Clamping tool for brake drum machining

Abstract

The clamping tool for brake drum machining comprises a workbench, an inner clamping mechanism and a plurality of outer clamping mechanisms are arranged at the top of the workbench, the multiple outer clamping mechanisms are distributed around the inner clamping mechanism in an annular array mode, the outer clamping mechanisms are used for pressing the outer side wall of the brake drum, and the inner clamping mechanism is used for pressing the inner side wall of the brake drum; the inner clamping mechanism comprises an inflation box arranged at the top of the workbench, the bottom of the inflation box is connected with air supply equipment, the outer side wall of the inflation box communicates with a plurality of guide pipes distributed in an annular array mode, pneumatic clamping rods are movably arranged in the guide pipes, and the pneumatic clamping rods correspond to the outer clamping mechanisms one to one. And one end of the pneumatic clamping rod extends out of the guide pipe and is used for pressing the inner side wall of the brake drum. The brake drum clamping device has the advantages that internal and external synchronous clamping can be carried out, and the risk of mechanical deformation of the brake drum is reduced.

Description

Technical Field

[0001] This application relates to the field of brake drum processing technology, and in particular to a clamping fixture for brake drum processing. Background Technology

[0002] The brake drum is the friction pair component of a drum brake. Besides possessing the strength and rigidity required of a component, it should also have a high and stable coefficient of friction, as well as appropriate wear resistance, heat resistance, heat dissipation, and heat capacity. Multiple holes arranged in a ring array need to be drilled into the brake drum. During drilling, the brake drum needs to be fixed in place. Existing clamping mechanisms clamp the drum from its outer wall. However, the sidewall of the brake drum is relatively thin, and prolonged clamping poses a risk of mechanical deformation. Reducing the clamping force leads to insecure clamping, affecting machining quality and ultimately resulting in a lower quality brake drum. Utility Model Content

[0003] The main purpose of this application is to provide a clamping fixture for processing brake drums, which aims to solve the technical problem that existing clamping mechanisms can easily cause mechanical deformation of brake drums when clamped from the outside.

[0004] To achieve the above objectives, this application provides a clamping fixture for processing brake drums, including a worktable. An inner clamping mechanism and multiple outer clamping mechanisms are provided on the top of the worktable. The multiple outer clamping mechanisms are arranged in a circular array around the inner clamping mechanism. The outer clamping mechanisms are used to press the outer side wall of the brake drum, and the inner clamping mechanisms are used to press the inner side wall of the brake drum. The inner clamping mechanism includes an air box disposed on the top of the worktable. An air supply device is connected to the bottom of the air box. Multiple guide tubes arranged in a circular array are connected to the outer side wall of the air box. Pneumatic clamping rods are movably disposed in the guide tubes. The pneumatic clamping rods correspond one-to-one with the outer clamping mechanisms, and one end of the pneumatic clamping rod extends out of the guide tube and is used to press the inner side wall of the brake drum.

[0005] Optionally, the pneumatic clamping rod includes a piston slidably disposed in a guide tube, with a push rod connected to the end of the piston away from the air box. The push rod extends movably out of the guide tube and is connected to a first clamping block, which is used to press against the inner wall of the brake drum.

[0006] Optionally, the outer clamping mechanism includes a telescopic cylinder disposed on the top of the worktable, and a second clamping block corresponding to the first clamping block is connected to one end of the telescopic cylinder near the inner clamping mechanism.

[0007] Optionally, both the first clamping block and the second clamping block are arc-shaped structures, and both the first clamping block and the second clamping block are made of rubber.

[0008] Optionally, the air supply equipment includes an air inflator located at the bottom of the workbench, the air inflator being connected to a first air pipe that passes through the workbench and is connected to the bottom of the air inflator box.

[0009] Optionally, the top of the air box is provided with a positioning frustum, which is used to mate with the center hole of the brake drum.

[0010] Optionally, the positioning truncated cone is an airbag, and an air nozzle is provided on the airbag.

[0011] Optionally, the inflator is connected to a three-way solenoid valve, a first air tube is connected to the three-way solenoid valve, the three-way solenoid valve is also connected to a second air tube, and the second air tube is connected to an air needle that mates with the air nozzle.

[0012] Optionally, a vacuum cleaner is installed at the bottom of the workbench, and a vacuum pipe is connected to the top of the vacuum cleaner inside the workbench. Multiple chip removal channels are opened inside the workbench and are connected to the top surface of the workbench. The top of the chip removal channels is connected to the top surface of the workbench, and the top of the chip removal channels is within the coverage area of ​​the brake drum on the top surface of the workbench.

