Automatic return positioning device for horizontal slide table of electric vibration table and use method thereof

Abstract

The invention discloses an automatic return positioning device for a horizontal slide of an electric vibration table and a use method thereof. The device comprises a horizontal slide work surface support body, an electric vibration table is installed in the horizontal slide work surface support body, the electric vibration table is connected to the horizontal slide work surface, a plurality of limit blocks are arranged on the horizontal slide work surface, an automatic return positioning device for a horizontal slide corresponding to the limit blocks is arranged on the horizontal slide work surface support body, and the automatic return positioning device for the horizontal slide comprises a shell, a slide groove corresponding to the limit block is arranged on the shell, a rotatable ball screw corresponding to the slide groove, a measuring slip ring corresponding to the ball screw, and a signal detection unit corresponding to the measuring slip ring are installed in the shell, thereby ensuring stable and accurate vibration of the horizontal slide and the vibration equipment, eliminating test errors, and not generating damping to the horizontal slide during its movement.

Description

Technical Field

[0001] The invention relates to the technical field of electric vibration tables, and in particular to an automatic return positioning device for a horizontal slide table of an electric vibration table and a use method thereof. Background Art

[0002] The horizontal slide is a horizontal auxiliary table required for the electric vibration table to conduct experiments. When the test sample, especially the whole machine test sample, needs to be subjected to a horizontal vibration test and it cannot be installed and fixed by the position of the rotating vibration table, a horizontal slide is required. The horizontal slide is generally composed of a worktable support and a worktable that slides horizontally with the worktable support. One end of the worktable is connected to the vibration component of the vibration table through a connector or a coupling. The function of the horizontal slide is to transmit the movement of the vibration generator to the test sample in the horizontal direction, or to support large test pieces in horizontal vibration tests.

[0003] There are many structural forms of existing horizontal slides, which can be roughly divided into three types: hydraulic, mechanical, and air spring. Any horizontal slide consists of two parts: the work surface support and the work surface, and the friction resistance between these two parts is an important indicator for measuring the quality of the horizontal slide. When using a horizontal slide for vibration testing, the work surface is required to reciprocate with the static position as the origin. However, in actual situations, the balance point of the reciprocating motion of the work surface is often offset due to the friction resistance of the support components and the inertia of the work surface itself, resulting in a reduction in the effective displacement of the vibration. In severe cases, the moving coil and the magnetic pole wedge will collide, causing damage to the equipment and test products.

[0004] Chinese patent CN101093182B discloses a method and device for restoring and positioning a horizontal slide, wherein an elastic restoring mechanism is provided between the working surface and the supporting body of the working surface of the horizontal slide to offset the inertia of the moving direction of the working surface when the working surface moves horizontally, and the elastic restoring mechanism is a rigid shaft connector or a U-shaped spring with elastic bodies provided at both ends, and the two ends of the elastic restoring mechanism are respectively fixed on the working surface and the supporting body of the surface. This method can solve the problem of the offset of the balance point of the horizontal slide, but due to the addition of the rigid shaft connector or the U-shaped spring, due to its material characteristics, it will produce damping on the reciprocating motion of the horizontal slide. Summary of the invention

[0005] In view of the above-mentioned technical deficiencies, the purpose of the present invention is to provide an automatic return positioning device for a horizontal slide of an electric vibration table and a method of using the same, which can not only effectively solve the problem of the worktable offset from the origin caused by friction resistance and its own movement inertia, ensure the stable and precise vibration of the horizontal slide and the vibration equipment, and eliminate test errors, but also will not produce any damping on the horizontal slide. During the reciprocating motion of the horizontal slide, it does not contact the worktable surface, and will automatically return to the worktable surface after the motion ends. It can also measure the displacement size and direction of the horizontal slide offset from the origin, so as to facilitate understanding of the movement of the horizontal slide.

