Detection device for automobile power battery

Abstract

The invention relates to the technical field of battery detection, and discloses an automobile power battery detection device, which comprises a water tank with an open top, the top of the water tank is fixedly connected with a toughened glass cover with an open front surface, the front surface of the toughened glass cover is provided with a cabinet door, and the top of the water tank is provided with a bearing assembly for bearing a battery body. And a detection assembly for detecting the battery body at the top of the bearing assembly is arranged in the tempered glass cover. According to the detection device for the automobile power battery, the bearing plate can be adjusted front and back through the driving piece, detection work in different modes is met, a jacking piece in the detection assembly is arranged, a pressure detection piece and a puncture needle can be driven up and down, and the pressure detection piece and the puncture needle move downwards, so that the detection efficiency is improved. The pressure detection work and the puncture detection work can be carried out on the battery body at the top of the bearing plate, the detection function of multiple modes is achieved, and the functionality and the practicability of the detection equipment are improved.

Description

Technical Field

[0001] The present invention relates to the technical field of battery detection, and in particular to a detection device for an automobile power battery. Background Art

[0002] The power battery is the power source that provides the power source for new energy vehicles. After the power battery is produced, it is generally necessary to conduct quality inspection. The Chinese invention patent with the publication number CN118533658A discloses a detection device for testing automotive power batteries. By setting a driving mechanism to drive the extrusion assembly to rise and fall, the extrusion assembly can meet the downward extrusion test of multiple automotive power batteries at a time through the cooperation of the linkage assembly, and multiple batteries can be tested at a time. With the cooperation of the driving mechanism, the lifting assembly and the smoke inlet assembly, the smoke generated by the combustion of the automotive power battery during the test can be absorbed, and the smoke can be treated through the smoke treatment pool and the smoke adsorbent inside it. At the same time, when the automotive power battery burns, the automotive power battery can be pulled into the fire extinguishing pool and the cooling water inside it for fire extinguishing. The device integrates multiple functions in one, has high efficiency in battery testing, can reduce the harm of smoke generated by battery combustion to personnel, can avoid battery explosion and harm to personnel, and can also extinguish the battery fire to prevent the battery from continuing to burn.

[0003] In the related technology, the existing power batteries include temperature testing, mechanical testing, external environment simulation testing, battery performance testing, etc.; mechanical testing includes battery extrusion testing and puncture testing. The existing power battery testing equipment usually only has a single detection method. For example, the above-mentioned patent can perform extrusion testing on multiple power batteries at the same time, which improves the detection efficiency, but lacks the function of puncture detection. As a result, when performing puncture detection, additional puncture detection equipment is required to perform the detection operation, which increases the detection cost of the power battery. Summary of the invention

[0004] 1. Technical issues to be resolved In view of the deficiencies in the prior art, the present invention provides a detection device for an automobile power battery. By setting a supporting plate in a supporting assembly, the device is used to support a battery body to be detected, thereby improving the stability of subsequent detection. By setting a driving member, the supporting plate can be adjusted forward and backward to meet different types of detection work. By setting a lifting member in the detection assembly, the pressure detection member and the puncture needle can be driven up and down. By the downward movement of the pressure detection member and the puncture needle, the battery body on the top of the supporting plate can be subjected to pressure detection and puncture detection. The device has multiple detection functions, improves the functionality and practicality of the detection equipment, and solves the problem that the existing detection equipment can usually only perform unilateral detection on the power battery during detection work and lacks multiple detection functions, thereby reducing the use effect of the detection equipment.

[0005] (II) Technical solution To achieve the above-mentioned purpose, the present invention provides the following technical solutions: a detection device for an automobile power battery, comprising a water tank with an open top, a tempered glass cover with an open front fixedly connected to the top of the water tank, and a cabinet door is provided on the front of the tempered glass cover, a supporting assembly for supporting a battery body is provided on the top of the water tank, and a detection assembly for detecting the battery body on the top of the supporting assembly is provided inside the tempered glass cover; The supporting assembly includes a supporting plate for supporting the battery body and a driving member for driving the supporting plate forward and backward; The detection assembly comprises a pressure detection member for performing pressure detection on the battery body, a puncture needle for performing puncture detection on the battery body, and a lifting member for driving the pressure detection member and the puncture needle up and down.

