A cam-pressing mechanism

Abstract

A cam-driven edge-pressing mechanism includes a fixed bracket, a cam shaft, a fixed shaft, an edge-pressing arm, a shift fork, a roller, a cam, and a spring support assembly. The cam shaft is rotatably supported at both ends by the fixed bracket, and the fixed shaft is fixedly supported at both ends by the fixed bracket and is located above the cam shaft. The edge-pressing arm is mounted on the fixed shaft and can rotate around it. One end of the arm is equipped with a shift fork, and the other end is equipped with a roller via a roller bracket. The roller is rotatably supported by a roller shaft, which is fixedly mounted on the roller bracket, which is mounted on the edge-pressing arm. The cam is mounted on the cam shaft and rotates with it. The cam corresponds to and is always in contact with the roller. The rotation of the cam causes the roller to drive the edge-pressing arm to swing in a lever arc, thereby causing the shift fork to drive the edge-pressing ring assembly to move up and down linearly to loosen or tighten the stretched product. This cam-driven edge-pressing mechanism has a compact structure, facilitating production and installation.

Description

Technical Field

[0001] This utility model relates to a pressing cam adjustment mechanism for a stretching machine. Background Technology

[0002] The edge pressing mechanism is a mechanical device widely used in metal sheet processing, stretch forming and other fields. Its main function is to control the deformation of the material edge by applying pressure, to prevent wrinkles or warping of the sheet edge due to uneven force, and to ensure processing accuracy and product quality.

[0003] The existing blank-pressing mechanism is installed in two parts. One part, including the blank-pressing arm, shift fork, and cam, is installed on the upper die. The shift fork is connected to the blank-pressing ring assembly. When the blank-pressing arm swings, it drives the blank-pressing ring assembly to move up and down to loosen or press the stretched product. The other part, the spring support mechanism, is installed on the lower die. This separate installation is not conducive to modular production. Moreover, the existing mechanism is very large in size and occupies a lot of space. The spring of the spring support mechanism is located at the end of the blank-pressing arm, so the blank-pressing arm is in a cantilever state. In addition, the spring does not have a guide rod or other support guide. When the blank-pressing arm swings, the spring is easy to bend. Over time, the spring will not be able to provide good support for the blank-pressing arm and may even affect the blank-pressing accuracy. Summary of the Invention

[0004] The technical problem to be solved by this utility model is to overcome the above-mentioned defects of the prior art and provide a cam pressing mechanism with a compact structure and convenient installation.

[0005] The technical solution adopted by this utility model to solve the above-mentioned technical problems is as follows:

[0006] A cam-driven edge-pressing mechanism includes a fixed bracket, a cam shaft, a fixed shaft, an edge-pressing arm, a shift fork, a roller, a cam, and a spring support assembly. The cam shaft is rotatably supported at both ends by the fixed bracket, and the fixed shaft is fixedly supported at both ends by the fixed bracket and is located above the cam shaft. The edge-pressing arm is mounted on the fixed shaft and can rotate around it. One end of the arm is equipped with a shift fork, and the other end is equipped with a roller via a roller bracket. The roller is rotatably supported by a roller shaft, which is fixedly mounted on the roller bracket, which is mounted on the edge-pressing arm. The cam is mounted on the cam shaft and rotates with it. The cam corresponds to and is always in contact with the roller. The rotation of the cam causes the roller to drive the edge-pressing arm to swing in a lever arc, thereby causing the shift fork to drive the edge-pressing ring assembly to move vertically up and down, thus loosening or pressing the stretched product.

[0007] Better yet, the cams are multiple according to the requirements of the stretching station, and each cam has a different shape to meet the requirements of varying stretching heights at different stations.

[0008] Even better, a spring support assembly is also provided, which includes an upper sleeve, a lower sleeve, and a spring. The upper and lower sleeves are concentric, with one end of the lower sleeve located inside or outside the upper sleeve. The spring is located inside the upper and lower sleeves, with its upper end contacting the inner end face of the upper sleeve and its lower end contacting the inner end face of the lower sleeve. The upper end of the upper sleeve is hinged to the pressure arm, and the lower end of the lower sleeve is hinged to a fixed seat. The fixed seat can be integrated with a fixed bracket or installed on a lower mold or base. The spring support assembly can support the pressure arm as it moves, and the spring will swing and extend as the pressure arm swings, thus providing support.

[0009] Even better, the upper end of the upper sleeve is located in the middle of the total length between the pressure arm and the shift fork, which provides better support and improves the pressing accuracy.

[0010] Better yet, the upper or lower sleeve is provided with a guide post that is integral with and concentric with the upper or lower sleeve, and the spring is sleeved on the guide post. The guide post can guide the spring to extend and retract linearly and prevent it from bending arbitrarily.

[0011] Better still, the upper sleeve is connected to the pressure arm by a bolt. The bolt is threaded onto the upper sleeve, with one end screwed into the upper sleeve and the other end hinged to the pressure arm. Rotating the upper sleeve or the bolt adjusts its initial position, thereby adjusting the spring deformation.

