Double-spring guide shaft precision driving module

Abstract

The utility model discloses a double-spring guide shaft precision driving module, which comprises a fixed bracket, a movable push plate and a stepping motor, wherein the movable push plate moves up and down relative to the fixed bracket, the stepping motor is arranged on the fixed bracket, a rotor part of the stepping motor is provided with a driving screw rod, and a guide shaft guide pair is arranged between the movable push plate and the fixed bracket; the movable push plate is provided with a push plate internal threaded hole which is vertically through and corresponds to the driving screw rod, the driving screw rod penetrates through the push plate internal threaded hole, and an external thread of the driving screw rod is meshed with an internal thread of the inner wall of the push plate internal threaded hole; two compression springs which are arranged in a left-right spaced mode are arranged below the movable push plate, one compression spring is located on the left side of the driving screw, and the other compression spring is located on the right side of the driving screw; the upper end of each compression spring elastically abuts against the movable push plate, and the lower end of each compression spring elastically abuts against the fixed bracket. By means of the structural design, the moving mechanism has the advantages of being novel in structural design and high in moving precision.

Description

Technical Field

[0001] The utility model relates to the technical field of motor drive modules, in particular to a double-spring guide shaft precision drive module. Background Art

[0002] The patent number is: ZL201720399162.6, and the patent name is: A Chinese utility model patent for a metal screw-driven stepper motor, which essentially discloses a guide shaft precision drive module; specifically, the metal screw-driven stepper motor includes a drive motor and a fixed bracket, the drive motor is fastened to the fixed bracket, the front end of the rotating shaft of the drive motor is connected to a coaxially arranged metal screw, the front end fixing plate of the fixed bracket is corresponding to the front end of the metal screw and is equipped with a front end bearing, and the front end of the metal screw is inserted into the center hole of the front end bearing; the rear end face of the housing of the drive motor is equipped with a housing cover plate, and the middle position of the housing cover plate is provided with a completely through-the-front and rear The cover plate mounting hole is embedded with a rear end bearing, a blind hole opening forward is provided in the middle position of the front surface of the rear end bearing, the rear end portion of the rotating shaft of the driving motor is inserted into the blind hole of the rear end bearing, a spring sheet is provided on the rear surface of the shell cover plate, the spring sheet is provided with an elastic pressing portion protruding and extending forward, and the elastic pressing portion of the spring sheet presses the rear end bearing forward; the fixed bracket is equipped with a movable shift block and an optical axis located beside the movable shift block, the movable shift block is provided with a shift block mounting hole that completely penetrates from front to back, a nut is embedded in the shift block mounting hole, and the nut cooperates with the metal screw; the movable shift block is provided with a guide hole corresponding to the optical axis, and the optical axis is embedded in the guide hole of the movable shift block.

[0003] When the above-mentioned metal screw drive stepper motor is working, the rotating shaft of the driving motor drives the metal screw to rotate. Since the movable shift block cooperates with the metal screw through the nut, the rotating metal screw drives the movable shift block to move forward and backward, and the movable shift block can drive the corresponding moving part to move; in the process of the movable shift block moving horizontally forward and backward, the movable shift block cooperates with the optical axis through the guide hole to realize horizontal movement guidance, and the movement is smooth and high-precision.

[0004] It should be pointed out that the above-mentioned metal screw drive stepper motor has the following defects. Specifically, the metal screw and the nut are connected by threaded engagement. Since there is still an engagement gap in the threaded engagement, the above-mentioned transmission method has the problem of low movement accuracy. Utility Model Content

[0005] The utility model aims to provide a double spring guide shaft precision drive module, which has novel structural design and high moving precision.

[0006] In order to achieve the above-mentioned purpose, the utility model is implemented through the following technical solutions.

[0007] A double spring guide shaft precision drive module comprises a fixed bracket, a movable push plate that moves up and down relative to the fixed bracket, and a stepper motor installed on the fixed bracket. The rotor part of the stepper motor is provided with a vertically arranged driving screw. A guide shaft guide pair is installed between the movable push plate and the fixed bracket.

[0008] The movable push plate is provided with a push plate internal thread hole which penetrates vertically corresponding to the driving screw rod, the driving screw rod passes through the push plate internal thread hole, and the external thread of the driving screw rod is meshed with the internal thread of the inner wall of the push plate internal thread hole;

[0009] Two compression springs are arranged at intervals on the left and right sides, one of which is located on the left side of the driving screw rod, and the other is located on the right side of the driving screw rod;

[0010] The upper end of each compression spring is elastically abutted against the movable push plate, and the lower end of each compression spring is elastically abutted against the fixed bracket.

[0011] The guide shaft guide pair includes two guide shafts which are arranged at intervals on the left and right and extend vertically respectively, and each guide shaft is fastened and mounted on the fixed bracket respectively;

[0012] The movable push plate is provided with a push plate hole vertically penetrating therefrom corresponding to each guide shaft, and each guide shaft passes through the corresponding push plate hole;

[0013] The two compression springs are respectively sleeved on the periphery of the guide shaft at the corresponding side.