[0006] Preferably, the top and bottom of the back side of the water tank are respectively fixedly connected with a three-way pipe and a drain pipe, the two ends of the three-way pipe are respectively connected to the external smoke purification mechanism and water injection mechanism, and a switch valve is installed on the drain pipe.

[0007] Preferably, the lifting member comprises a lifting frame slidably connected to the top of the inner wall of the tempered glass cover through a guide rod and a hydraulic telescopic rod for driving the lifting frame up and down, the hydraulic telescopic rod is embedded in the top of the tempered glass cover, and the bottom end of the hydraulic telescopic rod is fixed to the top of the lifting frame; The puncture needle is fixed to the bottom of the lifting frame.

[0008] Preferably, the pressure detection component comprises a transmission plate fixed to the bottom of the jacking frame, an upper pressure plate is fixedly connected to the bottom of the transmission plate, and a first pressure sensor is arranged on the upper pressure plate.

[0009] Preferably, both sides of the transmission plate are hinged with inclined transmission frames, the bottom ends of the two transmission frames are hinged with sliding frames, the opposite sides of the two sliding frames are fixedly connected with side pressure plates through connecting frames, second pressure sensors are installed on the two side pressure plates, the bottoms of the two sliding frames are slidably connected with guide plates, and the two guide plates are respectively fixed on both sides of the water tank.

[0010] Preferably, the supporting plate member includes a hollow U-shaped supporting plate, the interior of the U-shaped supporting plate is connected to a pad via a rotating shaft, arc-shaped puncture holes are provided on opposite sides of the two pads, and a safety member is provided at the bottom of the U-shaped supporting plate for limiting the two pads in a horizontal state.

[0011] Preferably, the safety member comprises locking members arranged on the front and back of the U-shaped supporting plate, a safety rope is installed between the two locking members, and the bottoms of the two pads are fixedly connected to two limiting plates, and limiting holes are provided inside the two sets of limiting plates; The locking member includes a sleeve fixed on the U-shaped supporting plate, the interior of the sleeve is slidably connected with a locking plate for inserting into two overlapping limit plates, one side of the locking plate is threadedly connected with a mounting tube, one end of the safety rope is connected to the locking plate through the mounting tube, and the outer side of the sleeve is fixedly connected with a spring for squeezing the locking plate.

[0012] Preferably, the driving member comprises a sliding rod fixed inside the water tank and a threaded rod rotatably connected to the inside of the water tank, and the U-shaped supporting plate is slidably connected to the outer surface of the sliding rod through a sliding block; The outer surface of the threaded rod is threadedly connected with a threaded block, and the threaded block is fixedly connected to the bottom of the U-shaped supporting plate. The back of the water tank is fixedly connected with a motor for driving the threaded rod to rotate forward and reverse.

[0013] (III) Beneficial effects Compared with the prior art, the present invention provides a detection device for an automobile power battery, which has the following beneficial effects: 2. The present invention can lock the overlapping limit plates at the bottom of the two pads through the provision of two locking members, thereby ensuring the stability of the horizontal state of the two pads and improving the stability during subsequent inspections. The two locking members are connected by a safety rope so that when an unqualified battery body is inspected, the safety rope can be melted by the high temperature or open flame emitted by the battery body, causing the two locking members to automatically shrink and lose the lock on the two pads. With the help of the gravity of the battery body itself, the battery body can fall into the water tank for protective treatment. It has good automatic protection function and does not require an additional electric drive mechanism for driving and detection, thereby improving the safety during the detection process.