[0012] Better still, the lower sleeve may be connected to the fixed seat by another bolt, which is threaded onto the lower sleeve. One end of the other bolt is screwed into the lower sleeve, and the other end is hinged to the fixed seat. Rotating the lower sleeve or the other bolt can adjust its initial position, thereby adjusting the spring deformation.

[0013] Even better, a pressure arm adjustment mechanism is also provided, which includes an adjustment bolt. The adjustment bolt is installed at the end of the pressure arm or on the pressure arm via an adjustment plate. The adjustment bolt is threadedly connected to the roller bracket. By turning the bolt, the roller bracket is moved up and down to change the height position of the roller, thereby adjusting the height position of the pressure ring assembly to adapt to changes in the wall thickness of the stretched product.

[0014] Compared with the prior art, the advantages of this utility model are: the cam pressing mechanism is an integral unit, therefore, its structure is compact and it is conducive to organizing production and installation. Attached Figure Description

[0015] Figure 1 This is a three-dimensional structural diagram of a cam pressing mechanism according to an embodiment of the present invention.

[0016] Figure 2 This is a front structural diagram of a cam pressing mechanism according to an embodiment of the present invention.

[0017] Figure 3 for Figure 2 Cross-sectional view at point AA.

[0018] Figure 4 This is a partial cross-sectional view of a spring support assembly for a cam pressing mechanism according to an embodiment of the present invention.

[0019] Figure 5 This is a side cross-sectional view of a cam pressing mechanism according to another embodiment of the present invention.

[0020] Figure 6 This is a partial cross-sectional view of a spring support assembly for a cam pressing mechanism according to another embodiment of the present invention. Detailed Implementation

[0021] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0022] like Figure 1 , Figure 2 , Figure 3 and Figure 4 As shown, a cam pressing mechanism includes a fixed bracket 1, a cam shaft 2, a fixed shaft 3, a pressing arm 4, a shift fork 5, a roller 6, a cam 7, and a spring support assembly 8.

[0023] The two ends of the cam shaft 2 are rotatably supported by the fixed bracket 1, and the two ends of the fixed shaft 3 are fixedly supported by the fixed bracket 1 and are located above the cam shaft 2.

[0024] The pressing arm 4 is mounted on the fixed shaft 3 and can rotate around the fixed shaft 3. One end of the arm is equipped with a fork 5, and the other end is equipped with a roller 6 via a roller bracket 601. The roller 6 is rotatably supported by a roller shaft 602. The roller shaft 602 is fixedly mounted on the roller bracket 601, and the roller bracket 601 is mounted on the pressing arm 4.

[0025] The cam 7 is mounted on the cam shaft 2 and rotates together with the cam shaft 2. There can be multiple cams 7 according to the requirements of the stretching station. Each cam 7 has a different shape to meet the requirements of different stretching heights at different stations. The cam 7 corresponds one-to-one with the roller 6 and is always in contact with it.

[0026] The spring support assembly 8 includes an upper sleeve 801, a lower sleeve 802, and a spring 803. The upper sleeve 801 and the lower sleeve 802 are concentric. One end of the lower sleeve 802 is located inside the upper sleeve 801. The lower sleeve 802 is provided with a guide post 8022 that is integral with and concentric with it. The upper end of the upper sleeve 801 is hinged to the pressure arm 4 and is basically located in the middle position between the pressure arm 4 and the shift fork 5, so as to provide better support for the pressure arm. The lower end of the lower sleeve 802 is hinged to the fixed seat 804.

[0027] The spring 803 is located inside the upper sleeve 801 and the lower sleeve 802 and is fitted around the guide post 8022. Its upper end contacts the inner end face 8011 of the upper sleeve 801, and its lower end contacts the inner end face 8021 of the lower sleeve 802. The spring swings and extends with the swing of the pressure arm 4, providing support. In addition, since the guide post 8022 is provided inside the lower sleeve 802, the guide post 8022 can guide the linear extension and contraction of the spring 803 and prevent it from bending arbitrarily.

[0028] The spring support assembly 8, pressure arm 4, shift fork 5, cam 7 and roller 6 form a group. In this embodiment, there are 5 groups, which are arranged side by side to complete the pressing action synchronously.

[0029] The entire pressing mechanism described above is a single unit. After assembly, it is connected to the stretch forming equipment. The fixed bracket 1 is installed on the lower die (not shown in the figure) of the stretch forming equipment, or it can be installed on the base (not shown in the figure) on which the lower die is installed. The fixed seat 804 can be integrated with the fixed bracket 1, or it can be installed on the lower die or the base. Therefore, it can facilitate production and has a very compact structure.

[0030] During operation, the cam shaft 2 rotates, which drives the cam 7 to rotate, causing the roller 6 to drive the pressure arm 4 to swing in a lever arc, thereby causing the shift fork 5 to drive the pressure ring assembly to move up and down in a straight line to loosen or tighten the stretched product.

