Machine tool cutter holder capable of automatically centering

Abstract

The machine tool cutter holder capable of achieving automatic centering comprises a cutter holder base, a left pressing arm, a right pressing arm, a compression spring and a centering assembly, the left pressing arm and the right pressing arm are oppositely arranged on the upper end face of the cutter holder base, and the left pressing arm and the right pressing arm are installed on the cutter holder base in a hinged mode through arranged pin shafts; by the adoption of the machine tool cutter holder structure, when the left pressing arm and the right pressing arm clamp a cutter, the cutter enters the clamping space defined by the clamping ends of the left pressing arm and the right pressing arm, and the outer surface of the cutter makes contact with buttons and rollers in the centering assemblies on the left pressing arm and the right pressing arm; due to the fact that the pair of pin rollers on the clamping end on each side are symmetrically arranged, the outer surface of the cutter makes rolling contact with the outer surfaces of the pin rollers in the process that the cutter makes contact with the pin rollers, and therefore the cutter which is originally in an inclined state can be automatically in a vertical state under the action of the rolling contact between the cutter and the pin rollers and the gravity of the cutter. And the problem of subsequent manual intervention is avoided.

Description

Technical Field

[0001] The present invention relates to the technical field of robot processing equipment, and in particular to a machine tool tool holder capable of automatic centering. Background Art

[0002] As an important accessory of machine tool processing tools, machine tool tool holders play an important role in tool processing performance. Machine tool tool holders are used in the tool magazine of CNC machining centers to clamp the tool handle. During the part processing process, the spindle will put the tool into the tool magazine or take it out of the tool magazine according to the needs.

[0003] However, during the process of picking up and placing the tool, the tool holder may sometimes tilt due to unexpected factors (the original placement position of the tool is tilted or it is tilted due to external vibration), making it difficult for the tool holder to pick up and place the tool in the subsequent picking up and placing operations, requiring manual intervention to adjust the tool. Summary of the invention

[0004] In view of the defects existing in the prior art, the purpose of the present invention is to provide a machine tool tool holder that can be automatically centered to solve the problem that the existing machine tool tool holder has the problem that the tool itself is tilted when storing the tool, resulting in the need for manual adjustment of the tool when it is subsequently used.

[0005] To achieve the above purpose, the technical solution adopted by the present invention is as follows: The present application provides a machine tool tool clamp which can be automatically centered, the machine tool tool clamp comprising a tool clamp base, the machine tool tool clamp also comprising a left pressure arm, a right pressure arm, a compression spring and a centering component, the left pressure arm and the right pressure arm are arranged opposite to each other on the upper end surface of the tool clamp base, the left pressure arm and the right pressure arm are respectively hingedly mounted on the tool clamp base through a pin shaft, the clamping ends of the left pressure arm and the right pressure arm can approach or move away from each other, the compression spring is compressed and mounted between the other ends of the left pressure arm and the right pressure arm opposite to the clamping end, the clamping ends of the left pressure arm and the right pressure arm are respectively mounted with the centering components, the centering components comprise a pair of rollers, a button, a motor, a connecting plate and a reset compression spring, the button is mounted on the outer side surface of the clamping end, One end is hinged to the outer side surface of the clamping end, the motor is arranged in a groove provided at the clamping end, the motor is connected to one side of the connecting plate, and is used to drive the connecting plate to move back and forth, one end of the reset compression spring is connected to the other side of the connecting plate, and the other end of the reset compression spring is fixedly installed in the groove of the clamping end, the roller is arranged at the outer edge of the groove, a pair of the rollers are symmetrically arranged on opposite sides of the button, the rollers are fixedly connected to the connecting plate through a connecting rod, and the rollers form a retractable sliding connection with the inner cavity of the groove, wherein when the button is pressed, one end of the button presses into the groove and triggers the action of the motor, driving the connecting plate to drive the ball to shrink and move toward the inner cavity of the groove.

[0006] Furthermore, a roller is installed at the front end of the clamping end.

[0007] Furthermore, the outer shape of the clamping end is a concave arc outer shape structure.

[0008] Furthermore, the inner side surface of the button is fixedly connected to one end of a push rod, and the other end of the push rod is used to cooperate with the switch button of the motor to control whether the switch button is actuated.

