Automobile parts stamping device

Abstract

The invention discloses an automobile part stamping device, which relates to the technical field of stamping, and comprises a stamping table, wherein a lower die and a stamping device are arranged on the stamping table, an upper die and an annular seat are arranged on the stamping device, two opposite sides of the annular seat are arranged with a bidirectional rotating mechanism and a demoulding mechanism, and a plurality of brackets are arranged on the stamping table. The invention drives the upper die to stamp the workpiece on the lower die through the stamping device, and drives the demoulding mechanism to press the edge of the workpiece through a motion conversion device when descending, so as to improve the stability of the workpiece before stamping and ensure the quality of stamping. When the stamping device moves upward, the bidirectional rotating mechanism is driven to rotate through the motion conversion device, so as to control the demoulding mechanism to reciprocate up and down to form vibration, so that the workpiece falls off after being vibrated, so that the workpiece can be separated from the upper die in time, and the problem that the workpiece rises synchronously with the upper die and affects the subsequent stamping process is avoided, and the processing efficiency is improved.

Description

Technical Field

[0001] The invention relates to the technical field of stamping, and in particular to a stamping device for automobile parts. Background Art

[0002] A car is assembled from a large number of different parts. When manufacturing some car parts, they need to go through a stamping process to be stamped. For example, car doors need to be stamped using corresponding stamping equipment.

[0003] In automobile manufacturing, stamping of steel plates can quickly obtain the required formed products. However, since stamping is used for processing, the connection between the steel plate and the mold is relatively tight after stamping. The upper mold may lift the formed steel plate and move it upward. The temperature of the steel plate is high after stamping, which makes it inconvenient to quickly separate the steel plate and the mold, affecting the processing efficiency. In the process of taking out the steel plate, it is easy to fall from a high place due to unstable clamping, causing injuries to surrounding operators and deformation of the product, affecting production quality. Summary of the invention

[0004] The purpose of the present invention is to provide an automobile parts stamping device, which solves the problem that the existing stamping device has a tight connection between the steel plate and the mold when stamping automobile parts, resulting in a decrease in processing efficiency and affecting both production quality and personnel safety.

[0005] In order to solve the above technical problems, the present invention specifically provides the following technical solutions:

[0006] An automobile parts stamping device comprises a stamping table, a lower die and a stamping device are arranged on the stamping table, an upper die for closing with the lower die and an annular seat located on the circumference of the upper die are arranged on the stamping device, two opposite sides of the annular seat are arranged with a bidirectional rotation mechanism and a demoulding mechanism, a plurality of brackets corresponding to the bidirectional rotation mechanism are arranged on the stamping table, and each of the brackets and the outer wall of the annular seat are jointly provided with a motion conversion device;

[0007] Among them, the height of the bottom of the demoulding mechanism is greater than the height of the upper mold when the stamping device stops working, and the motion conversion device is used to transmit the lifting and lowering motion of the stamping device to the bidirectional rotation mechanism, and control the bidirectional rotation mechanism to rotate in two opposite directions during the lifting and lowering process. The bidirectional rotation mechanism drives the demoulding mechanism to reciprocate up and down to generate vibration when the stamping device rises. The bidirectional rotation mechanism drives the demoulding mechanism to press down the edge of the workpiece before the stamping device contacts the workpiece, and squeezes the demoulding mechanism to undergo elastic deformation.

[0008] As a preferred solution of the present invention, the motion conversion device includes a rack arranged on the bracket in the vertical direction and a gear rotatably connected to the annular seat, and the rack is meshed with the gear, the gear is fixedly connected to a first bevel gear through a rotating shaft, the first bevel gear is meshed with a second bevel gear, and the second bevel gear is connected to the outer wall of the annular seat through a connecting shaft, and the bidirectional rotation mechanism is connected to the connecting shaft.

[0009] As a preferred solution of the present invention, the bidirectional rotation mechanism comprises a rotating disk fixedly connected to the connecting shaft, a plurality of elastic levers are evenly arranged on the circumference of the rotating disk, an elastic connecting member is arranged on the outer wall of the annular seat, and a one-way bending component is connected to the elastic connecting member;

[0010] When the turntable rotates in one direction, the one-way bending component transmits vibration to the demolding mechanism by contacting with multiple elastic levers in sequence, and when the turntable rotates in the other direction, the one-way bending component contacts with multiple elastic levers in sequence to squeeze the demolding mechanism downward to move downward.

