A lifting device for precisely controlling displacement accuracy

Abstract

The present invention relates to a lifting device for precisely controlling displacement accuracy, which comprises a base, a guide rail and a power assembly arranged on the base, wherein a plurality of guide rails are provided and each guide rail is arranged parallel to each other, a first slider, a second slider and a displacement adjusting member are sequentially sleeved on the guide rail from top to bottom, the first slider and the second slider can slide along the guide rail, the first slider and the second slider are connected by a traction member, the traction member comprises a limiting part and a connecting part sequentially arranged from top to bottom, the limiting part is located above the first slider, the connecting part passes through a through hole on the first slider and is fixedly connected to the second slider, the diameter of the through hole is larger than the connecting part, and the diameter of the through hole is smaller than the limiting part, the displacement adjusting member is located below the second slider, it is sleeved on the guide rail and can slide along the guide rail, and the power assembly is used to drive the first slider to slide along the guide rail. The lifting device for precisely controlling displacement accuracy has low production cost, simple and reliable adjustment method, high adjustment accuracy and small use error.

Description

Technical Field

[0001] The present invention relates to the technical field of lifting brackets, and in particular to a lifting device capable of accurately controlling displacement accuracy. Background Art

[0002] Instruments such as viscometers and rheometers that require repeated control of displacement accuracy usually need to be used in conjunction with a lifting bracket. In the prior art, there are two different types of lifting brackets: manual lifting and electric lifting. The production cost of manual lifting brackets is low, but the displacement control accuracy is low and the repeatability is poor. The displacement control accuracy of electric lifting brackets is higher than that of manual lifting brackets, but the displacement control accuracy of electric lifting brackets is determined by the motor drive control accuracy and the screw accuracy. Therefore, the higher the displacement control accuracy required for electric lifting brackets, the higher their production cost. Summary of the invention

[0003] In order to solve the above technical problems, the purpose of the present invention is to provide a lifting device that can accurately control the displacement accuracy. It does not rely on the motor drive control accuracy and the screw rod accuracy, can accurately control the displacement of the instrument, has high adjustment accuracy and good displacement repeatability, and at the same time is low in cost and easy to mass produce.

[0004] Based on this, the present invention provides a lifting device for accurately controlling displacement accuracy, which includes:

[0005] A base, wherein the base is provided with a plurality of guide rails parallel to each other;

[0006] a first slider, the first slider being sleeved on the guide rail and being able to slide along the guide rail, the first slider being provided with a through hole penetrating therethrough;

[0007] a second slider, the second slider being sleeved on the guide rail and being able to slide along the guide rail, and the second slider being located below the first slider;

[0008] A traction member, the traction member comprises a limiting portion and a connecting portion arranged in sequence from top to bottom, the limiting portion is located above the first slider, the connecting portion passes through the through hole and is fixedly connected to the second slider, the diameter of the through hole is larger than that of the connecting portion, and the diameter of the through hole is smaller than that of the limiting portion;

[0009] A displacement adjusting member, the displacement adjusting member is sleeved on the guide rail and can slide along the guide rail, and the displacement adjusting member is located below the second sliding block;

[0010] A power assembly is used to drive the first sliding block to slide along the guide rail.

[0011] In some embodiments of the present application, the power assembly includes a motor and a screw connected to an output end of the motor, the motor is disposed on the base, and the first slider is sleeved on the screw.

[0012] In some embodiments of the present application, a controller is provided on the side of the base, and the controller is electrically connected to the motor.

[0013] In some embodiments of the present application, a limit switch connected to the first sliding block is provided above the traction member, and the limit switch is electrically connected to the controller.

[0014] In some embodiments of the present application, a bracket is further included which is sleeved on the guide rail, and the bracket is located below the displacement adjustment member and can slide along the guide rail.

[0015] In some embodiments of the present application, the displacement adjustment member is threadedly connected to the guide rail.

[0016] In some embodiments of the present application, the connecting portion of the traction member is threadedly connected to the second sliding block.

