Intelligent direct current screen integrated with battery internal resistance and system insulation detection function

Abstract

The utility model relates to the field of battery internal resistance detection, in particular to an intelligent direct current screen integrated with a battery internal resistance and system insulation detection function. The upper end of the detection bench is provided with a belt conveyor. According to the utility model, the moving mechanism is arranged, the electric cylinder in the moving mechanism drives the connecting frame to descend, so that the rack is engaged with the gear ring on the side wall of the power connection head, the rodless cylinder drives the rack to move transversely, the gear ring and the insulating cylinder are further driven to rotate, and the conductive layer on the inner wall of the insulating cylinder is in contact with the side wall of the power connection head along with rotation; the conductive layer and a conductive plug in the power connection head form a conduction loop, a circuit in the control box triggers the red light to be turned on, the conductivity of the side wall of the cylindrical power connection head is detected, meanwhile, the lower end of the insulating cylinder is attached to an insulating ring of the power connection head, a closed detection area is formed, and the conductivity of the side wall of the cylindrical power connection head can be detected by monitoring whether the circuit leaks electricity or not. Therefore, the problem that the traditional device cannot detect electric leakage and the conductivity of the side wall is solved.

Description

Technical Field

[0001] The utility model belongs to the field of battery internal resistance detection, and particularly relates to an intelligent DC power supply panel integrating battery internal resistance and system insulation detection functions. Background Technique

[0002] With the development of new energy technologies such as electric vehicles and energy storage systems, the requirements for the safety and reliability of batteries are continuously increasing. Battery internal resistance and system insulation are important indicators affecting battery performance and safety. After battery production, it is necessary to detect the battery internal resistance.

[0003] Currently, the utility model with the application number CN202222267238.3 discloses an on-line detection device for the internal resistance of a storage battery, including a bottom plate. A frame is hot-melt connected to the top of the bottom plate, and a fixing component is installed on the surface of the frame. This on-line detection device for the internal resistance of a storage battery is equipped with components such as a fixed resistor, a variable resistor, a voltmeter, and an ammeter through structures such as a bottom plate and a frame. It forms a closed circuit by contacting the battery electrodes with conductive sheets. First, measure the voltage and current when the storage battery is connected, and then replace the battery with a variable resistor and connect it to the same circuit. By adjusting its resistance value to make the voltage and current the same as when measuring the battery, the resistance value displayed by the variable resistor at this time is the internal resistance of the storage battery, realizing on-line detection without disassembling the battery and solving the problems of high consumption of manpower and material resources and low efficiency caused by traditional off-line detection. However, when this scheme detects the internal resistance of the battery, it is difficult to detect the leakage of the battery input end and output end, and it is impossible to detect the conductivity of the side walls of the cylindrical input end and output end, and further improvement is needed. Summary of the Utility Model

[0004] In order to overcome the problems that the existing on-line detection device for the internal resistance of a storage battery is difficult to detect the leakage of the battery input end and output end and cannot detect the conductivity of the side walls of the cylindrical input end and output end, an intelligent DC power supply panel integrating battery internal resistance and system insulation detection functions is proposed.

[0005] The technical solution of the utility model is as follows: an intelligent DC power supply panel integrating battery internal resistance and system insulation detection functions, including a detection table; a belt conveyor is arranged at the upper end of the detection table, and a storage battery is placed on the upper end of the belt conveyor. A first moving frame and a second moving frame are arranged above the detection table. An internal resistance testing mechanism is arranged on the first moving frame, and a moving mechanism is installed on the second moving frame;

[0006] Two power connection heads are arranged at the upper end of the storage battery. An insulating ring is fixedly connected to the lower part of the side wall of the power connection head, and a conductive plug is inserted into the inner wall of the power connection head. An insulating rod is fixedly connected to the upper end of the conductive plug;

[0007] A power measurement mechanism is arranged on the upper part of the side wall of the power connection head, and the moving mechanism is adapted to the power measurement mechanism;

[0008] The moving mechanism includes an electric cylinder, a connecting frame, a rodless cylinder, and a rack; an electric cylinder is installed on the second moving frame, the lower end of the output shaft of the electric cylinder is fixedly connected to the connecting frame, the rodless cylinder is fixedly connected to the connecting frame, and the rack is fixedly connected to the moving end of the rodless cylinder;

[0009] An insulating cylinder is sleeved on the upper part of the side wall of the power connection head. The lower end of the insulating cylinder is in contact with the upper end of the insulating ring. A toothed ring is fixedly connected to the side wall of the insulating cylinder. A control box and a support block are fixedly connected to the upper end of the insulating cylinder. A control circuit board and a lithium battery are arranged in the control box. A red light is fixedly connected to the upper end of the support block. A conductive layer is arranged on the inner wall of the insulating cylinder and is located directly below the inner side of the support block. The toothed ring and the rack are meshed with each other.

