Wire welding equipment for loudspeaker production

Abstract

The invention relates to the technical field of loudspeakers, in particular to loudspeaker production wire welding equipment which comprises a bottom frame, a placing disc, a motor I, a sliding frame, an electric push rod I, a fixed connecting plate and the like. A containing disc is rotationally connected to the bottom frame, a circular groove is formed in the containing disc, and the containing disc is obliquely arranged. A motor I is fixedly connected to the underframe; an output shaft of the motor I is fixedly connected with the placing disc; a sliding frame is slidably connected into the bottom frame. An electric push rod I is fixedly connected to the underframe; the telescopic end of the electric push rod I is fixedly connected with the sliding frame; a fixed connection plate is fixedly connected to the middle of the sliding frame. The length of the wire harness wire is detected through the camera, it is ensured that the length of the welded wire harness wire is qualified, and the welding quality is ensured; in the welding process, the wire harness is automatically pushed, the loudspeaker and the wire harness do not need to be stably held by two hands of a worker at the same time, and operation is more convenient and safer.

Description

Technical Field

[0001] The present application relates to the technical field of loudspeakers, and in particular to a wire welding device for loudspeaker production. Background Art

[0002] At present, when producing speakers, it is necessary to weld the wire harness to the speaker. Usually, a person holds the speaker with one hand and pinches the wire harness with the other hand, then passes the wire harness wire through the speaker welding positioning hole, and then uses a spot welder to weld the wire harness to the speaker. However, during operation, the person needs to hold the speaker and the wire harness stably with both hands at the same time, which requires a lot of experience, and the person's hands are too close to the spot welder. There is a risk of accidental injury by the spot welder if the operation is improper. In addition, current welding equipment cannot detect the length of the exposed wire of the wire harness. During the wire stripping process, if the operation is improper, such as improper use of the wire stripping tool or unskilled wire stripping technique, the exposed wire will be too short. The wire harness with too short wires cannot form a stable welding connection during welding, which affects the mechanical strength and electrical performance of the welding point and affects the product quality. Summary of the invention

[0003] In order to overcome the shortcomings of current welding equipment that requires manual two-handed holding of the speaker and the wiring harness at the same time, which requires a lot of experience, and the manual two-handed holding is too close to the spot welder, and there is a risk of accidental injury by the spot welder if the operation is slightly improper, the present invention provides a wire welding device for speaker production.

[0004] The technical implementation scheme of the present invention is: a wire welding device for speaker production, including a base frame; also including a placement plate, a motor I, a sliding frame, an electric push rod I, a welding plate, a clamping plate, an automatic laser spot welder, a camera, a receiving plate, a motor II and a pressing plate; a placement plate is rotatably connected to the base frame, a circular groove is opened in the placement plate, and the placement plate is inclined; a motor I is fixedly connected to the base frame; the output shaft of the motor I is fixedly connected to the placement plate; a sliding frame is slidably connected in the base frame; an electric Push rod Ⅰ; the telescopic end of electric push rod Ⅰ is fixedly connected to the sliding frame; a welding plate is fixedly connected to the middle of the sliding frame; a clamping plate is fixedly connected to the right of the welding plate, and a semicircular arc groove is opened on the clamping plate; an automatic laser spot welding machine and a camera are arranged above the bottom frame, the automatic laser spot welding machine is used to fix the wiring harness to the speaker positioning hole, and the camera is located directly above the welding plate; a connecting plate is fixedly connected to the right of the sliding frame; a motor Ⅱ is fixedly connected to the rear of the connecting plate; a pressure plate is fixedly connected to the output shaft of motor Ⅱ; arc grooves are opened in the middle of the connecting plate and the pressure plate.

[0005] Furthermore, a protrusion is arranged on the left part of the base frame.

[0006] Furthermore, the upper part of the circular groove of the placing plate is beveled.

[0007] Furthermore, an arc-shaped rubber sleeve is fixedly connected in the arc-shaped groove in the middle of the receiving plate and the pressing plate.

[0008] Furthermore, the surface of the arc-shaped rubber sleeve is arranged to be rough.

[0009] Furthermore, it also includes an elastic strip; the elastic strip is fixedly connected to the lower right part of the placement plate, and the elastic strip is directly opposite to the welding plate in the left-right direction.