[0009] Furthermore, the button is arranged at a middle position of the outer edge of the clamping end, and both ends of the roller are rotationally connected to the connecting rod.

[0010] Furthermore, an automatic locking device for controlling the clamping and loosening between the left and right pressure arms is provided between the left and right pressure arms, and the automatic locking device is installed between the other ends of the left and right pressure arms opposite to the clamping end.

[0011] Furthermore, a positioning block is provided between the left pressure arm and the right pressure arm, and the positioning block is fixedly mounted on the upper end surface of the tool holder base near the outer edge of the clamping end.

[0012] Furthermore, the automatic locking device includes a pressure block, a trigger member, a trigger compression spring and a base, the base is arranged at the outer edge of the other end of the clamping end at the bottom end of the upper end surface of the tool clamp base, the bottom end of the trigger member is mounted on the base through the trigger compression spring, the pressure block is fixedly mounted on the top end of the trigger member, the trigger compression spring includes a first position and a second position, when the trigger compression spring is in the first position, the outer edge of the trigger member is respectively squeezed and contacted with the inner side surface at the other end of the left pressure arm and the right pressure arm, so that the clamping end openings of the left pressure arm and the right pressure arm are reduced; when the trigger compression spring is in the second position, the trigger member moves downward and disengages from the inner side surface at the other end of the left pressure arm and the right pressure arm, and the clamping end openings of the left pressure arm and the right pressure arm are expanded.

[0013] Furthermore, the trigger member includes a cylindrical trigger portion and a connecting portion, the connecting portion extends upward from the top end of the trigger portion, the bottom end of the trigger portion is connected to the base through the trigger compression spring, the pressure block is fixedly mounted on the connecting portion, the outer diameter of the trigger portion is larger than the outer diameter of the connecting portion, and when the trigger compression spring is in the first position, the outer edge of the trigger portion is respectively squeezed and contacted with the inner side surfaces at the other ends of the left pressure arm and the right pressure arm, so that the clamping end openings of the left pressure arm and the right pressure arm are reduced; when the trigger compression spring is in the second position, the trigger portion moves downward and disengages from the inner side surfaces at the other ends of the left pressure arm and the right pressure arm, and the clamping end openings of the left pressure arm and the right pressure arm are expanded.

[0014] The beneficial effects of the present invention are: By adopting the above-mentioned machine tool tool clamping structure, when the left pressure arm and the right pressure arm clamp the tool, the tool enters the clamping space surrounded by the clamping ends in the left pressure arm and the right pressure arm, and the outer surface of the tool contacts the button and the roller in the centering assembly on the left pressure arm and the right pressure arm. Since a pair of rollers on the clamping ends on each side are symmetrically arranged, the outer surface of the tool forms a rolling contact with the outer surface of the roller during the contact between the tool and the roller. Therefore, under the rolling contact with the roller and the action of its own gravity, the tool that was originally in an inclined state will automatically be in an upright state, avoiding the problem of subsequent manual intervention; at the same time, during the contact between the tool and the roller, the tool will also form an inward squeezing force on the button. As the button is pressed down, the button will trigger the motor to move, so that the connecting plate drives the roller to move inward, and then the outer edges of the clamping ends of the left pressure arm and the right pressure arm complete the contact with the outer surface of the tool, ensuring the normal clamping function of the tool. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a schematic diagram of the three-dimensional structure of the automatically alignable machine tool tool holder in the embodiment of the present application.

[0016] Figure 2 It is a schematic diagram of the structure of the automatically alignable machine tool tool holder in the embodiment of the present application, viewed from above.

[0017] Figure 3 It is a schematic diagram of the structural principle that the centering assembly in an embodiment of the present application is installed on the left pressure arm and the right pressure arm.

[0018] Figure 4 for Figure 1 Schematic diagram of the local enlarged structure at A in the figure.

[0019] Figure 5 It is a schematic diagram of the structure of a machine tool tool holder that can automatically center itself to clamp a tool in an embodiment of the present application.

[0020] Figure 6 This is a structural schematic diagram of the automatic locking device in an embodiment of the present application installed between the left pressing arm and the right pressing arm.

