Pressure applying device based on double-rotation-direction lead screw and using method of pressure applying device

Abstract

The invention discloses a pressure applying device based on a double-rotation-direction lead screw and a using method of the pressure applying device. The pressure applying device comprises a clamping plate, a guide rail, a moving mechanism and a driving mechanism. At least two double-rotation-direction lead screws are arranged between side plates on the two sides of the moving mechanism, reverse threads at the two ends of each lead screw are connected with two clamping plates respectively, and the driving mechanism synchronously drives the lead screws to rotate in the same direction, so that the clamping plates symmetrically clamp or get away from a workpiece. In a preferable scheme, the four double-rotation-direction lead screws realize synchronous constant-speed rotation through a torque motor and a gear set, and are matched with the layout of the lead screws which are uniformly distributed on the periphery, so that the uniform surface pressure applied by the clamping plates can be kept constant, and the middle surface does not deflect; reliability is improved through the standby design of a hand rocker of the driven gear set. The device solves the problems that a traditional pressure applying device is uneven in pressure, unstable in size, difficult in automation and the like through symmetrical driving and constant torque transmission of the double-rotation-direction lead screw, is suitable for stator bar end brazing and other scenes needing accurate pressure control, and remarkably improves the workpiece machining quality and the production efficiency.

Description

Technical Field

[0001] The present invention relates to a pressure application tool for brazing processes in the field of manufacturing, specifically a symmetric constant pressure application device based on a double - helix screw, applicable to scenarios that require precise pressure control, such as brazing the ends of stator bars. Background Art

[0002] In fields such as motor manufacturing, brazing the ends of stator bars is a key process. A pressure application device is required to ensure that the bars maintain a stable contact pressure during the heating process to form high - quality brazed joints. Traditional pressure application devices for brazing the ends of stator bars usually use two single - helix screws to connect two clamping plates respectively, and the pressing force is adjusted by manually rotating the screws. However, such devices have significant defects:

[0003] Poor dimensional stability: When manually adjusting the single - helix screws, it is difficult to ensure that the moving distances of the left and right screws are exactly the same, resulting in deflection or rotation of the middle plane of the stator bar, affecting the dimensional accuracy of the bar and thus reducing the subsequent installation efficiency.

[0004] Insufficient pressure uniformity: The single - screw - driven clamping plate is prone to generating eccentric pressure, causing uneven stress in the area to be brazed, resulting in inconsistent strength of the brazed joints and even defects such as false soldering and cracks.

[0005] Dynamic pressure fluctuation: During the heating process, the ends of the bars soften. In traditional devices, manual continuous adjustment of the screws is required to maintain the pressure. If the operation is not timely, it will lead to insufficient or excessive pressure, affecting the stability of the brazing quality.

[0006] High labor intensity: During the brazing process, the screws need to be manually adjusted multiple times. The operation is cumbersome and time - consuming, increasing the labor load of workers.

[0007] Difficulty in automation: The left and right screws move independently, lacking a linkage mechanism, making it difficult to integrate with an automated control system, which limits the intelligent upgrade of the production line.

[0008] To solve the above problems, existing technologies have tried to optimize by improving the screw structure or adding pressure sensors, etc., but still have not achieved symmetric constant pressure control and automated operation. Therefore, there is an urgent need for a new pressure application device that can ensure the stability of the middle plane of the bar, uniform and constant pressure, and facilitate automation. Summary of the Invention

[0009] The present invention aims to overcome the above - mentioned disadvantages of the existing technologies and provides a combined cable clamp structure for a suspension bridge.

[0010] The technical solution adopted by the present invention is as follows:

[0011] A pressing device based on a double - helix screw rod, comprising: a clamping plate, a guide rail, and a moving mechanism slidably disposed on the guide rail; side plates are provided on both sides of the moving mechanism, and at least two double - helix screw rods are rotatably disposed between the side plates. The two ends of the double - helix screw rod are provided with threads having the same parameters and opposite helix directions.