[0011] As a preferred solution of the present invention, the elastic connecting member includes a sliding seat slidably connected to the annular seat, one side of the sliding seat is connected to a first spring connected to the annular seat, a sliding groove is provided on the annular seat, and the sliding seat is slidably connected in the sliding groove and slides in a vertical direction, and the first spring is arranged in the sliding groove.

[0012] As a preferred solution of the present invention, the one-way bending assembly includes a force-bearing plate fixedly connected to a sliding seat, a fixed plate and a movable plate are provided at the end of the force-bearing plate, and the fixed plate is fixedly connected to the end of the force-bearing plate, the movable plate is rotationally connected to the end of the force-bearing plate through a torsion spring, and when the movable plate is not in contact with the elastic lever, the movable plate is resisted against the fixed plate by the elastic force of the torsion spring.

[0013] As a preferred solution of the present invention, a slope is provided on one side of the movable plate facing the fixed plate, and a plurality of strip-shaped protrusions are provided on the slope at equal intervals.

[0014] As a preferred solution of the present invention, the demoulding mechanism includes a sliding connector slidably connected to the bottom of the force-bearing plate, and the sliding connector can undergo elastic deformation in the vertical direction, and the bottom of the sliding connector is fixedly connected to a pressure plate.

[0015] As a preferred solution of the present invention, the sliding connection includes a second spring arranged at the bottom of the force-bearing plate, a groove is opened at the bottom of the force-bearing plate, a limiting sliding column is slidably connected in the groove, and one end of the second spring is arranged in the groove, the second spring sliding sleeve is arranged outside the limiting sliding column, and the other end of the second spring is against the top of the pressure plate.

[0016] Compared with the prior art, the present invention has the following beneficial effects:

[0017] The present invention drives the upper die to punch the workpiece on the lower die through the punching device, and drives the demoulding mechanism to press the edge of the workpiece through the motion conversion device when the upper die descends, thereby improving the stability of the workpiece during punching and ensuring the quality of punching. When the punching device moves upward, the motion conversion device drives the bidirectional rotation mechanism to rotate, thereby controlling the demoulding mechanism to reciprocate up and down to form vibration, so that the workpiece falls off after being vibrated, and the workpiece can be separated from the upper die in time, avoiding the problem that the workpiece rises synchronously with the upper die and affects the subsequent stamping process, improving the processing efficiency, and avoiding the problem that the workpiece falls from a high place and causes injuries to the operator. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the implementation methods of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for the implementation methods or the description of the prior art. Obviously, the drawings in the following description are only exemplary, and for ordinary technicians in this field, other implementation drawings can be derived from the provided drawings without creative work.

[0019] Figure 1 A structural schematic diagram of an automobile parts stamping device is provided for an embodiment of the present invention;

[0020] Figure 2 A schematic diagram of the three-dimensional structure of a bidirectional rotating mechanism and a demoulding mechanism is provided for an embodiment of the present invention;

[0021] Figure 3 A schematic side structural diagram of a bidirectional rotating mechanism and a demoulding mechanism is provided for an embodiment of the present invention;

[0022] Figure 4 A schematic side cross-sectional view of a bidirectional rotating mechanism and a demoulding mechanism is provided for an embodiment of the present invention;

[0023] Figure 5 A schematic diagram of the structure of a bracket is provided for an embodiment of the present invention;

[0024] Figure 6 Provided for embodiments of the present invention Figure 1 A schematic diagram of the structure enlargement of part A shown in FIG.

[0025] Figure 7 Provided for embodiments of the present invention Figure 2 An enlarged schematic diagram of the structure of part B is shown in FIG.

