An automobile brake processing device

Abstract

The application relates to the technical field of brake production, and particularly discloses an automobile brake machining device which comprises a valve block, a steel ball and a pressing rod, the upper end surface of the valve block is provided with a flow channel, the steel ball is located directly above the flow channel, the pressing rod is located directly above the steel ball, the pressing rod is fixedly connected with a pressure sensor at the upper end, a centering mechanism is installed below the pressing rod, the centering mechanism is used for detecting whether the pressing rod and the steel ball are deviated, a sealing mechanism is installed on the side wall of the pressing rod, the sealing mechanism is in an inverted ladder shape, and the sealing mechanism is used for sealing the flow above the valve block; through the cooperation of the pressing rod and the centering mechanism, when the pressing rod slowly descends, the centering mechanism can finely correct the steel ball, so that the steel ball and the pressing rod are in the centered state, and the problem that the sealing performance of the valve block is affected due to the deviation of the pressing caused by the poor centering of the steel ball and the pressing head is solved.

Description

Technical Field

[0001] This invention relates to the field of brake manufacturing technology, specifically to an automotive brake processing device. Background Technology

[0002] In the manufacturing process of the system, a key process is to press steel balls into each flow port of the valve block for sealing the brake fluid.

[0003] Existing steel ball press-fitting is accomplished using a servo press. However, the process control only manages the force and displacement at the final press position. This approach fails to detect certain specific failure modes, such as misalignment between the steel ball and the press head leading to press-fitting misalignment, which affects the sealing performance of the valve block. Therefore, we propose a processing device for automotive brakes. Summary of the Invention

[0004] The purpose of this invention is to provide an automotive brake processing device to solve the problem mentioned in the background art, which is that poor alignment between the steel ball and the pressure head leads to press-fit misalignment, thereby affecting the internal sealing of the valve block.

[0005] To achieve the above objectives, the present invention provides the following technical solution: an automotive brake processing device, comprising a valve block, a steel ball, and a pressure rod, wherein a flow channel is provided on the upper end face of the valve block, the steel ball is located directly above the flow channel, and the pressure rod is located directly above the steel ball;

[0006] It also includes a pressure sensor fixedly connected to the upper end of the pressure rod;

[0007] The centering mechanism is installed below the pressure bar and is used to detect whether there is any misalignment between the pressure bar and the steel ball.

[0008] The sealing mechanism is installed on the side wall of the pressure rod. The sealing mechanism is in the shape of an inverted trapezoid and is used to seal the flow above the valve block.

[0009] The centering mechanism includes a positive probe and a negative probe. A groove is provided on the lower end face of the pressure rod, and the positive probe and the negative probe are slidably connected inside the groove. The positive probe is located at the center of the pressure rod axis, and four sets of negative probes are provided and are equally distributed below the pressure rod. The length of the positive probe is greater than the length of the negative probe.

[0010] The groove has an annular groove inside, which is connected to the outside through an air passage. The inner wall of the annular groove is fixedly connected to the first capsule.

[0011] The sealing mechanism includes a first annular frame and a second annular frame. The first annular frame and the second annular frame are slidably connected to the side wall of the pressure rod. The second annular frame is located below the first annular frame. A connecting rod is fixedly connected to the lower end of the first annular frame. Multiple sets of connecting rods are provided and are equidistantly distributed at the lower end of the first annular frame. The lower end of the connecting rod is fixedly connected to the upper end of the second annular frame. The inner walls of the first annular frame and the second annular frame are fixedly connected through a second bladder. The outer walls of the first annular frame and the second annular frame are fixedly connected through a third bladder. A conduit is fixedly connected between the first annular frame and the second annular frame.

[0012] The upper side wall of the pressure rod is equipped with a power-off mechanism, which is used to cooperate with the centering mechanism. The power-off mechanism includes a protective shell and an electromagnet. The protective shell is fixedly connected to the upper side wall of the pressure rod. A bracket is fixedly connected inside the protective shell. An electromagnet is fixedly connected to the end of the bracket away from the protective shell. A limit seat is fixedly connected to the lower end inside the protective shell.

[0013] The limit seat is provided in two sets and located on the left and right sides inside the protective shell. The upper end of the limit seat is provided with a contact point. A contact rod is fixedly connected to the limit seat near the axis of the electromagnet. The contact rod and the contact point are connected by wires.

