Tripping force test unit of circuit breaker

Abstract

The invention discloses a tripping force testing unit of a circuit breaker, and relates to the field of packaging machines, the tripping force testing unit comprises a rack and a conveying belt arranged on the rack, and the rack is further provided with a tripping testing mechanism located on one side of the conveying belt; the closing mechanism is located between the conveying belt and the tripping test mechanism; the feeding channel is arranged between the tripping test mechanism and the closing mechanism and is parallel to the conveying belt; the transfer mechanisms are arranged at the front end and the rear end of the feeding channel and used for transferring the circuit breakers on the conveying belt to the feeding channel and transferring the circuit breakers in the feeding channel to the conveying belt again; and the pushing mechanism is used for pushing the circuit breaker along the feeding channel and enabling the circuit breaker to pass through the closing mechanism and the tripping test mechanism in sequence. The device has the advantages of high detection efficiency, high detection precision and high automation degree.

Description

Technical Field

[0001] The invention relates to the field of packaging machines, and in particular to a tripping force testing unit of a circuit breaker. Background Art

[0002] Circuit breakers are protective electrical appliances. If their protection characteristics malfunction, it will affect the normal operation of the power distribution system and even endanger the safety of the system and power equipment. Therefore, product reliability is an important indicator of circuit breaker products. Therefore, during the production process of circuit breakers, it is necessary to test their performance in various aspects, such as on-off detection, tripping force detection, push rod force detection, opening and closing force detection, etc., to ensure that their reliability meets the requirements.

[0003] At present, in the production process of 1P small circuit breakers, the tripping force detection needs to be carried out manually or equipped with a single function test bench. During the detection process, the product needs to be transferred between the production line and the testing equipment, and the detection efficiency is low. The test data after the test is manually recorded and cannot be automatically summarized, and the degree of automation is low. Summary of the invention

[0004] In order to overcome the shortcomings of the background technology, the present invention provides a tripping force testing unit for a circuit breaker with high detection efficiency, high detection accuracy and high automation.

[0005] The technical solution adopted by the present invention is: a tripping force test unit of a circuit breaker, comprising a frame and a conveyor belt arranged on the frame, and the frame is also provided with: A tripping test mechanism, which is located on one side of the conveyor belt; A closing mechanism, which is located between the conveyor belt and the tripping test mechanism; A feeding channel, which is arranged between the tripping test mechanism and the closing mechanism and is arranged parallel to the conveyor belt; A transfer mechanism, which is arranged at the front and rear ends of the feeding channel and is used to transfer the circuit breaker on the conveyor belt to the feeding channel and to transfer the circuit breaker in the feeding channel back to the conveyor belt; The pushing mechanism is used to push the circuit breaker along the feeding channel and pass through the closing mechanism and the tripping test mechanism in sequence.

[0006] The closing mechanism comprises: A first base, which is fixedly mounted on the frame and is provided with a first power member; A first movable seat, which is slidably mounted on the first base and connected to the output end of the first power member; A first positioning seat, which is fixedly mounted on the first moving seat and is provided with a second power member; A push rod seat, which is slidably mounted on the first positioning seat and connected to the output end of the second power member; The moving directions of the first moving seat and the push rod seat are perpendicular to each other.

[0007] A detection component for detecting whether the circuit breaker is closed successfully is provided below the first movable seat, and the detection component includes: A third power member, which is fixedly mounted on the lower surface of the first moving seat; A probe seat connected to the output end of the third power member and corresponding to two sides of the circuit breaker; A probe head is arranged in the probe seat; and avoidance holes for avoiding the probe seat are arranged on both side walls of the feeding channel.

[0008] A plurality of spaced positioning blocks extend from the front end of the first positioning seat, a plurality of spaced pushing blocks extend from the front end of the push rod seat, and the positioning blocks, pushing blocks and the probe seat are located on the same straight line.

[0009] The tripping test mechanism comprises: A fixing seat, which is installed on the frame; A second mounting base, which is mounted on the frame and located behind the fixing base; A rotating bracket, which is rotatably mounted between the fixing seat and the second mounting seat; a fifth power member, which is mounted on the second mounting seat and is used to drive the rotating bracket to rotate; A test assembly mounted on the rotating bracket; A notch corresponding to the fixing seat is provided at a position of the feeding channel corresponding to the tripping test mechanism. The test assembly has a first action of being inserted into the circuit breaker and a second action of following the rotation of the rotating bracket to realize the tripping test.

