or oil pressure in the cylinder body 400, and then clamp the brake pad 300 on the brake seat 101, or the piston 500 can move axially under the action of air pressure or oil pressure in the cylinder body 400, and then separate the piston 500 from the brake pad 300, thereby realizing a loosening action. Among them, a first skeleton oil seal 600 is provided between the brake seat 101 and the rotating shaft 200 on the first side of the brake pad 300, and a second skeleton oil seal 700 is provided between the cylinder body 400 and the rotating shaft 200 on the second side of the brake pad 300. The first skeleton oil seal 600 and the second skeleton oil seal 700 seal the entire clamping mechanism, which can ensure that no oil leaks into the product, ensure reliable product performance, and effectively prevent the product machine tool from being contaminated by oil stains in the machine tool clamping mechanism.

[0026] The brake pad 300 can be mounted directly or indirectly on the rotating shaft 200. For example, in some embodiments, see Figure 1 , Figure 2 The rotating shaft 200 is provided with a brake pad mounting seat 201, and the brake pad mounting seat 201 has an axial end face, and the axial end face is located on the right end face of the brake pad mounting seat 201. The brake pad 300 is pressed against the axial end face through the brake partition plate 202. In this embodiment, the brake pad 300 is connected with the brake pad mounting seat 201 and the brake partition plate 202 on the left and right sides by establishing a surface, thereby improving the installation stability of the brake pad 300 on the rotating shaft 200.

[0027] In some embodiments, see Figure 1 , Figure 2The brake pad mounting seat 201 is provided with a circular outer peripheral surface at the radial inner side of the brake seat 101, and the brake seat 101 is provided with a first mounting groove 102 at the radial outer side of the brake pad mounting seat 201. The first skeleton oil seal 600 is arranged between the brake seat 101 and the brake pad mounting seat 201, and the first skeleton oil seal 600 is installed in the first mounting groove 102. The first skeleton oil seal 600 is provided with a first elastic sealing lip 601 that fits with the outer peripheral surface of the brake seat 101. The first skeleton oil seal 600 establishes a good seal between the brake seat 101 and the brake pad mounting seat 201, and the first elastic sealing lip 601 fits with the outer peripheral surface of the brake seat 101, thereby effectively preventing oil leakage.

[0028] In some embodiments, see Figure 1 , Figure 2 The cylinder body 400 is provided with a second mounting groove 401 at the radially outer side of the rotary shaft 200, and the second skeleton oil seal 700 is installed in the second mounting groove 401. The second skeleton oil seal 700 is provided with a second elastic sealing lip 701 that fits with the outer peripheral surface of the rotary shaft 200. The second skeleton oil seal 700 establishes a good seal between the cylinder body 400 and the rotary shaft 200, and effectively prevents oil leakage by means of the second elastic sealing lip 701 that fits with the outer peripheral surface of the rotary shaft 200.

[0029] In some embodiments, see Figure 1 , Figure 2 The cylinder body 400 is provided with an annular groove 402 on the end surface facing the brake pad 300, and the annular groove 402 forms a concave cavity on the left end surface of the cylinder body 400. The piston 500 extends axially from the first end to the second end, the first end is the left end in the figure, and the second end is the right end in the figure. The first end is used to clamp the brake pad 300, and the second end is floatingly arranged in the annular groove 402. The piston 500 is provided with a flange 501 extending radially outward, a first oil chamber 502 is provided between the flange 501 and the brake seat 101, a second oil chamber 503 is provided between the flange 501 and the cylinder body 400, the cylinder body 400 is provided with a first joint 403 connected to the first oil chamber 502, and the cylinder body 400 is provided with a second joint 404 connected to the second oil chamber 503.

[0030] For further information, see Figure 1 , Figure 2 An elastic component is provided between the second end of the piston 500 and the cylinder body 400 , and the elastic component is used to provide a force that causes the piston 500 to automatically clamp the brake pad 300 .

[0031] In some embodiments, see Figure 1 , Figure 2The second end of the piston 500 is provided with an axial blind hole, in which a guide pin 800 is provided, and the elastic component includes a disc spring 801 sleeved on the guide pin 800. In this embodiment, the disc spring 801 is used for normal clamping, and a special material seal is used. Through the switching of oil pressure, fast clamping and loosening can be achieved.

[0032] The principle of the embodiment of the utility model is as follows:

[0033] Release: Oil pressure enters the first oil chamber 502 of the piston 500 and the brake seat 101 from the first joint 403. The oil pressure generates thrust to push the piston 500 to move axially to the right, and compresses the disc spring 801 to separate the piston 500 from the brake pad 300, thereby achieving the release action.

[0034] Clamping: Clamping can be divided into self-locking and hydraulic boost clamping.

[0035] Self-locking clamping: After release, the disc spring 801 is compressed to generate energy. When the oil pressure is released, the disc spring 801 restores its own shape, thereby pushing the piston 500 to move to the left until the brake pad 300 is pressed into contact with the brake seat 101, thereby achieving self-locking clamping.

[0036] Oil pressure boost clamping: Oil pressure enters the clamping chamber between the piston 500 and the cylinder body 400 from the second joint 404. The oil pressure generates thrust to push the piston 500 to move axially to the left until the brake pad 300 is pressed into contact with the brake seat 101, thereby realizing the boost clamping function.

