Clamping device for machining shoe surface of brake shoe

Abstract

The invention relates to the technical field of brake shoe machining machinery, in particular to a clamping device for machining a shoe surface of a brake shoe, which comprises a base, a through hole is formed in the side wall of the base, a first clamping jaw and a second clamping jaw which are oppositely arranged are arranged outside the base, and a connecting block and a driving mechanism are arranged inside the base. One end of the first clamping jaw and one end of the second clamping jaw penetrate through the through holes to be rotationally connected with the connecting block, and a first positioning column and a cushion block are arranged at one end of the base. The first clamping jaw and the second clamping jaw are oppositely arranged to form a symmetrical clamping structure, the clamping force is symmetrically distributed along the axis in cooperation with transmission connection of the connecting block and the driving mechanism, when the driving mechanism pulls the connecting block, synchronous reverse movement is generated through the rotationally-connected clamping jaws, and symmetrical clamping force distribution along the axis of the brake shoe is formed; and the stress on two sides of the rib plate of the brake shoe is balanced. The device is reasonable in design and convenient to use, and the machining precision of the rib plate of the brake shoe is greatly improved.

Description

Technical Field

[0001] The present invention relates to the technical field of brake shoe processing machinery, in particular to a clamping device for processing the shoe surface of a brake shoe. Background Art

[0002] In automotive braking systems, brake shoes are the core actuators of drum brakes, and their machining quality is directly related to vehicle braking performance and driving safety. In particular, the machining accuracy of the brake shoe surface (including the outer arc surface and both end faces) not only affects the braking effect of the drum brake but also directly determines the service life of the friction pad. During the machining of the brake shoe surface, the reliability and accuracy of the clamping process are crucial.

[0003] Although some brake shoe processing fixtures have been disclosed in the prior art, there are still obvious deficiencies: First, during the clamping process, in order to compress the brake shoe, it is usually necessary to apply pressure along the axial direction of the brake shoe to fix it on the base. This clamping method will cause uneven force on both sides of the brake shoe plate, resulting in a large deviation in the accuracy of the brake shoe surface, which in turn affects the overall processing accuracy of the brake shoe. Second, the structural design of the existing clamping device is relatively fixed. When faced with brake shoes of different sizes, the operator needs to manually replace a large number of key components that affect the fixing accuracy. This process is not only cumbersome and time-consuming, but the frequent replacement of key components will reduce the accuracy of the clamping device, thereby affecting the processing quality of the brake shoe. Therefore, in order to ensure the processing accuracy of the brake shoe, it is of great significance to design a clamping device for brake shoe surface processing to meet the requirements of the automobile braking system for high-precision processing of brake shoes. Summary of the Invention

[0004] The purpose of the present invention is to provide a clamping device for machining the shoe surface of a brake shoe in order to address the deficiencies of the prior art and solve the above-mentioned technical problems.

[0005] The technical solution adopted by the present invention to solve its technical problems is: a clamping device for processing the shoe surface of a brake shoe, comprising a base, a cavity is provided inside the base, a through hole is provided on the side wall of the base, a first clamping claw and a second clamping claw arranged opposite to each other are provided on the outside of the base, a connecting block and a driving mechanism are provided inside the cavity, one end of the first clamping claw and the second clamping claw passes through the through hole and is rotatably connected to the connecting block, when the driving mechanism drives the connecting block to move radially along the base, the connecting block drives the first clamping claw and the second clamping claw to move toward or oppositely along the axial direction of the base, a first positioning column and a pad block are provided at one end of the base, and the pad block and the first positioning column are respectively located at the two ends of the first clamping claw and the second clamping claw.

[0006] Furthermore, a telescopic spring is provided between the first clamping claw and the second clamping claw, and the axial direction of the telescopic spring is consistent with the axial direction of the base.

[0007] Furthermore, the first clamping claw and the second clamping claw are respectively provided with a deep groove for accommodating the telescopic spring.

[0008] Furthermore, the outer walls of the first clamping jaw and the second clamping jaw are arc surfaces or inclined surfaces.

[0009] Furthermore, when the first clamping jaw and the second clamping jaw are in an open state, the maximum distance between the outer walls of the first clamping jaw and the second clamping jaw is greater than the length of the through hole.