[0017] In some embodiments of the present application, a plurality of support feet with adjustable height and inclination are provided at the bottom of the base.

[0018] In some embodiments of the present application, the first end of each guide rail is connected to the base, and the second end of each guide rail is connected to the top plate.

[0019] The lifting device for precisely controlling displacement accuracy provided by the embodiment of the present invention has the following beneficial effects compared with the prior art:

[0020] When in use, the test host of the viscometer or rheometer is fixed on the second slider, and the test base plate is fixed on the base, and the measuring rotor is also fixed on the second slider together with the measuring host. During the ascending process, the first slider slides upward along the guide rail under the drive of the power component, and as the first slider slides, the first slider contacts the limiting portion of the traction member, and the first slider continues to slide upward. The traction member slides upward under the drive of the first slider, and the second slider connected to the traction member also slides upward accordingly, so as to realize the upward displacement of the test host; further, during the descending process, the first slider slides downward along the guide rail under the drive of the power component, and under the action of gravity, the limiting portion of the traction member is close to the first sliding block, and the traction member and the second slider also move with the first slider The sliding of the block slides downward synchronously. Based on the setting of the displacement adjusting member, the second slider first contacts the displacement adjusting member during the downward sliding process. Due to the obstruction of the displacement adjusting member, the second slider and the traction member fixed thereon stop sliding at the same time. At this time, the first slider is still driven by the motor to continue to slide downward, and the limiting portion of the traction member disengages from the first slider and moves in the direction away from the first slider. As the displacement of the first slider sliding downward increases, the limiting portion of the traction member gradually moves away from the first slider. Finally, the limiting portion of the traction member contacts the limit switch above the first slider and triggers the limit switch. After the limit switch is triggered, the motor is controlled to stop running, and the first slider also stops sliding and falls on the second slider. The second slider thus accurately falls at the preset designated position. In this way, the accuracy and stability of the measurement data of the viscometer or rheometer depend on the gap or pressure value between the measuring rotor and the test base plate on the measuring host, and the setting of the displacement adjustment part enables the operator to confirm in advance the stop position of the second slider before the second slider slides downward, and the final gap or pressure value between the measuring rotor and the test base plate can be quickly adjusted by sliding the displacement adjustment part to ensure that the second slider can stop sliding at the corresponding position each time it slides down. The measurement principle is simple and easy to understand, with high measurement accuracy and good repeatability. In addition, the lifting device for precisely controlling the displacement accuracy of the present application has low structural requirements for the power component and can significantly reduce production costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 A schematic diagram of the structure of a lifting device for precisely controlling displacement accuracy according to an embodiment of the present invention;

[0022] Figure 2 for Figure 1 Detailed drawing of point A in the middle;

[0023] Figure 3 A schematic diagram of the base structure of an embodiment of the present invention;

[0024] Figure 4 This is a schematic diagram of the structure of a power assembly according to an embodiment of the present invention;

[0025] Figure 5This is a schematic diagram of the structure of a traction member according to an embodiment of the present invention;

[0026] Figure 6 A schematic diagram of the structure of a displacement adjusting member according to an embodiment of the present invention;

[0027] Figure 7 Schematic diagram of the structure of a viscometer according to an embodiment of the present invention.

[0028] In the figure: 1. base; 11. guide rail; 12. support foot; 13. top plate; 2. first slider; 21. limit switch; 3. second slider; 4. traction member; 41. limit part; 42. connecting part; 5. displacement adjustment member; 51. third slider; 52. limit fine-tuning nut; 53. locking threaded hole; 6. power assembly; 61. motor; 62. screw; 7. viscometer; 71. test host; 72. measuring rotor; 73. test base plate; 8. controller; 9. bracket. DETAILED DESCRIPTION

[0029] The specific implementation of the present invention is further described in detail below in conjunction with the accompanying drawings and examples. The following examples are used to illustrate the present invention, but are not intended to limit the scope of the present invention.