[0012] Two clamping plates are provided at the two ends of multiple double - helix screw rods. When the multiple double - helix screw rods rotate, the two clamping plates clamp or move away from each other.

[0013] It further includes a driving mechanism disposed on the moving mechanism for synchronously driving multiple double - helix screw rods to rotate in the same direction.

[0014] Furthermore, the driving mechanism includes a torque motor, a driving gear, a driven gear set, and double - helix screw rod gears.

[0015] The torque motor is installed on the moving mechanism, and the driving gear is connected to the output shaft of the torque motor through a key.

[0016] The driven gear set meshes with the driving gear. Multiple double - helix screw rod gears are sleeved on multiple double - helix screw rods, and the driven gear set drives the multiple double - helix screw rod gears to rotate synchronously.

[0017] Furthermore, the number of double - helix screw rods is four, and the four double - helix screw rods have the same specifications.

[0018] The multiple double - helix screw rod gears are four identical gears, and the four gears are connected to the same driven gear to ensure that the four double - helix screw rods rotate synchronously and at the same speed.

[0019] Furthermore, the clamping plate is installed at the end of the screw rod by cooperating with the threads at both ends of the double - helix screw rod. When the double - helix screw rod rotates, the two clamping plates move in opposite directions and the moving distances are the same.

[0020] Furthermore, an empty keyway is provided on the gear shaft of the driven gear set, and the empty keyway is used to install a hand rocker to manually drive the rotation of the driven gear set when the torque motor fails.

[0021] Furthermore, a threaded hole is provided on the moving mechanism, and a single - helix screw rod is also provided on the guide rail. The single - helix screw rod is connected to the moving mechanism through the threaded hole for adjusting the position of the moving mechanism on the guide rail.

[0022] Furthermore, multiple double - helix screw rods are evenly distributed around the clamping plate, and the clamping plate is synchronously driven by the screw rods around it to ensure that the applied pressure is non - eccentric.

[0023] Furthermore, a method for using a pressing device based on a double - helix screw rod includes the following steps:

[0024] S1: Adjust the moving mechanism along the guide rail to a suitable initial position by rotating the single - helix screw rod on the guide rail, so that the two clamping plates are at a suitable spacing, and place the workpiece to be pressed between the two clamping plates.

[0025] S2: Start the torque motor in the driving mechanism. The torque motor drives the driven gear set to rotate through the driving gear, and the driven gear set further drives the double - helix screw rod gear set, causing multiple double - helix screw rods to rotate synchronously in the same direction. Since the thread directions at both ends of the double - helix screw rod are opposite, the two clamping plates move symmetrically closer to each other along the screw rod until the clamping plates tightly clamp the workpiece.

[0026] S3: During the processing of the workpiece (such as heating and brazing, etc.), when the pressure between the clamping plates changes due to physical property changes of the workpiece (such as softening), the torque motor, relying on its output constant torque, continuously drives the double - helix screw rod to rotate, automatically adjusting the position of the clamping plates to maintain a constant pressure on the workpiece.

[0027] Furthermore, in step S2, if the torque motor fails, the hand - rocker can be installed in the empty keyway of the gear shaft of the driven gear set. By manually rotating the hand - rocker, the driven gear set is driven to rotate, and then the double - helix screw rod is driven to rotate, realizing the clamping or separating operation of the two clamping plates, ensuring the continuation of the pressing work.

[0028] Furthermore, after the processing of the workpiece is completed, the following steps are carried out:

[0029] Pressure - reducing operation: Control the torque motor to reverse. Through the transmission of the driving gear, the driven gear set and the double - helix screw rod gear set, multiple double - helix screw rods rotate synchronously in the opposite direction, and the two clamping plates move symmetrically away from each other along the screw rod to reduce the pressure on the workpiece.

[0030] Taking out the workpiece: When the spacing between the clamping plates is large enough, take out the processed workpiece from between the two clamping plates.

[0031] Position reset: Rotate the single - helix screw rod on the guide rail again to adjust the moving mechanism to the initial position, preparing for the next pressing operation.