[0013] The beneficial effects that this application can achieve are as follows:

[0014] This application, by setting an external clamping mechanism and an internal clamping mechanism, can simultaneously press and fix the inner and outer walls of the brake drum. By pressing the inner and outer walls of multiple clamping points of the brake drum simultaneously, not only is the clamping reliable, but the risk of mechanical deformation of the brake drum caused by external single-sided clamping is also greatly reduced. When the internal clamping mechanism clamps, compressed gas is injected into the air box through the air supply device, thereby pushing all pneumatic clamping rods to extend out of the guide tube and press against the inner wall of the brake drum, achieving one-time clamping, making the operation more convenient and faster. Attached Figure Description

[0015] To more clearly illustrate the technical solutions in the specific embodiments of this application or the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. In all the drawings, similar elements or parts are generally identified by similar reference numerals. In the drawings, the elements or parts are not necessarily drawn to scale.

[0016] Figure 1 This is a schematic diagram of the structure of a clamping fixture for processing a brake drum according to an embodiment of this application;

[0017] Figure 2 This is a schematic diagram of the external structure of a clamping fixture for processing a brake drum according to an embodiment of this application (when the brake drum is not clamped);

[0018] Figure 3 This is a schematic diagram (top view) of the internal clamping mechanism in an embodiment of this application.

[0019] Figure label:

[0020] 110-Workbench, 111-Chip removal channel, 120-Inner clamping mechanism, 121-Inflation box, 122-Guide tube, 123-Piston, 124-Push rod, 125-First clamping block, 130-Outer clamping mechanism, 131-Telescopic cylinder, 132-Second clamping block, 140-Air supply equipment, 141-Inflator, 142-First air pipe, 143-Three-way solenoid valve, 150-Positioning frustum, 151-Air nozzle, 160-Second air pipe, 161-Air needle, 170-Vacuum cleaner, 180-Vacuum suction pipe, 190-Brake drum.

[0021] The realization of the purpose, functional features and advantages of this application will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0022] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of the embodiments. Based on the embodiments of this application, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of this application.

[0023] It should be noted that all directional indications (such as up, down, left, right, front, back, etc.) in the embodiments of this application are only used to explain the relative positional relationship and movement of each component in a certain specific posture. If the specific posture changes, the directional indication will also change accordingly.

[0024] In this application, unless otherwise expressly specified and limited, the terms "connection," "fixed," etc., should be interpreted broadly. For example, "connection" can be a fixed connection, a detachable connection, or an integral part; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be the internal communication of two components or the interaction between two components, unless otherwise expressly limited. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0025] Furthermore, if the embodiments of this application involve descriptions such as "first" or "second," these descriptions are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, the meaning of "and / or" throughout the text includes three parallel solutions; for example, "A and / or B" includes solution A, solution B, or a solution where both A and B are satisfied simultaneously. Furthermore, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed in this application.

[0026] Example

[0027] Reference Figures 1-3 This embodiment provides a clamping fixture for processing brake drums, including a worktable 110. The top of the worktable 110 is provided with an inner clamping mechanism 120 and a plurality of outer clamping mechanisms 130. The plurality of outer clamping mechanisms 130 are arranged in a ring array around the inner clamping mechanism 120. The outer clamping mechanisms 130 are used to press the outer side wall of the brake drum 190, and the inner clamping mechanism 120 is used to press the inner side wall of the brake drum 190. The inner clamping mechanism 120 includes an air box 121 disposed on the top of the worktable 110. The bottom of the air box 121 is connected to an air supply device 140. The outer side wall of the air box 121 is connected to a plurality of guide tubes 122 arranged in a ring array. A pneumatic clamping rod is movably disposed in the guide tube 122. The pneumatic clamping rod corresponds one-to-one with the outer clamping mechanism 130, and one end of the pneumatic clamping rod extends out of the guide tube 122 and is used to press the inner side wall of the brake drum 190.