[0010] Furthermore, two limiting plates are fixedly connected to the upper end of the detection table. The two sides of the storage battery are respectively in contact with one end of the two limiting plates close to each other. The upper end of the storage battery is higher than the upper end of the limiting plate.

[0011] Furthermore, the part of the inner wall of the insulating cylinder except the conductive layer is made of insulating material, and the upper end of the insulating cylinder is higher than the upper end of the power connection head.

[0012] Furthermore, the display component includes a bracket and a display screen; a bracket is fixedly connected to the side end of the detection table, and a display screen is fixedly connected to the upper end of the bracket.

[0013] Furthermore, the internal resistance testing mechanism includes a bearing plate, a voltmeter, an ammeter, a support box, a variable resistor, and a fixed resistor; a bearing plate is fixedly connected to one end of the first moving frame close to the moving mechanism. The voltmeter and the ammeter are placed on the upper end of the bearing plate. A fixed resistor is placed on the upper end of the first moving frame. A support box is fixedly connected to the lower end of the bearing plate, and a variable resistor is placed inside the support box.

[0014] Furthermore, a camera is fixedly connected to one end of the first moving frame away from the moving mechanism.

[0015] Furthermore, two first fixing blocks are fixedly connected to both sides of the upper end of the detection table. The first limiting column is fixedly connected to the end of the two first fixing blocks on the same side close to each other. The limiting cylinder is fixedly connected to one end of the first moving frame close to the moving mechanism in a penetrating manner. The inner wall of the limiting cylinder is in contact with the side wall of the first limiting column.

[0016] Furthermore, two second fixing blocks are fixedly connected to one side of the detection table. The two second limiting columns are fixedly connected to the end of the two second fixing blocks close to each other. The second moving frame is slidably sleeved on the side walls of the two second limiting columns.

[0017] The beneficial effects of the present utility model:

[0018] 1. Insert the conductive plug in the internal resistance testing mechanism into the battery power connection head, forming a closed loop with the fixed resistor, adjustable resistor, voltmeter, and ammeter. First, measure the voltage and current when the battery is connected. Then, replace the battery with the adjustable resistor in the same circuit and adjust its resistance to make the voltage and current the same as when measuring the battery. At this time, the resistance value displayed by the adjustable resistor is the internal resistance of the battery. The online internal resistance detection without disassembling the battery is realized by using the equivalent resistance method, improving the detection efficiency and reducing the consumption of manpower and material resources;

[0019] 2. The electric cylinder in the moving mechanism drives the connecting frame to descend, making the rack engage with the toothed ring on the side wall of the power connection head. The rodless cylinder drives the rack to move horizontally, thereby driving the toothed ring and the insulating cylinder to rotate. The conductive layer on the inner wall of the insulating cylinder contacts the side wall of the power connection head as it rotates. If there is abnormal conductivity on the side wall (such as insulation breakdown), the conductive layer forms a conduction loop with the conductive plug inside the power connection head, and the circuit in the control box triggers the red light to turn on, realizing the detection of the conductivity of the side wall of the cylindrical power connection head. At the same time, the lower end of the insulating cylinder fits with the insulating ring of the power connection head, forming a closed detection area. The insulation performance of the battery input and output ends can be judged by monitoring whether the circuit leaks electricity, solving the problem that the traditional device cannot detect leakage and the conductivity of the side wall;

[0020] 3. The limiting plate on the detection table positions the battery. The first and second limiting columns cooperate with the limiting cylinder and the second moving frame respectively to ensure the stability of the first moving frame and the second moving frame during movement. The camera can assist in aligning with the power connection head and observing the red light turning on, which is convenient to use;