[0010] Furthermore, it also includes an electric wire stripping knife, a mounting frame and an electric push rod II; the electric push rod II is fixedly connected to the base frame; the mounting frame is fixedly connected to the telescopic end of the electric push rod II; two electric wire stripping knives are fixedly connected to the upper part of the mounting frame; the two electric wire stripping knives are symmetrically arranged front and back, and the right side of the clamping plate is located in the middle of the two electric wire stripping knives.

[0011] Furthermore, it also includes a limit plate; two limit plates are connected to the card plate through a torsion spring shaft; the two limit plates are symmetrically arranged front and back; the lower sides of the two limit plates and the semicircular arc grooves of the card plate together form a circular hole.

[0012] Furthermore, the right edge of the circular hole formed by the clamping plate and the limiting plate is beveled.

[0013] Furthermore, it also includes an electric push rod III and a pressure rod; the electric push rod III is fixedly connected to the base frame; the telescopic end of the electric push rod III is fixedly connected to the pressure rod; the front part of the pressure rod is located just above the two limit plates.

[0014] The present invention has the following advantages: 1. The present invention detects the length of the wiring harness wire through a camera to ensure that the length of the welding wiring harness wire is qualified and the welding quality is ensured; during welding, the wiring harness is automatically pushed, and there is no need for manual hands to stably hold the speaker and the wiring harness at the same time, so the operation is more convenient and safer.

[0015] 2. The present invention uses a camera and an electric wire stripper to cut or strip unqualified wires in the wire harness so that the length of the wire harness meets the requirements. This eliminates the need to replace unqualified wire harnesses, which facilitates continuous welding and eliminates the need to move unqualified wire harnesses to a wire stripping station for stripping, thereby improving processing efficiency.

[0016] 3. The present invention allows the bent wire harness to move to the right, and the wire harness is straightened through the circular hole formed by the lower sides of the two limit plates and the semicircular arc grooves of the clamping plate, and then the length of the wire harness is tested to see if it is qualified, avoiding misjudgment due to the bending of the wire harness. At the same time, the straightened wire harness can smoothly pass through the welding positioning hole. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a three-dimensional structural schematic diagram of a wire welding device for speaker production of the present invention; Figure 2It is a schematic diagram of the three-dimensional structure of the placement plate, electric push rod III and pressure rod combination of the wire welding equipment for speaker production of the present invention; Figure 3 It is a schematic diagram of the three-dimensional structure of the base frame, electric push rod I, sliding frame, welding plate, clamping plate, receiving plate and arc-shaped rubber sleeve of the wire welding equipment for speaker production of the present invention; Figure 4 It is a schematic diagram of the combined three-dimensional structure of the electric push rod I, the electric push rod III and the electric push rod II of the wire welding equipment for speaker production of the present invention; Figure 5 It is a schematic diagram of the three-dimensional structure of the electric wire stripper and the mounting frame of the wire welding equipment for speaker production of the present invention; Figure 6 This is a state diagram of the wire bonding equipment for speaker production according to the present invention.

[0018] The meanings of the reference numerals in the figure are: 1-base frame, 2-placing plate, 3-motor I, 4-sliding frame, 5-electric push rod I, 6-welding plate, 7-clamping plate, 12-elastic strip, 13-automatic laser spot welding machine, 14-camera, 21-supporting plate, 22-arc rubber sleeve, 23-motor II, 24-pressure plate, 31-electric push rod III, 32-pressure rod, 33-limiting plate, 42-electric wire stripping knife, 43-mounting frame, 44-electric push rod II. DETAILED DESCRIPTION