[0014] Among them, one of the push plate holes is a cylindrical hole, and the other push plate hole is a U-shaped slot hole with a side opening.

[0015] The fixed bracket includes a bracket bottom plate, a bracket vertical plate arranged on the bracket bottom plate and extending vertically upward, and a bracket top plate arranged on the upper edge of the bracket vertical plate;

[0016] The housing of the stepper motor is fixedly mounted on the lower surface of the bracket bottom plate, the upper end of each guide shaft is connected to the bracket top plate, the lower end of each guide shaft is connected to the bracket bottom plate, and the lower end of each compression spring is abutted against the bracket bottom plate.

[0017] Wherein, the upper end portion of the driving screw is rotatably connected to the bracket top plate through a bearing.

[0018] Wherein, the bracket bottom plate, the bracket vertical plate and the bracket vertical plate are an integrated structure.

[0019] Compared with the prior art, the utility model has the following beneficial effects, specifically: during the lifting and lowering of the movable push plate, the two compression springs elastically push the movable push plate upwards respectively, and under the elastic force of the two compression springs, the external thread of the driving screw and the internal thread of the inner wall of the internal thread hole of the push plate fit tightly, so that the thread meshing clearance of the threaded transmission pair can be effectively eliminated, and when the rotating driving screw drives the movable push plate to lift and lower, the return difference of the movable push plate can be effectively reduced and the precision of the longitudinal lifting and lowering of the movable push plate can be improved. Therefore, the double spring guide shaft precision drive module of the utility model has the advantages of novel structural design and high movement precision. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The present invention is further described below with reference to the accompanying drawings, but the embodiments in the accompanying drawings do not constitute any limitation to the present invention.

[0021] Figure 1 It is a structural schematic diagram of the utility model.

[0022] Figure 2 It is a partially enlarged schematic diagram of the utility model.

[0023] Figure 3 It is a cross-sectional schematic diagram of the utility model.

[0024] exist Figures 1 to 3 Included are:

[0025] 1-fixed bracket; 11-bracket bottom plate; 12-bracket vertical plate; 13-bracket top plate; 2-movable push plate; 21-pushing plate internal threaded hole; 22-cylindrical hole; 23-U-shaped slot hole; 3-stepping motor; 4-driving screw; 5-guide shaft guide pair; 51-guide shaft; 6-compression spring; 7-bearing. DETAILED DESCRIPTION

[0026] The present invention will be described below in conjunction with specific implementation methods.

[0027] Embodiment 1, as Figures 1 to 3 As shown, a double spring guide shaft precision drive module includes a fixed bracket 1, a movable push plate 2 that moves up and down relative to the fixed bracket 1, and a stepper motor 3 installed on the fixed bracket 1. The rotor part of the stepper motor 3 is provided with a vertically arranged driving screw 4, and a guide shaft guide pair 5 is installed between the movable push plate 2 and the fixed bracket 1.

[0028] Among them, Figure 3 As shown, the movable push plate 2 is provided with a vertically penetrating push plate internal thread hole 21 corresponding to the driving screw 4, the driving screw 4 passes through the push plate internal thread hole 21, and the external thread of the driving screw 4 is meshed with the internal thread of the inner wall of the push plate internal thread hole 21.

[0029] Further, such as Figures 1 to 3 As shown, two compression springs 6 are installed at intervals on the left and right below the movable push plate 2, one of the compression springs 6 is located on the left side of the driving screw 4, and the other compression spring 6 is located on the right side of the driving screw 4; the upper end of each compression spring 6 elastically abuts against the movable push plate 2, and the lower end of each compression spring 6 elastically abuts against the fixed bracket 1.

[0030] During the lifting and lowering movement of the movable push plate 2 in the first embodiment of the present invention, the stepper motor 3 rotates, and since the external thread of the driving screw 4 is engaged with the internal thread of the inner wall of the internal threaded hole 21 of the push plate, the stepper motor 3 drives the movable push plate 2 to lift and lower through the threaded transmission pair composed of the driving screw 4 and the internal threaded hole 21 of the push plate.

[0031] It should be pointed out that during the lifting and lowering movement of the movable push plate 2, the two compression springs 6 elastically push the movable push plate 2 upward respectively. Under the elastic force of the two compression springs 6, the external thread of the driving screw 4 is tightly fitted with the internal thread of the inner wall of the push plate internal thread hole 21, thereby effectively eliminating the thread engagement clearance of the threaded transmission pair. When the rotating driving screw 4 drives the movable push plate 2 to lift and move, the return difference of the movable push plate 2 can be effectively reduced and the accuracy of the longitudinal lifting and lowering movement of the movable push plate 2 can be improved.

[0032] Based on the above, it can be seen that through the above structural design, the double spring guide shaft precision drive module of the first embodiment has the advantages of novel structural design and high movement accuracy.

[0033] Embodiment 2, as Figures 1 to 3 As shown, the difference between the second embodiment and the first embodiment is that the guide shaft guide pair 5 includes two guide shafts 51 which are arranged at intervals on the left and right and extend vertically respectively, and each guide shaft 51 is fastened and installed on the fixing bracket 1 respectively.