[0021] In the figure: 10-machine tool clamp, 100-left pressure arm, 200-right pressure arm, 300-tool clamp base, 400-compression spring, 500-automatic locking device, 501-pressure block, 502-trigger, 5021-connecting part, 5022-trigger part, 503-base, 600-positioning block, 700-roller, 800-centering assembly, 801-roller, 802-button, 803-motor, 804-connecting plate, 805-reset compression spring, 806-push rod, 807-groove. DETAILED DESCRIPTION

[0022] The present invention will be further described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0023] See attached Figure 1 To Attachment Figure 5 As shown, this embodiment provides a machine tool tool holder 10 that can be automatically centered, which includes a tool holder base 300, a left pressure arm 100, a right pressure arm 200, a compression spring 400 and a centering assembly 800.

[0024] See attached Figure 1 and attached Figure 2 As shown, the left pressure arm 100 and the right pressure arm 200 are installed on the upper end surface of the tool holder base 300, and the two are arranged symmetrically. The left pressure arm 100 and the right pressure arm 200 each include two opposite ends, one end is used to contact the outer surface of the tool, which is the clamping end; the other end is an end that extends freely, which is the free end. The clamping ends of the left pressure arm 100 and the right pressure arm 200 extend outward from one side of the tool holder base 300, and the free end is located on the upper end surface of the tool holder base 300.

[0025] The portion of the left pressure arm 100 near the clamping end is hingedly mounted on the upper end surface of the tool holder base 300 through a pin shaft, so that the left pressure arm 100 can rotate horizontally relative to the tool holder base 300. Similarly, the portion of the right pressure arm 200 near the clamping end is also hingedly mounted on the upper end surface of the tool holder base 300 through a pin shaft, so that the right pressure arm 200 can rotate horizontally relative to the tool holder base 300.

[0026] See attached Figure 1 As shown, in order to enable the left pressure arm 100 and the right pressure arm 200 to have a clamping force on the tool, a compression spring 400 is installed between the left pressure arm 100 and the right pressure arm 200. In this embodiment, the compression spring 400 is installed between the left pressure arm 100 and the right pressure arm 200 at a position close to the free end, one end of the compression spring 400 is connected to the left pressure arm 100, and the other end is connected to the right pressure arm 200. And the number of compression springs 400 can be flexibly set according to needs.

[0027] In this way, when the left pressure arm 100 and the right pressure arm 200 are clamping the tool, the tool will force the left pressure arm 100 and the right pressure arm 200 to move away from each other. At this time, the tool forms an outward squeezing force on the left pressure arm 100 and the right pressure arm 200 respectively, causing the clamping ends of the left pressure arm 100 and the right pressure arm 200 to rotate outward, while the free ends of the left pressure arm 100 and the right pressure arm 200 will move closer to each other and squeeze the compression spring 400. The compression spring 400 in a compressed state will form an opposite force on the left pressure arm 100 and the right pressure arm 200, prompting the clamping ends of the left pressure arm 100 and the right pressure arm 200 to form a clamping force on the tool toward the center.

[0028] See attached Figure 1 , Attachment Figure 3 And attached Figure 6As shown, an automatic locking device 500 is also provided at the free end position of the left pressing arm 100 and the right pressing arm 200, and the automatic locking device 500 is used to control the clamping and loosening between the left pressing arm 100 and the right pressing arm 200. Specifically, in this embodiment, the automatic locking device 500 includes a pressing block 501, a trigger member 502, a trigger compression spring (not shown in the figure) and a base 503. The base 503 is arranged at the outer edge of the clamping end near the bottom end of the upper end surface of the tool clamp base 300, the bottom end of the trigger member 502 is mounted on the base 503 through the trigger compression spring, the pressing block 501 is fixedly mounted on the top of the trigger member 502, and the trigger compression spring includes a first position and a second position, the first position is a compressed state in which no external force acts on the pressing block 501, and the trigger compression spring is in the original position; the second position is a compressed state in which the trigger compression spring is compressed and in the compressed position after the robot presses the pressing block 501 downward. When the compression spring is in the first position, the outer edge of the trigger member 502 is in compression contact with the inner arc inclined surfaces at the free ends of the left pressure arm 100 and the right pressure arm 200, respectively, and a horizontal outward thrust is applied to the left pressure arm 100 and the right pressure arm 200, respectively, so that the compression spring between the left pressure arm 100 and the right pressure arm 200 is in an outwardly extended state. At this time, the openings at the free ends of the left pressure arm 100 and the right pressure arm 200 are enlarged, and at the same time, the openings at the clamping ends of the left pressure arm 100 and the right pressure arm 200 are reduced, thereby achieving clamping of the tool handle; when the compression spring is triggered When in the second position, the trigger member 502 moves downward and disengages from the arc-shaped oblique inner side surfaces at the free ends of the left pressure arm 100 and the right pressure arm 200. When the free ends of the left pressure arm 100 and the right pressure arm 200 lose the outward edge squeezing force applied by the trigger member 502, the compression spring 400 between the left pressure arm 100 and the right pressure arm 200 returns to its original state, thereby reducing the openings at the free ends of the left pressure arm 100 and the right pressure arm 200 and expanding the openings at the clamping ends of the left pressure arm 100 and the right pressure arm 200, thereby achieving the loosening of the tool handle.