[0021] 4. Integrate the battery internal resistance detection and the system insulation detection into the same device. Through the coordinated movement of the conductive plug, insulating cylinder, moving mechanism, and electricity detection mechanism, multi-dimensional performance detection is realized, meeting the high requirements of new energy batteries for safety and reliability. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 The three-dimensional structure diagram of the present utility model is shown;

[0023] Figure 2 The three-dimensional structure diagram of the display component of the present utility model is shown;

[0024] Figure 3 The three-dimensional structure diagram of the power connection head of the present utility model is shown;

[0025] Figure 4 The three-dimensional structure diagram of the conductive plug of the present utility model is shown;

[0026] Figure 5 The three-dimensional structure diagram of the electricity detection mechanism of the present utility model is shown;

[0027] Figure 6 The figure shows a three-dimensional structural schematic diagram of the moving mechanism of the present utility model;

[0028] Figure 7 The figure shows a three-dimensional structural schematic diagram of the internal resistance testing mechanism of the present utility model;

[0029] Figure 8 The figure shows a three-dimensional structural schematic diagram of the first limiting column of the present utility model;

[0030] Figure 9 The figure shows a three-dimensional structural schematic diagram of the second limiting column of the present utility model.

[0031] The reference signs in the drawings are: 1, detection table; 2, belt conveyor; 3, display component; 31, bracket; 32, display screen; 4, first moving frame; 41, bearing plate; 42, voltmeter; 43, ammeter; 44, support box; 45, adjustable resistor; 46, fixed-value resistor; 47, camera; 5, second moving frame; 6, moving mechanism; 61, electric cylinder; 62, connecting frame; 63, rodless cylinder; 64, rack; 7, storage battery; 8, electric testing mechanism; 81, insulating cylinder; 82, toothed ring; 83, control box; 84, support block; 85, red light; 86, conductive layer; 9, limiting plate; 10, power connection head; 11, insulating ring; 12, conductive plug; 13, insulating rod; 14, first fixing block; 15, first limiting column; 16, second fixing block; 17, second limiting column. Detailed implementation manners

[0032] The present utility model will be further described below with reference to the drawings and embodiments.

[0033] Please refer to Figures 1-9 , the present utility model provides an embodiment: an intelligent DC panel integrating the functions of battery internal resistance and system insulation detection, including a detection table 1; a belt conveyor 2 is arranged at the upper end of the detection table 1, a storage battery 7 is placed on the upper end of the belt conveyor 2, a first moving frame 4 and a second moving frame 5 are arranged above the detection table 1, an internal resistance testing mechanism is provided on the first moving frame 4, and a moving mechanism 6 is installed on the second moving frame 5;

[0034] Two power connection heads 10 are arranged at the upper end of the storage battery 7, an insulating ring 11 is fixedly connected to the lower part of the side wall of the power connection head 10, a conductive plug 12 is inserted into the inner wall of the power connection head 10, and an insulating rod 13 is fixedly connected to the upper end of the conductive plug 12;

[0035] An electric testing mechanism 8 is arranged on the upper part of the side wall of the power connection head 10, and the moving mechanism 6 is adapted to the electric testing mechanism 8;

[0036] The moving mechanism 6 includes an electric cylinder 61, a connecting frame 62, a rodless cylinder 63, and a rack 64; an electric cylinder 61 is installed on the second moving frame 5, the lower end of the output shaft of the electric cylinder 61 is fixedly connected to the connecting frame 62, the rodless cylinder 63 is fixedly connected to the connecting frame 62, and the rack 64 is fixedly connected to the moving end of the rodless cylinder 63;

[0037] An insulating cylinder 81 is sleeved on the upper part of the side wall of the electrical connector 10. The lower end of the insulating cylinder 81 is in contact with the upper end of the insulating ring 11. A toothed ring 82 is fixedly connected to the side wall of the insulating cylinder 81. A control box 83 and a support block 84 are fixedly connected to the upper end of the insulating cylinder 81. A control circuit board and a lithium battery are arranged in the control box 83. A red light 85 is fixedly connected to the upper end of the support block 84. A conductive layer 86 is arranged on the inner wall of the insulating cylinder 81 and is located directly below the inner side of the support block 84. The toothed ring 82 and the rack 64 are meshed with each other.