[0019] 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. Example 1

[0020] A wire welding device for speaker production, such as Figure 1-Figure 6As shown, it includes a base frame 1; it also includes a placement plate 2, a motor Ⅰ3, a sliding frame 4, an electric push rod Ⅰ5, a welding plate 6, a clamping plate 7, an automatic laser spot welder 13, a camera 14, a receiving plate 21, a motor Ⅱ23 and a pressing plate 24; the base frame 1 is rotatably connected to the placement plate 2, a circular groove is opened in the placement plate 2, and the placement plate 2 is inclined; the base frame 1 is bolted with a motor Ⅰ3; the output shaft of the motor Ⅰ3 is fixedly connected to the placement plate 2; the right part of the base frame 1 is slidably connected to the sliding frame 4; the lower part of the base frame 1 is fixedly connected to the electric push rod Ⅰ5. Rod Ⅰ5; the telescopic end of the electric push rod Ⅰ5 is fixedly connected to the sliding frame 4; a welding plate 6 is welded in the middle of the sliding frame 4; a clamping plate 7 is welded on the right side of the welding plate 6, and a semicircular arc groove is opened on the clamping plate 7; an automatic laser spot welding machine 13 and a camera 14 are arranged above the base frame 1, and the camera 14 is located directly above the welding plate 6; a receiving plate 21 is welded on the right side of the sliding frame 4; a motor Ⅱ 23 is bolted to the rear of the receiving plate 21; a pressure plate 24 is fixedly connected to the output shaft of the motor Ⅱ 23; arc grooves are opened in the middle of the receiving plate 21 and the pressure plate 24.

[0021] Furthermore, in order to support and place the tray 2, a protrusion is provided on the left side of the base frame 1.

[0022] Furthermore, in order to facilitate the placement of the speaker, the upper portion of the circular groove of the placement plate 2 is beveled.

[0023] Furthermore, in order to prevent the wire harness from being crushed, an arc-shaped rubber sleeve 22 is fixedly connected in the arc-shaped groove in the middle of the receiving plate 21 and the pressing plate 24 .

[0024] Furthermore, in order to increase the friction between the arc-shaped rubber sleeve 22 and the wire harness so as to clamp the wire harness and prevent the wire harness from sliding, the surface of the arc-shaped rubber sleeve 22 is roughened.

[0025] Furthermore, it also includes an elastic strip 12; the elastic strip 12 is fixedly connected to the lower right part of the placement plate 2, and the elastic strip 12 is opposite to the welding plate 6 in the left-right direction.

[0026] Furthermore, it also includes an electric wire stripping knife 42, a mounting frame 43 and an electric push rod II 44; the electric push rod II 44 is fixedly connected to the base frame 1; the mounting frame 43 is fixedly connected to the telescopic end of the electric push rod II 44; two electric wire stripping knives 42 are fixedly connected to the upper part of the mounting frame 43; the two electric wire stripping knives 42 are symmetrically arranged front and back, and the right side of the clamping plate 7 is located in the middle of the two electric wire stripping knives 42.

[0027] Step 1: When using, hold the bottom of the speaker with your left hand, and then place the speaker into the circular groove of the placement plate 2. Since the placement plate 2 is tilted, the welding positioning hole on the speaker is in a tilted state. Then rotate the speaker so that the elastic strip 12 is located in the middle of the welding positioning hole, so that the welding positioning hole is directly opposite to the welding plate 6, so as to facilitate the subsequent insertion of the wire harness wire part; then pinch the wire harness with the thumb and index finger of the right hand, and place the exposed right part of the wire harness on the semicircular groove of the card plate 7, so that the wire harness cortex is against the right side of the card plate 7, and then place the wire harness cortex in the groove on the receiving plate 21, and then control the motor II 23 drives the pressure plate 24 to rotate toward the receiving plate 21, so that the receiving plate 21 contacts the pressure plate 24, and the receiving plate 21 and the pressure plate 24 jointly clamp the wire harness; then the camera 14 observes whether the exposed length of the wire harness conductor is qualified. If the wire harness conductor is too short (when the wire harness is welded to the speaker, if the wire harness conductor is too short, a stable welding connection cannot be formed during welding, thereby affecting the mechanical strength and electrical performance of the welding point, and further affecting the product quality), the wire harness needs to be replaced. After replacing the wire harness, repeat the above operation, so that the length of the wire harness conductor is detected by the camera 14 to ensure that the length of the welded wire harness conductor is qualified and the welding quality is ensured.