[0032] In summary, due to the adoption of the above - mentioned technical solution, the beneficial effects of the present invention are as follows:

[0033] Through the innovative combination of the double - helix screw rod and the torque motor, the present invention realizes the function of symmetric and constant pressing, and has the following remarkable beneficial effects:

[0034] Precise and symmetric pressing: The reverse threads at both ends of the double - helix screw rod cooperate with the synchronous drive of multiple screw rods, enabling the clamping plate group to move symmetrically, ensuring that the middle surface of the workpiece has no deflection or rotation, significantly improving the dimensional stability of workpieces such as stator bars, avoiding position deviations caused by traditional single - screw adjustment, and providing an accurate reference for subsequent installation processes.

[0035] Constant and uniform pressure: The torque motor outputs a constant torque. Through the transmission of the gear set, the clamping plate group automatically adjusts its position when the workpiece is softened (such as brazing heating) to maintain a constant pressure. The screw rod structure evenly distributed around eliminates the eccentric load, realizes the application of uniform surface pressure on the workpiece surface, and solves the problem of the quality of brazing joints caused by uneven pressure in the traditional device.

[0036] High-efficiency automatic adaptation: A single power input drives the synchronous movement of multiple screw rods, simplifies the control logic, and is convenient for integration into the automatic production line. The spare hand rocker design of the driven gear group can still be manually operated when the motor fails, taking into account both reliability and flexibility. At the same time, it reduces frequent manual adjustment, reduces labor intensity, and improves production efficiency and process stability. Description of the drawings

[0037] Figure 1 is a schematic structural diagram of the present invention;

[0038] Figure 2 is a schematic structural diagram of the transmission system of the present invention.

[0039] Markings in the figure:

[0040] 1 - torque motor, 2 - driving gear, 3 - driven gear, 4 - double-threaded screw gear, 5 - double-threaded screw, 6 - clamping plate, 7 - moving mechanism, 8 - guide rail, 9 - single-threaded screw.

[0041] Specific examples

[0042] The present invention will be described in detail below with reference to the drawings.

[0043] In order to make the purpose, technical solutions and advantages of the present invention clearer, the present invention will be further described in detail below with reference to the drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0044] Embodiment 1

[0045] In this embodiment, as Figure 1 shown, a pressure-applying device based on a double-threaded screw includes: a clamping plate, a guide rail, and a moving mechanism slidably disposed on the guide rail; side plates are disposed on both sides of the moving mechanism, and at least two double-threaded screws are rotatably disposed between the side plates. The two ends of the double-threaded screw are provided with threads having the same parameters and opposite helix directions;

[0046] Two clamping plates are provided at both ends of multiple double-threaded screws, and the two clamping plates clamp or move away from each other when the multiple double-threaded screws rotate;

[0047] It further includes a driving mechanism disposed on the moving mechanism for synchronously driving the multiple double-threaded screws to rotate in the same direction.

[0048] The pressing device mainly includes clamping plates, guide rails and a moving mechanism. The moving mechanism can slide on the guide rails. Side plates are arranged on both sides of the moving mechanism, and at least two double-helix screws are rotatably installed between the side plates. Two clamping plates are respectively arranged at both ends of multiple double-helix screws. The driving mechanism is installed on the moving mechanism.

[0049] The double-helix screws and the side plates are rotatably connected by means of bearings, etc. The clamping plates and the double-helix screws are connected by thread fit, and there is a driving connection between the driving mechanism and the double-helix screws.

[0050] After the driving mechanism is started, it synchronously drives multiple double-helix screws to rotate in the same direction. Since the thread directions at both ends of the double-helix screws are opposite, the two clamping plates will move closer to or away from each other along the screws.

[0051] This setting method utilizes the characteristics of the double-helix screws, enabling the clamping plates to move symmetrically. Compared with the traditional single-screw drive, it can avoid the deflection or rotation of the middle surface of the workpiece and ensure the stability of the workpiece position during the pressing process. The principle is that the opposite threads at both ends of the double-helix screws make the forces on the clamping plates symmetric and the movements synchronous.