[0029] Please refer to the attached Figure 6As shown, in this embodiment, the trigger member 502 includes a cylindrical trigger portion 5022 and a connecting portion 5021, the connecting portion 5021 extends upward from the top end of the trigger portion 5022, the bottom end of the trigger portion 5022 is connected to the base 503 through a trigger compression spring, and the pressure block 501 is fixedly mounted on the connecting portion 5021. The outer diameter of the trigger portion 5022 is larger than the outer diameter of the connecting portion 5021. In this way, when the reset compression spring is in the first position, the outer surface of the trigger portion 5022 with a larger outer diameter is pressed and contacted with the inner arc inclined surface at the free end 900 of the left pressure arm 100 and the right pressure arm 200. A horizontal outward force is applied to the left pressure arm 100 and the right pressure arm 200; and when the reset compression spring is in the second position, since the reset compression spring is in a downwardly compressed state at this time, the trigger portion 5022 will move downward with the reset compression spring, and the trigger portion 5022 will disengage from the contact with the inner arc inclined surface at the free ends of the left pressure arm 100 and the right pressure arm 200. At the same time, the connecting portion 5021 also synchronously moves downward with the trigger portion 5022. Since the outer diameter of the connecting portion 5021 is relatively small, the connecting portion 5021 will not squeeze the inner arc inclined surface at the free ends of the left pressure arm 100 and the right pressure arm 200.

[0030] That is, when the compression spring is triggered in the first position, the outer edge of the trigger portion 5022 is in compression contact with the inner arc inclined surface at the free end 900 of the left pressure arm 100 and the right pressure arm 200, respectively, and a horizontal outward thrust is applied to the left pressure arm 100 and the right pressure arm 200, respectively, so that the compression spring between the left pressure arm 100 and the right pressure arm 200 is in an outwardly extended state. At this time, the openings at the free ends of the left pressure arm 100 and the right pressure arm 200 are enlarged, and at the same time, the openings at the clamping ends of the left pressure arm 100 and the right pressure arm 200 are reduced, thereby achieving the clamping of the tool handle; when the compression spring is triggered, the outer edge of the trigger portion 5022 is in compression contact with the inner arc inclined surface at the free ends 900 of the left pressure arm 100 and the right pressure arm 200, respectively, and a horizontal outward thrust is applied to the left pressure arm 100 and the right pressure arm 200, respectively, so that the compression spring between the left pressure arm 100 and the right pressure arm 200 is in an outwardly extended state. At this time, the openings at the free ends of the left pressure arm 100 and the right pressure arm 200 are enlarged, and at the same time, the openings at the clamping ends of the left pressure arm 100 and the right pressure arm 200 are reduced, thereby achieving the clamping of the tool handle; When the spring is in the second position, the trigger portion 5022 moves downward and disengages from the arc-shaped oblique inner surface at the free ends of the left pressure arm 100 and the right pressure arm 200. When the free ends of the left pressure arm 100 and the right pressure arm 200 lose the outward edge squeezing force applied by the trigger member 502, the compression spring 400 between the left pressure arm 100 and the right pressure arm 200 returns to its original state, so that the openings at the free ends of the left pressure arm 100 and the right pressure arm 200 are reduced, and at the same time, the openings at the clamping ends of the left pressure arm 100 and the right pressure arm 200 are expanded, thereby achieving the loosening of the tool handle.

