A kind of fuel injection pump rack control test device based on stepper motor drive

Abstract

The utility model relates to hydraulic technology field discloses a kind of rack control test device of fuel injection pump based on stepper motor drive, including stepper motor, push rod assembly, reinforcing assembly and fuel injection pump, push rod assembly includes ball screw, push rod and guide cylinder, the power end of ball screw is fixedly connected with the output shaft of stepper motor, the resistance end of ball screw is fixedly connected with the first end of push rod, the guide cylinder is axially provided with the guide hole compatible with the push rod, the second end of push rod is stretched out guide cylinder by guide hole and is connected with the rack of fuel injection pump, the connecting position of the second end of push rod and the rack of fuel injection pump is also provided with reinforcing assembly for eliminating axial error, so that the push rod not only can be moved under the driving of stepper motor, but also can avoid displacement error generated by its radial swing, thereby solve the problem that test equipment in the prior art is difficult to guarantee the high-precision requirement of fuel injection pump rack test when servo motor is not used.

Description

Technical Field

[0001] This utility model relates to the field of fuel injection pump testing technology, and in particular to a fuel injection pump rack control test device based on stepper motor drive. Background Technology

[0002] The fuel injection pump is a core component of the internal combustion engine's fuel supply system. Its fuel quantity regulation accuracy directly affects the engine's power performance, fuel economy, and emissions. The displacement of the fuel injection pump rack is key to achieving fuel quantity regulation. Traditional testing devices often employ manual adjustment or hydraulic drive, which suffers from low control accuracy, slow response speed, and complex operation, making it difficult to meet the demands of high-precision, highly automated testing.

[0003] In existing technologies, some equipment uses servo motors for drive. However, due to the high cost of servo systems and the strict requirements for coaxiality of mechanical connections, the installation and debugging process is overly complex. Furthermore, the cumulative errors and assembly clearances in the connection mechanisms of the testing equipment itself can easily lead to a decrease in the accuracy of rack and pinion movement, severely affecting the reliability of test data. Therefore, existing equipment, without using servo motors, cannot guarantee the high precision requirements of fuel injection pump rack and pinion testing. Summary of the Invention

[0004] The purpose of this invention is to provide a stepper motor-driven fuel injection pump rack control test device, which solves the problem that in the prior art, the test equipment is difficult to guarantee the high precision requirements of the fuel injection pump rack test when a servo motor is not used.

[0005] To achieve the above objectives, the technical solution of this utility model is as follows: a test device for fuel injection pump rack control based on stepper motor drive, comprising a stepper motor, a push rod assembly, a reinforcement assembly and a fuel injection pump; The push rod assembly includes a ball screw, a push rod, and a guide cylinder. The power end of the ball screw is fixedly connected to the output shaft of the stepper motor, the resistance end of the ball screw is fixedly connected to the first end of the push rod, and the guide cylinder is axially provided with a guide hole adapted to the push rod. The second end of the push rod extends out of the guide cylinder through the guide hole and is connected to the rack of the fuel injection pump. A reinforcement component for eliminating axial error is also connected at the connection position between the second end of the push rod and the rack of the fuel injection pump.

[0006] As an optional solution, an L-shaped fixed bracket is also included. The stepper motor is fixed to the horizontal plate of the L-shaped fixed bracket. The ball screw of the push rod assembly is integrated and connected to the stepper motor. The resistance end of the ball screw faces the vertical plate of the L-shaped fixed bracket. The first end of the push rod passes through the through hole on the vertical plate and is connected to the resistance end of the ball screw. The guide cylinder is fixed to the side of the vertical plate away from the stepper motor, and the guide hole and the through hole are arranged coaxially.

[0007] Alternatively, the cross-section of the guide hole may be polygonal.

[0008] As an optional solution, the inner wall of the guide hole is provided with at least one axial guide rail, and the outer surface of the push rod is provided with a groove that matches the axial guide rail.

[0009] As an optional solution, the reinforcement components include connectors and fasteners; The connector includes a base and two connectors arranged opposite to each other on the same side of the base; the base is provided with a connection hole connected to the second end of the push rod; the two oppositely arranged connectors are respectively provided with a first through hole and a second through hole arranged coaxially. The fastener passes through the rack of the fuel injection pump and is connected to both the first through hole and the second through hole.