[0052] Furthermore, the driving mechanism includes a torque motor, a driving gear, a driven gear set and double-helix screw gears;

[0053] The torque motor is installed on the moving mechanism, and the driving gear is connected to the output shaft of the torque motor by a key;

[0054] The driven gear set meshes with the driving gear, and multiple double-helix screw gears are sleeved on multiple double-helix screws. The driven gear set drives the multiple double-helix screw gears to rotate synchronously.

[0055] The driving mechanism consists of a torque motor, a driving gear, a driven gear set and double-helix screw gears. The torque motor is installed on the moving mechanism, the driving gear is connected to the output shaft of the torque motor by a key, the driven gear set meshes with the driving gear, and multiple double-helix screws are respectively sleeved with multiple double-helix screw gears.

[0056] The driving gear and the torque motor are key-connected, which can transmit the power of the motor; the driven gear set and the driving gear are in a meshing relationship to achieve further power transmission; the double-helix screw gears are sleeved on the double-helix screws, and there is a driving connection between the driven gear set and the double-helix screw gears.

[0057] When the torque motor is started, it drives the driving gear to rotate. The driving gear drives the driven gear set to rotate, and the driven gear set then drives the multiple double-helix screw gears to rotate synchronously, thereby causing the double-helix screws to rotate.

[0058] With this gear-driven drive mechanism, the power of the torque motor can be stably transmitted to the double-threaded lead screw, achieving synchronous drive of multiple lead screws. Gear drive has the characteristics of high transmission efficiency and good stability. The principle is to ensure the accuracy and synchronism of power transmission through the precise meshing between gears.

[0059] Further, the number of double-threaded lead screws is four, and the four double-threaded lead screws have the same specifications;

[0060] The multiple double-threaded lead screw gears are four identical gears, and the four gears are connected to the same driven gear to ensure that the four double-threaded lead screws rotate synchronously and at the same speed.

[0061] The number of double-threaded lead screws is four and they have the same specifications. The four double-threaded lead screw gears are also the same, and these four gears are all connected to the same driven gear.

[0062] The four identical double-threaded lead screw gears mesh with the same driven gear, and each double-threaded lead screw gear is sleeved on a double-threaded lead screw.

[0063] When the driven gear rotates, it simultaneously drives the four double-threaded lead screw gears to rotate synchronously, so that the four double-threaded lead screws rotate synchronously and at the same speed.

[0064] The four double-threaded lead screws with the same specifications rotate synchronously, enabling the clamping plates to move more stably and symmetrically. The four identical double-threaded lead screw gears are connected to the same driven gear, ensuring the consistency of power transmission and making the four lead screws rotate at the same speed. This can further improve the uniformity and symmetry of the pressure applied. The principle is that lead screws and gears of the same specifications can ensure the consistency of movement under the same driving force.

[0065] Further, the clamping plates are installed at the ends of the lead screws through thread fitting with both ends of the double-threaded lead screws. When the double-threaded lead screw rotates, the two clamping plates move in opposite directions and the moving distances are the same.

[0066] The clamping plates are installed at the ends of the lead screws by fitting with both ends of the double-threaded lead screws through threads. The clamping plates are thread-connected to the double-threaded lead screws. This connection method enables the rotation of the lead screw to be converted into the linear movement of the clamping plates. When the double-threaded lead screw rotates, due to the opposite thread directions at both ends, the two clamping plates will move along the lead screw in opposite directions and the moving distances are the same.

[0067] This setting ensures the symmetry of the clamping plates during the pressure application process and enables the workpiece to receive uniform pressure. The thread connection method can accurately convert the rotational movement of the lead screw into the linear movement of the clamping plates. The principle is that the pitch and direction of the threads determine the moving direction and distance of the clamping plates, and the opposite threads at both ends make the clamping plates move symmetrically.

[0068] Further, a hollow keyway is provided on the gear shaft of the driven gear set, and the hollow keyway is used to install a hand rocker so as to manually drive the rotation of the driven gear set in case of a torque motor failure.

