Positive electrode / spray head separated double-Z-axis electrofluid micro-jet 3D printing device

Abstract

The invention discloses a positive electrode / spray head separated double-Z-axis electrofluid micro-jet 3D printing device which comprises a double-Z-axis lifting mechanism, an injection pump, an injector and a positive electrode and spray head separation assembly. The double-Z-axis lifting mechanism comprises an electric Z-axis lifting assembly and a hand wheel lead screw Z-axis lifting assembly. The injection pump is installed at the lifting end of the hand wheel lead screw Z-axis lifting assembly. The injector is mounted on the injection pump through a clamp; the anode nozzle separation assembly comprises a metal nozzle, an insulating interlayer and a metal anode structure; the metal nozzle is installed at the bottom of the injector, and the metal anode structure is installed at the lifting end of the hand wheel lead screw Z-axis lifting assembly through the insulation installation frame. The distance between the metal spray head and the receiving substrate can be conveniently adjusted, the problems of spray head blockage, excessive material supply and the like can be solved at any time in the electrofluid micro-jet process, meanwhile, the breakdown phenomenon is remarkably reduced, the electrofluid micro-jet process stability is guaranteed, and the printing effect and quality are improved.

Description

Technical Field

[0001] The present invention relates to the technical field of electrofluid microjet 3D printing, and in particular to a double Z-axis electrofluid microjet 3D printing device with separated positive electrode and nozzle. Background Art

[0002] Electrofluid microjet 3D printing is a new type of micro-nano additive manufacturing technology with the advantages of low cost, high precision, and a wide range of printing materials. In the implementation of electrofluid microjet 3D printing technology, there are many process parameters that affect the accuracy and quality of printed graphics, such as the distance between the nozzle and the substrate, the size of the supply voltage, and the moving speed of the three-dimensional motion system.

[0003] At present, the existing electrofluidic micro-jet 3D printing system usually requires pre-programming to set the distance between the nozzle and the substrate, and the printing distance can only be adjusted through a predetermined program during the printing process. During the process implementation, it is necessary to adjust the height of the print nozzle at any time to solve problems such as nozzle blockage and excessive supply of materials. The method of pre-setting the program to adjust the printing height cannot meet the process requirements of adjusting the printing height at any time. In addition, the common positive electrode connection method is to fix it directly to the print nozzle. When printing with high conductivity materials, the fibers may generate a higher internal current, resulting in a process "breakdown" phenomenon, which affects the effect and quality of electrofluidic micro-jet printing.

[0004] To this end, a dual Z-axis electrofluid micro-jet 3D printing device with separated cathode / nozzle was proposed. Summary of the invention

[0005] The purpose of the present invention is to provide a dual Z-axis electrofluid micro-jet 3D printing device with separated positive electrode / nozzle, aiming to solve or improve at least one of the above-mentioned technical problems.

[0006] To achieve the above object, the present invention provides the following solution: The present invention provides a dual Z-axis electrofluid micro-jet 3D printing device with separated positive electrode / nozzle, comprising:

[0007] A double Z-axis lifting mechanism, the double Z-axis lifting mechanism comprising an electric Z-axis lifting assembly and a handwheel and screw Z-axis lifting assembly, the handwheel and screw Z-axis lifting assembly being installed at the lifting end of the electric Z-axis lifting assembly;

[0008] A syringe pump, the syringe pump being mounted on the lifting end of the handwheel screw Z-axis lifting assembly;

[0009] A syringe, wherein the syringe is mounted on the syringe pump via a clamp;

[0010] A positive electrode nozzle separation component, the positive electrode nozzle separation component comprises a metal nozzle, an insulating barrier and a metal positive electrode structure; the metal nozzle is mounted at the bottom of the syringe, the metal positive electrode structure is used to connect a high voltage power supply; the metal positive electrode structure is mounted on the lifting end of the handwheel screw Z-axis lifting component through an insulating mounting frame;

[0011] The metal positive electrode structure is sleeved outside the insulating barrier and has an interference fit with the insulating barrier; the metal nozzle penetrates the insulating barrier, and the bottom of the metal nozzle extends out of the insulating barrier.