[0028] In this embodiment, during clamping, the brake drum 190 is inverted and placed above the inner clamping mechanism 120. At this time, the inner clamping mechanism 120 is located in the internal space of the brake drum 190. By setting the outer clamping mechanism 130 and the inner clamping mechanism 120, the inner and outer walls of the brake drum 190 can be pressed and fixed simultaneously. By pressing the inner and outer walls of multiple clamping points of the brake drum 190 simultaneously, not only is the clamping reliable, but the risk of mechanical deformation of the brake drum 190 caused by external unilateral clamping is also greatly reduced. When the inner clamping mechanism 120 clamps, compressed gas is injected into the air box 121 through the air supply device 140, thereby pushing all the pneumatic clamping rods to extend out of the guide tube 122 and press against the inner wall of the brake drum 190. This achieves clamping of the inner wall in the narrow internal space of the brake drum 190. The clamping force can be controlled by controlling the amount of compressed gas entering the air box 121, making the operation convenient and quick.

[0029] As an optional implementation, the pneumatic clamping rod includes a piston 123 slidably disposed in the guide tube 122. One end of the piston 123 away from the air box 121 is connected to a push rod 124. The push rod 124 extends movably out of the guide tube 122 and is connected to a first clamping block 125. The first clamping block 125 is used to press against the inner wall of the brake drum 190.

[0030] In this embodiment, when the air box 121 is filled with compressed gas, it simultaneously pushes the piston 123 in the guide tube 122 to slide outward, thereby causing the push rod 124 to extend out of the guide tube 122 until all the first clamping blocks 125 press against the inner wall of the brake drum 190, thus achieving the effect of multi-point synchronous pressing.

[0031] As an optional implementation, the outer clamping mechanism 130 includes a telescopic cylinder 131 disposed on the top of the worktable 110, and a second clamping block 132 corresponding to the first clamping block 125 is connected to one end of the telescopic cylinder 131 near the inner clamping mechanism 120.

[0032] In this embodiment, when external clamping is required, the telescopic end of the telescopic cylinder 131 (which can be a pneumatic cylinder or a hydraulic cylinder) drives the second clamping block 132 to automatically approach and press against the outer side wall of the brake drum 190, and clamps it internally and externally at the same clamping point as the first clamping block 125. The degree of automation is high and the clamping efficiency is high.

[0033] As an optional implementation, both the first clamping block 125 and the second clamping block 132 are arc-shaped structures, and both the first clamping block 125 and the second clamping block 132 are made of rubber.

[0034] In this embodiment, the arc-shaped first clamping block 125 and second clamping block 132 can improve the fit with the brake drum 190, while the rubber material of the first clamping block 125 and second clamping block 132 can reduce the wear caused by mechanical clamping and further improve the surface quality of the brake drum 190.

[0035] As an optional implementation, the air supply device 140 includes an air inflator 141 disposed at the bottom of the workbench 110. The air inflator 141 is connected to a first air pipe 142, which passes through the workbench 110 and is connected to the bottom of the air inflator box 121.

[0036] In this embodiment, when air needs to be supplied to the air box 121, the air inflator 141 can fill the air box 121 with gas through the first air pipe 142 to achieve automatic inflation. The air inflator 141 is also called an air pump or air compressor. It also has an air extraction function. After the hole making process is completed, it can extract air to generate negative pressure to retract the pneumatic clamping rod, thereby releasing the internal clamping effect on the brake drum 190 and meeting the needs of quick clamping and release.

[0037] As an optional implementation, the top of the air box 121 is provided with a positioning frustum 150, which is used to cooperate with the center hole of the brake drum 190.

[0038] In this embodiment, since the brake drum 190 has a central hole that mates with other components, when the brake drum 190 is clamped upside down on the worktable 110, the central hole of the brake drum 190 can be aligned with the positioning frustum 150 for quick positioning and installation.

[0039] As an optional implementation, the positioning frustum 150 is an airbag with an air nozzle 151. The airbag can be inflated by an inflation device to make the airbag expand. Depending on the degree of expansion, it can be adapted to the center hole positioning of brake drums 180 of different specifications, thus improving versatility.

[0040] As an optional implementation, the inflator 141 is connected to a three-way solenoid valve 143, the first air pipe 142 is connected to the three-way solenoid valve 143, the three-way solenoid valve 143 is also connected to a second air pipe 160, and the second air pipe 160 is connected to an air needle 161 that cooperates with the air nozzle 151.

[0041] In this embodiment, the gas delivery of different pipelines can be switched by the three-way solenoid valve 143. When the airbag needs to be inflated, only the second air pipe 160 is connected, and the air needle 161 is inserted into the air nozzle 151 to perform the inflation operation. Similarly, when internal clamping is required, only the first air pipe 142 is connected to introduce gas into the inflation box 121. Therefore, a single inflation machine 141 can be used, reducing equipment costs.