[0014] 3. The present invention drives the support plate to adjust forward and backward by driving the threaded rod to rotate forward and backward through a motor, thereby facilitating the position adjustment of the battery body to be tested, satisfying the puncture detection by the puncture needle and the extrusion detection by the pressure detection component, further improving the diversity of detection, and through the setting of the sliding rod, it is convenient to improve the smoothness of the front and rear adjustment of the support plate, thereby improving the effectiveness of the subsequent battery body detection. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a structural schematic diagram of the present invention; Figure 2 It is a rear view of the structure of the present invention; Figure 3It is a structural cross-sectional view of the present invention; Figure 4 For the present invention Figure 3 Schematic diagram of the combination of the middle support component and the detection component; Figure 5 For the present invention Figure 4 A rear view of the combination of the middle support component and the detection component; Figure 6 For the present invention Figure 5 Schematic diagram of the structure of the detection component; Figure 7 For the present invention Figure 6 Structural schematic diagram of the middle lifting member; Figure 8 For the present invention Figure 4 A schematic diagram of the structure of the middle support assembly; Fig. 9 For the present invention Figure 8 A bottom view of the structure of the middle support assembly; Fig.10 For the present invention Fig. 9 Schematic diagram of the disassembly of the middle supporting plate; Fig.11 For the present invention Fig.10 Bottom view of the combination of the middle pad and the safety piece; Fig.12 For the present invention Fig.11 Schematic diagram of the disassembly of the insurance parts.

[0016] In the figure: 1. Water tank; 2. Tempered glass cover; 3. Cabinet door; 4. Battery body; 5. Switch valve; 6. Three-way pipe; 7. Drain pipe; 8. Support components; 81. Supporting plate; 811. U-shaped supporting plate; 812. Rotating shaft; 813. Backing plate; 814. Puncture hole; 815, safety piece; 8151, safety rope; 8152, limit plate; 8153, sleeve plate; 8154, locking plate; 8155, installation tube; 8156, spring; 82, driving member; 821, sliding rod; 822, threaded rod; 823, motor; 9. Detection component; 91. Puncture needle; 92, pressure detection member; 921, transmission plate; 922, upper pressure plate; 923, first pressure sensor; 924, transmission frame; 925, sliding frame; 926, side pressure plate; 927, second pressure sensor; 928, guide plate; 93. Lifting piece; 931. Guide rod; 932. Lifting frame; 933. Hydraulic telescopic rod. DETAILED DESCRIPTION

[0017] 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.

[0018] Embodiment 1: See attached Figure 1-12 A detection device for a vehicle power battery comprises a water tank 1 with an open top, a tempered glass cover 2 with an open front is fixedly connected to the top of the water tank 1, and a cabinet door 3 is arranged on the front of the tempered glass cover 2, a supporting assembly 8 for supporting a battery body 4 is arranged on the top of the water tank 1, and a detection assembly 9 for detecting the battery body 4 on the top of the supporting assembly 8 is arranged inside the tempered glass cover 2; By setting the supporting assembly 8, the power battery to be tested can be supported, and the power battery in the supporting process can be tested by the testing assembly 9. By setting the tempered glass cover 2, it is convenient for the staff to intuitively collect the data of the testing process, thereby improving the use effect of the testing equipment. The supporting assembly 8 includes a supporting plate 81 for supporting the battery body 4 and a driving member 82 for driving the supporting plate 81 forward and backward; The supporting plate 81 in the supporting assembly 8 is used to support the battery body 4 to be tested, thereby improving the stability of subsequent testing. The supporting plate 81 can be adjusted forward and backward through the setting of the driving member 82 to meet different testing methods. The detection assembly 9 includes a pressure detection member 92 for performing pressure detection on the battery body 4, a puncture needle 91 for performing puncture detection on the battery body 4, and a lifting member 93 for driving the pressure detection member 92 and the puncture needle 91 up and down; By setting the lifting member 93 in the detection component 9, the pressure detection member 92 and the puncture needle 91 can be driven up and down. Through the downward movement of the pressure detection member 92 and the puncture needle 91, the battery body 4 on the top of the supporting plate 81 can be pressure detected and punctured. It has a variety of detection functions, improves the functionality and practicality of the detection equipment, and solves the problem that the existing detection equipment can usually only perform unilateral detection on the power battery during the detection work, lacks a variety of detection functions, and thus reduces the use effect of the detection equipment.

[0019] See attached Figure 2The top and bottom of the back of the water tank 1 are respectively fixedly connected with a three-way pipe 6 and a drain pipe 7, the two ends of the three-way pipe 6 are respectively connected to the external smoke purification mechanism and the water injection mechanism, and a switch valve 5 is installed on the drain pipe 7; The drain pipe 7 is provided to discharge sewage inside the water tank 1, and the three-way pipe 6 is provided to not only facilitate the injection of water into the water tank 1, but also facilitate the extraction and purification of dense smoke during the detection process, thereby further improving the safety of the detection process.