[0006] In order to solve the above technical problems, the present invention adopts the following technical solutions:

[0007] The present invention provides an automatic return positioning device for a horizontal slide of an electric vibration table, comprising a horizontal slide work surface support body, an electric vibration table is installed in the horizontal slide work surface support body, the electric vibration table is connected to the horizontal slide work surface, a plurality of limit blocks are arranged on the horizontal slide work surface, the horizontal slide work surface support body is provided with an automatic return positioning device for a horizontal slide corresponding to the limit blocks, the automatic return positioning device for a horizontal slide comprises a shell, a slide groove corresponding to the limit block is arranged on the shell, a rotatable ball screw corresponding to the slide groove, a measuring slip ring corresponding to the ball screw and a signal detection unit corresponding to the measuring slip ring are installed in the shell, and a signal detection unit that can rotate in the opposite direction as the ball screw rotates is installed on the ball screw A moving left-side lead screw nut and a right-side lead screw nut, a retractable air duct sleeved on the ball screw is arranged between the left-side lead screw nut and the right-side lead screw nut, the retractable air duct is connected with the air supply device through a two-position three-way reversing valve, the ball screw is sleeved with a reset spring corresponding to the left-side lead screw nut and the right-side lead screw nut, the left-side lead screw nut and the right-side lead screw nut are provided with a support plate that can slide along the slide groove and a measuring probe corresponding to the measuring slip ring, a positioning plate corresponding to the limit block is installed on the support plate, and copper electrode sheets are correspondingly arranged on the positioning plate and the limit block, the copper electrode sheet, the measuring slip ring and the signal detection unit are electrically connected, and the signal detection unit, the electric vibration table, the two-position three-way reversing valve, the air supply device and the processing unit are electrically connected.

[0008] Preferably, the housing is provided with through holes corresponding to the two ends of the ball screw, and bearings for connecting with the ends of the ball screw are installed in the through holes.

[0009] Preferably, the ball screw is sequentially sleeved with an oil retaining ring corresponding to the bearing and a gasket corresponding to the oil retaining ring.

[0010] Preferably, the inner diameter of the through hole is smaller than the median diameter of the return spring.

[0011] Preferably, the shaft section of the ball screw located in the telescopic air duct is arranged in a flat structure, which can drive the ball screw to rotate along with the airflow introduced into the telescopic air duct.

[0012] Preferably, a threaded rod threadably connected to the support plate is formed on the positioning plate.

[0013] Preferably, the positioning plate includes a left positioning plate installed on the left side screw nut and a right positioning plate installed on the right side screw nut, the copper electrode plate includes a left copper electrode plate installed on the left positioning plate and a right copper electrode plate installed on the right positioning plate, the limit block includes a left limit plate corresponding to the left positioning plate and a right limit plate corresponding to the right positioning plate, the left limit plate is installed with a copper electrode plate corresponding to the left copper electrode plate, and the right limit plate is installed with a copper electrode plate corresponding to the right copper electrode plate.

[0014] Preferably, the signal detection unit includes an offset direction detection module and an offset displacement detection module, the offset direction detection module includes a first high and low level generating circuit, a second high and low level generating circuit, a first azimuth indicator light, a second azimuth indicator light, a first NAND gate, a second NAND gate, a third NAND gate, and a fourth NAND gate, which are connected to each other; one end of the left copper electrode sheet of the first high and low level generating circuit is grounded, and the other end of the left copper electrode sheet is connected to a resistor and an input end of the first NAND gate; one end of the left copper electrode sheet of the second high and low level generating circuit is grounded, and the other end of the left copper electrode sheet is connected to a resistor and an input end of the third NAND gate; the offset displacement detection module includes a measuring probe and a measuring slip ring, the surface of the measuring slip ring is evenly printed with interconnected conductive copper wires at fixed intervals, and the measuring probe is in contact with the surface of the conductive copper wires on the measuring slip ring.

[0015] Preferably, the fixed interval of the conductive copper wires on the surface of the measuring slip ring ranges from 0.1 mm to 1 mm.

[0016] The present invention also provides a method for using the above device, which specifically comprises the following steps:

[0017] (1) The operation of the electric vibration table drives the horizontal slide table work surface to conduct experiments. The processing unit controls the two-position three-way reversing valve to switch to the left position, and the air supply device ventilates the retractable air duct, driving the ball screw to rotate, thereby driving the left screw nut and the right screw nut to move, thereby driving the support plate to move, and the movement of the support plate drives the positioning plate to move, so that the copper electrode sheet on the dynamic positioning plate contacts the copper electrode sheet on the limit block, and this position is used as the initial zero position of the automatic return positioning device of the horizontal slide, and the reset spring is in a compressed state at this time;