[0010] Alternatively, the fastener may be a pin or a bolt.

[0011] As an optional solution, a controller and a driver are also included; The controller is electrically connected to the driver, and the controller transmits pulse signals to the driver; The driver is electrically connected to the stepper motor. The driver converts the pulse signal output by the controller into control commands for the stepper motor and controls the output shaft of the stepper motor to work.

[0012] This utility model has the following unexpected beneficial effects: 1. The ball screw of the push rod assembly of this utility model accurately converts the rotational motion of the stepper motor into the linear motion of the push rod, making full use of the stepper motor's microstepping drive mode, controlling the positioning accuracy of the fuel injection pump rack to 0.001mm, directly ensuring the accuracy of fuel injection pump quantity adjustment, and meeting various test scenarios with stringent fuel quantity control requirements. It provides a precise fuel quantity adjustment basis for fuel injection pump performance testing and parameter optimization, while reducing energy loss and errors in the mechanical transmission process.

[0013] The guide hole on the guide cylinder is adapted to the push rod, which plays a good guiding role in the movement of the push rod, avoiding deviation or shaking during the movement of the push rod, and further ensuring the stability and accuracy of the transmission.

[0014] The connection point between the second end of the push rod and the fuel injection pump rack is equipped with a reinforcement component to eliminate axial error. This component can specifically address the axial clearance problem that may exist at the connection point, avoid rack positioning errors caused by clearance, and thus further improve the accuracy of rack control of the entire device, ensuring the stability of fuel quantity adjustment.

[0015] 2. This utility model uses a connector or universal joint at the connection between the rack and push rod of the fuel injection pump, so that the rack of the stepper motor will not undergo axial displacement when pushed by the push rod, thereby meeting the high precision requirements of the fuel injection pump rack test. Attached Figure Description

[0016] Figure 1 This is an overall schematic diagram of the test device for fuel injection pump rack control based on stepper motor drive according to an embodiment of the present invention; Figure 2 This is an exploded view of the components of the experimental device for controlling the rack and pinion gear of a fuel injection pump based on a stepper motor drive, according to an embodiment of this utility model. Figure 3 This is a cross-sectional view of the reinforced component of the test device for a fuel injection pump rack control based on a stepper motor drive, according to an embodiment of this utility model. Figure 4 This is a cross-sectional view of the connector portion of the test device for a fuel injection pump rack control based on a stepper motor drive, according to an embodiment of this utility model. Figure 5 This is a part diagram of the L-shaped fixed bracket of the fuel injection pump rack control test device based on stepper motor drive according to an embodiment of this utility model; In the diagram, 1. Stepper motor; 2. Push rod assembly; 201. Push rod; 202. Guide cylinder; 2021. Guide hole; 3. Reinforcing assembly; 301. Connector; 3011. Base; 3012. Connector; 3013. First through hole; 3014. Second through hole; 3015. Connecting hole; 302. Fastener; 303. Nut; 4. Fuel injection pump; 401. Rack; 5. L-shaped fixing bracket; 501. Vertical plate; 5011. Through hole; 502. Horizontal plate; 503. Mounting plate; 6. Driver; 7. Controller. Detailed Implementation

[0017] The specific embodiments of this utility model will be described in further detail below with reference to the accompanying drawings and examples. The following examples are used to illustrate this utility model, but are not intended to limit its scope.

[0018] In the description of this utility model, it should be noted that the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", and "outer" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0019] In the description of this utility model, it should be understood that the terms "connected," "linked," and "fixed," etc., used in this utility model should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or a welded connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly defined. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0020] In one embodiment, such as Figure 1 As shown, in a first aspect, this utility model provides a test device for fuel injection pump rack control based on stepper motor drive, including a stepper motor 1, a push rod assembly 2, a reinforcing assembly 3, and a fuel injection pump 4.

[0021] The stepper motor 1 is a 42 series two-phase hybrid stepper motor 1 with a step angle of 1.8°.