[0042] As an optional implementation, a vacuum cleaner 170 is provided at the bottom of the workbench 110, and a vacuum pipe 180 located inside the workbench 110 is connected to the top of the vacuum cleaner 170. Multiple chip removal channels 111 connected to the vacuum pipe 180 are opened inside the workbench 110. The top of the chip removal channels 111 is connected to the top surface of the workbench 110, and the top of each chip removal channel 111 is located within the coverage area of ​​the brake drum 190 on the top surface of the workbench 110.

[0043] In this embodiment, dust is generated during the hole-making process. Since the brake drum 190 is clamped upside down on the worktable 110, the brake drum 190 and the worktable 110 form a relatively sealed space. To prevent dust from entering the air box 121 and causing blockage of the guide tube 122, which would reduce the mobility of the pneumatic clamping rod, the relatively sealed internal space of the brake drum 190 can be cleaned by a vacuum cleaner 170, a vacuum pipe 180, and multiple chip removal channels 111. The multiple chip removal channels 111 can be arranged in a ring array, so that the suction ports at the top are evenly spaced to ensure the dust removal effect.

[0044] It should be noted that the chip discharge channels 111 can all be arranged at a downward angle to ensure that dust can smoothly enter the suction pipe 180 and avoid dust accumulation and blockage in the chip discharge channels 111.

[0045] The above are merely preferred embodiments of this application and do not limit the patent scope of this application. Any equivalent structural or procedural transformations made using the content of this application's specification and drawings, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of this application.

Claims

1. A clamping fixture for machining a brake drum, characterized in that, The system includes a worktable, on the top of which is an inner clamping mechanism and multiple outer clamping mechanisms. The multiple outer clamping mechanisms are arranged in a circular array around the inner clamping mechanism. The outer clamping mechanisms are used to press against the outer wall of the brake drum, and the inner clamping mechanisms are used to press against the inner wall of the brake drum. The inner clamping mechanism includes an air box disposed on the top of the workbench. An air supply device is connected to the bottom of the air box. Multiple guide tubes arranged in a ring array are connected to the outer wall of the air box. A pneumatic clamping rod is movably disposed in the guide tube. The pneumatic clamping rod corresponds one-to-one with the outer clamping mechanism, and one end of the pneumatic clamping rod extends out of the guide tube and is used to press against the inner wall of the brake drum.

2. The clamping fixture for processing a brake drum as described in claim 1, characterized in that, The pneumatic clamping rod includes a piston that is slidably disposed in the guide tube. A push rod is connected to one end of the piston away from the air box. The push rod extends movably out of the guide tube and is connected to a first clamping block. The first clamping block is used to press against the inner wall of the brake drum.

3. The clamping fixture for processing a brake drum as described in claim 2, characterized in that, The external clamping mechanism includes a telescopic cylinder disposed on the top of the workbench, and a second clamping block corresponding to the first clamping block is connected to one end of the telescopic cylinder near the internal clamping mechanism.

4. The clamping fixture for processing a brake drum as described in claim 3, characterized in that, Both the first clamping block and the second clamping block have an arc-shaped structure, and both are made of rubber.

5. A clamping fixture for machining a brake drum as described in any one of claims 1-4, characterized in that, The air supply device includes an air inflator located at the bottom of the workbench. The air inflator is connected to a first air pipe, which passes through the workbench and is connected to the bottom of the air inflator box.

6. The clamping fixture for processing a brake drum as described in claim 5, characterized in that, The top of the air box is provided with a positioning frustum, which is used to cooperate with the center hole of the brake drum.

7. The clamping fixture for processing a brake drum as described in claim 6, characterized in that, The positioning truncated cone is an airbag, and the airbag is equipped with an air nozzle.

8. The clamping fixture for processing a brake drum as described in claim 7, characterized in that, The inflator is connected to a three-way solenoid valve. The first air pipe is connected to the three-way solenoid valve. The three-way solenoid valve is also connected to a second air pipe, which is connected to an air needle that cooperates with the air nozzle.

9. The clamping fixture for processing a brake drum as described in claim 1, characterized in that, A vacuum cleaner is installed at the bottom of the workbench, and a suction pipe is connected to the top of the vacuum cleaner inside the workbench. Multiple chip removal channels are opened inside the workbench and communicate with the suction pipe. The top of the chip removal channels is connected to the top surface of the workbench, and the top of the chip removal channels is located within the coverage area of ​​the brake drum on the top surface of the workbench.

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