[0038] During use, place the storage battery 7 on the belt conveyor 2, manually move the first moving frame 4 so that the first moving frame 4 moves to a suitable position above the inspection table 1, use the internal resistance testing mechanism on the first moving frame 4 to test the internal resistance of the storage battery 7. After the test is completed, start the belt conveyor 2 to move the storage battery 7, manually move the second moving frame 5 to adjust the position of the moving mechanism 6 so that the rack 64 and the toothed ring 82 are meshed with each other, start the rodless cylinder 63 to move the rack 64, which can drive the toothed ring 82 to rotate, so that the insulating cylinder 81 can be rotated. When the conductive layer 86 touches the side wall of the electrical connector 10, it can detect whether the side wall of the electrical connector 10 is leaking electricity. When there is a leakage, the red light 85 will light up, which is convenient for the staff to observe which area of the side wall of the electrical connector 10 is leaking electricity, so as to facilitate the application of insulating materials such as paint on the side wall of the electrical connector 10 and facilitate the maintenance of the side wall of the electrical connector 10.

[0039] Please refer to Figure 1 and Figure 2 , in this embodiment, two limiting plates 9 are fixedly connected to the upper end of the inspection table 1. The two sides of the storage battery 7 are respectively in contact with one end of the two limiting plates 9 close to each other. The upper end of the storage battery 7 is higher than the upper end of the limiting plates 9. The storage battery 7 is laterally positioned by the limiting plates 9 to ensure that the position of the storage battery 7 is fixed and does not shift during the detection process.

[0040] Please refer to Figure 1 and Figure 5 , in this embodiment, the part of the inner wall of the insulating cylinder 81 except the conductive layer 86 is made of insulating material. The upper end of the insulating cylinder 81 is higher than the upper end of the electrical connector 10. The non-conductive layer 86 area of the insulating cylinder 81 is made of insulating material, which can avoid mis-conduction during detection and ensure the uniqueness of the conductivity detection between the conductive layer 86 and the side wall of the electrical connector 10. The upper end of the insulating cylinder 81 is higher than the electrical connector 10, which can effectively cover the top of the electrical connector 10 and cooperate with the insulating ring 11 at the lower end to form a closed detection space, which can prevent external impurities or conductors from interfering with the detection results.

[0041] Please refer to Figure 1 and Figure 2 In this embodiment, the display component 3 includes a bracket 31 and a display screen 32; a bracket 31 is fixedly connected to the side end of the test bench 1, and a display screen 32 is fixedly connected to the upper end of the bracket 31. The display screen 32 is arranged on the side of the test bench 1 through the bracket 31, which is convenient for the operator to directly read the test data such as internal resistance and insulation performance during the test, facilitating human-computer interaction and not occupying the test space above the test bench 1.

[0042] Please refer to Figure 1 and Figure 7 In this embodiment, the internal resistance test mechanism includes a bearing plate 41, a voltmeter 42, an ammeter 43, a support box 44, a variable resistor 45 and a fixed resistor 46; a bearing plate 41 is fixedly connected to one end of the first moving frame 4 close to the moving mechanism 6, a voltmeter 42 and an ammeter 43 are placed on the upper end of the bearing plate 41, a fixed resistor 46 is placed on the upper end of the first moving frame 4, a support box 44 is fixedly connected to the lower end of the bearing plate 41, and a variable resistor 45 is placed inside the support box 44. The voltmeter 42, ammeter 43, variable resistor 45 and fixed resistor 46 are integrated on the bearing plate 41 and the support box 44 of the first moving frame 4 to form a complete equivalent resistance method detection circuit. By moving the first moving frame 4, the power connection head 10 of the storage battery 7 can be quickly connected, realizing the on-line internal resistance detection without disassembling the battery, with a compact structure and concentrated functions.

[0043] Please refer to Figure 1 、 Figure 5 and Figure 7 In this embodiment, a camera 47 is fixedly connected to one end of the first moving frame 4 away from the moving mechanism 6. The camera 47 can take pictures of the position of the power connection head 10 at the upper end of the storage battery 7 in real time and can conveniently observe the red light 85 lighting up.

[0044] Please refer to Figure 1 and Figure 8 In this embodiment, two first fixing blocks 14 are fixedly connected to both sides of the upper end of the test bench 1. One end of the two first fixing blocks 14 on the same side close to each other is commonly fixedly connected to a first limiting column 15. One end of the first moving frame 4 close to the moving mechanism 6 is fixedly connected through a limiting cylinder in a penetrating manner. The inner wall of the limiting cylinder fits with the side wall of the first limiting column 15. The cooperation of the first limiting column 15 and the limiting cylinder provides guiding and limiting effects for the movement of the first moving frame 4, ensuring that the first moving frame 4 moves in a straight line when moving horizontally and avoiding shaking or deviation.