[0031] Since the wall thickness of the stretched product may change, the height position of the pressure ring assembly also needs to be changed. Therefore, a pressure arm adjustment mechanism 9 is also provided. The pressure arm adjustment mechanism 9 includes an adjustment bolt 901, which is installed at the end of the pressure arm 4 or on the pressure arm 4 via an adjustment plate 902. The adjustment bolt 901 is threadedly connected to the roller bracket 601. By turning the bolt 901, the roller bracket 601 is moved up and down to change the height position of the roller 6, thereby adjusting the height position of the pressure ring assembly.

[0032] At this time, the mounting hole connecting the roller bracket 601 and the pressure arm 4 is an oblong hole. When adjusting, you only need to loosen the mounting screw slightly, and the roller bracket 601 will move up or down along the mounting screw. After the position is adjusted, tighten the mounting screw.

[0033] like Figure 5 , 6 As shown, another embodiment of the cam pressing mechanism is shown, which changes the connection relationship between the lower sleeve 802 and the fixed seat 804. The lower sleeve 802 is hinged to the fixed seat 804 by a bolt 805. The bottom of the lower sleeve 802 is provided with a threaded hole 8023. One end of the bolt 805 is screwed into the threaded hole 8023 and enters the lower sleeve 802, while the other end is hinged to the fixed seat 804.

[0034] Since the lower sleeve 802 is threadedly connected to the bolt 805, the lower sleeve 802 or the bolt 805 can be rotated to adjust the initial position of the lower sleeve 802 as needed, thereby adjusting the spring deformation.

[0035] Similarly, the connection between the upper sleeve and the pressure arm can be changed to adjust the spring deformation.

Claims

1. A cam-pressing mechanism, characterized in that: The assembly includes a fixed bracket, a cam shaft, a fixed shaft, a pressing arm, a shift fork, rollers, a cam, and a spring support assembly. The cam shaft is rotatably supported at both ends by the fixed bracket, and the fixed shaft is fixedly supported at both ends by the fixed bracket and is located above the cam shaft. The pressing arm is mounted on the fixed shaft and can rotate around it. One end of the arm is equipped with a shift fork, and the other end is equipped with a roller via a roller bracket. The roller is rotatably supported by a roller shaft, which is fixedly mounted on the roller bracket, which is mounted on the pressing arm. The cam is mounted on the cam shaft and rotates with it. The cam corresponds to and is always in contact with the roller. The rotation of the cam causes the roller to drive the pressing arm in a lever-like arc swing, thereby causing the shift fork to drive the pressing ring assembly in a linear up-and-down motion to loosen or tighten the stretched product.

2. The cam pressing mechanism as described in claim 1, characterized in that: The cam has multiple different shapes.

3. The cam pressing mechanism as described in claim 1, characterized in that: A spring support assembly is also provided, comprising an upper sleeve, a lower sleeve, and a spring. The upper and lower sleeves are concentric, with one end of the lower sleeve located inside or outside the upper sleeve. The spring is located inside the upper and lower sleeves, with its upper end contacting the inner end face of the upper sleeve and its lower end contacting the inner end face of the lower sleeve. The upper end of the upper sleeve is hinged to the pressure arm, and the lower end of the lower sleeve is hinged to a fixed seat. The fixed seat can be integrated with a fixed bracket or installed on a lower mold or base. The spring support assembly can support the pressure arm as it moves, and the spring swings and extends as the pressure arm swings, thus providing support.

4. The cam pressing mechanism as described in claim 3, characterized in that: The upper end of the upper sleeve is located in the middle of the total length between the pressure arm and the shift fork.

5. The cam pressing mechanism as described in claim 3, characterized in that: The upper or lower sleeve is provided with a guide post that is integral with and concentric with it, and the spring is sleeved on the guide post.

6. The cam pressing mechanism as described in claim 3, characterized in that: The upper sleeve is connected to the pressure arm by a bolt. The bolt is threaded onto the upper sleeve, with one end screwed into the upper sleeve and the other end hinged to the pressure arm. Rotating the upper sleeve or the bolt adjusts its initial position, thereby adjusting the spring deformation.

7. The cam pressing mechanism as described in claim 3, characterized in that: The lower sleeve is connected to the fixed seat by another bolt, which is threaded onto the lower sleeve. One end of the other bolt is screwed into the lower sleeve, and the other end is hinged to the fixed seat. Rotating the lower sleeve or the other bolt adjusts its initial position, thereby adjusting the spring deformation.

8. The cam pressing mechanism as described in claim 1, characterized in that: A pressure arm adjustment mechanism is also provided, which includes an adjustment bolt. The adjustment bolt is installed at the end of the pressure arm or on the pressure arm via an adjustment plate. The adjustment bolt is threadedly connected to the roller bracket. By turning the bolt, the roller bracket is moved up and down to change the height position of the roller.

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