[0010] The output end of the fifth power member is located on one side of the rotating bracket and the two are in contact fit, and the fixing seat is provided with a reset component on the other side of the rotating bracket that is in elastic contact fit with the rotating bracket; The output end of the fifth power member is provided with a swing arm and a roller rotatably installed at the end of the swing arm, and the roller is in rolling contact with the side wall of the rotating bracket. The reset assembly includes a support fixedly installed on the fixed seat and an elastic push rod elastically installed in the support, and one end of the elastic push rod extends out of the support and contacts with the side wall of the rotating bracket.

[0011] The test components include: a sixth power member, which is mounted on the rotating bracket; A pressure sensor fixedly connected to the output end of the sixth power member; A test pin and a pressure sensor are provided with a pin socket for connecting the two.

[0012] The fixing seat is provided with a bearing rotatably connected to the rotating bracket. The rotating bracket is provided with a through hole for the test pin to pass through. The through hole is arranged offset from the center of the bearing.

[0013] The transfer mechanism includes a feed assembly located at one end of the feed channel and a discharge assembly located at the other end of the feed channel; The feed assembly comprises: A first material blocking plate, which is arranged on the frame and located directly above the conveyor belt; A first rotating seat, which is arranged at the other side of the conveyor belt and corresponds to the first baffle plate; A first push rod component, which is located at one side of the conveyor belt and is used to push the circuit breaker onto the first rotating seat; A second push rod component is arranged on the frame and is used to push the circuit breaker on the first rotating seat into the feeding channel; The discharging assembly comprises: A plurality of second rotating seats, which are in the same straight line as the feeding channel; A plurality of third push rod components, which are arranged on one side of the second rotating seat and are used to push the circuit breaker onto the conveyor belt; The first rotating seat and the second rotating seat are respectively provided with mounting positions adapted to the thickness of the circuit breaker, and the mounting positions have a first state perpendicular to the conveyor belt and a second state rotated to be aligned with the feeding channel.

[0014] The pushing mechanism comprises: The fork frame has a plurality of positioning grooves arranged linearly at its lower end which are adapted to the upper end of the circuit breaker: A power assembly, which is arranged on the frame and has an output end connected to the shift fork frame; The shift fork frame is located directly above the feeding channel and is used to push the circuit breaker in the feeding channel forward step by step; the power assembly is used to realize the movement of the shift fork frame in the X-axis direction and the Z-axis direction.

[0015] The beneficial effects of the present invention are as follows: the technical solution delivers the circuit breaker on the conveyor belt into the feeding channel by the transfer mechanism, and then the pushing mechanism pushes the small circuit breaker in the feeding channel to the position just in front of the closing mechanism, the closing mechanism performs a closing operation on the small circuit breaker, and after the closing is completed, the tripping test mechanism performs a tripping force test on the small circuit breaker, and after the test is completed, the small circuit breaker is pushed to the transfer mechanism by the pushing mechanism, and then the transfer mechanism pushes the small circuit breaker back to the conveyor belt, which has the advantages of high detection efficiency, high detection accuracy and high degree of automation. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1The figure is a schematic structural diagram of a tripping force testing unit of a circuit breaker according to an embodiment of the present invention.

[0017] Figure 2 This is a schematic structural diagram of the tripping force test unit of the circuit breaker from another angle.

[0018] Figure 3 It is a schematic diagram of the structure of the feed component.

[0019] Figure 4 It is a schematic diagram of the structure of the tripping test mechanism and the closing mechanism.

[0020] Figure 5 It is a schematic diagram of the structure of the discharging component.

[0021] Figure 6 It is a schematic diagram of the split structure of the tripping test mechanism.

[0022] Figure 7 This is the front view of the trip test mechanism.

[0023] Figure 8 This is a schematic diagram of the structure of the transfer mechanism. DETAILED DESCRIPTION

