Spring-assisted lead screw transmission device for reducing load of direct-current motor

Abstract

The invention belongs to the technical field of lead screw transmission, and particularly relates to a spring-assisted lead screw transmission device for reducing load of a direct current motor, which comprises a lead screw, one end of the lead screw is fixedly connected with a first sliding rod, the other end of the lead screw is fixedly connected with a second sliding rod, the lead screw is sleeved with a shaft sleeve, and the lead screw is in threaded connection with the shaft sleeve. The second sliding rod is rotationally sleeved with a second gasket, the second sliding rod is sleeved with a first spring, a clamping groove is formed in the side wall of the second sliding rod, the clamping groove is fixedly sleeved with a bearing sleeve, the second sliding rod is sleeved with a plane bearing, and the second sliding rod is sleeved with a conical bearing; in the upward moving or downward moving process of the steel pipe, when the shaft sleeve moves to the first sliding rod or the second sliding rod, the lead screw and the shaft sleeve are separated, the motor enters a no-load state, the situation that the motor still continuously bears large loads after the shaft sleeve reaches the stroke limit is avoided, and the risk that the motor is damaged due to overload is effectively reduced.

Description

Technical Field

[0001] The invention belongs to the technical field of screw transmission, and in particular relates to a spring-assisted screw transmission device for alleviating the load of a DC motor. Background Art

[0002] A lead screw, also known as a screw, is a mechanical transmission element that converts rotational motion into linear motion, or vice versa. It typically consists of a screw with a spiral groove on the screw's surface and a nut with matching threads inside. As the screw rotates, the nut moves linearly along the screw's axis. It is widely used in various mechanical devices requiring precise linear motion.

[0003] In many devices that utilize lead screw transmissions, DC motors are often used as the power source to drive the lead screw, thereby achieving linear motion of the load. However, existing transmissions of this type present a significant problem. During operation, the sleeve moves along the lead screw in a specific direction. When the sleeve reaches the limit of its travel, the motor continues to output power due to the lack of an effective load regulation mechanism. This causes the interaction force between the lead screw and sleeve to continuously increase, placing a heavy load on the motor.

[0004] This continuous high load condition is extremely detrimental to motor operation. On the one hand, prolonged overload conditions subject the motor's internal components to significant stress and wear, accelerating aging and damage, and shortening the motor's service life. On the other hand, overload can also cause problems such as motor overheating and excessive current, increasing the probability of motor failure and, in severe cases, even causing the motor to burn out, disrupting the normal operation of the entire equipment, resulting in production stagnation and increased repair costs. Summary of the Invention

[0005] In order to solve the above problems, the present invention proposes a spring-assisted screw transmission device for reducing the load of a DC motor.

[0006] The technical solution adopted by the present invention is as follows: The present invention provides a spring-assisted lead screw transmission device for reducing the load of a DC motor, including a lead screw, one end of the lead screw is fixedly connected to a first slide rod, the other end of the lead screw is fixedly connected to a second slide rod, a sleeve is sleeved on the lead screw, the lead screw and the sleeve are threadedly connected, a second gasket is rotatably sleeved on the second slide rod, a first spring is sleeved on the second slide rod, a slot is provided on the side wall of the second slide rod, a bearing sleeve is fixedly sleeved on the slot, a plane bearing is sleeved on the second slide rod, a tapered bearing is sleeved on the second slide rod, one end of the first slide rod is fixedly connected to the first gasket, a second spring is sleeved on the first slide rod, and a slide is slidably provided on the first slide rod.

[0007] Furthermore, the plane bearing is arranged between the second gasket and the bearing sleeve, and the tapered bearing is arranged below the bearing sleeve.

[0008] Furthermore, the first spring is arranged above the second gasket, and the shaft sleeve is arranged above the first spring.

[0009] Furthermore, the second spring is arranged below the first gasket, and the sliding plate is arranged below the second spring.

[0010] Furthermore, the lower end of the second sliding rod is used to connect to the motor.

[0011] Furthermore, the diameter of the second sliding rod is smaller than the diameter of the lead screw, and the diameter of the first sliding rod is smaller than the diameter of the lead screw.