[0012] According to a dual Z-axis electrofluid micro-jet 3D printing device with separated positive electrode / nozzle provided by the present invention, the electric Z-axis lifting assembly comprises:

[0013] A gantry support, on which a control system is installed;

[0014] A first Z-axis screw, wherein the first Z-axis screw is vertically mounted on the gantry support;

[0015] A ball screw slide, wherein the ball screw slide is slidably sleeved on the first Z-axis screw;

[0016] A servo motor, wherein the servo motor is mounted on the gantry bracket, and an output shaft of the servo motor is connected to the first Z-axis lead screw shaft through a coupling;

[0017] Wherein, the servo motor is electrically connected to the control system, and the handwheel screw Z-axis lifting assembly is installed on the ball screw slide.

[0018] According to a dual Z-axis electrofluid micro-spray 3D printing device with separated positive electrode / nozzle provided by the present invention, the hand wheel screw Z-axis lifting assembly comprises:

[0019] A handwheel screw pad, the handwheel screw pad being mounted on the ball screw slide;

[0020] A handwheel screw, the handwheel screw is vertically mounted on the handwheel screw pad; a sliding sleeve is provided on the handwheel screw;

[0021] Wherein, the injection pump and the insulating mounting frame are both mounted on the sliding sleeve.

[0022] According to a dual Z-axis electrofluid micro-jet 3D printing device with separated positive electrode / nozzle provided by the present invention, a syringe pump mounting bracket is installed on the sliding sleeve, and the syringe pump and the insulating mounting bracket are both installed on the sliding sleeve through the syringe pump mounting bracket, and the syringe pump mounting bracket is adapted to the size of the syringe pump.

[0023] According to a dual Z-axis electrofluid micro-spray 3D printing device with separated positive electrode / nozzle provided by the present invention, a positive electrode protective shell is nested outside the metal positive electrode structure, the metal nozzle penetrates and extends out of the positive electrode protective shell, and the distance between the bottom of the metal nozzle and the bottom wall of the positive electrode protective shell is 1 mm to 2 mm.

[0024] According to a dual Z-axis electrofluid micro-spray 3D printing device with separated positive electrode / nozzle provided by the present invention, the insulating spacer is a cylindrical structure, and a through hole is opened at the center of the top surface of the insulating spacer, and the inner diameter of the through hole is 0.1mm~0.7mm; the outer diameter of the insulating spacer is 1mm~3mm.

[0025] According to the dual Z-axis electrofluid micro-spray 3D printing device with separated positive electrode and nozzle provided by the present invention, the insulating mounting frame is made of acrylic plate.

[0026] According to a dual Z-axis electrofluid micro-spray 3D printing device with separated positive electrode / nozzle provided by the present invention, the insulating spacer and the positive electrode protective shell are both made of high-resistance materials, and the high-resistance materials include but are not limited to ceramics, glass, polytetrafluoroethylene and polyimide.

[0027] According to a dual Z-axis electrofluid micro-jet 3D printing device with separated positive electrode / nozzle provided by the present invention, the metal positive electrode structure is made of metal conductive material, and the metal conductive material includes but is not limited to copper, silver, gold, iron, aluminum and nickel.

[0028] According to a positive electrode / nozzle separated dual Z-axis electrofluid micro-spray 3D printing device provided by the present invention, the handwheel screw pad is installed on the ball screw slide by bolts, and bearing seats are installed at both ends of the handwheel screw, and the two bearing seats are respectively installed on the handwheel screw pad by fixing bolts.