[0022] The push rod assembly 2 includes a ball screw, a push rod 201, and a guide cylinder 202. The power end of the ball screw is fixedly connected to the output shaft of the stepper motor 1, and the resistance end of the ball screw is fixedly connected to the first end of the push rod 201. At this time, the screw of the ball screw is fixedly connected to the output shaft of the stepper motor 1, and the nut 303 of the ball screw is fixedly connected to the first end of the push rod 201. Therefore, the screw of the ball screw is the power end of the ball screw, and the nut 303 of the ball screw is the resistance end of the ball screw.

[0023] The guide cylinder 202 is provided with a guide hole 2021 that is adapted to the push rod 201 in the axial direction. At this time, the guide hole 2021 is coaxial with the guide cylinder 202, and the guide hole 2021 penetrates the end face of the guide cylinder 202 near the fuel injection pump 4.

[0024] The second end of the push rod 201 extends out of the guide cylinder 202 through the guide hole 2021 and is connected to the rack 401 of the fuel injection pump 4. A reinforcement component 3 for eliminating axial error is also provided at the connection position between the second end of the push rod 201 and the rack 401 of the fuel injection pump 4. At this time, the rod wall of the push rod 201 fits against the hole wall of the guide hole 2021, the push rod 201 and the guide hole 2021 are clearance-fitted, and the radial displacement of the push rod 201 is ≤0.1mm.

[0025] The length of the push rod 201 is not further limited here. When the length of the push rod 201 is the same as the test length of the rack 401 of the fuel injection pump 4, the entire wall of the push rod 201 can fit into the guide hole 2021. When the length of the push rod 201 is much greater than the test length of the rack 401 of the fuel injection pump 4, the push rod 201 is divided into a mounting part and a sliding part. During the test, only the sliding part of the push rod 201 contacts the guide hole 2021. At this time, it is only necessary to ensure that the body of the sliding part of the push rod 201 can fit into the guide hole 2021, and the body of the mounting part of the push rod 201 does not need to be limited.

[0026] Based on this, the ball screw converts the rotational transmission of the stepper motor 1 into linear transmission, and the ball screw outputs this linear transmission to the rack 401 of the fuel injection pump 4 through the push rod 201. The rod wall of the push rod 201 is in contact with the wall of the guide hole 2021 on the guide cylinder 202, so that the push rod 201 can not only move under the drive of the stepper motor 1, but also avoids the displacement error caused by radial sway. This solves the problem in the prior art that it is difficult to guarantee the high precision requirements of the fuel injection pump 4 rack 401 test when the test equipment does not use a servo motor.

[0027] Furthermore, such as Figure 1 As shown, it also includes an L-shaped fixed bracket 5. The stepper motor 1 is fixed on the horizontal plate 502 of the L-shaped fixed bracket 5. The ball screw of the push rod assembly 2 is integrated and connected to the stepper motor 1. The resistance end of the ball screw faces the vertical plate 501 of the L-shaped fixed bracket 5. The first end of the push rod 201 passes through the through hole 5011 on the vertical plate 501 and is connected to the resistance end of the ball screw. The guide cylinder 202 is fixed to the side of the vertical plate 501 away from the stepper motor 1, and the guide hole 2021 is coaxially arranged with the through hole 5011.

[0028] The L-shaped fixed bracket 5 provides a stable support structure for the entire device. The stepper motor 1 is fixed on the horizontal plate 502, and the resistance end of the ball screw faces the vertical plate 501. This layout allows the vibration force generated by the stepper motor 1 during operation to be effectively dispersed and transmitted through the L-shaped fixed bracket 5, reducing the risk of deformation of individual components and improving the overall stability and reliability of the device.

[0029] The guide cylinder 202 is fixed to the side of the vertical plate 501 away from the stepper motor 1, and the guide hole 2021 and the through hole 5011 are arranged coaxially. This provides precise guidance for the movement of the push rod 201. When the push rod 201 moves, it can move in a straight line along the guide hole 2021 of the guide cylinder 202, which reduces the movement error caused by shaking or offset, improves the straightness and accuracy of the push rod 201 movement, and thus ensures the measurement or operation accuracy of the entire test device.