[0012] Furthermore, the first spring is used to push the sleeve against the spiral groove at the lower end of the lead screw.

[0013] The beneficial effects achieved by the present invention using the above structure are as follows: (1) When the steel pipe moves up or down, when the sleeve moves to the first slide bar or the second slide bar, the lead screw and the sleeve separate, and the motor enters a no-load state, which prevents the motor from continuing to bear a large load after the sleeve reaches the stroke limit, effectively reducing the risk of damage to the motor due to overload, extending the service life of the motor, and reducing equipment maintenance costs.

[0014] (2) The first spring and the second spring act as a buffer during the movement of the sleeve. When the sleeve is separated from or inserted into the screw, the elastic force of the spring can smoothly transition the load change, avoiding the impact on the motor caused by the sudden load change, and further protecting the stable operation of the motor.

[0015] (3) The setting of the bearing sleeve prevents the displacement of the second slide bar, ensures the stable connection between the second slide bar and the motor output end and the lead screw, and prevents the transmission device from shaking or offsetting during operation, thereby improving the reliability of the entire transmission system. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the technical solution of the present invention, the following is a brief introduction to the drawings required for the description. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0017] Figure 1 This is a main diagram of a spring-assisted screw transmission device for alleviating load on a DC motor according to the present invention; Figure 2 Schematic diagram of the second sliding bar structure.

[0018] Among them, 1. screw, 2. sleeve, 3. first spring, 4. second spring, 5. first gasket, 6. second gasket, 7. first slide bar, 8. second slide bar, 9. bearing sleeve, 10. plane bearing, 11. slot, 12. tapered bearing, 13. slide. DETAILED DESCRIPTION

[0019] In order to make the purpose, features, and advantages of the present invention more obvious and easy to understand, the technical solutions of the present invention will be clearly and completely described below in conjunction with the drawings in this specific embodiment. Obviously, the embodiments described below are only part of the embodiments of the present invention, not all of them. Based on the embodiments in this patent, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of this patent.

[0020] like Figure 1-Figure 2 As shown, the present invention proposes a spring-assisted screw transmission device for reducing the load of a DC motor, including a screw 1, one end of the screw 1 is fixedly connected to a first slide bar 7, the other end of the screw 1 is fixedly connected to a second slide bar 8, the diameter of the second slide bar 8 is smaller than the diameter of the screw 1, the diameter of the first slide bar 7 is smaller than the diameter of the screw 1, the lower end of the second slide bar 8 is used to connect to the motor, the screw 1 is sleeved with a shaft sleeve 2, the screw 1 and the shaft sleeve 2 are threadedly connected, the second slide bar 8 is rotatably sleeved with a second gasket 6, the second slide bar 8 is sleeved with a first spring 3, the first spring 3 is arranged above the second gasket 6, and the shaft sleeve 2 is arranged above the first spring 3. A slot 11 is provided on the side wall of the second slide rod 8, and a bearing sleeve 9 is fixedly sleeved on the slot 11. A plane bearing 10 is sleeved on the second slide rod 8. The plane bearing 10 is arranged between the second gasket 6 and the bearing sleeve 9. A tapered bearing 12 is arranged below the bearing sleeve 9. The tapered bearing 12 is sleeved on the second slide rod 8. One end of the first slide rod 7 is fixedly connected to the first gasket 5. A second spring 4 is sleeved on the first slide rod 7. The second spring 4 is arranged below the first gasket 5. A slide 13 is arranged below the second spring 4. A slide 13 is slidingly provided on the first slide rod 7. The first spring 3 is used to push the sleeve 2 against the spiral groove at the lower end of the screw 1.