[0069] A hollow keyway is formed on the gear shaft of the driven gear set. The hollow keyway is used to install a hand rocker, and after the hand rocker is installed, a driving connection can be established with the driven gear set. When the torque motor fails, the hand rocker is installed in the hollow keyway, and the hand rocker is manually rotated to drive the rotation of the driven gear set, thereby driving the rotation of the double-threaded screw.

[0070] A backup method of manual drive is added, improving the reliability of the device. When the motor fails, the pressing operation can still be completed through the hand rocker. The principle is that the hand rocker is connected to the driven gear set through the hollow keyway and can provide driving force instead of the motor.

[0071] Further, a threaded hole is provided on the moving mechanism, and a single-threaded screw is also provided on the guide rail. The single-threaded screw is connected to the moving mechanism through the threaded hole and is used to adjust the position of the moving mechanism on the guide rail.

[0072] A threaded hole is provided on the moving mechanism, and a single-threaded screw is installed on the guide rail. The single-threaded screw passes through the threaded hole of the moving mechanism. The single-threaded screw and the moving mechanism form a threaded connection through the threaded hole, and this connection enables the rotation of the screw to drive the moving mechanism to slide on the guide rail. By rotating the single-threaded screw, the moving mechanism will move along the guide rail, thereby adjusting the initial positions of the two clamping plates.

[0073] The position can be adjusted according to different workpieces, improving the versatility of the device. The threaded connection method can conveniently convert the rotational motion of the screw into the linear motion of the moving mechanism. The principle is that the relative motion of the screw pair realizes the adjustment of the position.

[0074] Further, multiple double-threaded screws are evenly distributed around the clamping plate, and the clamping plate is synchronously driven by the screws around it to ensure that the applied pressure is non-eccentric.

[0075] Multiple double-threaded screws are evenly distributed around the clamping plate. Each double-threaded screw is threadedly connected to the clamping plate and has a driving connection with the driving mechanism. When the driving mechanism drives the multiple double-threaded screws to rotate synchronously, the screws around the clamping plate simultaneously apply forces to the clamping plate, causing the clamping plate to approach or move away evenly.

[0076] Ensure that the pressure applied by the clamping plate is non-eccentric, enabling all parts of the workpiece to receive uniform pressure. Multiple screws are evenly distributed around, applying forces to the clamping plate from multiple directions and balancing each other, avoiding the situation of excessive or insufficient local pressure. The principle is that the principle of force balance makes the pressure distribution uniform.

[0077] Embodiment 2

[0078] A method for using a pressing device based on a double - helix lead screw, comprising the following steps:

[0079] S1: By rotating the single - helix lead screw on the guide rail, adjust the moving mechanism along the guide rail to a suitable initial position, so that the two clamping plates are at a suitable spacing, and place the workpiece to be pressed between the two clamping plates.

[0080] S2: Start the torque motor in the driving mechanism. The torque motor drives the driven gear group to rotate through the driving gear, and the driven gear group further drives the double - helix lead screw gear group, so that multiple double - helix lead screws rotate synchronously in the same direction. Since the thread helix directions at both ends of the double - helix lead screw are opposite, the two clamping plates symmetrically approach each other along the lead screw until the clamping plates tightly clamp the workpiece.

[0081] S3: During the processing of the workpiece (such as heating and brazing, etc.), when the pressure between the clamping plates changes due to the change of the physical properties of the workpiece (such as softening), the torque motor, relying on its output constant torque, continuously drives the double - helix lead screw to rotate, automatically adjusting the position of the clamping plates to maintain a constant pressure on the workpiece.

[0082] First, rotate the single - helix lead screw on the guide rail to move the moving mechanism along the guide rail to a suitable position. After adjusting the spacing between the two clamping plates, place the workpiece to be pressed. Then start the torque motor. Through the transmission of the driving gear, the driven gear group and the double - helix lead screw gear group, multiple double - helix lead screws rotate synchronously in the same direction, and the two clamping plates symmetrically approach and clamp the workpiece. During the processing of the workpiece, when the pressure between the clamping plates changes due to the change of the physical properties of the workpiece, the torque motor, relying on the constant torque, continuously drives the double - helix lead screw to rotate, automatically adjusting the position of the clamping plates to maintain a constant pressure.