[0020] See attached Figures 4 to 7 The lifting member 93 includes a lifting frame 932 slidably connected to the top of the inner wall of the tempered glass cover 2 through a guide rod 931 and a hydraulic telescopic rod 933 for driving the lifting frame 932 up and down. The hydraulic telescopic rod 933 is embedded in the top of the tempered glass cover 2, and the bottom end of the hydraulic telescopic rod 933 is fixed to the top of the lifting frame 932; The hydraulic telescopic rod 933 is connected to the external power supply and control switch, and is used to drive the lifting frame 932 to move up and down, and then can drive the puncture needle 91 and the pressure detection member 92 to move up and down, so as to form the puncture detection and pressure detection work of the battery body 4 on the supporting plate 81; the setting of the guide rod 931 is used to improve the smoothness of the up and down movement of the lifting frame 932; The puncture needle 91 is fixed to the bottom of the lifting frame 932; By fixing the puncture needle 91 to the bottom of the lifting frame 932 , the lifting frame 932 can move up and down, and the puncture needle 91 can be moved up and down, thereby performing a puncture detection operation on the battery body 4 .

[0021] See attached Figure 6 The pressure detection member 92 includes a transmission plate 921 fixed to the bottom of the lifting frame 932, an upper pressure plate 922 is fixedly connected to the bottom of the transmission plate 921, and a first pressure sensor 923 is provided on the upper pressure plate 922; The transmission plate 921 is fixedly connected to the lifting frame 932, so that when the lifting frame 932 moves up and down, it can synchronously drive the transmission plate 921 to move up and down, and then drive the upper pressure plate 922 to move up and down, forming a pressure detection work of the vertical trajectory of the battery body 4. The vertical pressure is detected by setting the first pressure sensor 923.

[0022] See attached Figure 6 , both sides of the transmission plate 921 are hinged with inclined transmission frames 924, the bottom ends of the two transmission frames 924 are hinged with sliding frames 925, the opposite sides of the two sliding frames 925 are fixedly connected with side pressure plates 926 through connecting frames, and the two side pressure plates 926 are installed with second pressure sensors 927, and the bottoms of the two sliding frames 925 are slidably connected with guide plates 928, and the two guide plates 928 are respectively fixed on the two sides of the water tank 1; Through the continuous rise of the transmission plate 921, the two inclined transmission frames 924 can be driven to move in a fan shape, and then the two sliding frames 925 can be driven to move on the top of the two guide plates 928, and then the two side pressure plates 926 can be driven to move in relative directions. Through the relative movement of the two side pressure plates 926, the side of the battery body 4 can be extrusion detected, and the pressure value of the pressure measurement is detected by the second pressure sensor 927, which effectively combines the horizontal extrusion detection and the vertical extrusion detection, and further improves the diversity and comprehensiveness of the extrusion detection.

[0023] See attached Figure 5 and Figures 8 to 12 The supporting plate 81 includes a hollow U-shaped supporting plate 811, the interior of the U-shaped supporting plate 811 is connected to a pad 813 through a rotating shaft 812, arc-shaped puncture holes 814 are provided on opposite sides of the two pads 813, and a safety member 815 for limiting the two pads 813 in a horizontal state is provided at the bottom of the U-shaped supporting plate 811; The two pads 813 are rotatably installed on the top of the U-shaped supporting plate 811 using the rotating shaft 812, and the two pads 813 in the horizontal state are limited and locked in cooperation with the safety piece 815, thereby ensuring the stability of the two pads 813 in supporting the battery body 4 and subsequent inspections. In addition, through the setting of the safety piece 815, the high temperature and open flame that appear when the battery body 4 is inspected can be handled, realizing its real-time protection function, thereby improving the safety of its power battery inspection.