[0021] When in use, the lower end of the second slide bar 8 is used to connect the motor, and the side wall of the sleeve 2 is welded to the inner wall of the steel pipe. When the steel pipe needs to move up, the motor output end rotates to drive the second slide bar 8 to rotate, and the second slide bar 8 rotates to drive the screw 1 to rotate. Since the first spring 3 presses the sleeve 2 against the spiral groove at the lower end of the screw 1, the sleeve 2 enters the screw 1 and moves on the screw 1 until the sleeve 2 moves to the first slide bar 7. At this time, the screw 1 and the sleeve 2 are separated, the second spring 4 is compressed, and the motor continues to rotate and enters the no-load state. When it is needed When the steel pipe moves downward, the motor output end rotates in the opposite direction to drive the second slide bar 8 to rotate, and the rotation of the second slide bar 8 drives the screw 1 to rotate. Since the second spring 4 pushes the sleeve 2 against the spiral groove at the upper end of the screw 1, the sleeve 2 enters the screw 1 and moves on the screw 1 until the sleeve 2 moves to the second slide bar 8. At this time, the first spring 3 is compressed, and the motor continues to rotate and enters a no-load state, thereby protecting the motor. The setting of the bearing sleeve 9 prevents the second slide bar 8 from being displaced. The above is the overall working process of the present invention. Just repeat this step when you use it next time.

[0022] It can be seen from the above embodiments that the beneficial effects of the present invention are: During the upward or downward movement of the steel pipe, when the sleeve moves onto the first slide bar or the second slide bar, the lead screw and sleeve separate, and the motor enters a no-load state. This design prevents the motor from continuing to bear a large load after the sleeve reaches its travel limit, effectively reducing the risk of damage to the motor due to overload, extending the service life of the motor, and reducing equipment maintenance costs; the first spring and the second spring act as a buffer during the movement of the sleeve. When the sleeve detaches from or enters the lead screw, the elastic force of the spring can smoothly transition the load change, avoiding impact on the motor due to sudden load changes, and further protecting the stable operation of the motor; the setting of the bearing sleeve prevents the displacement of the second slide bar, ensuring a stable connection between the second slide bar and the motor output end and the lead screw, so that the transmission device will not shake or deflect during operation, thereby improving the reliability of the entire transmission system.

[0023] The above description of the disclosed embodiments is intended to enable one skilled in the art to implement or use the present invention. Various modifications to these embodiments will be readily apparent to one skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention is not limited to the embodiments shown herein but is intended to conform to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A spring-assisted screw drive device for reducing the load of a DC motor, comprising a screw (1), characterized in that: One end of the lead screw (1) is fixedly connected to the first slide rod (7), the other end of the lead screw (1) is fixedly connected to the second slide rod (8), the lead screw (1) is sleeved with a shaft sleeve (2), the lead screw (1) and the shaft sleeve (2) are threadedly connected, the second slide rod (8) is rotatably sleeved with a second gasket (6), the second slide rod (8) is sleeved with a first spring (3), a slot (11) is provided on the side wall of the second slide rod (8), a bearing sleeve (9) is fixedly sleeved on the slot (11), a plane bearing (10) is sleeved on the second slide rod (8), a tapered bearing (12) is sleeved on the second slide rod (8), one end of the first slide rod (7) is fixedly connected to the first gasket (5), the first slide rod (7) is sleeved with a second spring (4), and the first slide rod (7) is slidably provided with a slide plate (13).

2. The spring-assisted screw transmission device for reducing the load of a DC motor according to claim 1, characterized in that: The plane bearing (10) is arranged between the second gasket (6) and the bearing sleeve (9), and the tapered bearing (12) is arranged below the bearing sleeve (9).

3. The spring-assisted screw transmission device for alleviating load on a DC motor according to claim 1, characterized in that: The first spring (3) is arranged above the second gasket (6), and the shaft sleeve (2) is arranged above the first spring (3).

4. The spring-assisted screw transmission device for alleviating load on a DC motor according to claim 1, characterized in that: The second spring (4) is arranged below the first gasket (5), and the sliding plate (13) is arranged below the second spring (4).

5. The spring-assisted screw transmission device for alleviating load on a DC motor according to claim 1, characterized in that: The lower end of the second slide bar (8) is used to connect to the motor.

6. The spring-assisted screw transmission device for alleviating load on a DC motor according to claim 1, characterized in that: The diameter of the second slide rod (8) is smaller than the diameter of the lead screw (1), and the diameter of the first slide rod (7) is smaller than the diameter of the lead screw (1).

7. The spring-assisted screw transmission device for alleviating load on a DC motor according to claim 1, characterized in that: The first spring (3) is used to press the sleeve (2) against the spiral groove at the lower end of the lead screw (1).

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