[0018] (2) After determining the initial zero position, the processing unit controls the two-position three-way reversing valve to switch to the right position, at which time the ball screw is driven to rotate in the opposite direction to step (1), the return spring rebounds, and the left and right lead screw nuts move to the state before step (1) starts;

[0019] (3) When the processing unit detects that the electric vibration table stops running, the control reversing valve is switched to the left position. If the left copper electrode sheet contacts the copper electrode sheet on the limit block first, the first high-low level generating circuit generates a low level, so that the first azimuth indicator light is on, and the offset direction of the horizontal slide table working surface is rightward relative to the initial zero position; if the right copper electrode sheet contacts the copper electrode sheet on the limit block first, the second high-low level generating circuit generates a low level, so that the second azimuth indicator light is on, and the offset direction of the horizontal slide table working surface is leftward relative to the initial zero position;

[0020] (4) When the processing unit detects that the first high-low level generating circuit or the second high-low level generating circuit generates a low level, it starts to detect the on-off status of the measuring slip ring and the measuring probe, and obtains the number of times N that the measuring slip ring and the measuring probe change from being disconnected to being connected. Then, the offset displacement ΔL of the horizontal slide table working surface is calculated using the following formula:

[0021] ΔL=N×Δd;

[0022] Where Δd is the distance between adjacent conductive copper wires on the measuring slip ring;

[0023] (5) When the processing unit detects that the on-off status of the measuring slip ring and the measuring probe has not changed within 3 seconds, the two-position three-way reversing valve is controlled to switch to the right position and step (2) is repeated.

[0024] The beneficial effects of the present invention are:

[0025] The automatic return positioning device for the horizontal slide of the electric vibration table provided by the present invention only needs to detect the on-off digital signal during operation, and the signal detection and processing is convenient and easy; corresponding devices can be designed for horizontal slides with different vibration ranges, and the applicability is strong; the traditional horizontal slide return positioning device adopts a rigid shaft connector or a U-shaped spring to connect and fix on the work table and the table support body, and uses its own return elastic force to return the offset displacement of the horizontal slide, but in the working process of the horizontal slide, since the rigid shaft connector or the U-shaped spring is connected and fixed on the work table and the table support body, it will inevitably produce a certain damping on the movement of the horizontal slide, and compared with the traditional horizontal slide return positioning device, the device of the present invention is in the working process of the horizontal slide It does not contact with it. After the working process of the horizontal slide is completed, the automatic recovery positioning device starts to work and recovers the offset displacement of the horizontal slide, which effectively avoids the damping of the horizontal slide during its working process. At the same time, it ensures that the amplitude of the workbench always takes the reference origin as the balance point, and effectively prevents the offset of the balance point of the workbench. The device of the present invention can measure the offset direction and size of the horizontal slide, which is convenient for analyzing the movement of the horizontal slide. The device of the present invention effectively solves the problem of the offset origin of the workbench caused by the friction resistance of the workbench surface and the inertia of its own movement through the automatic recovery of the offset displacement of the horizontal slide, ensures the stable and accurate vibration of the horizontal slide and the vibration equipment, eliminates the test error, and also effectively protects the moving coil of the vibration equipment. The whole set of devices has a simple and reliable structure, low cost, small space size, strong adaptability, good use effect, and wide practicality. How to solve the relationship between the offset of the workbench caused by friction resistance and the inertia of its own movement, where is the specific embodiment of no contact and no damping body, it is best to describe it in detail according to the specific structure; BRIEF DESCRIPTION OF THE DRAWINGS

[0026] 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 or the description of the prior art 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.

[0027] Figure 1 It is a schematic diagram of the horizontal slide table device of the electric vibration table;

[0028] Figure 2 is a three-dimensional schematic diagram of the shell;

[0029] Figure 3 It is a structural schematic diagram of the automatic return positioning device of the horizontal slide table;

[0030] Figure 4 This is a schematic diagram of the offset direction detection module;

[0031] Figure 5 It is a schematic diagram of the on-off status of the measuring slip ring and the measuring probe;

[0032] In the figure: 1. electric vibration table, 2. horizontal slide working table, 201. limit block, 3. automatic return positioning device of horizontal slide, 4. horizontal slide working table support body, 31. shell, 32. right side lead screw nut, 33. bolt, 34. left copper electrode sheet, 35. positioning plate, 36. telescopic air duct, 37. support plate, 38. right copper electrode sheet, 39. left side lead screw nut, 310. ball screw, 311. return spring, 312. screw, 313. bearing end cover, 314. bearing, 315. oil retaining ring, 316. gasket, 317. measuring slip ring, 318. two-position three-way reversing valve, 319. measuring probe, 320. signal detection unit, 321. processing unit. DETAILED DESCRIPTION

[0033] 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.