[0030] It should be understood that the present invention uses the terms "front", "back", etc. to describe various information, but these information should not be limited to these terms, and these terms are only used to distinguish the same type of information from each other. For example, "front" information may also be referred to as "back" information, and "back" information may also be referred to as "front" information without departing from the scope of the present invention.

[0031] like Figures 1 to 7 As shown, the present invention provides a lifting device for accurately controlling displacement accuracy, which includes a base 1 and a guide rail 11 and a power assembly 6 arranged on the base 1. Specifically, a plurality of guide rails 11 parallel to each other are provided on the base 1. The first slider 2, the second slider 3 and the displacement adjusting member 5 are sequentially sleeved on the guide rail 11 from top to bottom. The first slider 2 and the second slider 3 can slide along the guide rail 11. The first slider 2 and the second slider 3 are connected by a traction member 4. The traction member 4 includes a limiting portion 41 and a connecting portion 42 sequentially arranged from top to bottom. The limiting portion 41 is located above the first slider 2. The connecting portion 42 passes through a through hole on the first slider 2 and is fixedly connected to the second slider 3. The diameter of the through hole is larger than that of the connecting portion 42, and the diameter of the through hole is smaller than that of the limiting portion 41. The displacement adjusting member 5 is located below the second slider 3, which is sleeved on the guide rail 11 and can slide along the guide rail 11. The power assembly 6 is used to drive the first slider 2 to slide along the guide rail 11.

[0032] Based on the above structure, when in use, the test host 71 of the viscometer 7 is fixed on the second slider 3, and the test base plate 73 is fixed on the base 1. At this time, the measuring rotor 72 is also fixed on the second slider 3 together with the measuring host 71. During the ascending process, the first slider 2 slides upward along the guide rail 11 driven by the power component 6. As the first slider 2 slides, the first slider 2 contacts the limiting portion 41 of the traction member 4, and the first slider 2 continues to slide upward. The traction member 4 slides upward under the drive of the first slider 2, and the second slider 3 connected to the traction member 4 also slides upward, thereby realizing the upward displacement of the test host 71; further, during the descending process, the first slider 2 slides downward along the guide rail 11 driven by the power component 6. Under the action of gravity, the traction member 4 and the second slider 3 also slide downward with the sliding of the first slider 2. Based on the setting of the displacement adjusting member 5, the second slider 3 contacts the displacement adjusting member 5 during the downward sliding process. Due to the obstruction of the displacement adjusting member 5, the sliding stops. At this time, the first slider 2 continues to slide downward under the drive of the motor, causing the limiting portion 41 of the traction member 4 to disengage from the first slider 2 and move in the reverse direction. As the downward sliding of the first slider 2 increases, the reverse displacement of the limiting portion 41 of the traction member 4 increases, and the limiting portion 41 of the traction member 4 will trigger the limit switch 21 above it. After the triggering, the power assembly 6 stops running, the first slider 2 also stops sliding, and all components of the entire mechanism stop moving, so that the second slider 3 falls at the preset designated position. In this way, the accuracy and stability of the measurement data of the viscometer 7 or rheometer depend on the gap or pressure value between the measuring rotor 72 and the test base plate 73 on the measuring host, and the setting of the displacement adjustment member 5 enables the operator to adjust the stop position of the second slider 3 in advance before the second slider 3 slides downward. By accurately sliding the displacement adjustment member 5, the final gap between the measuring rotor 72 and the test base plate 73 can be quickly adjusted to ensure that the second slider 3 can stop sliding at the corresponding position each time it slides down. The measurement principle is simple and easy to understand, and the measurement repeatability is high. In addition, the lifting device for precisely controlling the displacement accuracy of the present application has low structural requirements for the power component 6, and the displacement control accuracy of the device gets rid of the requirements of high-precision motor drive and screw grinding accuracy, which can significantly reduce production costs.