[0045] Please refer to Figure 1 and Figure 9, in this embodiment, two second fixing blocks 16 are fixedly connected to one side of the detection table 1. Two second limiting columns 17 are fixedly connected to the ends of the two second fixing blocks 16 close to each other. The second moving frame 5 is slidably sleeved on the side walls of the two second limiting columns 17. The two second limiting columns 17 provide sliding support for the second moving frame 5, so that the second moving frame 5 keeps stable when driving the moving mechanism 6 to move.

[0046] Working principle: During use, the storage battery 7 is placed on the belt conveyor 2. The two sides of the storage battery 7 are attached to the two limiting plates 9 at the upper end of the detection table 1 to achieve lateral positioning, ensuring that the position is fixed and does not shift;

[0047] Next, manually move the first moving frame 4. The first moving frame 4 slides along the first limiting column 15 at the upper end of the detection table 1 through the limiting cylinder at the end close to the moving mechanism 6. After moving to a suitable position, the camera 47 at the end of the first moving frame 4 away from the moving mechanism 6 assists in aligning with the power connection head 10 at the upper end of the storage battery 7. Then, manually insert the conductive plug 12 into the inner wall of the power connection head 10. The insulating rod 13 at the upper end of the conductive plug 12 is convenient for operation and prevents electric shock. At this time, the ammeter in the internal resistance testing mechanism is connected through the wire connection of the existing technology. First, form a closed loop with the fixed-value resistor 46, the voltmeter 42, the ammeter 43 in the internal resistance testing mechanism and the storage battery 7, and measure the voltage and current when the storage battery 7 is connected;

[0048] Subsequently, replace the storage battery 7 with the adjustable resistor 45 and connect it to the same circuit. Adjust the resistance value of the adjustable resistor 45 so that the voltage and current displayed by the voltmeter 42 and the ammeter 43 are the same as those when measuring the storage battery 7. At this time, the resistance value of the adjustable resistor 45 is the internal resistance of the storage battery 7, realizing the internal resistance detection. The detection data is displayed on the display screen 32 on the side support 31 of the detection table 1;

[0049] After the internal resistance test is completed, start the belt conveyor 2 to move the storage battery 7. Manually move the second moving frame 5. The second moving frame 5 slides along the two second limiting columns 17 on one side of the detection table 1 to adjust the position of the moving mechanism 6, so that the rack 64 on the connecting frame 62 at the lower end of the output shaft of the electric cylinder 61 meshes with the toothed ring 82 of the insulating cylinder 81 on the upper part of the side wall of the power connection head 10;

[0050] During this process, the electric cylinder 61 is turned on to lower the rack 64 to an appropriate height, and then the rodless cylinder 63 is turned on. The moving end of the rodless cylinder 63 drives the rack 64 to move horizontally. The rack 64 drives the toothed ring 82 to rotate, thereby driving the insulating cylinder 81 to rotate. The lower end of the insulating cylinder 81 fits with the insulating ring 11 on the lower part of the side wall of the electrical connection head 10 to form a closed detection area. The conductive layer 86 on the inner wall of the insulating cylinder 81 contacts the side wall of the electrical connection head 10 during rotation. If there is abnormal conductivity on the side wall of the electrical connection head 10, the control circuit board in the control box 83 triggers the red light 85 at the upper end of the support block 84 to light up, indicating the leakage area, which proves that there is leakage in the upper part of the side wall of the electrical connection head 10, facilitating the maintenance of the side wall of the electrical connection head 10 by the staff.