[0030] The bottom end face of the horizontal plate 502 of the L-shaped fixed bracket 5 is provided with a mounting plate 503 for installation with an external structure. The shape and structure of the mounting plate 503 are not further limited here. The mounting plate 503 is used as a fixed support point for the L-shaped fixed bracket 5.

[0031] The L-shaped fixed bracket 5 has a simple structural design, with clearly defined installation positions for each component, facilitating assembly and disassembly by on-site personnel. For example, the stepper motor 1 can be easily mounted on the horizontal plate 502, the push rod 201 is connected to the ball screw through a through hole, and the guide cylinder 202 is fixed to the vertical plate 501. This clear structural design allows operators to perform operations more conveniently during the installation, commissioning, and subsequent maintenance of the device, reducing the difficulty and cost of installation and maintenance.

[0032] Furthermore, such as Figure 1 As shown, the guide hole 2021 is polygonal. The specific shape of the guide hole 2021 is not further limited here. Since any polygonal guide hole 2021 includes at least one edge, it can effectively resist circumferential torque and eliminate the risk of self-rotation of the push rod 201.

[0033] At this time, the polygonal guide hole 2021 contains at least one edge. When the push rod 201 passes through the guide hole 2021 and forms a clearance fit, the edge forms a natural limiting contact with the surface of the push rod 2021. This structure can directly counteract the circumferential torque generated when the stepper motor 1 starts or stops or when the load changes suddenly. Even if the torque attempts to drive the push rod 201 to rotate around its own axis, the edge of the polygonal hole will limit the rotation tendency of the push rod 201 through rigid contact, fundamentally preventing the push rod 201 from rotating. This characteristic is crucial for ensuring transmission accuracy, because the rotation of the push rod 201 may cause the connection position with the rack 401 of the fuel injection pump 4 to shift, which in turn leads to a decrease in the transmission efficiency of the ball screw and may even cause abnormal wear between components. The polygonal guide hole 2021, through the passive limiting of the mechanical structure, can stably maintain the axial movement posture of the push rod 201 without additional power or a complex control system.

[0034] Secondly, the design balances flexibility and stability while maintaining a clearance fit. The clearance fit design is intended to reduce frictional resistance between the push rod 201 and the guide hole 2021, ensuring smooth axial movement of the push rod 201 and preventing jamming or excessive wear. The polygonal guide hole 2021, while retaining this advantage, solves the dual problems of radial wobble and circumferential rotation that easily occur with circular guide holes under clearance fits. The clearance between the circular hole and the push rod 201 allows the push rod 201 to either deviate from its axis or rotate freely under force; however, the edges of the polygonal hole, through line contact (or small-area surface contact) with the push rod 201, limit the radial offset of the push rod 201 while allowing smooth axial movement, and completely prevents circumferential rotation, thus achieving a balance between flexible movement and stable posture.

[0035] Finally, the structure is simple and highly adaptable, effectively reducing the design and maintenance costs of the entire device. The polygonal guide hole 2021 requires no complex machining processes; whether triangular, quadrilateral, or other polygonal, it can be achieved through conventional machining, and there is no strict limitation on the specific shape of the guide hole 2021, allowing for high design freedom. This structure does not rely on additional anti-rotation components (such as keyways, splines, etc.), reducing the number of parts and assembly complexity, and lowering production and maintenance costs. Furthermore, for push rods 2021 of different diameters and materials, as long as a reasonable clearance fit is formed with the polygonal hole, it can perform the anti-rotation function, demonstrating strong adaptability and facilitating the versatility and expandability of the device.

[0036] Furthermore, this embodiment is not shown in the accompanying drawings. The guide hole 2021 can adopt a symmetrical even number of sides to balance the machining difficulty and performance of the guide hole 2021. With the improvement of the machining accuracy of the guide hole 2021, the linearity error of the push rod 201 movement can be effectively reduced, and the test error of the fuel injection pump 4 rack 401 can be further reduced.