[0024] The embodiments of the present invention are further described below in conjunction with the accompanying drawings: As shown in the figure, a tripping force test unit of a circuit breaker includes a frame 1 and a conveyor belt 2 arranged on the frame 1, and the frame 1 is also provided with: A tripping test mechanism 3, which is located on one side of the conveyor belt 2; A closing mechanism 4, which is located between the conveyor belt 2 and the tripping test mechanism 3; A feeding channel 6, which is arranged between the tripping test mechanism 3 and the closing mechanism 4 and is arranged parallel to the conveyor belt 2; A transfer mechanism 7, which is arranged at the front and rear ends of the feeding channel 6 and is used to transfer the circuit breaker on the conveyor belt 2 to the feeding channel 6 and to transfer the circuit breaker in the feeding channel 6 back to the conveyor belt 2; The pushing mechanism 8 is used to push the circuit breaker along the feeding channel 6 and pass through the closing mechanism 4 and the tripping test mechanism 3 in sequence. The technical solution is that the transfer mechanism sends the circuit breaker on the conveyor belt into the feeding channel, and then the pushing mechanism pushes the small circuit breaker in the feeding channel to the position just in front of the closing mechanism. The closing mechanism closes the small circuit breaker. After the closing is completed, the tripping test mechanism performs a tripping force test on the small circuit breaker. After the test is completed, it is pushed to the transfer mechanism by the pushing mechanism, and then the transfer mechanism pushes the small circuit breaker back to the conveyor belt. It has the advantages of high detection efficiency, high detection accuracy and high degree of automation.

[0025] The closing mechanism 4 comprises: A first base 41, which is fixedly mounted on the frame 1 and is provided with a first power member 42; A first movable seat 43, which is slidably mounted on the first base 41 and connected to the output end of the first power member 42; A first positioning seat 44, which is fixedly mounted on the first moving seat 43 and is provided with a second power member 46; A push rod seat 45, which is slidably mounted on the first positioning seat 44 and connected to the output end of the second power member 46; The moving directions of the first movable seat 43 and the push rod seat 45 are perpendicular to each other. The first power member and the second power member both adopt cylinders, oil cylinders or linear motors. The two can cooperate to realize the movement of the push rod seat in the X-axis direction and the Y-axis direction. The push rod seat can close the small circuit breaker. After the small circuit breaker is closed, it waits for subsequent conduction detection.

[0026] A detection component 9 for detecting whether the circuit breaker is closed successfully is provided below the first movable seat 43. The detection component 9 includes: A third power member 91, which is fixedly mounted on the lower surface of the first moving seat 43; A probe seat 92, which is connected to the output end of the third power member 91 and corresponds to two sides of the circuit breaker; A probe head 93 is provided in the probe seat 92; avoidance holes 61 for avoiding the probe seat 92 are provided on both side walls of the feeding channel 6. The entire detection assembly can move with the first movable seat 43, so that the probe seat has two actions of passing through the avoidance hole to enter the feeding channel and retreating and resetting. The rear end of the probe head is connected to a powered wire. When the probe seat enters the feeding channel, the probe head is driven by the third power component to be inserted into the jacks at both ends of the small circuit breaker to determine whether the small circuit breaker is turned on. If it is turned on, it proves that the circuit breaker is closed successfully. The third power component can be a finger cylinder.

[0027] A plurality of groups of spaced positioning blocks 47 are extended from the front end of the first positioning seat 44, and a plurality of groups of spaced pushing blocks 48 are extended from the front end of the push rod seat 45; there are two positioning blocks in each group, which correspond to the outer wall surfaces at the front and rear ends of the miniature circuit breaker respectively, and the positioning blocks are provided with chamfers to accurately position the miniature circuit breaker; the first power member drives the first positioning seat close to the circuit breaker so that the circuit breaker is embedded between the two positioning blocks. After positioning, the pushing blocks are just at the front and rear ends of the miniature circuit breaker operating handle, and then the pushing blocks are driven by the second power member to complete the closing operation. In this embodiment, the positioning blocks 47, the pushing blocks 48 and the probe seat 92 are located on the same straight line, which means that the positions of the three are corresponding to each other, and the three cooperate to complete the positioning, closing and detection work.

[0028] The tripping test mechanism 3 comprises: A fixing seat 33, which is installed on the frame 1; A second mounting base 34, which is mounted on the frame 1 and located behind the fixing base 33; A rotating bracket 35, which is rotatably mounted between the fixing seat 33 and the second mounting seat 34; A fifth power member 36, which is mounted on the second mounting seat 34 and is used to drive the rotating bracket 35 to rotate; A test assembly 37, which is mounted on the rotating bracket 35; A notch 62 corresponding to the fixing seat 33 is provided at a position of the feeding channel 6 corresponding to the tripping test mechanism 3. The test assembly 37 has a first action of being inserted into the circuit breaker and a second action of rotating following the rotating bracket 35 to realize the tripping test. The fixing seat is equivalent to the side wall of the feeding channel. The fixing seat and the inner wall of the feeding channel are respectively in contact with the outer wall surfaces on both sides of the circuit breaker. After the detection assembly confirms that the circuit breaker is turned on, the test assembly passes through the rotating bracket and the fixing seat and is inserted into the hole in the side wall of the small circuit breaker. The inside of the hole just corresponds to the tripping device of the small circuit breaker. The hole is arc-shaped. The fifth power member drives the rotating bracket to rotate, and the test assembly swings in an arc shape around the rotation center of the rotating bracket, and its trajectory just coincides with the hole in the side wall of the small circuit breaker.