[0014] The electromagnet has an internal de-energizing part, which includes a lifting rod and an armature. The lifting rod is slidably connected inside the electromagnet, and the lower end of the lifting rod is fixedly connected to the armature. The armature is located between and slidably connected to two sets of limit seats, and the side wall of the armature abuts against the contact rod.

[0015] The upper end of the lifting rod is fixedly connected to a lifting block, the right end face of the lifting block has a slot, and the upper end face of the lifting block has an inclined groove.

[0016] The bracket has a limiting part on top, which includes a connecting frame and a locking block. The connecting frame is fixedly connected to the upper end of the bracket, and a slider is slidably connected to the upper end of the connecting frame. The locking block and a stop bar are fixedly connected to the front end of the slider. The stop bar is located at the right end of the locking block, and the front end of the locking block abuts against the inclined groove. A first spring is fixedly connected to the upper end of the connecting frame through a fixing block, and the free end of the first spring is fixedly connected to the rear end of the slider.

[0017] The upper part of the protective shell is equipped with a locking part, which includes an arc-shaped rod and a barb. The arc-shaped rod is rotatably connected to the upper part of the protective shell through a bearing seat. The left end of the arc-shaped rod abuts against a stop bar. The lower end of the arc-shaped rod is fixedly connected to a barb that cooperates with a slot. The upper part of the protective shell is fixedly connected to a second spring through a fixing block. The free end of the second spring is fixedly connected to the right end of the arc-shaped rod. A baffle is fixedly connected to the front end of the arc-shaped rod. A push rod is slidably connected inside the protective shell. The left end of the push rod extends through to the outside of the protective shell, and the right end of the push rod abuts against the left end of the baffle.

[0018] This invention has at least the following beneficial effects:

[0019] This invention, through the cooperation of a pressure rod and an alignment mechanism, ensures that as the pressure rod slowly descends, the positive probe in the alignment mechanism first contacts the steel ball. As the pressure rod continues to descend, if there is a misalignment between the steel ball and the pressure rod, the steel ball first contacts one or two negative probes, thus forming a closed circuit with an external motor. This drives the external drive motor to operate, fine-tuning the position of the valve block until all four negative probes simultaneously contact the steel ball, achieving the correction purpose. When all four negative probes simultaneously contact the steel ball, the current passing through the positive probe increases. Combined with a power-off mechanism, this disconnects the power to the positive probe, preventing the external drive motor from continuously operating. This solves the problem of misalignment between the steel ball and the pressure head, leading to pressure misalignment and affecting the internal sealing of the valve block. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the overall main structure of the present invention;

[0021] Figure 2 This is a schematic diagram of the cross-sectional structure of the pressure bar of the present invention;

[0022] Figure 3 For the present invention Figure 2 Enlarged structural diagram of section A;

[0023] Figure 4 This is a schematic cross-sectional view of the sealing mechanism of the present invention;

[0024] Figure 5 This is a schematic diagram of the main cross-sectional structure of the power-off mechanism of the present invention;

[0025] Figure 6 This is a cross-sectional view of the power-off mechanism of the present invention.

[0026] Figure 7 This is a schematic diagram of the left-side cross-sectional structure of the power-off mechanism of the present invention;

[0027] Figure 8 This is a schematic diagram of the cross-sectional structure of the valve block of the present invention;

[0028] Figure 9 For the present invention Figure 8 Enlarged structural diagram of section B;

[0029] Figure 10 This is a schematic diagram of the press-fit curve structure of the present invention;

[0030] Figure 11 This is a schematic diagram of the press-fitting process structure of the present invention.