[0037] Furthermore, in this embodiment not shown in the accompanying drawings, the inner wall of the guide cylinder 202 is provided with at least one axial guide rail, and the outer surface of the push rod 201 is provided with a groove that matches the axial guide rail. In this case, the structure that counteracts the spin torque of the push rod 201 is the contact surface between the push rod 201 and the groove. Therefore, the push rod 201 forms a clear circumferential limiting structure through the cooperation of the axial guide rail and the groove, which can directly counteract the spin torque generated during the movement of the push rod 201. Moreover, the mechanical constraint of the contact surface can precisely limit the rotational degree of freedom of the push rod 201. Using a structure different from the polygonal guide hole 2021 avoids the push rod 201 from shifting, shaking, or positioning deviation caused by spin, ensuring that the push rod 201 always moves in a pure linear motion along the axial direction, thereby improving the operational stability of the device.

[0038] The cooperation between the axial guide rail and the groove further enhances the guiding effect of the guide cylinder 202 on the push rod 201, forming a double guiding constraint with the original coaxially arranged guide hole 2021, so that the push rod 201 can maintain a stable posture during high-speed or heavy-load movement, avoiding bending or vibration, and enabling the test device described in this utility model to be applicable to more stringent test conditions.

[0039] Furthermore, such as Figure 1 As shown, the reinforcement component 3 includes a connector 301 and a fastener 302; The connector 301 includes a base 3011 and two connectors 3012 arranged opposite to each other on the same side of the base 3011; the base 3011 is provided with a connecting hole 3015 connected to the second end of the push rod 201; the two connectors 3012 arranged opposite to each other are respectively provided with a first through hole 3013 and a second through hole 3014 arranged coaxially.

[0040] The fastener 302 passes through the rack 401 of the fuel injection pump 4 and is simultaneously connected to the first through hole 3013 and the second through hole 3014.

[0041] The second end of the push rod 201 is threadedly connected to the connector 301 through the connecting hole 3015. At this time, the second end of the push rod 201 pushes the connector 301 and the rack 401 of the fuel injection pump 4 to move together. Therefore, the combination structure of the connector 301 and the fastener 302 forms a rigid connection between the push rod 201 and the rack 401 of the fuel injection pump 4, ensuring that there will be no relative displacement or loosening during force transmission. The base 3011 of the connector 301 is fixed to the push rod 201 through the connecting hole 3015, and the two connecting bodies 3012 are tightly connected to the rack 401 of the fuel injection pump 4 through the fastener 302, thereby greatly improving the connection strength. The integral design of the connector reduces the loss and deformation during force transmission, so that the push or pull force of the push rod 201 can be directly and evenly applied to the rack 401 of the fuel injection pump 4. This precise force transmission characteristic helps to improve the accuracy of test data, thereby ensuring the reliability of the performance test of the fuel injection pump 4.

[0042] Furthermore, the fastener 302 is a pin or a bolt.

[0043] When the fastener 302 is a pin, after the pin is connected to the first through hole 3013 and the second through hole 3014, a nut 303 is installed on one side of the second through hole 3014. When the fastener 302 is a bolt, after the bolt is connected to the first through hole 3013 and the second through hole 3014, no other fixing is required. In this case, both the first through hole 3013 and the second through hole 3014 are threaded holes. The fastener 302 ensures that the push rod 201 is connected together by connecting the connector 301, the rack 401 of the fuel injection pump 4, and the push rod 201. 01. Axial accuracy when pushing the rack 401 of the fuel injection pump 4; When the fastener 302 uses a pin, the connector 301 is suitable for occasions requiring precise positioning and relatively stable force. The connector 301 and the pin achieve rapid positioning and fixing through interference fit or transition fit; When the fastener 302 uses a bolt, the connector 301 and the bolt are suitable for scenarios requiring detachability, easy adjustment, or bearing large loads. The connector 301 can flexibly control the connection strength through thread preload, thereby meeting the fastening requirements of different working conditions.

[0044] Furthermore, this embodiment, which is not shown in the accompanying drawings, also includes a controller 7 and a driver 6.

[0045] The controller 7 is electrically connected to the driver 6, and the controller 7 transmits pulse signals to the driver 6.

[0046] The driver 6 is electrically connected to the stepper motor 1. The driver 6 converts the pulse signal output by the controller 7 into a control command for the stepper motor 1 and controls the output shaft of the stepper motor 1 to work.