Claims

1. An intelligent DC panel with integrated battery internal resistance and system insulation detection functions, comprising a detection platform (1); characterized in that: A belt conveyor (2) is arranged at the upper end of the test bench (1), a storage battery (7) is placed at the upper end of the belt conveyor (2), a first movable frame (4) and a second movable frame (5) are arranged above the test bench (1), an internal resistance test mechanism is arranged on the first movable frame (4), and a movable mechanism (6) is installed on the second movable frame (5); Two electrical connections (10) are provided at the upper end of the storage battery (7); an insulating ring (11) is fixedly connected to the lower part of the side wall of the electrical connection head (10); a conductive plug (12) is inserted into the inner wall of the electrical connection head (10); and an insulating rod (13) is fixedly connected to the upper end of the conductive plug (12); An electricity measuring mechanism (8) is provided on the upper part of the side wall of the electrical connection head (10), and the moving mechanism (6) is adapted to the electricity measuring mechanism (8); The moving mechanism (6) comprises an electric cylinder (61), a connecting frame (62), a rodless cylinder (63) and a rack (64); the electric cylinder (61) is mounted on the second moving frame (5); the lower end of the output shaft of the electric cylinder (61) is fixedly connected to the connecting frame (62); the rodless cylinder (63) is fixedly connected to the connecting frame (62); and the moving end of the rodless cylinder (63) is fixedly connected to the rack (64); An insulating tube (81) is sleeved on the upper part of the side wall of the electrical connector (10), the lower end of the insulating tube (81) is fitted with the upper end of the insulating ring (11), a toothed ring (82) is fixedly connected to the side wall of the insulating tube (81), a control box (83) and a support block (84) are fixedly connected to the upper end of the insulating tube (81), a control circuit board and a lithium battery are arranged in the control box (83), a red light (85) is fixedly connected to the upper end of the support block (84), a conductive layer (86) is arranged on the inner wall of the insulating tube (81), and the conductive layer (86) is located directly below the inner side of the support block (84), and the toothed ring (82) and the rack (64) are meshed with each other.

2. The intelligent DC panel with integrated battery internal resistance and system insulation detection functions according to claim 1 is characterized in that: Two limit plates (9) are fixedly connected to the upper end of the testing platform (1), and two sides of the storage battery (7) are respectively in contact with the ends of the two limit plates (9) that are close to each other, and the upper end of the storage battery (7) is higher than the upper end of the limit plates (9).

3. The intelligent DC panel with integrated battery internal resistance and system insulation detection functions according to claim 1 is characterized in that: The inner wall of the insulating tube (81) except for the conductive layer (86) is made of insulating material, and the upper end of the insulating tube (81) is higher than the upper end of the electrical connector (10).

4. The intelligent DC panel with integrated battery internal resistance and system insulation detection functions according to claim 1 is characterized in that: The display assembly (3) comprises a bracket (31) and a display screen (32); the bracket (31) is fixedly connected to the side end of the detection platform (1), and the display screen (32) is fixedly connected to the upper end of the bracket (31).

5. The intelligent DC panel with integrated battery internal resistance and system insulation detection functions according to claim 1 is characterized in that: The internal resistance testing mechanism comprises a bearing plate (41), a voltmeter (42), an ammeter (43), a support box (44), an adjustable resistor (45) and a fixed value resistor (46); the bearing plate (41) is fixedly connected to one end of the first moving frame (4) close to the moving mechanism (6); the voltmeter (42) and the ammeter (43) are placed on the upper end of the bearing plate (41); the fixed value resistor (46) is placed on the upper end of the first moving frame (4); the support box (44) is fixedly connected to the lower end of the bearing plate (41); and the adjustable resistor (45) is placed inside the support box (44).

6. The intelligent DC panel with integrated battery internal resistance and system insulation detection functions according to claim 1 is characterized in that: A camera (47) is fixedly connected to one end of the first movable frame (4) away from the movable mechanism (6).

7. The intelligent DC panel with integrated battery internal resistance and system insulation detection functions according to claim 1 is characterized in that: Two first fixed blocks (14) are fixedly connected to the edges of both sides of the upper end of the detection table (1); the ends of the two first fixed blocks (14) on the same side close to each other are fixedly connected to a first limiting column (15); the end of the first movable frame (4) close to the movable mechanism (6) is fixedly connected to a limiting cylinder in a penetrating manner; the inner wall of the limiting cylinder is in contact with the side wall of the first limiting column (15).

8. The intelligent DC panel with integrated battery internal resistance and system insulation detection functions according to claim 1 is characterized in that: Two second fixed blocks (16) are fixedly connected to one side of the detection platform (1); ends of the two second fixed blocks (16) close to each other are commonly fixedly connected to two second limiting columns (17); and the second movable frame (5) is slidably sleeved on the side walls of the two second limiting columns (17).

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