[0024] Embodiment 2: Based on embodiment 1, the difference is that; See attached Fig.11 and Fig.12 The safety member 815 includes locking members arranged on the front and back of the U-shaped supporting plate 811, a safety rope 8151 is installed between the two locking members, and the bottoms of the two pads 813 are fixedly connected to two limiting plates 8152, and the insides of the two sets of limiting plates 8152 are provided with limiting holes; By setting two locking members, the overlapping limit plates 8152 at the bottom of the two pads 813 can be locked, thereby ensuring the stability of the horizontal state of the two pads 813 and improving the stability during subsequent testing; The two locking members are connected by a safety rope 8151, so that when an unqualified battery body 4 is tested, the safety rope 8151 is melted by the high temperature or open flame emitted by the battery body 4, so that the two locking members automatically shrink and lose the locking of the two pads 813. With the gravity of the battery body 4 itself, the battery body 4 can fall into the water tank 1 for protection treatment. It has a good automatic protection function and does not need to set up an additional electric drive mechanism for driving and testing, which further improves the safety of the testing process; The locking member includes a sleeve plate 8153 fixed on the U-shaped supporting plate 811, a locking plate 8154 for inserting into the two overlapping limiting plates 8152 is slidably connected inside the sleeve plate 8153, a mounting tube 8155 is threadedly connected to one side of the locking plate 8154, one end of the safety rope 8151 is connected to the locking plate 8154 through the mounting tube 8155, and a spring 8156 for squeezing the locking plate 8154 is fixedly connected to the outer side of the sleeve plate 8153; By inserting the locking plates 8154 in the two locking members into the two sets of overlapping limiting plates 8152, the two pads 813 can be locked in a horizontal state to ensure the stability of the battery body 4 during support and detection. The two ends of the safety rope 8151 are installed in the locking plates 8154 in the two locking members through the installation tube 8155 to ensure the stability of the locking plates 8154 inserted into the limiting plates 8152. When abnormally high temperature or open flame occurs on the battery body 4 on the top of the pad 813 during the detection process, the high temperature and open flame can fuse the safety rope 8151, and the elastic squeezing of the spring 8156 in the two locking parts can make the two locking plates 8154 move in separate directions, and then move out from the two sets of overlapping limit plates 8152. With the gravity of the battery body 4 itself, the two pads 813 can be unfolded downward, so that the battery body 4 enters the water tank 1 for protection treatment, and has automatic and real-time safety protection processing functions.

[0025] Embodiment 3: Based on embodiment 1, the difference is that; See attached Figure 8 and Fig. 9 The driving member 82 includes a sliding rod 821 fixed to the inside of the water tank 1 and a threaded rod 822 rotatably connected to the inside of the water tank 1, and the U-shaped supporting plate 811 is slidably connected to the outer surface of the sliding rod 821 through a sliding block; The setting of the sliding rod 821 facilitates the smoothness of the front and rear adjustment of the supporting plate 81, thereby improving the effectiveness of the subsequent detection of the battery body 4; The outer surface of the threaded rod 822 is threadedly connected with a threaded block, and the threaded block is fixedly connected to the bottom of the U-shaped supporting plate 811, and the back of the water tank 1 is fixedly connected with a motor 823 for driving the threaded rod 822 to rotate forward and reverse; The motor 823 is connected to an external power source and a control switch. It is a forward and reverse motor and is configured using the connection method and coding method of the prior art. It is used to drive the threaded rod 822 to rotate forward and reverse. The rotation of the threaded rod 822 can drive the supporting plate 81 to adjust forward and backward, thereby facilitating the position adjustment of the battery body 4 to be tested, thereby satisfying the puncture detection by the puncture needle 91 and the extrusion detection by the pressure detection component 92, and further improving the diversity of detection.

[0026] It should be noted that the term "comprises" or any other variation thereof is intended to cover non-exclusive inclusion, so that a process, method, article, or device that includes a series of elements includes not only those elements, but also includes other elements that are not explicitly listed, or also includes elements inherent to such process, method, article, or device. In the absence of further restrictions, an element defined by the sentence "comprises a ..." does not exclude the presence of other identical elements in the process, method, article, or device that includes the element.