[0029] The present invention discloses the following technical effects:

[0030] The dual Z-axis lifting mechanism of the present invention includes two same-direction lead screw feeds to coordinately control the movement in the Z-axis direction. By means of electric plus hand wheel rotation, the distance between the metal nozzle and the receiving substrate can be adjusted very conveniently, which is helpful to adjust the nozzle blockage, excessive material supply and other problems at any time during the electrofluid micro-spraying process;

[0031] When printing high-conductivity materials, the present invention uses an insulating layer to cover the outside of the metal nozzle, applies a high voltage to the metal positive electrode structure, and uses the insulating layer to separate the metal nozzle from the metal positive electrode structure, thereby greatly reducing the internal current density of the printed thallus, significantly reducing the occurrence of the "breakdown" phenomenon, ensuring the process stability of the electrofluidic micro-spraying, improving the printing effect and quality, and providing more options for electrofluidic micro-spraying 3D printing to manufacture high-conductivity materials;

[0032] In the present invention, the syringe is mounted on the syringe pump through a clamp, and the syringe pump directly pushes the syringe and the metal nozzle to provide printing materials, avoiding the use of an infusion pipeline, which helps to improve the accuracy of material supply; at the same time, only using the syringe and the metal nozzle facilitates the cleaning and maintenance of the system, avoiding the cleaning of the infusion pipeline after the process operation;

[0033] The present invention can improve the operational convenience and process stability of electrofluid micro-jet 3D printing, promote micro-nano manufacturing of high-conductivity materials, and has broad application value in the fields of flexible electronics, energy devices, etc. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. 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 creative work.

[0035] Figure 1 It is a structural schematic diagram of the present invention;

[0036] Figure 2 It is a schematic diagram of the installation of the cathode nozzle separation component and the injector in the present invention;

[0037] Figure 3 for Figure 2 Sectional view of AA in the middle;

[0038] Figure 4 It is an axonometric diagram of the metal positive electrode structure in the present invention;

[0039] Figure 5 It is an axonometric view of the positive electrode protective shell in the present invention.

[0040] Among them, 1. ball screw slide; 2. handwheel screw pad; 3. handwheel screw; 4. injection pump mounting bracket; 5. injection pump; 6. syringe; 7. metal nozzle; 8. insulating barrier; 9. metal positive electrode structure; 10. positive electrode protective shell; 11. insulating mounting bracket. DETAILED DESCRIPTION

[0041] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0042] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0043] Reference Figure 1-Figure 5 The present invention provides a dual Z-axis electrofluid micro-jet 3D printing device with separated positive electrode and nozzle, comprising:

[0044] Double Z-axis lifting mechanism, the double Z-axis lifting mechanism includes an electric Z-axis lifting assembly and a handwheel screw Z-axis lifting assembly, and the handwheel screw Z-axis lifting assembly is installed at the lifting end of the electric Z-axis lifting assembly;

[0045] The injection pump 5 is installed at the lifting end of the hand wheel screw Z axis lifting assembly;

[0046] A syringe 6, wherein the syringe 6 is mounted on the syringe pump 5 through a clamp;

[0047] A positive electrode nozzle separation component, the positive electrode nozzle separation component includes a metal nozzle 7, an insulating barrier 8 and a metal positive electrode structure 9; the metal nozzle 7 is installed at the bottom of the syringe 6, and the metal positive electrode structure 9 is used to connect a high-voltage power supply to provide the electric field required for the electrofluid micro-spraying process; the metal positive electrode structure 9 is installed at the lifting end of the handwheel screw Z-axis lifting assembly through an insulating mounting frame 11;

[0048] The metal positive electrode structure 9 is sleeved outside the insulating barrier 8 and has an interference fit with the insulating barrier 8; the metal nozzle 7 penetrates the insulating barrier 8, and the bottom extends out of the insulating barrier 8;

[0049] In this way, the dual Z-axis lifting mechanism of the present invention includes two same-direction lead screw feeds to coordinately control the movement in the Z-axis direction. By means of electric plus hand wheel rotation, the distance between the metal nozzle 7 and the receiving substrate can be adjusted very conveniently, which is helpful to adjust the nozzle blockage, excessive material supply and other problems at any time during the electrofluid micro-spraying process;

[0050] When printing high-conductivity materials, the present invention uses an insulating layer 8 to cover the outside of the metal nozzle 7, applies a high voltage to the metal positive electrode structure 9, and uses the insulating layer 8 to separate the metal nozzle 7 from the metal positive electrode structure 9, thereby greatly reducing the internal current density of the printed thallus, significantly reducing the occurrence of the "breakdown" phenomenon, ensuring the process stability of the electrofluidic micro-spraying, improving the printing effect and quality, and providing more options for electrofluidic micro-spraying 3D printing to manufacture high-conductivity materials;