[0033] Further, such as Figure 4 As shown, in the embodiment of the present invention, the power assembly 6 includes a motor 61 and a screw rod 62 connected to the output end of the motor 61, the motor 61 is arranged on the base 1, and the first slider 2 is sleeved on the screw rod 62. Based on this, the lifting device provided by the present invention controls the sliding of the first slider 2 through the motor 61 and the screw rod 62, and its structure is simple, easy to use, and can effectively reduce the production cost.

[0034] It should be noted that the power assembly 6 of the lifting device in the present application can also be in various other forms, such as a hydraulic cylinder or an electric push rod. On the basis of driving the first slider 2 to slide along the guide rail 11, the operator can reasonably select different power assemblies 6 according to actual usage conditions, which will not be repeated here.

[0035] Optional, such as Figure 1 and Figure 2 As shown, a controller 8 is provided on the side of the base 1, and the controller 8 is electrically connected to the motor 61. The forward and reverse operation of the motor 61 and the stopping of the lifting device are controlled by the controller 8. The controller 8 can be a PLC all-in-one machine, a single-chip microcomputer, or two trigger button switches. Specifically, in some embodiments of the present application, a limit switch 21 connected to the first slider 2 is also provided above the traction member 4. The limit switch 21 is electrically connected to the controller 8. During the descending process of the first slider 2 and the second slider 3, the second slider 3 contacts the displacement adjusting member 5 and stops sliding, and the first slider 2 continues to slide downward. As the first slider 2 slides, the limit portion 41 of the traction member 4 touches the limit switch 21 upward, and the limit switch 21 sends a signal to the controller 8 to control the motor 61 to stop running. In this way, the setting of the limit switch 21 can stop the operation of the motor 61 in time after the second slider 3 reaches the specified position, and stop the first slider 2 from sliding down. Through such a logical design, the displacement and displacement repeatability of the second slider 3 are determined by the displacement adjustment member 5, and are independent of the accuracy of the motor 61 and the screw rod 62, and the repeatability has no error, thereby improving the displacement accuracy of the lifting device and greatly reducing the manufacturing cost.

[0036] Optional, such as Figure 7 As shown, in some embodiments of the present application, a bracket 9 is further provided below the displacement adjusting member 5, and the bracket 9 is sleeved on the guide rail 11 and can slide along the guide rail 11. The length of the measuring rotor 72 of some viscometers 7 is limited. In order to ensure the contact between the measuring rotor 72 and the test base plate 73 during actual testing, the bracket 9 is provided below the displacement adjusting member 5. In actual use, the test base plate 73 can be provided on the bracket 9. By sliding the bracket 9 up and down, the distance between the test base plate 73 and the measuring rotor 72 can also be changed, so as to avoid affecting the measurement work due to the insufficient length of the measuring rotor 72.

[0037] Further, such as Figure 2 As shown, in some embodiments of the present application, a plurality of height-adjustable support feet 12 are provided at the bottom of the base 1. The operator can adjust the height and inclination of the entire lifting device by adjusting the height of the support feet 12, thereby improving the operator's experience. At the same time, when encountering an uneven test table top, the height of each support foot 12 can be adjusted separately to keep the test base plate 73 flat to meet the test requirements.

[0038] Furthermore, the first end of each guide rail 11 is connected to the base 1, and the second end of each guide rail 11 is connected to the top plate 13. Another limit switch is set below the top plate 13, which is equivalent to setting a sliding end point for the first slider 2 and the second slider 3 to prevent the first slider 2 and the second slider 3 from sliding out of the screw rod 62 and affecting subsequent measurement work.

[0039] In addition, the connecting portion 42 of the traction member 4 is connected to the second slider 3 via a thread. When in use, the distance between the second slider 3 and the traction member 4 can be slowly adjusted by rotating the connecting portion 42. The connection method is simple and reliable, with high adjustment accuracy, and is very convenient to use.