[0010] Furthermore, support columns are provided at both ends of the base, the support columns are connected to the threads, and the axes of the support columns are perpendicular to the axis of the base.

[0011] Furthermore, the first positioning column and the cushion block are respectively connected to the base through an adjustment plate. The base and the adjustment plate are correspondingly provided with a plurality of connection holes. The adjustment plate is connected to the base through bolts.

[0012] Furthermore, a guide unit is provided inside the cavity for guiding the movement of the connecting block.

[0013] Furthermore, in the circumferential direction of the base, the base is provided with two groups of the first claws, the second claws, the connecting holes, the first positioning columns and the pads.

[0014] Furthermore, the driving mechanism drives the two groups of connecting blocks to move synchronously in the same direction or in opposite directions.

[0015] The beneficial effects of the present invention are: 1. The present invention utilizes symmetrically arranged first and second clamping jaws, which pass through a through hole and are simultaneously hinged to a connecting block within the base. When the connecting block pulls the first and second clamping jaws toward the interior of the base, the first and second clamping jaws simultaneously clamp the brake shoe's ribs from both sides. This ensures that the brake shoe's ribs are evenly stressed during the clamping process, significantly reducing clamping flatness errors and thus significantly reducing brake shoe machining errors, thereby facilitating the machining accuracy of the brake shoe's outer arc surface and both end faces. 2. During the clamping process, the present invention forms a precise and stable clamping force on the first and second clamping jaws through the through hole and the telescopic spring when clamping the brake shoe, thereby enhancing the stability and reliability of the brake shoe clamping, avoiding the influence of vibration or loose clamping during the processing on the brake shoe processing accuracy, and further facilitating the processing accuracy of the outer arc surface and both ends of the brake shoe plate; 3. The cooperation between the first clamping jaw, the second clamping jaw and the through hole is the core key mechanism for clamping and fixing the brake shoe of the present invention. For brake shoes of different sizes, the present invention does not need to replace key components such as the clamping jaws, and can achieve the applicability of brake shoes of different sizes, thereby improving the efficiency of clamping and changing, and helping to ensure the clamping accuracy. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a structural schematic diagram of the present invention.

[0017] Figure 2 It is the front view of the present invention.

[0018] Figure 3 It is a top view of the present invention.

[0019] Figure 4 It is a side view of the present invention.

[0020] Description of reference numerals: 1 - base, 11 - cavity, 12 - through hole, 2 - first claw, 3 - second claw, 4 - connecting block, 5 - first positioning column, 6 - cushion block, 7 - telescopic spring, 8 - support column, 9 - adjustment plate, 10 - guide unit. DETAILED DESCRIPTION

[0021] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments, but the scope of implementation of the present invention is not limited thereto.

[0022] It should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings and are intended solely to facilitate and simplify the description of the present invention. They are not intended to indicate or imply that the devices or components referred to must have, be constructed, or operate in a specific orientation, and therefore should not be construed as limitations on the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0023] In the description of the present invention, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood in a broad sense. For example, they may refer to fixed, detachable, or integral connections; mechanical or electrical connections; direct or indirect connections through an intermediate medium; and internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on the specific circumstances.

[0024] like Figure 1-Figure 4As shown, a clamping device for machining the shoe surface of a brake shoe of this embodiment includes a base 1, a cavity 11 is provided inside the base 1, a through hole 12 is provided on the side wall of the base 1, and a first clamping claw 2 and a second clamping claw 3 are provided on the outside of the base 1. That is, along the axis direction of the base 1, the first clamping claw 2 and the second clamping claw 3 are relatively arranged. A connecting block 4 and a driving mechanism are provided inside the cavity 11. The driving mechanism is a cylinder, a hydraulic cylinder, a screw rod or a gear transmission mechanism. The driving mechanism drives the connecting block 4 to reciprocate along the radial direction of the base 1. The first and second jaws 2 and 3 are connected to the connecting block 4 through the through hole 12 and are rotatably connected. When the driving mechanism drives the connecting block 4 to move radially along the base 1, the connecting block 4 drives the first and second jaws 2 and 3 to move toward or in opposite directions along the axis of the base 1. A first positioning post 5 and a pad 6 are provided at one end of the base 1. The pad 6 and the first positioning post 5 are located at opposite ends of the jaws, respectively. The axis of the first positioning post 5 is parallel to the axis of the base 1, and the upper surface of the pad 6 is perpendicular to the axis of the base 1. In the present invention, a symmetrical clamping structure is formed by the relative arrangement of the first and second jaws 2 and 3. The transmission connection between the connecting block 4 and the driving mechanism ensures that the clamping force is symmetrically distributed along the axis. The connecting block 4, which is disposed within the cavity 11, acts as a motion conversion mechanism, converting the linear motion of the driving mechanism into a rotational clamping action of the jaws. When the driving mechanism pulls the connecting block 4, the rotating connected jaws generate synchronous reverse motion, forming a symmetrical clamping force distribution along the brake shoe axis, which balances the force on both sides of the brake shoe's rib.