[0029] The output end of the fifth power member 36 is located on one side of the rotating bracket 35 and the two are in contact fit. The fixing seat 33 is provided with a reset assembly 38 on the other side of the rotating bracket 35 and elastically contacts the rotating bracket 35. The output end of the fifth power member 36 is provided with a swing arm 361 and a roller 362 rotatably mounted on the end of the swing arm 361, the roller 362 rolling contacting with the side wall of the rotating bracket 35, the reset assembly 38 comprises a support 381 fixedly mounted on the fixed seat 33 and an elastic push rod 382 elastically mounted in the support 381, one end of the elastic push rod 382 extending out of the support 381 abuts against the side wall of the rotating bracket 35; the fifth power member adopts a rotary cylinder, the output end of which is a rotating shaft, the rotating shaft drives the swing arm to swing, the roller at the end of the swing arm rolling contacting with the side wall of the rotating bracket, the swing arm transmits the force to the rotating bracket, so that the test assembly inserted into the hole of the side wall of the circuit breaker swings around the rotation center of the rotating bracket, after the test is completed, the fifth power member reverses and resets, and the rotating bracket also reverses and resets under the elastic force of the elastic push rod.

[0030] The fifth power member and the reset assembly both have a limiting function. When the rotating bracket is driven by the fifth power member to rotate, the elastic push rod of the reset assembly always contacts the side wall of the rotating bracket. The reset assembly in this embodiment is tilted. When the rotating bracket rotates to a state perpendicular to the reset assembly, the elastic push rod no longer retracts but presses against the rotating bracket to play a limiting role. After the test is completed, the fifth power member reverses to cancel the force on the rotating bracket, and the rotating bracket also reverses and resets under the action of the reset component. When the rotating bracket rotates to a vertical state, it will contact the roller of the fifth power member, and the roller will limit the rotating bracket.

[0031] The test component 37 comprises: A sixth power member 371, which is mounted on the rotating bracket 35; A pressure sensor 372, which is fixedly connected to the output end of the sixth power member 371; A pin socket 374 is provided between the test pin 373 and the pressure sensor 372 to connect the two.

[0032] The fixed seat 33 is provided with a bearing 331 rotatably connected to the rotating bracket 35. The rotating bracket 35 is provided with a through hole 351 for the test pin 373 to pass through. The through hole 351 is set offset from the center of the bearing 331. The sixth power member adopts a cylinder, an oil cylinder or a linear motor, which drives the pressure sensor, the pin seat and the test pin to move linearly together. The test pin passes through the through hole on the rotating bracket, and then is inserted into the hole in the small circuit breaker and contacts the release. After that, the rotating bracket is driven to rotate by the fifth power member, and the test pin swings synchronously and drives the release in the small circuit breaker to operate. In this process, the torsional force received by the test pin will be transmitted to the pressure sensor, and the pressure sensor can detect the numerical value of the torsional force.

[0033] The transfer mechanism 7 includes a feed assembly located at one end of the feed channel 6 and a discharge assembly located at the other end of the feed channel 6; The feed assembly comprises: A first material blocking plate 71, which is arranged on the frame 1 and located directly above the conveyor belt 2; A first rotating seat 72, which is disposed at the other side of the conveyor belt 2 and corresponds to the first baffle plate 71; A first push rod component 73, which is located at one side of the conveyor belt 2 and is used to push the circuit breaker onto the first rotating seat 72; The second push rod component 74 is arranged on the frame 1 and is used to push the circuit breaker on the first rotating seat 72 into the feeding channel 6; the first push rod component adopts the structure of a cylinder and a push rod, the push rod is aligned with the installation position on the first rotating seat, and a small breaker on the conveyor belt is pushed into the installation position, and then the first rotating seat is rotated 90 degrees so that the installation position is aligned with the feeding channel. The second push rod component also adopts the structure of a cylinder and a push rod, and a linear module is further arranged under the cylinder and the push rod to drive the push rod and the cylinder to move toward the feeding channel. The push rod of the second push rod component is pushed out by the cylinder to make it contact one end of the circuit breaker, and then the linear module pushes the circuit breaker into the feeding channel through the push rod and makes the circuit breaker just below the pushing mechanism; The discharging assembly comprises: A plurality of second rotating seats 75, which are in the same straight line as the feeding channel 6; A plurality of third push rod components 76, which are arranged on one side of the second rotating seat 75 and are used to push the circuit breaker onto the conveyor belt 2; The first rotating seat 72 and the second rotating seat 75 are respectively provided with a mounting position 77 adapted to the thickness of the circuit breaker. The mounting position 77 has a first state perpendicular to the conveyor belt 2 and a second state rotated to be aligned with the feeding channel 6.