[0031] In the diagram: 1. Valve block; 11. Flow channel; 2. Steel ball; 3. Pressure rod; 4. Centering mechanism; 41. Groove; 42. Positive probe; 43. Negative probe; 44. Annular groove; 45. First capsule; 5. Sealing mechanism; 51. First annular frame; 52. Second annular frame; 53. Connecting rod; 54. Second capsule; 55. Third capsule; 56. Conduit; 6. Power-off mechanism; 61. Protective shell; 62. Support; 63. Electromagnet; 64. Power-off section 641. Lifting rod; 642. Lifting block; 643. Slot; 644. Inclined slot; 645. Armature; 65. Limiting part; 651. Connecting frame; 652. Slider; 653. Locking block; 654. Stop bar; 655. First spring; 66. Locking part; 661. Arc rod; 662. Barb; 663. Baffle; 664. Second spring; 67. Push rod; 68. Limiting seat; 681. Contact rod; 682. Contact point; 7. Pressure sensor. Detailed Implementation

[0032] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0033] Please see Figure 1-11 The present invention provides a technical solution: Example 1

[0034] An automotive brake processing device includes a valve block 1, a steel ball 2, and a pressure rod 3. A flow channel 11 is formed on the upper surface of the valve block 1. The steel ball 2 is located directly above the flow channel 11, and the pressure rod 3 is located directly above the steel ball 2. The device also includes a pressure sensor 7 fixedly connected to the upper end of the pressure rod 3. A centering mechanism 4 is installed below the pressure rod 3 and is used to detect whether there is any misalignment between the pressure rod 3 and the steel ball 2. A sealing mechanism 5 is installed on the side wall of the pressure rod 3 and is in the shape of an inverted trapezoid. The sealing mechanism 5 is used to seal the flow above the valve block 1.

[0035] With the cooperation of the pressure rod 3 and the centering mechanism 4, the centering mechanism 4 can make fine adjustments to the steel ball 2 as the pressure rod 3 slowly descends, so that the steel ball 2 and the pressure rod 3 are in a centered state. This solves the problem of misalignment between the steel ball 2 and the pressure head, which leads to pressure displacement and affects the internal sealing of the valve block 1.

[0036] The centering mechanism 4 includes a positive probe 42 and a negative probe 43. A groove 41 is provided on the lower end face of the pressure rod 3. The positive probe 42 and the negative probe 43 are slidably connected inside the groove 41. The positive probe 42 is located at the center of the axis of the pressure rod 3. Four sets of negative probes 43 are provided and are equally distributed below the pressure rod 3. The length of the positive probe 42 is greater than the length of the negative probe 43.

[0037] The positive probe 42 first contacts the steel ball 2, and then the pressure rod 3 continues to descend slowly. If the steel ball 2 and the pressure rod 3 are misaligned, the steel ball 2 will first contact one or two of the negative probes 43, thus forming a closed circuit with the external motor, thereby driving the external drive motor to operate and finely adjust the position of the valve block 1 until all four negative probes 43 contact the steel ball 2 at the same time, thereby achieving the purpose of correction and solving the problem of poor alignment between the steel ball 2 and the pressure head.

[0038] from Figures 9-11 As can be seen, the entire process consists of 5 steps, each corresponding to a different point on the curve (A, B, C). Meanwhile, the windows set on the curve (01, 02, 03, 05) correspond to the controlled items and upper and lower limits.

[0039] Point A on the pressing curve is the press origin, and point B is the position monitored by pressure sensor 7 at 100N. The section from A to B includes pressing steps 1, 2, and 3. Point C on the pressing curve is the end point of the pressing position, and the section from B to C includes pressing steps 4 and 5. The press eventually returns from point C to point A, completing the entire process.

[0040] Step 1: The pressure head of the pressure rod 3 is quickly pressed down from the origin position to above the steel ball 2, but does not touch the steel ball 2; at this time, the pressure curve monitoring window 01 is responsible for monitoring the entire process and ensuring that the force does not exceed 100N. This can monitor failure modes such as incorrect position of the steel ball 2 and poor alignment of the pressure head.

[0041] Step 2: The pressure head of the pressure rod 3 is slowly pressed down until it contacts the steel ball 2. When the pressure sensor 7 detects 100N, it stops. At this time, the pressure curve monitoring window 03 will continuously iterate and calculate the slope of the curve to find the point of sudden change. This point is called the inflection point. By monitoring the force and displacement value of the inflection point, the slippage of the steel ball 2 and the failure mode of the raw material dimensional deviation can be monitored.

[0042] Step 3: After finding the 100N point in Step 2, clear the current absolute displacement to zero and re-record the position value to facilitate subsequent monitoring of the position of steel ball 2 at different heights.

[0043] Step 4: The press continues to press down slowly until it reaches the maximum set force value, then stops. The monitoring window 02 is used to determine whether the final position of the press is within the acceptable range set by the process.