[0025] A telescopic spring 7 is provided between the first and second jaws 2, 3. The axial direction of the telescopic spring 7 is consistent with the axial direction of the base 1. The consistent axial direction means that the center line of the telescopic spring 7 is parallel or nearly parallel to the center line of the base. By providing a telescopic spring 7 with an axial direction consistent with the base 1 between the first and second jaws 2, 3, which are arranged opposite to each other, the first and second jaws 2, 3 can provide opposite forces to the first and second jaws 2, 3 through the elastic deformation of the spring during the clamping process, so that the first and second jaws 2, 3 come into contact with the inner wall of the through hole 12, thereby providing uniform clamping force and ensuring clamping stability. At the same time, during the opening process of the first and second jaws 2, 3, the telescopic spring 7 can separate the first and second jaws 2, 3, thereby facilitating the separation of the brake shoe from the first and second jaws 2, 3.

[0026] Furthermore, when the drive mechanism drives the connecting block 4, which moves the jaws toward the axis of the base 1, the first and second jaws 2 and 3 simultaneously retract inward, constrained by the telescopic spring 7. Because the axis of the telescopic spring 7 aligns with that of the base 1, the spring's compression deformation occurs only in the clamping direction, ensuring that the clamping force exerted by the two jaws on the brake shoe is equal and symmetrical. During the clamping process, if there are differences in brake shoe size, the elastic deformation of the spring automatically compensates for the jaw spacing, maintaining a balanced clamping force, making it suitable for clamping brake shoes of varying sizes.

[0027] The first and second jaws 2 and 3 are each provided with a deep groove for accommodating the telescopic spring 7. These grooves facilitate the securing of the telescopic spring 7, allowing the spring 7 to contract when the first and second jaws 2 and 3 move toward each other to clamp the brake shoe rib. When the first and second jaws 2 and 3 move in opposite directions, the spring 7, under its elastic force, separates the first and second jaws 2 and 3, thereby releasing the brake shoe rib. Furthermore, by providing symmetrically distributed deep grooves on the jaws, the axis of the telescopic spring 7 is aligned with the axis of the base 1, i.e., the axis of the deep grooves is parallel or substantially parallel to the axis of the base. This ensures that the direction of the elastic force generated by the spring coincides with the clamping direction, ensuring uniform clamping force and stability at both ends of the rib. A gap is provided between the connecting ends of the first and second jaws 2 and 3. When the drive mechanism compresses the telescopic spring 7, the spring undergoes varying amounts of deformation, enabling the jaws to be used for clamping brake shoes of varying sizes.

[0028] The outer walls of the first clamping jaw 2 and the second clamping jaw 3 are inclined surfaces or arc-shaped surfaces, and their function is to drive the first clamping jaw 2 and the second clamping jaw 3 to move toward each other in the connecting block 4, so that the first clamping jaw 2 and the second clamping jaw 3 are pulled into the through hole 12, thereby realizing the clamping effect of the first clamping jaw 2 and the second clamping jaw 3 on the rib plate of the brake shoe. At the same time, when the first clamping jaw 2 and the second clamping jaw 3 clamp the rib plate of the brake shoe relative to each other from both sides, it is conducive to the outer walls of the first clamping jaw 2 and the second clamping jaw 3 to form a conflict with the inner walls at both ends of the through hole 12, so that the first clamping jaw 2 and the second clamping jaw 3 work together with the through hole 12 of the base 1 to form a wedge effect to enhance the clamping force, and generate a self-locking effect during the clamping process, which is conducive to significantly improving the clamping stability of the rib plate of the brake shoe, thereby avoiding the vibration during the processing from affecting the processing accuracy of the brake shoe.