[0083] The whole operation process realizes the precise pressing of the workpiece and the maintenance of a constant pressure. By adjusting the position first and then pressing, it can adapt to different workpieces. The constant torque output of the torque motor ensures the stability of the pressure when the characteristics of the workpiece change. The principle is that the constant - torque characteristic of the motor enables it to automatically adjust the output power when the load changes, maintaining the rotation of the lead screw, thus ensuring a constant pressure of the clamping plates.

[0084] Further, in step S2, if the torque motor fails, the hand - rocker can be installed in the empty keyway of the gear shaft of the driven gear group. By manually rotating the hand - rocker, drive the driven gear group to rotate, and then drive the double - helix lead screw to rotate, realizing the clamping or separation operation of the two clamping plates to ensure the continuation of the pressing work.

[0085] In step S2, if the torque motor fails, install the hand - rocker in the empty keyway of the gear shaft of the driven gear group, manually rotate the hand - rocker to drive the driven gear group to rotate, and then drive the double - helix lead screw to rotate, realizing the clamping or separation operation of the clamping plates.

[0086] An emergency operation mode is provided for the device, ensuring the continuity of the pressure application work. When the motor fails, the hand crank can replace the motor to provide power and maintain the normal operation of the device. The principle is that the hand crank realizes the rotation of the lead screw by connecting with the driven gear set.

[0087] Further, after the machining of the workpiece is completed, the following steps are carried out:

[0088] Pressure reduction operation: Control the torque motor to reverse. Through the transmission of the driving gear, the driven gear set and the double - helix lead screw gear set, multiple double - helix lead screws rotate synchronously in the opposite direction, and the two clamping plates move symmetrically away from each other along the lead screws, reducing the pressure on the workpiece.

[0089] Taking out the workpiece: When the distance between the clamping plates is large enough, take out the machined workpiece from between the two clamping plates.

[0090] Position reset: Rotate the single - helix lead screw on the guide rail again to adjust the moving mechanism to the initial position, preparing for the next pressure application operation.

[0091] After the machining of the workpiece is completed, control the torque motor to reverse. Through the transmission, multiple double - helix lead screws rotate synchronously in the opposite direction, and the two clamping plates move symmetrically away from each other to reduce the pressure on the workpiece. When the distance between the clamping plates is large enough, take out the machined workpiece. Finally, rotate the single - helix lead screw on the guide rail again to adjust the moving mechanism to the initial position.

[0092] It facilitates the taking out of the workpiece and the reset of the device, preparing for the next pressure application operation. The reverse rotation of the motor and the reverse rotation of the lead screw make the clamping plates move away from the workpiece. The single - helix lead screw adjusts the position of the moving mechanism. The principle is to realize the reverse movement of the clamping plates by changing the rotation direction of the motor and the lead screw, and to adjust the position of the moving mechanism through screw drive.

[0093] The above are only the preferred embodiments of the invention and are not intended to limit the present invention. Any modifications, equivalent replacements, and improvements made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. A pressure applying device based on a double-helix lead screw, characterized in that: Comprising: A splint, a guide rail, and a moving mechanism slidably disposed on the guide rail; side plates are provided on both sides of the moving mechanism, and at least two double-threaded screws are rotatably disposed between the side plates. The two ends of the double-threaded screw are provided with threads having the same parameters and opposite rotation directions. Two splints are provided at the two ends of the plurality of double-threaded screws. The two splints clamp or move away from each other when the plurality of double-threaded screws rotate. It further includes a driving mechanism disposed on the moving mechanism for synchronously driving the plurality of double-threaded screws to rotate in the same direction.