[0034] The structure of the third push rod component is the same as that of the first push rod component. In this embodiment, the rotation of the first rotating seat and the second rotating seat is driven by the rotating cylinder therebelow.

[0035] The pushing mechanism 8 comprises: The fork frame 81 has a plurality of positioning grooves 82 at its lower end which are adapted to the upper end of the circuit breaker and are arranged along a linear pattern: A power assembly 83, which is arranged on the frame 1 and has an output end connected to the fork frame 81; The fork frame 81 is located directly above the feeding channel 6 and is used to push the circuit breaker in the feeding channel 6 forward step by step; the power assembly 83 is used to realize the movement of the fork frame 81 in the X-axis direction and the Z-axis direction. As shown in the figure, the power assembly uses two cylinders to realize the movement of the fork frame 81 in the X-axis direction and the Z-axis direction. This structure is a prior art and will not be elaborated here. Each time the fork frame descends, the positioning groove will be sleeved on the circuit breaker, and then the power assembly drives the circuit breaker to move linearly along the feeding channel. Each small circuit breaker is pushed by the pushing mechanism to between the closing mechanism and the tripping test mechanism for closing operation and tripping test, and then pushed to the installation position of the second rotating seat by the fork frame.

[0036] In the description of the present invention, it should be noted that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first" and "second" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance.

[0037] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances. In addition, in the description of the present invention, unless otherwise specified, "plurality" means two or more.

[0038] Technical personnel should note that: Although the present invention has been described according to the above specific implementation methods, the inventive concept of the present invention is not limited to this invention, and any modification using the inventive concept will be included in the scope of protection of this patent.

Claims

1. A tripping force test unit for a circuit breaker, comprising a frame (1) and a conveyor belt (2) arranged on the frame (1), characterized in that: The frame (1) is also provided with: A tripping test mechanism (3), which is located on one side of the conveyor belt (2); A closing mechanism (4), which is located between the conveyor belt (2) and the tripping test mechanism (3); A feeding channel (6), which is arranged between the tripping test mechanism (3) and the closing mechanism (4) and is arranged parallel to the conveyor belt (2); A transfer mechanism (7) disposed at the front and rear ends of the feeding channel (6) and used to transfer the circuit breaker on the conveyor belt (2) to the feeding channel (6) and to transfer the circuit breaker in the feeding channel (6) back to the conveyor belt (2); A pushing mechanism (8) is used to push the circuit breaker along the feeding channel (6) and pass through the closing mechanism (4) and the tripping test mechanism (3) in sequence.

2. The tripping force testing unit of a circuit breaker according to claim 1, characterized in that: The closing mechanism (4) comprises: A first base (41) fixedly mounted on the frame (1) and provided with a first power member (42); A first movable seat (43) which is slidably mounted on the first base (41) and connected to an output end of the first power member (42); A first positioning seat (44) which is fixedly mounted on the first moving seat (43) and is provided with a second power member (46); A push rod seat (45) which is slidably mounted on the first positioning seat (44) and connected to the output end of the second power member (46); The moving directions of the first moving seat (43) and the push rod seat (45) are perpendicular to each other.

3. The tripping force testing unit of a circuit breaker according to claim 2, characterized in that: A detection component (9) for detecting whether the circuit breaker is closed successfully is provided below the first movable seat (43), and the detection component (9) comprises: a third power member (91) fixedly mounted on the lower surface of the first movable seat (43); A probe seat (92) connected to the output end of the third power member (91) and corresponding to positions on both sides of the circuit breaker; A probe head (93) is arranged in the probe seat (92); and avoidance holes (61) for avoiding the probe seat (92) are arranged on both side walls of the feeding channel (6).