[0034] The movable push plate 2 is provided with vertically penetrating push plate holes corresponding to the guide shafts 51 , and the guide shafts 51 pass through the corresponding push plate holes.

[0035] In addition, two compression springs 6 are respectively mounted on the outer periphery of the guide shaft 51 on the corresponding side.

[0036] When the stepper motor 3 drives the movable push plate 2 to move longitudinally up and down, the two guide shafts 51 cooperate with the corresponding push plate holes respectively. The guide shaft guide pair 5 can effectively guide the movable push plate 2 to accurately move longitudinally up and down, and reduce the amount of shaking when the movable push plate 2 drives the load to move.

[0037] Embodiment three, as Figures 1 to 3As shown, the difference between the third embodiment and the second embodiment is that one of the push plate holes is a cylindrical hole 22, and the other push plate hole is a U-shaped slot hole 23 with a side opening.

[0038] It should be explained that, for the U-shaped slot 23 of the third embodiment, it can effectively eliminate the tolerance problem caused by processing. While reducing the longitudinal lifting and moving shaking amount of the movable push plate 2, this structural design can effectively reduce the processing cost.

[0039] Embodiment 4, as Figures 1 to 3 As shown, the difference between the fourth embodiment and the second embodiment is that the fixed bracket 1 includes a bracket bottom plate 11 , a bracket vertical plate 12 disposed on the bracket bottom plate 11 and extending vertically upward, and a bracket top plate 13 disposed on the upper edge of the bracket vertical plate 12 .

[0040] The fixing bracket 1 of the fourth embodiment may be a metal bracket, and the bracket bottom plate 11, the bracket vertical plate 12, and the bracket top plate 13 are an integrated structure.

[0041] In addition, the shell of the stepper motor 3 is fastened to the lower surface of the bracket base plate 11, the upper end of each guide shaft 51 is connected to the bracket top plate 13, the lower end of each guide shaft 51 is connected to the bracket base plate 11, and the lower end of each compression spring 6 is abutted against the bracket base plate 11.

[0042] In addition, the upper end of the driving screw 4 is rotatably connected to the bracket top plate 13 through the bearing 7.

[0043] The above contents are only preferred embodiments of the present invention. For ordinary technicians in this field, according to the concept of the present invention, there will be changes in the specific implementation methods and application scopes. The contents of this specification should not be understood as limiting the present invention.

Claims

1. A double spring guide shaft precision drive module, comprising a fixed bracket (1), a movable push plate (2) movable relative to the fixed bracket (1), and a stepper motor (3) mounted on the fixed bracket (1), wherein the rotor portion of the stepper motor (3) is provided with a vertically arranged drive screw (4), and a guide shaft guide pair (5) is arranged between the movable push plate (2) and the fixed bracket (1); The movable push plate (2) is provided with a push plate internal thread hole (21) which passes vertically corresponding to the driving screw rod (4), the driving screw rod (4) passes through the push plate internal thread hole (21), and the external thread of the driving screw rod (4) is meshed with the internal thread of the inner wall of the push plate internal thread hole (21); Features: Two compression springs (6) are arranged at intervals on the left and right sides below the movable push plate (2), one of the compression springs (6) is located on the left side of the driving screw rod (4), and the other compression spring (6) is located on the right side of the driving screw rod (4); The upper end of each compression spring (6) elastically contacts the movable push plate (2), and the lower end of each compression spring (6) elastically contacts the fixed bracket (1).

2. A double spring guide shaft precision drive module according to claim 1, characterized in that: The guide shaft guide pair (5) comprises two guide shafts (51) arranged at intervals on the left and right and extending vertically respectively, and each guide shaft (51) is respectively fixedly mounted on the fixed bracket (1); The movable push plate (2) is provided with a push plate hole corresponding to each guide shaft (51) and extending vertically therethrough, and each guide shaft (51) passes through the corresponding push plate hole; The two compression springs (6) are respectively sleeved on the periphery of the guide shaft (51) on the corresponding side.

3. A double spring guide shaft precision drive module according to claim 2, characterized in that: One of the push plate holes is a cylindrical hole (22), and the other push plate hole is a U-shaped slotted hole (23) opening laterally.

4. A double spring guide shaft precision drive module according to claim 2, characterized in that: The fixed bracket (1) comprises a bracket bottom plate (11), a bracket vertical plate (12) arranged on the bracket bottom plate (11) and extending vertically upward, and a bracket top plate (13) arranged on the upper edge of the bracket vertical plate (12); The housing of the stepper motor (3) is fixedly mounted on the lower surface of the bracket bottom plate (11), the upper end of each guide shaft (51) is connected to the bracket top plate (13), the lower end of each guide shaft (51) is connected to the bracket bottom plate (11), and the lower end of each compression spring (6) is in contact with the bracket bottom plate (11).

5. A double spring guide shaft precision drive module according to claim 4, characterized in that: The upper end of the driving screw rod (4) is rotatably connected to the bracket top plate (13) via a bearing (7).

6. A double spring guide shaft precision drive module according to claim 4, characterized in that: The bracket bottom plate (11), the bracket vertical plate (12), and the bracket vertical plate (12) are an integrated structure.

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