[0028] It is explained here that when the speaker is placed in the circular groove of the placement plate 2, the speaker can be loaded by an external manipulator or other existing loading equipment, so that manual loading is not required, which helps to reduce the manual workload. At the same time, when the speaker is placed in the circular groove of the placement plate 2, the placement plate 2 can be electrically powered, so that the placement plate 2 can actively drive the speaker to rotate, and the camera 14 can be used to observe the rotation of the speaker, that is, when the placement plate 2 actively drives the speaker to rotate, so that the elastic strip 12 is located in the middle of the speaker welding positioning hole, the placement plate 2 stops driving the speaker to rotate, thereby further reducing the manual workload, and only manual supervision is required on the side. Further, when the wiring harness is placed on the clamping plate 7 and the receiving plate 21, the speaker can also be loaded by an external manipulator or other existing loading equipment, thereby realizing fully automated welding operations and improving welding efficiency.

[0029] Step 2: If the length of the wire harness is qualified, the electric push rod Ⅰ5 is controlled to drive the sliding frame 4 to move to the left on the base frame 1, and the sliding frame 4 drives the welding plate 6, the clamping plate 7, the receiving plate 21, the motor Ⅱ 23 and the pressing plate 24 to move to the left, so that the wire harness moves to the left, so that the welding plate 6 contacts the base frame 1, and presses down the elastic strip 12, so that the elastic strip 12 is located below the horizontal plate of the welding plate 6 to avoid affecting the welding; in this process, there is a gap between the upper part of the clamping plate 7 where the wire harness is placed and the horizontal plate position of the welding plate 6, so as to Figure 6As shown, the wiring harness wire passes through the speaker welding positioning hole, and then the motor Ⅰ3 is controlled to drive the placement plate 2 to rotate downward, so that the lower side of the placement plate 2 contacts the base frame 1 and is in a horizontal state. After the speaker rotates, the lower side of the welding part of the speaker contacts the welding plate 6, and the front part of the wiring harness wire is pressed on the welding plate 6 by the welding part of the speaker, and then the automatic laser spot welder 13 is controlled to descend to weld the wiring harness wire to the welding part of the speaker, thus completing the welding of a wiring harness; in this way, when welding, there is no need for manual hands to stably hold the speaker and the wiring harness at the same time, and the operation is more convenient and safe.

[0030] Step 3: After completing the welding of a wire harness, the control motor I3 drives the placement plate 2 to rotate upward and reset to the position as shown in the figure. Figure 2 The tilted state is shown, and then the motor II 23 is controlled to drive the pressure plate 24 away from the receiving plate 21, so that the receiving plate 21 is separated from the pressure plate 24, and then the speaker is manually rotated so that the other welding positioning hole of the speaker places the elastic strip 12 in the middle, and the welded wiring harness is removed from the clamping plate 7 and the receiving plate 21, and then the first and second steps are repeated to weld another wiring harness to the speaker, thus completing the welding of the wiring harness; finally, the speaker is removed from the placement tray 2.

[0031] In the first step: when the camera 14 observes that the exposed length of the wiring harness wire is too short, the electric push rod II 44 is controlled to drive the electric wire stripping knife 42 and the mounting frame 43 to move to the right, and the moving distance is the missing length of the wiring harness wire. Then the two electric wire stripping knives 42 are controlled to work, so that the cutters of the two electric wire stripping knives 42 move toward each other to cut off part of the wiring harness cortex. The cut part of the wiring harness cortex is the missing length of the wiring harness wire. Then the electric push rod I5 is controlled to drive the sliding frame 4 to move to the right, and the sliding frame 4 drives the welding plate 6, the card plate 7, the receiving plate 21, the motor II 23 and the pressing plate 24 to move to the right, so that the wiring harness moves to the right, so that the wiring harness passes through the cutters of the two electric wire stripping knives 42, and then the wiring harness wire is separated from the cut wiring harness cortex, so that the exposed length of the wiring harness wire meets the requirements and can be welded; when the camera 14 observes that the exposed length of the wiring harness wire is too long, the electric push rod I5 is controlled to drive the sliding frame 4 to move to the right, and the sliding frame 4 drives the welding plate 6, the card plate 7, the receiving plate 21, the motor II 23 and The pressing plate 24 moves to the right, causing the wiring harness to move to the right, so that the excess part of the wiring harness wire is located on the left side of the two electric wire strippers 42, and then the two electric wire strippers 42 are controlled to work, so that the cutters of the two electric wire strippers 42 move toward each other to cut the wiring harness wires, and the cut wiring harness wires fall on the welding plate 6 or the clamping plate 7. The cut wires can be removed by setting an external blowing device or manually, so that the length of the exposed wiring harness wires meets the requirements, and welding can be performed to prevent the exposed wires from being too long after the wiring harness is welded (exposed wires are too long and increase the risk of electric shock, especially in a humid or conductive environment, exposed conductors will more easily cause short circuits or electric shock accidents); in this way, the camera 14 and the electric wire stripper 42 cooperate to cut or strip the unqualified wiring harness wires, so that the length of the wiring harness wires meets the requirements, so that there is no need to replace the unqualified wiring harness wires, so as to facilitate continuous welding, and there is no need to move the unqualified wiring harness to the stripping station for stripping, thereby improving processing efficiency. Example 2