[0031] See attached Figure 1 , Attachment Figure 2 And attached Figure 4 As shown, in order to automatically center the tool that is originally in a tilted state during the clamping process, a centering component 800 is respectively provided at the clamping end of the left pressure arm 100 and the right pressure arm 200, and the centering component 800 is used to correct the state of the tool.

[0032] Specifically, the centering component 800 includes a pair of rollers 801, a button 802, a motor 803, a connecting plate 804 and a reset compression spring 805. The button 802 is installed on the outer side surface of the clamping end, and one end of the button 802 is hinged to the outer side surface of the clamping end. The connecting plate 804 and the motor 803 are both arranged in a groove 807 provided at the clamping end. The motor 803 is connected to one side of the connecting plate 804 for driving the connecting plate 804 to move back and forth. One end of the return compression spring 805 is connected to the other side of the connecting plate 804, and the other end of the return compression spring 805 is fixedly installed in the clamping end groove 807. The roller 801 is arranged at the outer edge of the groove 807. A pair of rollers 801 are symmetrically arranged on opposite sides of the button 802. The roller 801 is fixedly connected to the connecting plate 804 through a connecting rod, and the roller 801 forms a retractable sliding connection with the inner cavity of the groove 807. When the button 802 is pressed, one end of the button 802 presses into the groove 807 and triggers the motor 803 to move, driving the connecting plate 804 to drive the ball to shrink and move toward the inner cavity of the groove 807. For example, the inner side surface of the button 802 is fixedly connected to one end of the push rod 806, and the other end of the push rod 806 is used to cooperate with the switch button 802 of the motor 803 to control whether the switch button 802 is activated or not. In this way, when the button 802 is subjected to an outward squeezing force, one end of the button 802 moves outward, and the end of the button 802 in the moving state then synchronously drives the push rod 806 to move, so that the push exerts pressure on the switch button 802 on the motor 803, and the motor 803 then moves, pushing the connecting plate 804 to move accordingly.

[0033] In some embodiments, the button 802 is arranged at the middle position of the outer edge of the clamping end, the two ends of the roller 801 are rotatably connected with the connecting rod, and the outer shape of the clamping end is an inwardly concave arc outer shape structure. By arranging the button 802 at the middle position of the clamping end, a pair of rollers 801 are symmetrically arranged on both sides of the button 802. This structure allows the tool to enter the clamping end, and the four rollers 801 arranged diagonally between the clamping ends on both sides can contact the tool located at the center in the form of a diagonal line. In this way, during the process of contact and extrusion between the tool and the roller 801, the roller 801 will apply a force to the tool in the center direction, and under the action of the tool's own gravity, the tool will gradually be in an upright state, realizing the automatic centering function of the tool.

[0034] See attached Figure 1 To Attachment Figure 3 As shown, in order to ensure that the left pressure arm 100 and the right pressure arm 200 are in the correct installation position on the tool clamp base 300, a positioning block 600 is also provided between the left pressure arm 100 and the right pressure arm 200. The positioning block 600 is fixedly installed on the upper end surface of the tool clamp base 300 near the outer edge of the clamping end.

[0035] In addition, in order to facilitate the tool to smoothly enter the clamping space surrounded by the left pressure arm 100 and the right pressure arm 200, a roller 700 is also installed at the front end of the clamping end. The roller 700 can rotate horizontally relative to the clamping end. In this way, when the tool enters the clamping space surrounded by the left pressure arm 100 and the right pressure arm 200, the outer surface of the tool contacts the roller 700, and the tool can smoothly enter the above-mentioned clamping space.

[0036] In some embodiments, the automatically alignable machine tool tool holder 10 is made of aluminum alloy and is formed in one step in a mold through a die-casting process. The part has high dimensional accuracy, and when the parts are subsequently assembled, fewer positions need to be processed, the processing time is relatively short, the cost is low, and the economic benefits are more obvious.

[0037] Obviously, those skilled in the art can make various changes and modifications to the present invention without departing from the spirit and scope of the present invention. Thus, if these modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include these modifications and variations.