[0044] Step 5: Using the force at which you stopped in Step 4 as a reference, hold for 3 seconds to ensure that the material does not spring back after deformation. Use the displacement difference in monitoring window 05 to determine whether the amount of material deformation is within the acceptable range. Example 2

[0045] A power-off mechanism 6 is provided on the upper side wall of the pressure rod 3. The power-off mechanism 6 is used to cooperate with the centering mechanism 4. The power-off mechanism 6 includes a protective shell 61 and an electromagnet 63. The protective shell 61 is fixedly connected to the upper side wall of the pressure rod 3. A bracket 62 is fixedly connected inside the protective shell 61. The electromagnet 63 is fixedly connected to the end of the bracket 62 away from the protective shell 61. A limit seat 68 is fixedly connected to the lower end inside the protective shell 61. Two sets of limit seats 68 are provided and located on the left and right sides inside the protective shell 61. A contact point 682 is provided on the upper end of the limit seat 68. A contact rod 681 is fixedly connected to the limit seat 68 near the axis of the electromagnet 63. Electromagnet 681 and contact 682 are connected by wires. Electromagnet 63 has a power-off section 64 inside, which includes a lifting rod 641 and an armature 645. The lifting rod 641 is slidably connected inside electromagnet 63, and the lower end of the lifting rod 641 is fixedly connected to the armature 645. The armature 645 is located between and slidably connected to two sets of limit seats 68. The side wall of the armature 645 abuts against the contact rod 681. A lifting block 642 is fixedly connected to the upper end of the lifting rod 641. A slot 643 is provided on the right end face of the lifting block 642, and a slanted groove 644 is provided on the upper end face of the lifting block 642. A limit part 645 is provided above the bracket 62. 5. The limiting part 65 includes a connecting frame 651 and a locking block 653. The connecting frame 651 is fixedly connected to the upper end of the bracket 62. The slider 652 is slidably connected to the upper end of the connecting frame 651. The locking block 653 and the stop bar 654 are fixedly connected to the front end of the slider 652. The stop bar 654 is located at the right end of the locking block 653. The front end of the locking block 653 abuts against the inclined groove 644. The first spring 655 is fixedly connected to the upper end of the connecting frame 651 through a fixing block. The free end of the first spring 655 is fixedly connected to the rear end of the slider 652. A locking part 66 is provided inside the upper end of the protective shell 61. The locking part 66 includes an arc-shaped rod 661 and a barb. 662, an arc-shaped rod 661 is rotatably connected to the upper part of the inner shell 61 through a bearing seat. The left end of the arc-shaped rod 661 abuts against the stop bar 654. A barb 662 is fixedly connected to the lower end of the arc-shaped rod 661. The barb 662 cooperates with the slot 643. A second spring 664 is fixedly connected to the upper part of the inner shell 61 through a fixing block. The free end of the second spring 664 is fixedly connected to the right end of the arc-shaped rod 661. A baffle 663 is fixedly connected to the front end of the arc-shaped rod 661. A push rod 67 is slidably connected inside the protective shell 61. The left end of the push rod 67 extends through to the outside of the protective shell 61. The right end of the push rod 67 abuts against the left end of the baffle 663.

[0046] When all four negative probes 43 are in contact with the steel ball 2 simultaneously, the current to the positive probe 42 increases. Since the coil wound around the electromagnet 63 is connected to the positive probe 42, the magnetism of the electromagnet 63 is increased, causing the electromagnet 63 to reach the critical value for attracting the armature 645. This causes the armature 645 to move upward. When the armature 645 reaches its highest point, it disengages from the contact rod 681, thus achieving the effect of de-energizing. As the armature 645 moves upward, it causes the lifting rod 641 to move upward. The upward movement of the lifting rod 641 causes the lifting block 642 to move upward. The upward movement of the lifting block 642 pushes the locking block 653 to move backward, thereby causing the slider 652 to move backward. The backward movement of the slider 652 causes the stop rod 654 to move backward. When the stop rod 654 disengages from the arc rod 661, the second spring 664 acts as a stop. The downward-pushing arc rod 661 rotates, causing the barb 662 to move, thus engaging the barb 662 with the slot 643. This prevents the armature 645 from moving downwards under gravity and thus connecting the circuit. When the arc rod 661 rotates, it pushes the push rod 67 to the left. When the barb 662 engages with the slot 643, simply push the push rod 67 to the right to move the arc rod 661, causing the barb 662 to disengage from the slot 643. At this point, the armature 645 moves downwards under gravity, returning to its initial position. Simultaneously, the slider 652 moves forward under the action of the first spring 655, causing the slot 653 to re-engage with the inclined groove 644. At the same time, the stop rod 654 moves to the left end of the arc rod 661 and engages with it, facilitating the power-off effect during the next test. Example 3