[0026] The numbers in the figure represent the following:

[0027] 1. Punching table; 2. Lower die; 3. Punching device; 4. Upper die; 5. Ring seat; 6. Bidirectional rotating mechanism; 7. Demolding mechanism; 8. Bracket; 9. Motion conversion device;

[0028] 601, turntable; 602, elastic lever; 603, elastic connector; 604, one-way bending assembly; 605, slide seat; 606, first spring; 607, slide groove; 608, force plate; 609, fixed plate; 610, movable plate; 611, inclined plane; 612, bar-shaped protrusion; 701, sliding connector; 702, pressure plate; 703, second spring; 704, groove; 705, limit slide column; 901, rack; 902, gear; 903, first bevel gear; 904, second bevel gear; 905, connecting shaft. DETAILED DESCRIPTION

[0029] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0030] like Figures 1 to 7 As shown, the present invention provides an automobile part stamping device, including a stamping table 1, on which a lower die 2 and a stamping device 3 are arranged, on which an upper die 4 for closing with the lower die 2 and an annular seat 5 located on the circumference of the upper die 4 are arranged, on which the annular seat 5 is arranged two opposite sides thereof, a bidirectional rotating mechanism 6 and a demolding mechanism 7 are arranged, on the stamping table 1, a plurality of brackets 8 corresponding to the bidirectional rotating mechanism 6 are arranged, and a motion conversion device 9 is jointly arranged on the outer wall of each bracket 8 and the annular seat 5.

[0031] Among them, the height of the bottom of the demolding mechanism 7 is greater than the height of the upper mold 4 when the stamping device 3 stops working. The motion conversion device 9 is used to transmit the lifting and lowering motion of the stamping device 3 to the bidirectional rotation mechanism 6, and control the bidirectional rotation mechanism 6 to rotate in two opposite directions during the lifting and lowering process. The bidirectional rotation mechanism 6 drives the demolding mechanism 7 to reciprocate up and down to generate vibration when the stamping device 3 rises. The bidirectional rotation mechanism 6 drives the demolding mechanism 7 to press down the edge of the workpiece before the stamping device 3 contacts the workpiece, and squeezes the demolding mechanism 7 to undergo elastic deformation.

[0032] In actual application of the present invention, the workpiece is placed on the lower die 2, and then the stamping device 3 is started. The stamping device drives the upper die 4 to descend to perform stamping processing on the workpiece. After the processing is completed, the stamping device 3 drives the upper die 4 away from the lower die 2, and the stamping forming of the workpiece is completed.

[0033] In the process of the punching device 3 driving the upper die 4 to descend, the annular seat 5 is arranged on the peripheral side of the upper die 4 and does not contact the workpiece during the stamping process. The motion conversion device 9 drives the two-way rotation mechanism 6 to rotate in one direction through the descending movement of the punching device 3, so that the demoulding mechanism 7 is driven by the two-way rotation mechanism 6 to extend downward, and before the upper die 4 contacts the workpiece, it abuts against the workpiece and undergoes elastic deformation under the power of the punching device 3, so that the workpiece is preliminarily fixed before being stamped, thereby improving the stability of the workpiece during stamping processing, thereby improving the processing quality of the workpiece.

[0034] After the stamping process of the workpiece is completed, the stamping device 3 drives the upper die 4 to move upward. The workpiece adheres to the upper die 4 under the stamping action of the stamping device 3 (adhesion occurs through the action of the extrusion force). In order to make the workpiece quickly separate from the upper die 4 and prevent the workpiece from falling down with the upper die 4 and injuring the operator, the upward motion of the stamping device 3 is transmitted to the two-way rotating mechanism 6 through the motion conversion device 9, so that the two-way rotating mechanism 6 rotates in the opposite direction. The demoulding mechanism 7 reciprocates in the vertical direction under the drive of the two-way rotating mechanism 6 to form a vibration effect, so that the workpiece is continuously vibrated and disconnected from the upper die 4, thereby realizing rapid separation between the workpiece and the upper die 4, ensuring the processing efficiency of the workpiece, and improving the safety during the processing.

[0035] In the present device, the workpiece is separated from the upper die 4 by the vibration generated by the demolding mechanism 7, and the vibration will be transmitted to the entire workpiece, making the separation process gentler. If the workpiece is directly squeezed to separate from the upper die 4, only the part of the workpiece squeezed by the external force will be subjected to force, which may easily cause the workpiece to deform when it is separated from the upper die 4 by force, thereby affecting the processing quality of the workpiece. The way in which the workpiece and the upper die 4 are separated by the present device can effectively ensure the stamping processing quality of the workpiece, and multiple demolding mechanisms 7 are set to ensure that the workpiece is subjected to uniform force.