Claims

1. A machine tool tool holder capable of automatic centering, the machine tool tool holder comprising a tool holder base, characterized in that: The machine tool tool clamp also includes a left pressure arm, a right pressure arm, a compression spring and a centering component, the left pressure arm and the right pressure arm are relatively arranged on the upper end surface of the tool clamp base, the left pressure arm and the right pressure arm are respectively hingedly installed on the tool clamp base through a pin shaft, the clamping ends of the left pressure arm and the right pressure arm can approach or move away from each other, the compression spring is compressed and installed between the other ends of the left pressure arm and the right pressure arm opposite to the clamping end, and the centering components are respectively installed at the clamping ends of the left pressure arm and the right pressure arm, and the centering components include a pair of rollers, a button, a motor, a connecting plate and a reset compression spring, the button is installed on the outer side surface of the clamping end, one end of the button is hinged to the outer side surface of the clamping end, The motor is arranged in a groove provided at the clamping end, and the motor is connected to one side of the connecting plate to drive the connecting plate to move back and forth. One end of the reset compression spring is connected to the other side of the connecting plate, and the other end of the reset compression spring is fixedly installed in the groove of the clamping end. The roller is arranged at the outer edge of the groove, and a pair of the rollers are symmetrically arranged on opposite sides of the button. The rollers are fixedly connected to the connecting plate through a connecting rod, and the rollers form a retractable sliding connection with the inner cavity of the groove, wherein when the button is pressed, one end of the button presses into the groove and triggers the action of the motor, driving the connecting plate to drive the ball to shrink and move toward the inner cavity of the groove.

2. The automatically alignable machine tool tool holder according to claim 1, characterized in that: A roller is also installed at the front end of the clamping end.

3. The automatically alignable machine tool tool holder according to claim 1 or 2, characterized in that: The outer shape of the clamping end is a concave arc outer shape structure.

4. The automatically alignable machine tool tool holder according to claim 1, characterized in that: The inner side surface of the button is fixedly connected to one end of a push rod, and the other end of the push rod is used to cooperate with the switch button of the motor to control whether the switch button is actuated or not.

5. The automatically alignable machine tool tool holder according to claim 1, characterized in that: The button is arranged at the middle position of the outer edge of the clamping end, and the two ends of the roller are rotatably connected with the connecting rod.

6. The automatically alignable machine tool tool holder according to claim 1, characterized in that: An automatic locking device for controlling the clamping and loosening between the left and right pressure arms is also provided between the left and right pressure arms, and the automatic locking device is installed between the other ends of the left and right pressure arms opposite to the clamping end.

7. The automatically alignable machine tool tool holder according to claim 1 or 6, characterized in that: A positioning block is also arranged between the left pressure arm and the right pressure arm. The positioning block is fixedly mounted on the upper end surface of the tool holder base near the outer edge of the clamping end.

8. The automatically alignable machine tool tool holder according to claim 6, characterized in that: The automatic locking device includes a pressure block, a trigger member, a trigger compression spring and a base, wherein the base is arranged at the outer edge of the other end of the clamping end at the bottom end of the upper end surface of the tool clamp base, the bottom end of the trigger member is mounted on the base through the trigger compression spring, and the pressure block is fixedly mounted on the top end of the trigger member. The trigger compression spring includes a first position and a second position. When the trigger compression spring is in the first position, the outer edge of the trigger member is respectively squeezed and contacted with the inner side surface at the other end of the left pressure arm and the right pressure arm, so that the clamping end openings of the left pressure arm and the right pressure arm are reduced; when the trigger compression spring is in the second position, the trigger member moves downward and disengages from the inner side surface at the other end of the left pressure arm and the right pressure arm, and the clamping end openings of the left pressure arm and the right pressure arm are expanded.

9. The automatically alignable machine tool tool holder according to claim 8, characterized in that: The trigger member includes a cylindrical trigger portion and a connecting portion, the connecting portion extends upward from the top end of the trigger portion, the bottom end of the trigger portion is connected to the base through the trigger compression spring, the pressure block is fixedly mounted on the connecting portion, the outer diameter of the trigger portion is larger than the outer diameter of the connecting portion, when the trigger compression spring is in the first position, the outer edge of the trigger portion is respectively pressed and contacted with the inner side surface at the other end of the left pressure arm and the right pressure arm, so that the clamping end openings of the left pressure arm and the right pressure arm are reduced; when the trigger compression spring is in the second position, the trigger portion moves downward and disengages from the inner side surface at the other end of the left pressure arm and the right pressure arm, and the clamping end openings of the left pressure arm and the right pressure arm are expanded.

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