[0047] An annular groove 44 is formed inside the groove 41. The annular groove 44 is connected to the outside through an air passage. A first bladder 45 is fixedly connected to the inner wall of the annular groove 44. The sealing mechanism 5 includes a first annular frame 51 and a second annular frame 52. The first annular frame 51 and the second annular frame 52 are slidably connected to the side wall of the pressure rod 3. The second annular frame 52 is located below the first annular frame 51. A connecting rod 53 is fixedly connected to the lower end of the first annular frame 51. Multiple sets of connecting rods 53 are provided and are equidistantly distributed at the lower end of the first annular frame 51. The lower end of the connecting rod 53 is fixedly connected to the upper end of the second annular frame 52. The inner walls of the first annular frame 51 and the second annular frame 52 are fixedly connected through a second bladder 54. The outer walls of the first annular frame 51 and the second annular frame 52 are fixedly connected through a third bladder 55. A conduit 56 is fixedly connected between the first annular frame 51 and the second annular frame 52.

[0048] When the steel ball 2 is pressed into the flow channel 11 by the pressure rod 3, the first annular frame 51 slides down, so that the second annular frame 52 moves into the flow channel 11 and the outer wall of the third bladder 55 is completely in contact with the inner wall of the flow channel 11. As the third bladder 55 is compressed, the air between the second annular frame 52 and the first annular frame 51 is compressed, thereby pushing the second bladder 54. Then the second bladder 54 comes into contact with the side wall of the pressure rod 3, thereby increasing its airtightness. Then, the air inside the flow channel 11 above the steel ball 2 is extracted by an external negative pressure machine connected to the conduit 56, thereby checking the airtightness of the steel ball 2 in the flow channel 11.

[0049] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0050] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. An automotive brake processing device, comprising a valve block (1), a steel ball (2) and a pressure rod (3), wherein a flow channel (11) is provided on the upper end face of the valve block (1), the steel ball (2) is located directly above the flow channel (11), and the pressure rod (3) is located directly above the steel ball (2); Its features are: It also includes a pressure sensor (7) fixedly connected to the upper end of the pressure rod (3); Centering mechanism (4), which is installed below the pressure rod (3), is used to detect whether there is an offset between the pressure rod (3) and the steel ball (2); A sealing mechanism (5) is installed on the side wall of the pressure rod (3). The sealing mechanism (5) is in the shape of an inverted trapezoid and is used to seal the flow above the valve block (1). The centering mechanism (4) includes a positive probe (42) and a negative probe (43). The lower end face of the pressure rod (3) is provided with a groove (41). The positive probe (42) and the negative probe (43) are slidably connected inside the groove (41). The positive probe (42) is located at the center of the axis of the pressure rod (3). The negative probe (43) is provided in four groups and is equally distributed below the pressure rod (3). The length of the positive probe (42) is greater than the length of the negative probe (43). The groove (41) has an annular groove (44) inside, the annular groove (44) is connected to the outside through an air passage, and a first bladder (45) is fixedly connected to the inner wall of the annular groove (44). A power-off mechanism (6) is provided on the upper side wall of the pressure rod (3). The power-off mechanism (6) is used to cooperate with the centering mechanism (4). The power-off mechanism (6) includes a protective shell (61) and an electromagnet (63). The protective shell (61) is fixedly connected to the upper side wall of the pressure rod (3). A bracket (62) is fixedly connected inside the protective shell (61). An electromagnet (63) is fixedly connected to the end of the bracket (62) away from the protective shell (61). A limit seat (68) is fixedly connected to the lower end inside the protective shell (61). The limiting seat (68) is provided in two sets and located on the left and right sides inside the protective shell (61). The upper end of the limiting seat (68) is provided with a contact point (682). The limiting seat (68) is fixedly connected to a contact rod (681) near the axis of the electromagnet (63). The contact rod (681) and the contact point (682) are electrically connected by wires. The electromagnet (63) is provided with a power-off part (64), which includes a lifting rod (641) and an armature (645). The lifting rod (641) is slidably connected inside the electromagnet (63), and the lower end of the lifting rod (641) is fixedly connected to the armature (645). The armature (645) is located between and slidably connected to the two sets of limiting seats (68), and the side wall of the armature (645) abuts against the contact rod (681). The method by which the centering mechanism (4) and the power-off mechanism (6) cooperate to detect and adjust misalignment between the steel ball (2) and the pressure rod (3) is as follows: During the descent of the pressure rod (3), the positive probe (42) of the centering mechanism (4) first contacts the steel ball (2). If there is a deviation, the steel ball (2) will first contact one or two negative probes (43), and then form a closed loop with the external drive motor. The drive motor runs and makes a fine adjustment to the position of the valve block (1) until the four negative probes (43) contact the steel ball (2) at the same time to complete the correction. When the four negative probes (43) contact the steel ball (2) at the same time, the current of the positive probe (42) will increase. The electromagnet (63) of the power-off mechanism (6) is connected to the positive probe (42). The increase in current makes the electromagnet (63) more magnetic and attracts the armature (645) inside it to move upward, so that the armature (645) and the contact rod (681) are disengaged and the circuit is cut off to prevent the drive motor from running continuously.