[0032] On the basis of Example 1, Figure 2-Figure 4 As shown, it also includes a limit plate 33; two limit plates 33 are connected to the clamping plate 7 through a torsion spring shaft; the two limit plates 33 are symmetrically arranged front and back; the lower sides of the two limit plates 33 and the semicircular arc grooves of the clamping plate 7 together form a circular hole.

[0033] Furthermore, in order to facilitate the insertion of the wiring harness into the circular hole formed by the lower sides of the two limiting plates 33 and the semicircular arc grooves of the clamping plate 7, the right edge of the circular hole formed by the clamping plate 7 and the limiting plate 33 is beveled.

[0034] Furthermore, it also includes an electric push rod III31 and a pressure rod 32; the electric push rod III31 is fixedly connected to the rear of the base frame 1; the pressure rod 32 is fixedly connected to the telescopic end of the electric push rod III31; the front part of the pressure rod 32 is located directly above the two limit plates 33.

[0035] In the first step of Example 1: the exposed right part of the wire of the wiring harness is placed on the semicircular groove of the card board 7, so that the wire harness cortex is against the right side of the card board 7, and then when the wire harness cortex is placed in the groove on the receiving plate 21, there is no restriction on the part of the wire harness above the card board 7. When it is placed, the wire harness is easily displaced, and it needs to be manually adjusted again after the displacement; therefore, a limiting plate 33 is provided on the card board 7, and when the exposed right part of the wire of the wiring harness is placed on the semicircular groove of the card board 7, the exposed wire of the wiring harness is passed through the circular hole formed by the lower side of the two limiting plates 33 and the semicircular groove of the card board 7, so that the wire harness The cortex is against the two limit plates 33 and the right side of the card plate 7, and then the right part of the wiring harness is placed on the receiving plate 21, and the upper part of the wiring harness conductor is limited by the limit plate 33 to prevent displacement; in the third step of Example 1: the speaker is manually rotated so that the other welding positioning hole of the speaker places the elastic strip 12 in the middle, and when the welded wiring harness is removed from the card plate 7 and the receiving plate 21, the limit plate 33 can be rotated upward around the torsion spring shaft connected to the card plate 7 with a little manual force, so that the wiring harness can be smoothly taken out of the card plate 7. After taking it out, under the action of the torsion spring shaft, the limit plate 33 is rotated back and reset.

[0036] When the wire harness is stripped to expose the welding wire harness conductor, if an inappropriate stripping tool is used (the wire stripper or the cutter is worn), uneven force is applied or the operation is rough, the wire harness conductor will bend when the insulation layer is stripped off; at this time, the length of the wire harness conductor detected by the camera 14 is not the actual length, which will cause misjudgment. If the wire harness conductor is severely bent, the end of the wire harness conductor will be misaligned with the speaker welding positioning hole, and the wire harness conductor will not be able to pass through the welding positioning hole smoothly; at this time, the electric push rod III 31 is controlled to drive the pressure rod 32 to move downward, so that the pressure rod 32 moves down and presses on the limit plate 33 On the top, prevent the bent wire from forcing the limit plate 33 to rotate when moving, affecting the straightening effect, and then control the electric push rod Ⅰ5 to drive the sliding frame 4 to move to the right, and the sliding frame 4 drives the welding plate 6, the clamping plate 7, the receiving plate 21, the motor Ⅱ23 and the pressing plate 24 to move to the right, so that the wiring harness moves to the right, so that the wiring harness wire passes through the circular hole formed by the semicircular arc groove of the lower side of the two limit plates 33 and the clamping plate 7, so that the wiring harness wire is straightened, and then the length of the wiring harness wire is detected to avoid misjudgment due to the bending of the wiring harness wire. At the same time, the straightened wiring harness can pass through the welding positioning hole smoothly.