[0047] In summary, the experimental device utilizes a ball screw to convert the rotary transmission of the stepper motor 1 into linear transmission, and then the push rod 201 outputs this linear transmission power to the rack 401 of the fuel injection pump 4. The push rod 201 is sleeved with the guide cylinder 202, and the wall of the push rod 201 is clearance-fitted with the wall of the guide hole 2021 on the guide cylinder 202. This allows the push rod 201 to not only move under the drive of the stepper motor 1, but also avoids displacement errors caused by radial swaying. This solves the problem in the prior art where it is difficult to guarantee the high precision requirements of the fuel injection pump 4 rack 401 test when the test equipment does not use a servo motor.

[0048] It should be understood that the terms "first," "second," etc., are used in this utility model to describe various information, but this information should not be limited to these terms. These terms are only used to distinguish information of the same type from each other. For example, without departing from the scope of this utility model, "first" information can also be referred to as "second" information, and similarly, "second" information can also be referred to as "first" information. In addition, the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0049] The above description is only a preferred embodiment of the present utility model. It should be noted that for those skilled in the art, several improvements and substitutions can be made without departing from the technical principles of the present utility model, and these improvements and substitutions should also be considered within the protection scope of the present utility model.

Claims

1. A test device for rack and pinion control of a fuel injection pump based on stepper motor drive, characterized in that: It includes a stepper motor (1), a push rod assembly (2), a reinforcement assembly (3), and a fuel injection pump (4); The push rod assembly (2) includes a ball screw, a push rod (201) and a guide cylinder (202). The power end of the ball screw is fixedly connected to the output shaft of the stepper motor (1), and the resistance end of the ball screw is fixedly connected to the first end of the push rod (201). The guide cylinder (202) is axially provided with a guide hole (2021) that is adapted to the push rod (201). The second end of the push rod (201) extends out of the guide cylinder (202) through the guide hole (2021) and is connected to the rack (401) of the fuel injection pump (4). A reinforcement component (3) for eliminating axial error is also connected at the connection position between the second end of the push rod (201) and the rack (401) of the fuel injection pump (4).

2. The experimental apparatus according to claim 1, characterized in that: It also includes an L-shaped fixed bracket (5), the stepper motor (1) is fixed on the horizontal plate (502) of the L-shaped fixed bracket (5), the ball screw of the push rod assembly (2) is integrated and connected to the stepper motor (1), the resistance end of the ball screw faces the vertical plate (501) of the L-shaped fixed bracket (5), and the first end of the push rod (201) passes through the through hole (5011) on the vertical plate (501) and is connected to the resistance end of the ball screw; The guide cylinder (202) is fixed to the side of the vertical plate (501) away from the stepper motor, and the guide hole (2021) and the through hole (5011) are arranged coaxially.

3. The experimental apparatus according to claim 1, characterized in that: The cross-section of the guide hole (2021) is polygonal.

4. The test apparatus according to claim 1, characterized in that: The inner wall of the guide hole (2021) is provided with at least one axial guide rail, and the outer surface of the push rod (201) is provided with a groove that matches the axial guide rail.

5. The test apparatus according to claim 1, characterized in that: The reinforcement component (3) includes a connector (301) and a fastener (302); The connector (301) includes a base (3011) and two connectors (3012) arranged opposite to each other on the same side of the base; the base (3011) is provided with a connecting hole (3015) connected to the second end of the push rod (201); the two connectors (3012) arranged opposite to each other are respectively provided with a first through hole (3013) and a second through hole (3014) arranged coaxially; The fastener (302) passes through the rack (401) of the fuel injection pump (4) and is simultaneously connected to the first through hole and the second through hole.

6. The test apparatus according to claim 5, characterized in that: The fastener (302) is a pin or a bolt.

7. The test apparatus according to claim 1, characterized in that: It also includes a controller (7) and a driver (6); The controller (7) is electrically connected to the driver (6), and the controller (7) transmits pulse signals to the driver (6); The driver (6) is electrically connected to the stepper motor (1). The driver (6) converts the pulse signal output by the controller (7) into a control command for the stepper motor (1) and controls the output shaft of the stepper motor (1) to work.

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