[0036] In this embodiment, the upper die 4, the lower die 2 and the punching device 3 are all devices used in the punching technology, and the technical principles of the above structures will not be elaborated in detail here.

[0037] The motion conversion device 9 includes a rack 901 arranged on the bracket 8 in the vertical direction and a gear 902 rotatably connected to the annular seat 5, and the rack 901 is meshed with the gear 902, the gear 902 is fixedly connected to the first bevel gear 903 through a rotating shaft, the first bevel gear 903 is meshed with the second bevel gear 904, and the second bevel gear 904 is connected to the outer wall of the annular seat 5 through a connecting shaft 905, and the bidirectional rotation mechanism 6 is connected to the connecting shaft 905.

[0038] When the motion conversion device 9 is in use, the punching device 3 drives the gear 902 to move up and down through the annular seat 5, and the gear 902 is meshed with the rack 901. Therefore, the gear 902 rotates in two opposite directions during the up and down movement, thereby driving the first bevel gear 903 to rotate synchronously through the rotating shaft, and changing the movement direction through the meshing relationship between the first bevel gear 903 and the second bevel gear 904, thereby driving the connecting shaft 905 to rotate in two opposite directions using the up and down movement of the punching device 3, and then driving the bidirectional rotation mechanism 6 through the connecting shaft 905 to produce two reverse rotations.

[0039] The bidirectional rotating mechanism 6 includes a turntable 601 fixedly connected to the connecting shaft 905 , a plurality of elastic levers 602 are evenly arranged on the circumference of the turntable 601 , an elastic connector 603 is arranged on the outer wall of the annular seat 5 , and a one-way bending component 604 is connected to the elastic connector 603 .

[0040] When the turntable 601 rotates in one direction, the one-way bending component 604 transmits vibration to the demolding mechanism 7 by contacting multiple elastic levers 602 in sequence, and when the turntable 601 rotates in the other direction, the one-way bending component 604 contacts multiple elastic levers 602 in sequence to squeeze the demolding mechanism 7 downward to move downward.

[0041] When the bidirectional rotating mechanism 6 is driven by the connecting shaft 905, the turntable 601 rotates synchronously with the connecting shaft 905, and drives the multiple elastic levers 602 to rotate synchronously. The multiple elastic levers 602 contact the one-way bending component 604 in turn during the rotation. When the stamping device 3 moves downward, the turntable 601 drives the multiple elastic levers 602 to rotate. At this time, the one-way bending component 604 will bend when it is squeezed by the elastic lever 602. The elastic connecting member 603 will be deformed under the squeezing of the elastic lever 602, so that the height of the demolding mechanism 7 drops and is less than the height of the upper mold 4, and presses the edge of the workpiece before the upper mold 4 contacts the workpiece. Because the elastic lever 602 has deformation ability, after the stamping device 3 continues to descend, the elastic lever 60 will be deformed when it contacts the one-way bending component 604, so that it can continue to rotate, so that the workpiece can be continuously pressed, thereby ensuring the normal operation of the entire device.

[0042] When the punching device 3 rises, the elastic lever 602 rotates in the opposite direction to squeeze the one-way bending component 604. The one-way bending component 604 squeezed by the elastic lever 602 rotating in this direction does not bend, and the elastic connecting member 603 drives the one-way bending component 604 to move downward and undergo elastic deformation when squeezed by the elastic lever 602. The elastic lever 602 also deforms and passes through the top of the one-way bending component 604. The demoulding mechanism 7 is squeezed by the one-way bending component 604 and moves downward to press the edge of the workpiece. Compared with when the punching device 3 descends, the demoulding mechanism 7 The downward stroke is larger, so the force on the workpiece is a little larger, and there is a certain gap between the two adjacent elastic levers 602. The top of the one-way bending component 604 is located between the two adjacent elastic levers 602. The one-way bending component 604 will move upward under the elastic force of the elastic connector 603. When the demolding mechanism 7 is not subjected to external force, the bottom height is greater than the bottom height of the upper mold 4. Therefore, the demolding mechanism 7 is regularly subjected to the force of the one-way bending component 604 and vibrates, so that the workpiece is vibrated and quickly disconnected from the upper mold 4, thereby improving the processing efficiency.