[0040] In addition, if Figure 6 As shown, the displacement adjustment member 5 includes a third slider 51 which is sleeved on the guide rail 11 and can slide along the guide rail 11, and a limit fine-tuning nut 52 which is sleeved on the third slider 51, and the limit fine-tuning nut 52 is threadedly connected to the third slider 51. In actual use, long-distance adjustment is first completed by sliding the third slider 51, and then fine adjustment is achieved by slowly rotating the limit fine-tuning nut 52. The design is reasonable, the adjustment accuracy is high, and it is easy to use. It should be noted that a locking threaded hole 53 is also provided on the third slider 51. When the displacement adjustment member 5 is adjusted to a specified position, a locking bolt is set in the locking threaded hole 53 to fix the third slider 51, so as to prevent the displacement adjustment member 5 from sliding during use and affecting the adjustment accuracy.

[0041] In summary, the present invention provides a lifting device for precisely controlling displacement accuracy, which includes a base, a guide rail and a power assembly arranged on the base, a plurality of guide rails parallel to each other are arranged on the base, a first slider, a second slider and a displacement adjusting member are sequentially sleeved on the guide rails from top to bottom, the first slider and the second slider can slide along the guide rails, the first slider and the second slider are connected by a traction member, the traction member includes a limiting portion and a connecting portion sequentially arranged from top to bottom, the limiting portion is located above the first slider, the connecting portion passes through a through hole on the first slider and is fixedly connected to the second slider, the diameter of the through hole is larger than the connecting portion, and the diameter of the through hole is smaller than the limiting portion, the displacement adjusting member is located below the second slider, it is sleeved on the guide rail and can slide along the guide rail, and the power assembly is used to drive the first slider to slide along the guide rail. Compared with the prior art, the lifting device for precisely controlling displacement accuracy has low requirements on the main control accuracy components, such as a drive motor, a screw rod, a position sensor, etc., so the production cost is low, the adjustment method is simple and reliable, easy to adjust, and the repeatability error is zero.

[0042] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and substitutions can be made without departing from the technical principles of the present invention. These improvements and substitutions should also be regarded as the scope of protection of the present invention.

Claims

1. A lifting device for precisely controlling displacement accuracy, characterized in that: include: A base, wherein the base is provided with a plurality of guide rails parallel to each other, and a controller is provided on the side of the base; a first slider, the first slider being sleeved on the guide rail and being able to slide along the guide rail, the first slider being provided with a through hole penetrating therethrough; a second slider, the second slider being sleeved on the guide rail and being able to slide along the guide rail, and the second slider being located below the first slider; A traction member, the traction member includes a limiting portion and a connecting portion arranged in sequence from top to bottom, the limiting portion is located above the first slider, the connecting portion passes through the through hole and is fixedly connected to the second slider, the diameter of the through hole is larger than the connecting portion, and the diameter of the through hole is smaller than the limiting portion, a limit switch connected to the first slider is arranged above the traction member, and the limit switch is electrically connected to the controller; A displacement adjustment member, the displacement adjustment member is sleeved on the guide rail and can slide along the guide rail, the displacement adjustment member is located below the second slider, the displacement adjustment member includes a third slider and a limit fine-adjustment nut, the third slider is sleeved on the guide rail and can slide along the guide rail, the limit fine-adjustment nut is sleeved on the third slider and is threadedly connected to the third slider; A power assembly is used to drive the first slider to slide along the guide rail. The power assembly includes a motor and a screw connected to the output end of the motor. The motor is arranged on the base and electrically connected to the controller. The first slider is sleeved on the screw.

2. The lifting device for precisely controlling displacement accuracy according to claim 1, characterized in that: It also includes a bracket sleeved on the guide rail, the bracket is located below the displacement adjusting member and can slide along the guide rail.

3. The lifting device for precisely controlling displacement accuracy according to claim 1, characterized in that: The connecting portion of the traction member is threadedly connected to the second sliding block.

4. The lifting device for precisely controlling displacement accuracy according to claim 1, characterized in that: The bottom of the base is provided with a plurality of support feet with adjustable height and inclination.

5. The lifting device for precisely controlling displacement accuracy according to claim 1, characterized in that: The first end of each guide rail is connected to the base, and the second end of each guide rail is connected to the top plate.

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