2. The automotive brake processing apparatus according to claim 1, characterized in that: The sealing mechanism (5) includes a first ring frame (51) and a second ring frame (52). The first ring frame (51) and the second ring frame (52) are slidably connected to the side wall of the pressure rod (3). The second ring frame (52) is located below the first ring frame (51). A connecting rod (53) is fixedly connected to the lower end of the first ring frame (51). Multiple sets of the connecting rod (53) are provided and are equidistantly distributed at the lower end of the first ring frame (51). The lower end of the connecting rod (53) is fixedly connected to the upper end of the second ring frame (52). The inner walls of the first ring frame (51) and the second ring frame (52) are fixedly connected through a second bladder (54). The outer walls of the first ring frame (51) and the second ring frame (52) are fixedly connected through a third bladder (55). A conduit (56) is fixedly connected between the first ring frame (51) and the second ring frame (52).

3. The automotive brake processing apparatus according to claim 1, characterized in that: The upper end of the lifting rod (641) is fixedly connected to a lifting block (642), the right end face of the lifting block (642) is provided with a slot (643), and the upper end face of the lifting block (642) is provided with a slanted groove (644).

4. The automotive brake processing apparatus according to claim 1, characterized in that: A limiting part (65) is provided above the bracket (62). The limiting part (65) includes a connecting frame (651) and a locking block (653). The connecting frame (651) is fixedly connected to the upper end of the bracket (62). A slider (652) is slidably connected to the upper end of the connecting frame (651). The locking block (653) and a stop bar (654) are fixedly connected to the front end of the slider (652). The stop bar (654) is located at the right end of the locking block (653). The front end of the locking block (653) abuts against the inclined groove (644). A first spring (655) is fixedly connected to the upper end of the connecting frame (651) through a fixing block. The free end of the first spring (655) is fixedly connected to the rear end of the slider (652).

5. The automotive brake processing apparatus according to claim 1, characterized in that: The upper part of the protective shell (61) is provided with a locking part (66), which includes an arc-shaped rod (661) and a barb (662). The arc-shaped rod (661) is rotatably connected to the upper part of the protective shell (61) through a bearing seat. The left end of the arc-shaped rod (661) abuts against the stop bar (654), and the lower end of the arc-shaped rod (661) is fixedly connected to the barb (662). The barb (662) cooperates with the slot (643). The upper part of the protective shell (61) is fixedly connected to a second spring (664) by a fixing block. The free end of the second spring (664) is fixedly connected to the right end of the arc rod (661). The front end of the arc rod (661) is fixedly connected to a baffle (663). The protective shell (61) is slidably connected to a push rod (67). The left end of the push rod (67) extends through to the outside of the protective shell (61). The right end of the push rod (67) abuts against the left end of the baffle (663).

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