[0043] The elastic connecting member 603 includes a sliding seat 605 slidably connected to the annular seat 5, and a first spring 606 connected to the annular seat 5 is connected to one side of the sliding seat 605. A sliding groove 607 is opened on the annular seat 5, and the sliding seat 605 is slidably connected in the sliding groove 607 and slides in the vertical direction. The first spring 606 is arranged in the sliding groove 607.

[0044] When the elastic connecting member 603 is squeezed by the elastic lever 602, the elastic lever 602 squeezes the one-way bending component 604 and drives the slide 605 to slide downward along the slide groove 607. At this time, the first spring 606 is stretched (the first spring 606 can also be set on the other side of the slide 605 and be compressed), so that the one-way bending component 604 can slide up and down in the vertical direction.

[0045] The one-way bending assembly 604 includes a force-bearing plate 608 fixedly connected to the slide seat 605, and a fixed plate 609 and a movable plate 610 are provided at the end of the force-bearing plate 608. The fixed plate 609 is fixedly connected to the end of the force-bearing plate 608, and the movable plate 610 is rotationally connected to the end of the force-bearing plate 608 through a torsion spring, and when the movable plate 610 is not in contact with the elastic lever 602, the movable plate 610 is against the fixed plate 609 through the elastic force of the torsion spring.

[0046] When the one-way bending assembly 604 is in use, the fixed plate 609 contacts the movable plate 610, so that the movable plate 610 is restricted by the fixed plate 609 and can only rotate in one direction, and the movable plate 610 can automatically return to the fixed plate 609 under the elastic force of the torsion spring.

[0047] When the movable plate 610 is squeezed by the elastic lever 602 , the force-bearing plate 608 drives the slide seat 605 to move up and down.

[0048] A slope 611 is disposed on the movable plate 610 at one side facing the fixed plate 609 , and a plurality of strip-shaped protrusions 612 are disposed on the slope 611 at equal intervals.

[0049] The inclined surface 611 is provided to facilitate the passage of the elastic lever 602 . The plurality of bar protrusions 612 are provided so that the elastic lever 602 will contact the plurality of bar protrusions 612 in sequence when sliding on the inclined surface 611 , so that the force-bearing plate 608 continuously rises or falls to obtain a better vibration effect.

[0050] The demoulding mechanism 7 includes a sliding connector 701 slidably connected to the bottom of the force-bearing plate 608 , and the sliding connector 701 can be elastically deformed along the vertical direction. The bottom of the sliding connector 701 is fixedly connected to a pressing plate 702 .

[0051] When the demolding mechanism 7 is in use, the force plate 608 moves downward due to the squeezing of the elastic lever 602, and the pressing plate 702 is driven downward by the sliding connection 701 until it abuts against the surface of the workpiece. Since the sliding connection 701 can be deformed, damage to the pressing plate 702 or the workpiece is avoided when the pressing plate 702 abuts against the workpiece.

[0052] The sliding connection 701 includes a second spring 703 arranged at the bottom of the force-bearing plate 608, and a groove 704 is opened at the bottom of the force-bearing plate 608. A limiting sliding column 705 is slidingly connected in the groove 704, and one end of the second spring 703 is arranged in the groove 704. The second spring 703 is slidably sleeved outside the limiting sliding column 705, and the other end of the second spring 703 is against the top of the pressure plate 702.

[0053] When the pressure plate 702 is in contact with the workpiece, the pressure plate 702 drives the limiting slide 705 to slide along the groove 704 and compress the second spring 703. When the pressure plate 702 is separated from the workpiece or the force plate 608 is away from the workpiece, the second spring 703 will recover and press the limiting slide 705 to slide and reset along the groove 704.

[0054] The above embodiments are only exemplary embodiments of the present application and are not intended to limit the present application. The protection scope of the present application is defined by the claims. Those skilled in the art may make various modifications or equivalent substitutions to the present application within the essence and protection scope of the present application, and such modifications or equivalent substitutions shall also be deemed to fall within the protection scope of the present application.