[0051] In the present invention, the syringe 6 is mounted on the syringe pump 5 by a clamp, and the syringe pump 5 directly pushes the syringe 6 and the metal nozzle 7 to provide printing materials, avoiding the use of an infusion pipeline, which helps to improve the accuracy of material supply; at the same time, only using the syringe 6 and the metal nozzle 7 facilitates the cleaning and maintenance of the system, avoiding the cleaning of the infusion pipeline after the process operation;

[0052] The present invention can improve the operational convenience and process stability of electrofluid micro-jet 3D printing, promote micro-nano manufacturing of high-conductivity materials, and has broad application value in the fields of flexible electronics, energy devices, etc.

[0053] To further optimize the solution, the electric Z-axis lifting components include:

[0054] A gantry bracket is provided with a control system; in this embodiment, the control system uses a computer, and the computer controls the rotation of the servo motor of the ball screw slide 1 to control the movement of the Z axis;

[0055] A first Z-axis lead screw, the first Z-axis lead screw is vertically mounted on the gantry bracket;

[0056] A ball screw slide 1, wherein the ball screw slide 1 is slidably sleeved on the first Z-axis screw;

[0057] A servo motor, wherein the servo motor is mounted on the gantry bracket, and an output shaft of the servo motor is connected to the first Z-axis lead screw shaft through a coupling;

[0058] The servo motor is electrically connected to the control system, and the handwheel screw Z-axis lifting assembly is installed on the ball screw slide 1.

[0059] To further optimize the solution, the handwheel and screw Z-axis lifting assembly includes:

[0060] A handwheel screw pad 2, the handwheel screw pad 2 is mounted on the ball screw slide 1;

[0061] A handwheel screw 3 is vertically mounted on the handwheel screw pad 2; a sliding sleeve is provided on the handwheel screw 3;

[0062] Wherein, the injection pump 5 and the insulating mounting frame 11 are both mounted on the sliding sleeve;

[0063] The handwheel screw 3 can be manually rotated to achieve screw feeding. After the electric Z-axis lifting assembly stops moving, the Z-axis height can be manually adjusted and the process at the metal nozzle 7 can be performed.

[0064] To further optimize the solution, a syringe pump mounting frame 4 is installed on the sliding sleeve, and the syringe pump 5 and the insulating mounting frame 11 are both installed on the sliding sleeve through the syringe pump mounting frame 4, and the syringe pump mounting frame 4 is adapted to the size of the syringe pump 5; the syringe pump mounting frame 4 is customized according to the appearance and structure of the syringe pump 5; the syringe 6 is a commercial standard syringe, and different volumes can be selected according to the volume of the material, including 1 ml, 2 ml, 3 ml, 5 ml, 10 ml, etc.

[0065] According to a further optimization scheme, a positive electrode protective shell 10 is embedded outside the metal positive electrode structure 9, the metal nozzle 7 penetrates through and extends out of the positive electrode protective shell 10, and the distance between the bottom of the metal nozzle 7 and the bottom wall of the positive electrode protective shell 10 is 1 mm to 2 mm.

[0066] According to a further optimization scheme, the insulating barrier 8 is a cylindrical structure, and a through hole is opened at the center of the top surface of the insulating barrier 8. The inner diameter of the through hole is 0.1 mm to 0.7 mm, depending on the outer diameter of the metal nozzle 7 used; the outer diameter of the insulating barrier 8 is 1 mm to 3 mm.

[0067] To further optimize the solution, the insulating mounting frame 11 is made of acrylic plate and is used to fix the positive nozzle separation assembly and ensure the insulation of the entire dual Z-axis lifting mechanism to avoid the risk of electric shock during printing operation.

[0068] Further optimizing the solution, the insulating barrier 8 and the positive electrode protective shell 10 are made of high-resistance materials, and the high-resistance materials include but are not limited to ceramics, glass, polytetrafluoroethylene and polyimide;

[0069] The insulating barrier 8 can prevent the current from moving from the metal positive electrode structure 9 to the metal nozzle 7; the positive electrode protective shell 10 is divided into two parts, which are used to wrap the metal positive electrode structure 9 to ensure operational safety.