[0029] When the first jaw 2 and the second jaw 3 are in the open state, the maximum distance between the outer walls of the first jaw 2 and the second jaw 3 is greater than the length of the through hole 12. The length of the through hole 12 is along the axial direction of the base 1. The limitation between the length of the through hole 12 and the maximum distance between the outer walls when the first jaw 2 and the second jaw 3 are in the open state is beneficial to the outer walls of the first jaw 2 and the second jaw 3 and the inner wall of the through hole 12 in the process of clamping the rib plate of the brake shoe, so that the first jaw 2 and the second jaw 3 are radially constrained by the side walls of the through hole 12 during the process of contracting toward each other, resulting in a self-locking effect, thereby significantly enhancing the clamping force of the jaws on the rib plate of the brake shoe.

[0030] Support columns 8 are provided at both ends of the base 1, and the support columns 8 are connected to the threads, and the axes of the support columns 8 are perpendicular to the axes of the base 1. After the first clamping jaw 2 and the second clamping jaw 3 clamp and fix the brake shoe, the support columns 8 contact the inner arc surface of the shoe plate of the brake shoe to support both sides of the shoe plate. Preferably, at least two support columns 8 are provided on each side of the shoe plate of the brake shoe. At the same time, the support columns 8 connected by threads can realize the rapid adaptation capability of the clamping device to brake shoes of different sizes. The support columns 8 provided at both ends of the base 1 are connected by threads, so that the support columns 8 can be adjusted in a plane perpendicular to the axial direction of the base 1, thereby being suitable for the adaptation of brake shoes of different sizes.

[0031] The first locating post 5 and the pad 6 are connected to the base 1 via an adjustment plate 9. The base 1 and the adjustment plate 9 are each provided with a plurality of corresponding connection holes. The adjustment plate 9 is bolted to the base 1. When producing brake shoes of different sizes, the position of the first locating post 5 and the pad 6 can be adjusted via the adjustment plate 9 to accommodate brake shoes of varying sizes. The corresponding connection holes on the base 1 and the adjustment plate 9 allow the adjustment plate 9 to be locked in place using screws at different hole positions. This multi-hole adjustment structure allows for the selection of corresponding connection hole positions for fixation according to the size of the brake shoe, thereby varying the relative distance between the first locating post 5 and the pad 6. The first locating post 5 and the pad 6 serve as auxiliary support components for the clamping mechanism of the present invention. Their function is to fit over the first locating post 5 via an axial hole at one end of the rib plate, while the pad 6 supports the other end of the rib plate, achieving pre-positioning and support for the brake shoe. This assists in cooperating with core clamping components such as the first and second jaws 2 and 3. Because the auxiliary support components are not involved in direct contact and force transmission between the clamping jaws and the brake shoe tendon plate, the bidirectional balanced clamping characteristics of the first clamping jaw 2 and the second clamping jaw 3 remain stable even when the auxiliary support components such as the first positioning column 5 and the spacer 6 are replaced when using brake shoes of different specifications. This not only facilitates universal clamping, but also ensures clamping accuracy and stability.

[0032] A guide unit 10 is provided inside the cavity 11. The guide unit 10 may be a guide rod, and at least two guide rods pass through the connecting block 4 and contact the inner wall of the cavity 11, or the guide unit 10 may be a fixed frame, and the connecting block 4 slides in the fixed frame to limit the moving direction of the connecting block 4, so that the connecting hole drives the first clamping jaw 2 and the second clamping jaw 3 to realize the opening and closing clamping action.

[0033] Along the circumferential direction of the base 1, the base 1 is provided with two groups of the first clamping claws 2, the second clamping claws 3, the connecting holes, the first positioning columns 5 and the pads 6, that is, the base 1 can realize the clamping of two brake shoes, thereby improving the processing efficiency.

[0034] The driving mechanism drives the two groups of connecting blocks 4 to move synchronously in the same direction or in opposite directions. The driving mechanism includes a driving device and a driving rod. One end of the driving rod is connected to the connecting block 4, and the other end is connected to the driving device. Preferably, the driving rod is hinged to the connecting block 4. The driving device can be a cylinder, a hydraulic cylinder or an electric push rod. By driving one end of the driving rod to move axially along the base 1, under the action of the guide unit 10, the connecting block 4 is pulled to move, thereby realizing the opening and closing of the first claw 2 and the second claw 3; or the driving device rotates through gears, such as the gear is sleeved on the outside of the transmission sleeve, and the two ends of the transmission sleeve are respectively connected by forward and reverse threads, thereby realizing the movement of the driving connecting block 4.