[0037] In some embodiments, see Figure 1 , Figure 2 The cylinder body 400 is provided with a pressure plate to limit the floating stroke of the piston 500 in the axial direction, and the piston 500 and the cylinder body 400 are limited to form a component that can be disassembled as a whole. The disc spring 801 and the guide pin 800 are installed on the moving part piston 500, and the axial movement is limited by the pressure plate, which can ensure convenient replacement and installation. The piston 500 and the cylinder body 400 are an overall modular structure, which is convenient for replacement and maintenance.

[0038] In some embodiments, see Figure 1 , Figure 2 The first end of the piston 500 is provided with a first sealing ring that matches the brake seat 101, the second end of the piston 500 is provided with a second sealing ring that matches the cylinder body 400, and the flange 501 is provided with a third sealing ring that matches the brake seat 101. It is ensured that the moving part piston 500 does not leak oil when running axially.

[0039] An embodiment of the utility model further provides a machine tool, comprising the machine tool clamping mechanism in any of the above embodiments.

[0040] Some embodiments of the utility model have the following advantages: the axial force generated by clamping is not transmitted to the shaft system, ensuring that the clamped workpiece moves little. The disc spring 801 stores energy, and special sealing materials are used. The small piston has a stroke of 500, which can achieve normal self-locking (to prevent the risk of power failure and collision) and rapid release and clamping (comparable to the speed of pneumatic action). At the same time, the service life is up to 800,000 times, which is enough to meet the long-term use requirements of the machine tool. The overall modular structure is convenient for replacement and maintenance.

[0041] In the description of this specification, the description with reference to the terms "example", "embodiment" or "some embodiments" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the utility model. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0042] Of course, the invention is not limited to the above-mentioned embodiments, and those skilled in the art may make equivalent modifications or substitutions without violating the spirit of the invention, and these equivalent modifications or substitutions are all included in the scope defined by the claims of this application.

Claims

1. A machine tool clamping mechanism, characterized in that: It includes a body and a rotating shaft, the rotating shaft is provided with a brake pad, the body is provided with a brake seat on the first side of the brake pad, the body is provided with a cylinder body and a piston on the second side of the brake pad, a first skeleton oil seal is provided between the brake seat and the rotating shaft on the first side of the brake pad, and a second skeleton oil seal is provided between the cylinder body and the rotating shaft on the second side of the brake pad.

2. The machine tool clamping mechanism according to claim 1, characterized in that: The rotary shaft is provided with a brake pad mounting seat, and the brake pad mounting seat has an axial end surface, and the brake pad is pressed against the axial end surface through a brake partition.

3. The machine tool clamping mechanism according to claim 2, characterized in that: The brake pad mounting seat is provided with a circular outer circumferential surface at the radial inner side of the brake seat, and the brake seat is provided with a first mounting groove at the radial outer side of the brake pad mounting seat. The first skeleton oil seal is arranged between the brake seat and the brake pad mounting seat, and the first skeleton oil seal is installed in the first mounting groove. The first skeleton oil seal is provided with a first elastic sealing lip that fits with the outer circumferential surface of the brake seat.

4. The machine tool clamping mechanism according to claim 1, characterized in that: The cylinder body is provided with a second mounting groove at a radially outer position of the rotary shaft, the second skeleton oil seal is installed in the second mounting groove, and the second skeleton oil seal is provided with a second elastic sealing lip which is in contact with the outer peripheral surface of the rotary shaft.

5. The machine tool clamping mechanism according to claim 1, characterized in that: The cylinder body is provided with an annular groove on the end surface facing the brake pad, the piston extends axially from the first end to the second end, the first end is used to clamp the brake pad, and the second end is floatingly arranged in the annular groove, the piston is provided with a flange extending radially outward, a first oil chamber is provided between the flange and the brake seat, a second oil chamber is provided between the flange and the cylinder body, the cylinder body is provided with a first joint connected to the first oil chamber, and the cylinder body is provided with a second joint connected to the second oil chamber.

6. The machine tool clamping mechanism according to claim 5, characterized in that: An elastic component is provided between the second end of the piston and the cylinder body, and the elastic component is used to provide a force that causes the piston to automatically clamp onto the brake pad.

7. The machine tool clamping mechanism according to claim 6, characterized in that: An axial blind hole is provided at the second end of the piston, a guide pin is provided in the axial blind hole, and the elastic component comprises a disc spring sleeved on the guide pin.

8. The machine tool clamping mechanism according to claim 7, characterized in that: The cylinder body is provided with a pressure plate for limiting the floating stroke of the piston in the axial direction, and the piston and the cylinder body are defined to form a component that can be disassembled and assembled as a whole.

9. The machine tool clamping mechanism according to claim 5, characterized in that: The first end of the piston is provided with a first sealing ring matched with the brake seat, the second end of the piston is provided with a second sealing ring matched with the cylinder body, and the flange is provided with a third sealing ring matched with the brake seat.

10. A machine tool, characterized in that: The invention comprises the machine tool clamping mechanism according to any one of claims 1 to 9.

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