[0070] As a further optimization solution, the metal positive electrode structure 9 is made of a metal conductive material, and the metal conductive material includes but is not limited to copper, silver, gold, iron, aluminum and nickel.

[0071] According to a further optimized solution, the handwheel screw pad 2 is mounted on the ball screw slide 1 by bolts, bearing seats are mounted on both ends of the handwheel screw 3, and the two bearing seats are respectively mounted on the handwheel screw pad 2 by fixing bolts.

[0072] Further optimization scheme, in the present invention, the syringe pump 5 is installed vertically on the Z axis, directly pushing the syringe 5 and the metal nozzle 7 to provide printing materials. This design avoids the use of infusion pipelines, which helps to improve the accuracy of material supply. At the same time, only using the syringe 5 and the metal nozzle 7 facilitates the cleaning and maintenance of the system, avoiding the cleaning of the infusion pipeline after the process operation.

[0073] The present invention also provides a method for using a dual Z-axis electrofluid micro-jet 3D printing device with separated positive electrode / nozzle, comprising the following steps:

[0074] 1) Install the prepared printing material solution on the fixture of the syringe pump 5, set the inner diameter and specifications of the syringe 6 on the control panel of the syringe pump 5; then set the supply speed value so that the printing material can flow out of the metal nozzle 7 stably;

[0075] 2) The metal positive electrode structure 9 is connected with the insulating barrier 8 by interference fit, and the positive electrode protection shell 10 is nested outside the metal positive electrode structure 9; the insulating mounting frame 11 is connected with the injection pump mounting frame 4 by fixing bolts; the metal nozzle 7 is inserted into the matched insulating barrier 8, the metal positive electrode structure 9, and the positive electrode protection shell 10, and 1mm to 2mm is left at the end of the metal nozzle 7; the metal positive electrode structure 9 is connected with the insulating mounting frame 11 by fixing bolts, and after this installation is completed, there is no need to disassemble;

[0076] 3) Enter the specified G code through the computer to start printing; enter the voltage value on the computer through the DC high-voltage power supply software; change the distance between the metal nozzle 7 and the receiving substrate by adjusting the handwheel screw 3. After obtaining a suitable receiving distance, Thales can be stably formed and fiber injection can be generated, thereby achieving an ideal printing effect; the computer controls the automatic lifting of a specific printing height after printing each layer;

[0077] 4) After printing is completed, stop the solution supply of the syringe pump 5, turn off the high voltage power supply, and slowly remove the syringe 6 from the syringe pump 5; record the value of the handwheel screw 3, and adjust the handwheel screw 3 to the originally set "zero point" value to facilitate the next adjustment and recording of the value;

[0078] 5) Clean the syringe 6 and keep the work surface clean.

[0079] In the description of the present invention, it should be understood that the terms "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside" and "outside" etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0080] Obviously, the above embodiments of the present invention are merely examples for clearly explaining the present invention, and are not intended to limit the implementation methods of the present invention. For ordinary technical users in the relevant field, other different forms of changes or modifications can be made on the basis of the above description. It is not necessary and impossible to list all the implementation methods here. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the claims of the present invention.

Claims

1. A dual Z-axis electrofluid microjet 3D printing device with separated positive electrode / nozzle, characterized in that: include: A double Z-axis lifting mechanism, the double Z-axis lifting mechanism comprising an electric Z-axis lifting assembly and a handwheel and screw Z-axis lifting assembly, the handwheel and screw Z-axis lifting assembly being installed at the lifting end of the electric Z-axis lifting assembly; An injection pump (5), the injection pump (5) being mounted at the lifting end of the hand wheel screw Z-axis lifting assembly; A syringe (6), wherein the syringe (6) is mounted on the syringe pump (5) via a clamp; A positive electrode nozzle separation component, the positive electrode nozzle separation component comprising a metal nozzle (7), an insulating barrier (8) and a metal positive electrode structure (9); the metal nozzle (7) is mounted at the bottom of the syringe (6), the metal positive electrode structure (9) is used to connect a high-voltage power supply; the metal positive electrode structure (9) is mounted on the lifting end of the handwheel screw Z-axis lifting component through an insulating mounting frame (11); The metal positive electrode structure (9) is sleeved outside the insulating barrier (8) and is interference fit with the insulating barrier (8); the metal nozzle (7) penetrates the insulating barrier (8) and the bottom thereof extends out of the insulating barrier (8).