Claims

1. An automobile parts stamping device, comprising a stamping table (1), characterized in that: The punching table (1) is provided with a lower die (2) and a punching device (3); the punching device (3) is provided with an upper die (4) for closing with the lower die (2) and an annular seat (5) located on the circumference of the upper die (4); two opposite sides of the annular seat (5) are provided with a bidirectional rotation mechanism (6) and a demoulding mechanism (7); the punching table (1) is provided with a plurality of brackets (8) corresponding to the bidirectional rotation mechanism (6); each bracket (8) and the outer wall of the annular seat (5) are provided with a motion conversion device (9); The bottom of the demoulding mechanism (7) has a height greater than that of the upper die (4) when the punching device (3) stops working, the motion conversion device (9) is used to transmit the lifting motion of the punching device (3) to the bidirectional rotation mechanism (6), and to control the bidirectional rotation mechanism (6) to rotate in two opposite directions during the lifting process, the bidirectional rotation mechanism (6) drives the demoulding mechanism (7) to reciprocate up and down to generate vibration when the punching device (3) rises, and the bidirectional rotation mechanism (6) drives the demoulding mechanism (7) to press down the edge of the workpiece before the punching device (3) contacts the workpiece, and squeezes the demoulding mechanism (7) to cause elastic deformation; The motion conversion device (9) comprises a rack (901) arranged on the bracket (8) in a vertical direction and a gear (902) rotatably connected to the annular seat (5), wherein the rack (901) meshes with the gear (902), the gear (902) is fixedly connected to a first bevel gear (903) via a rotating shaft, the first bevel gear (903) meshes with a second bevel gear (904), and the second bevel gear (904) is connected to the outer wall of the annular seat (5) via a connecting shaft (905), and the bidirectional rotation mechanism (6) is connected to the connecting shaft (905); The bidirectional rotating mechanism (6) comprises a rotating disk (601) fixedly connected to a connecting shaft (905), a plurality of elastic levers (602) are evenly arranged on the circumference of the rotating disk (601), an elastic connecting member (603) is arranged on the outer wall of the annular seat (5), and a one-way bending component (604) is connected to the elastic connecting member (603); Wherein, when the rotating disk (601) rotates in one direction, the one-way bending component (604) transmits vibration to the demoulding mechanism (7) by sequentially contacting the plurality of elastic levers (602), and when the rotating disk (601) rotates in the other direction, the one-way bending component (604) sequentially contacts the plurality of elastic levers (602) to press the demoulding mechanism (7) downward to move downward; The elastic connecting member (603) comprises a sliding seat (605) slidably connected to the annular seat (5), one side of the sliding seat (605) is connected to a first spring (606) connected to the annular seat (5), a sliding groove (607) is provided on the annular seat (5), and the sliding seat (605) is slidably connected in the sliding groove (607) and slides in a vertical direction, and the first spring (606) is arranged in the sliding groove (607); The one-way bending assembly (604) comprises a force-bearing plate (608) fixedly connected to the slide seat (605), the end of the force-bearing plate (608) is provided with a fixed plate (609) and a movable plate (610), and the fixed plate (609) is fixedly connected to the end of the force-bearing plate (608), and the movable plate (610) is rotatably connected to the end of the force-bearing plate (608) through a torsion spring, and when the movable plate (610) is not in contact with the elastic lever (602), the movable plate (610) is pressed against the fixed plate (609) through the elastic force of the torsion spring; The demoulding mechanism (7) comprises a sliding connection member (701) that is slidably connected to the bottom of the force-bearing plate (608), and the sliding connection member (701) is capable of elastic deformation in a vertical direction, and a pressing plate (702) is fixedly connected to the bottom of the sliding connection member (701).

2. An automobile parts stamping device according to claim 1, characterized in that: A slope (611) is provided on the movable plate (610) on one side facing the fixed plate (609), and a plurality of strip-shaped protrusions (612) are provided on the slope (611) at equal intervals.

3. The automobile parts stamping device according to claim 1, characterized in that: The sliding connection member (701) includes a second spring (703) arranged at the bottom of the force-bearing plate (608), a groove (704) is opened at the bottom of the force-bearing plate (608), a limiting sliding column (705) is slidably connected in the groove (704), and one end of the second spring (703) is arranged in the groove (704), the second spring (703) is slidably sleeved outside the limiting sliding column (705), and the other end of the second spring (703) is against the top of the pressure plate (702).

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