4. The tripping force testing unit of a circuit breaker according to claim 2, characterized in that: A plurality of groups of spaced positioning blocks (47) extend from the front end of the first positioning seat (44), and a plurality of groups of spaced pushing blocks (48) extend from the front end of the push rod seat (45). The positioning blocks (47), the pushing blocks (48) and the probe seat (92) are located on the same straight line.

5. The tripping force testing unit of a circuit breaker according to claim 1, characterized in that: The tripping test mechanism (3) comprises: A fixing seat (33) mounted on the frame (1); A second mounting seat (34) mounted on the frame (1) and located behind the fixing seat (33); A rotating bracket (35) rotatably mounted between the fixing seat (33) and the second mounting seat (34); a fifth power member (36), mounted on the second mounting seat (34) and used for driving the rotating bracket (35) to rotate; A test assembly (37) mounted on the rotating bracket (35); A notch (62) corresponding to the fixing seat (33) is provided at a position of the feeding channel (6) corresponding to the tripping test mechanism (3), and the test assembly (37) has a first action of being inserted into the circuit breaker, and a second action of rotating following the rotating bracket (35) to realize a tripping test.

6. The tripping force testing unit of a circuit breaker according to claim 5, characterized in that: The output end of the fifth power member (36) is located on one side of the rotating bracket (35) and the two are in contact fit, and the fixing seat (33) is provided with a reset component (38) on the other side of the rotating bracket (35) and elastically contacts and fits with the rotating bracket (35); The output end of the fifth power member (36) is provided with a swing arm (361) and a roller (362) rotatably mounted on the end of the swing arm (361); the roller (362) is in rolling contact with the side wall of the rotating bracket (35); the reset assembly (38) comprises a support (381) fixedly mounted on the fixed seat (33) and an elastic push rod (382) elastically mounted in the support (381); one end of the elastic push rod (382) extending out of the support (381) is in contact with the side wall of the rotating bracket (35).

7. The tripping force testing unit of a circuit breaker according to claim 5, characterized in that: The test component (37) comprises: a sixth power member (371), mounted on the rotating bracket (35); A pressure sensor (372) fixedly connected to an output end of the sixth power member (371); A test pin (373) and a pressure sensor (372) are provided with a pin socket (374) connecting the two.

8. The tripping force testing unit of a circuit breaker according to claim 7, characterized in that: The fixing seat (33) is provided with a bearing (331) rotatably connected to the rotating bracket (35), and the rotating bracket (35) is provided with a through hole (351) for the test pin (373) to pass through, and the through hole (351) is arranged offset from the center of the bearing (331).

9. The tripping force testing unit of a circuit breaker according to claim 1, characterized in that: The transfer mechanism (7) comprises a feed assembly located at one end of the feed channel (6) and a discharge assembly located at the other end of the feed channel (6); The feed assembly comprises: A first material blocking plate (71), which is arranged on the frame (1) and is located directly above the conveyor belt (2); a first rotating seat (72), which is arranged on the other side of the conveyor belt (2) and corresponds to the first material blocking plate (71); A first push rod component (73), which is located on one side of the conveyor belt (2) and is used to push the circuit breaker onto the first rotating seat (72); A second push rod component (74) is disposed on the frame (1) and is used to push the circuit breaker on the first rotating seat (72) into the feeding channel (6); The discharging assembly comprises: A plurality of second rotating seats (75) which are located in the same straight line as the feeding channel (6); a plurality of third push rod components (76), which are arranged on one side of the second rotating seat (75) and are used to push the circuit breaker onto the conveyor belt (2); The first rotating seat (72) and the second rotating seat (75) are respectively provided with a mounting position (77) adapted to the thickness of the circuit breaker, and the mounting position (77) has a first state perpendicular to the conveyor belt (2) and a second state rotated to be aligned with the feeding channel (6).

10. The tripping force testing unit of a circuit breaker according to claim 1, characterized in that: The pushing mechanism (8) comprises: The shift fork frame (81) has a plurality of positioning grooves (82) at its lower end adapted to the upper end of the circuit breaker and arranged along a linear direction: A power assembly (83), which is arranged on the frame (1) and has an output end connected to the shift fork frame (81); The shift fork frame (81) is located directly above the feeding channel (6) and is used to push the circuit breaker in the feeding channel (6) to gradually move forward; the power assembly (83) is used to realize the movement of the shift fork frame (81) in the X-axis direction and the Z-axis direction.

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