[0027] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A detection device for an automobile power battery, comprising a water tank (1) with an open top, a tempered glass cover (2) with an open front fixedly connected to the top of the water tank (1), and a cabinet door (3) is provided on the front of the tempered glass cover (2), characterized in that: A supporting assembly (8) for supporting the battery body (4) is arranged on the top of the water tank (1), and a detection assembly (9) for detecting the battery body (4) on the top of the supporting assembly (8) is arranged inside the tempered glass cover (2); The supporting assembly (8) comprises a supporting plate (81) for supporting the battery body (4) and a driving member (82) for driving the supporting plate (81) forward and backward; The detection assembly (9) comprises a pressure detection member (92) for performing pressure detection on a battery body (4), a puncture needle (91) for performing puncture detection on the battery body (4), and a lifting member (93) for driving the pressure detection member (92) and the puncture needle (91) up and down.

2. The detection device for an automobile power battery according to claim 1, characterized in that: The top and bottom of the back side of the water tank (1) are respectively fixedly connected with a three-way pipe (6) and a drainage pipe (7), the two ends of the three-way pipe (6) are respectively connected to an external smoke purification mechanism and a water injection mechanism, and a switch valve (5) is installed on the drainage pipe (7).

3. The detection device for an automobile power battery according to claim 1, characterized in that: The lifting member (93) comprises a lifting frame (932) slidably connected to the top of the inner wall of the tempered glass cover (2) via a guide rod (931) and a hydraulic telescopic rod (933) used to drive the lifting frame (932) up and down, the hydraulic telescopic rod (933) being embedded in the top of the tempered glass cover (2), and the bottom end of the hydraulic telescopic rod (933) being fixed to the top of the lifting frame (932); The puncture needle (91) is fixed to the bottom of the lifting frame (932).

4. The detection device for an automobile power battery according to claim 3, characterized in that: The pressure detection component (92) comprises a transmission plate (921) fixed to the bottom of the lifting frame (932), an upper pressure plate (922) is fixedly connected to the bottom of the transmission plate (921), and a first pressure sensor (923) is provided on the upper pressure plate (922).

5. The detection device for an automobile power battery according to claim 4, characterized in that: Both sides of the transmission plate (921) are hingedly connected to inclined transmission frames (924); the bottom ends of the two transmission frames (924) are hingedly connected to sliding frames (925); opposite sides of the two sliding frames (925) are fixedly connected to side pressure plates (926) via connecting frames; second pressure sensors (927) are installed on the two side pressure plates (926); the bottoms of the two sliding frames (925) are slidably connected to guide plates (928); and the two guide plates (928) are respectively fixed to the two sides of the water tank (1).

6. The detection device for an automobile power battery according to claim 1, characterized in that: The support plate member (81) comprises a hollow U-shaped support plate (811), the interior of the U-shaped support plate (811) being transmission-connected to a pad (813) via a rotating shaft (812), arc-shaped puncture holes (814) being provided on opposite sides of the two pads (813), and a safety member (815) for limiting the position of the two pads (813) in a horizontal state being provided at the bottom of the U-shaped support plate (811).

7. The detection device for an automobile power battery according to claim 6, characterized in that: The safety member (815) comprises locking members arranged on the front and back of the U-shaped supporting plate (811), a safety rope (8151) is installed between the two locking members, and the bottoms of the two pads (813) are fixedly connected to two limiting plates (8152), and limiting holes are provided inside the two sets of limiting plates (8152); The locking member comprises a sleeve plate (8153) fixed on a U-shaped supporting plate (811); a locking plate (8154) is slidably connected inside the sleeve plate (8153) for inserting into two overlapping limit plates (8152); a mounting tube (8155) is threadedly connected to one side of the locking plate (8154); one end of the safety rope (8151) is connected to the locking plate (8154) via the mounting tube (8155); and a spring (8156) is fixedly connected to the outer side surface of the sleeve plate (8153) for compressing the locking plate (8154).

8. The detection device for an automobile power battery according to claim 6, characterized in that: The driving member (82) comprises a sliding rod (821) fixed inside the water tank (1) and a threaded rod (822) rotatably connected to the inside of the water tank (1); the U-shaped supporting plate (811) is slidably connected to the outer surface of the sliding rod (821) via a sliding block; The outer surface of the threaded rod (822) is threadedly connected to a threaded block, and the threaded block is fixedly connected to the bottom of the U-shaped supporting plate (811), and the back of the water tank (1) is fixedly connected to a motor (823) for driving the threaded rod (822) to rotate forward and reverse.

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