[0035] The working principle of the present invention is: one end of the rib of the brake shoe is put on the first positioning column 5, and the other end is supported by the pad 6, so that the rib of the brake shoe is placed in the clamping area between the first claw 2 and the second claw 3; under the action of the driving mechanism, the driving connecting block 4 is moved toward the inside of the base 1, and under the action of the through hole 12 of the base 1, the first claw 2 and the second claw 3 are driven to move toward each other synchronously, thereby applying a balanced clamping force from both ends of the rib; and the support columns 8 at both ends of the base 1 are in contact with both sides of the inner arc surface of the shoe plate to support both sides of the shoe plate, thereby realizing the clamping and fixation of the brake shoe, which is convenient for the processing of the outer arc surface and both side edges of the brake shoe plate.

[0036] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit the scope of protection of the present invention. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the present invention may be modified or replaced by equivalents without departing from the essence and scope of the technical solutions of the present invention.

Claims

1. A clamping device for machining the shoe surface of a brake shoe, characterized in that: The invention comprises a base (1), wherein a cavity (11) is provided inside the base, a through hole (12) is provided on the side wall of the base (1), and a first clamping claw (2) and a second clamping claw (3) are provided outside the base (1), and a connecting block (4) and a driving mechanism are provided inside the cavity (11). One end of the first clamping claw (2) and the second clamping claw (3) passes through the through hole (12) and is rotatably connected to the connecting block (4). When the driving mechanism drives the connecting block (4) to move radially along the base (1), the connecting block (4) drives the first clamping claw (2) and the second clamping claw (3) to move toward or in opposite directions along the axial direction of the base (1). A first positioning column (5) and a cushion block (6) are provided at one end of the base (1), and the cushion block (6) and the first positioning column (5) are respectively located at the two ends of the first clamping claw (2) and the second clamping claw (3).

2. A clamping device for machining the brake shoe surface according to claim 1, characterized in that: A telescopic spring (7) is provided between the first clamping claw (2) and the second clamping claw (3), and the axial direction of the telescopic spring (7) is consistent with the axial direction of the base (1).

3. The clamping device for machining the brake shoe surface according to claim 2, characterized in that: The first clamping claw (2) and the second clamping claw (3) are respectively provided with a deep groove for accommodating the telescopic spring (7).

4. The clamping device for machining the brake shoe surface according to claim 1, characterized in that: The outer walls of the first clamping claw (2) and the second clamping claw (3) are arc surfaces or inclined surfaces.

5. The clamping device for machining the brake shoe surface according to claim 1, characterized in that: When the first clamping claw (2) and the second clamping claw (3) are in an open state, the maximum distance between the outer walls of the first clamping claw (2) and the second clamping claw (3) is greater than the length of the through hole (12).

6. The clamping device for machining the brake shoe surface according to claim 1, characterized in that: Support columns (8) are provided at both ends of the base (1), the support columns (8) are connected to the threads, and the axes of the support columns (8) are perpendicular to the axis of the base (1).

7. The clamping device for machining the brake shoe surface according to claim 1, characterized in that: The first positioning column (5) and the cushion block (6) are respectively connected to the base (1) through an adjustment plate (9); the base (1) and the adjustment plate (9) are correspondingly provided with a plurality of groups of connection holes; the adjustment plate (9) is connected to the base (1) through bolts.

8. The clamping device for machining the brake shoe surface according to claim 1, characterized in that: A guide unit (10) is provided inside the cavity (11).

9. The clamping device for machining the brake shoe surface according to claim 1, characterized in that: In the circumferential direction of the base (1), the base (1) is provided with two groups of the first clamping claws (2), the second clamping claws (3), the connecting holes, the first positioning columns (5) and the pads (6).

10. The clamping device for machining the brake shoe surface according to claim 9, characterized in that: The driving mechanism drives the two groups of connecting blocks (4) to move synchronously in the same direction or in opposite directions.

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