[0037] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution 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 solution of the present invention can be modified or replaced by equivalents without departing from the essence and scope of the technical solution of the present invention.

Claims

1. A wire welding device for speaker production, comprising a base frame (1); wherein: The invention also comprises a placement plate (2), a motor I (3), a sliding frame (4), an electric push rod I (5), a welding plate (6), a clamping plate (7), an automatic laser spot welding machine (13), a camera (14), a receiving plate (21), a motor II (23) and a pressing plate (24); the placement plate (2) is rotatably connected to the bottom frame (1), a circular groove is formed in the placement plate (2), and the placement plate (2) is arranged in an inclined manner; the motor I (3) is fixedly connected to the bottom frame (1); the output shaft of the motor I (3) is fixedly connected to the placement plate (2); the sliding frame (4) is slidably connected to the bottom frame (1); the electric push rod I (5) is fixedly connected to the bottom frame (1); the telescopic end of the electric push rod I (5) is connected to the sliding frame The movable frame (4) is fixedly connected; a welding plate (6) is fixedly connected to the middle of the sliding frame (4); a clamping plate (7) is fixedly connected to the right of the welding plate (6), and a semicircular arc groove is formed on the clamping plate (7); an automatic laser spot welding machine (13) and a camera (14) are arranged above the bottom frame (1), the automatic laser spot welding machine (13) is used to fix the wiring harness to the speaker positioning hole, and the camera (14) is located directly above the welding plate (6); a receiving plate (21) is fixedly connected to the right of the sliding frame (4); a motor II (23) is fixedly connected to the rear of the receiving plate (21); a pressing plate (24) is fixedly connected to the output shaft of the motor II (23); and arc grooves are formed in the middle of the receiving plate (21) and the pressing plate (24).

2. A wire welding device for speaker production according to claim 1, characterized in that: A protrusion is provided on the left portion of the bottom frame (1).

3. A wire welding device for speaker production according to claim 1, characterized in that: The upper part of the circular groove of the placing plate (2) is provided with an oblique angle.

4. A wire welding device for speaker production according to claim 1, characterized in that: An arc-shaped rubber sleeve (22) is fixedly connected in the arc-shaped groove in the middle of the receiving plate (21) and the pressing plate (24).

5. A wire welding device for speaker production according to claim 4, characterized in that: The surface of the arc-shaped rubber sleeve (22) is rough.

6. A wire welding device for speaker production according to claim 1, characterized in that: It also includes an elastic strip (12); the elastic strip (12) is fixedly connected to the lower right part of the placement plate (2), and the elastic strip (12) is directly opposite to the welding plate (6) in the left-right direction.

7. A wire welding device for speaker production according to claim 6, characterized in that: It also includes an electric wire stripping knife (42), a mounting frame (43) and an electric push rod II (44); the electric push rod II (44) is fixedly connected to the base frame (1); the telescopic end of the electric push rod II (44) is fixedly connected to the mounting frame (43); two electric wire stripping knives (42) are fixedly connected to the upper part of the mounting frame (43); the two electric wire stripping knives (42) are symmetrically arranged front and back, and the right side of the clamping plate (7) is located in the middle of the two electric wire stripping knives (42).

8. A wire welding device for speaker production according to claim 7, characterized in that: It also includes a limit plate (33); two limit plates (33) are connected to the clamping plate (7) via a torsion spring shaft; the two limit plates (33) are symmetrically arranged front to back; the lower sides of the two limit plates (33) and the semicircular arc groove of the clamping plate (7) together form a circular hole.

9. A wire welding device for speaker production according to claim 8, characterized in that: The right edge of the circular hole formed by the clamping plate (7) and the limiting plate (33) is beveled.

10. A wire welding device for speaker production according to claim 9, characterized in that: It also includes an electric push rod III (31) and a pressure rod (32); the electric push rod III (31) is fixedly connected to the base frame (1); the pressure rod (32) is fixedly connected to the telescopic end of the electric push rod III (31); the front part of the pressure rod (32) is located directly above the two limit plates (33).

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