2. The pressure applying device based on a double - helix lead screw according to claim 1, characterized in that: The driving mechanism includes a torque motor, a driving gear, a driven gear set, and a double-threaded screw gear. The torque motor is installed on the moving mechanism, and the driving gear is connected to the output shaft of the torque motor by a key. The driven gear set meshes with the driving gear. A plurality of double-threaded screw gears are sleeved on the plurality of double-threaded screws, and the driven gear set drives the plurality of double-threaded screw gears to rotate synchronously.

3. The pressure applying device based on a double-helix lead screw according to claim 2, characterized in that: The number of the double-threaded screws is four, and the four double-threaded screws have the same specifications. The plurality of double-threaded screw gears are four identical gears, and the four gears are connected to the same driven gear to ensure that the four double-threaded screws rotate synchronously and at the same speed.

4. The pressure applying device based on a double-helix lead screw according to claim 1, wherein: The splint is installed at the end of the screw by matching with the threads at both ends of the double-threaded screw. When the double-threaded screw rotates, the two splints move in opposite directions and the moving distances are the same.

5. The pressure applying device based on a double-helix lead screw according to claim 2, characterized in that: An empty key slot is provided on the gear shaft of the driven gear set for installing a hand rocker to manually drive the rotation of the driven gear set when the torque motor fails.

6. The pressing device based on a double-helix lead screw according to claim 1, characterized in that: A threaded hole is provided on the moving mechanism, and a single-threaded screw is further provided on the guide rail. The single-threaded screw is connected to the moving mechanism through the threaded hole for adjusting the position of the moving mechanism on the guide rail.

7. The pressure applying device based on a double-helix lead screw according to claim 1, wherein: The plurality of double-threaded screws are evenly distributed around the splint, and the splint is synchronously driven by the screws around it to ensure that the applied pressure is non-eccentric.

8. A method for using a pressing device based on a double-threaded lead screw, which is applied to the pressing device based on a double-threaded lead screw described in claims 1-7, characterized in that: Including the following steps: S1: By rotating the single-threaded screw on the guide rail, the moving mechanism is adjusted along the guide rail to a suitable initial position, so that the two splints are at a suitable distance, and the workpiece to be pressed is placed between the two splints. S2: Start the torque motor in the driving mechanism. The torque motor drives the driven gear set to rotate through the driving gear. The driven gear set further drives the double-threaded screw gear set, so that the plurality of double-threaded screws rotate synchronously in the same direction. Since the thread rotation directions at the two ends of the double-threaded screw are opposite, the two splints move symmetrically closer to each other along the screw until the splints tightly clamp the workpiece. S3: During the processing of the workpiece (such as heating and brazing, etc.), when the pressure between the splints changes due to the change of the physical properties of the workpiece (such as softening), the torque motor, relying on the constant torque output by it, continuously drives the double-threaded screw to rotate, automatically adjusting the position of the splint to maintain a constant pressure on the workpiece.

9. The method of using a pressure applying device based on a double-helix lead screw according to claim 8, characterized in that: In the step S2, if the torque motor fails, the hand rocker can be installed in the empty keyway of the gear shaft of the driven gear set. By manually rotating the hand rocker, the driven gear set is driven to rotate, and then the double-threaded lead screw is driven to rotate, so as to realize the clamping or separation operation of the two clamping plates, ensuring the continuous progress of the pressing work.

10. The usage method of a pressing device based on a double-helix lead screw according to claim 8, characterized in that: After the machining of the workpiece is completed, the following steps are carried out: Pressure reduction operation: Control the torque motor to reverse. Through the transmission of the driving gear, the driven gear set and the double-threaded lead screw gear set, multiple double-threaded lead screws rotate synchronously in the opposite direction, and the two clamping plates move away from each other symmetrically along the lead screw, reducing the pressure on the workpiece. Take out the workpiece: When the distance between the clamping plates is large enough, take out the machined workpiece from between the two clamping plates. Position reset: Rotate the single-threaded lead screw on the guide rail again to adjust the moving mechanism to the initial position, preparing for the next pressing operation.

Images