2. The dual Z-axis electrofluid micro-jet 3D printing device with separated positive electrode and nozzle according to claim 1, characterized in that: The electric Z-axis lifting assembly comprises: A gantry support, on which a control system is installed; A first Z-axis screw, wherein the first Z-axis screw is vertically mounted on the gantry support; A ball screw slide (1), wherein the ball screw slide (1) is slidably sleeved on the first Z-axis screw; A servo motor, wherein the servo motor is mounted on the gantry bracket, and an output shaft of the servo motor is connected to the first Z-axis lead screw shaft through a coupling; Wherein, the servo motor is electrically connected to the control system, and the handwheel screw Z-axis lifting assembly is installed on the ball screw slide (1).

3. The dual Z-axis electrofluid micro-jet 3D printing device with separated positive electrode and nozzle according to claim 2, characterized in that: The hand wheel screw Z axis lifting assembly comprises: A handwheel screw pad (2), wherein the handwheel screw pad (2) is mounted on the ball screw slide (1); A handwheel screw (3), wherein the handwheel screw (3) is vertically mounted on the handwheel screw pad (2); a sliding sleeve is provided on the handwheel screw (3); Wherein, the injection pump (5) and the insulating mounting frame (11) are both mounted on the sliding sleeve.

4. The dual Z-axis electrofluid micro-jet 3D printing device with separated positive electrode and nozzle according to claim 3, characterized in that: An injection pump mounting frame (4) is mounted on the sliding sleeve, and the injection pump (5) and the insulating mounting frame (11) are both mounted on the sliding sleeve via the injection pump mounting frame (4), and the injection pump mounting frame (4) is adapted to the size of the injection pump (5).

5. The dual Z-axis electrofluid micro-jet 3D printing device with separated positive electrode and nozzle according to claim 1, characterized in that: A positive electrode protection shell (10) is nested outside the metal positive electrode structure (9), the metal nozzle (7) penetrates through and extends out of the positive electrode protection shell (10), and the distance between the bottom of the metal nozzle (7) and the bottom wall of the positive electrode protection shell (10) is 1 mm to 2 mm.

6. The dual Z-axis electrofluid micro-jet 3D printing device with separated positive electrode and nozzle according to claim 1, characterized in that: The insulating interlayer (8) is a cylindrical structure, and a through hole is provided at the center of the top surface of the insulating interlayer (8), the inner diameter of the through hole is 0.1 mm to 0.7 mm; the outer diameter of the insulating interlayer (8) is 1 mm to 3 mm.

7. The dual Z-axis electrofluid micro-jet 3D printing device with separated positive electrode and nozzle according to claim 1, characterized in that: The insulating mounting frame (11) is made of an acrylic plate.

8. The dual Z-axis electrofluid micro-jet 3D printing device with separated positive electrode and nozzle according to claim 5, characterized in that: The insulating barrier (8) and the positive electrode protective shell (10) are both made of high-resistance materials, and the high-resistance materials include but are not limited to ceramics, glass, polytetrafluoroethylene and polyimide.

9. The dual Z-axis electrofluid micro-jet 3D printing device with separated positive electrode and nozzle according to claim 1, characterized in that: The metal positive electrode structure (9) is made of a metal conductive material, and the metal conductive material includes but is not limited to copper, silver, gold, iron, aluminum and nickel.

10. The dual Z-axis electrofluid micro-jet 3D printing device with separated positive electrode and nozzle according to claim 3, characterized in that: The handwheel screw pad (2) is mounted on the ball screw slide (1) by means of bolts, and bearing seats are mounted on both ends of the handwheel screw (3), and the two bearing seats are respectively mounted on the handwheel screw pad (2) by means of fixing bolts.

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