[0034] like Figures 1 to 5As shown, the present embodiment provides an automatic return positioning device for a horizontal slide of an electric vibration table, comprising a horizontal slide work surface support body 4, an electric vibration table 1 is installed in the horizontal slide work surface support body 4, the electric vibration table 1 is connected to a horizontal slide work surface 2, a plurality of limit blocks 201 are arranged on the horizontal slide work surface 2, the horizontal slide work surface support body 4 is provided with a horizontal slide automatic return positioning device 3 corresponding to the limit blocks 201, the horizontal slide automatic return positioning device 3 comprises a shell 31, a slide groove corresponding to the limit block 201 is arranged on the shell 31, a rotatable ball screw 310 corresponding to the slide groove, a measuring slip ring 317 corresponding to the ball screw 310 and a signal detection unit 320 corresponding to the measuring slip ring 317 are installed in the shell 31, and a left screw nut capable of moving in the opposite direction as the ball screw 310 rotates is installed on the ball screw 310 39, right side lead screw nut 32, a retractable air duct 36 sleeved on the ball screw 310 is arranged between the left side lead screw nut 39 and the right side lead screw nut 32, the retractable air duct 36 is connected to the air supply device through a two-position three-way reversing valve 318, the ball screw 310 is sleeved with a return spring 311 corresponding to the left side lead screw nut 39 and the right side lead screw nut 32, the left side lead screw nut 39 and the right side lead screw nut 32 are installed with a support plate 37 that can slide along the slide groove and a measuring probe 319 corresponding to the measuring slip ring 317, the support plate 37 is installed with a positioning plate 35 corresponding to the limit block 201, the positioning plate 35 and the limit block 201 are correspondingly provided with copper electrode sheets, the copper electrode sheet, the measuring slip ring 317 and the signal detection unit 320 are electrically connected, and the signal detection unit 320, the electric vibration table 1, the two-position three-way reversing valve 318, the air supply device and the processing unit 321 are electrically connected.

[0035] Preferably, the measuring slip ring 317 of this embodiment uses polyimide or polyester film as a base material.

[0036] Preferably, the housing 31 of this embodiment is configured in a rectangular parallelepiped structure.

[0037] The housing 31 is provided with through holes corresponding to the two ends of the ball screw 310, and the through holes are provided with bearings 314 for connecting with the ends of the ball screw 310. The ball screw 310 is sequentially sleeved with oil deflector rings 315 corresponding to the bearings 314 and gaskets 316 corresponding to the oil deflector rings 315. The inner diameter of the through hole is smaller than the median diameter of the return spring 311.

[0038] The telescopic air duct 36 is connected to the left lead screw nut 39 and the right lead screw nut 32 via the left and right flanges. The shaft section of the ball screw 310 located in the telescopic air duct 36 is arranged in a flat structure, and can drive the ball screw 310 to rotate with the airflow entering the telescopic air duct 36. The positioning plate 35 is formed with a threaded rod threadedly connected to the support plate 37.

[0039] The positioning plate 35 includes a left positioning plate installed on the left side screw nut 39 and a right positioning plate installed on the right side screw nut 32. The copper electrode plate includes a left copper electrode plate 38 installed on the left positioning plate and a right copper electrode plate 34 installed on the right positioning plate. The limit block 201 includes a left limit plate corresponding to the left positioning plate and a right limit plate corresponding to the right positioning plate. A copper electrode plate corresponding to the left copper electrode plate 38 is installed on the left limit plate, and a copper electrode plate corresponding to the right copper electrode plate 34 is installed on the right limit plate.

[0040] The signal detection unit includes an offset direction detection module and an offset displacement detection module, and the offset direction detection module includes a first high and low level generating circuit, a second high and low level generating circuit, a first azimuth indicator light, a second azimuth indicator light, a first NAND gate, a second NAND gate, a third NAND gate, and a fourth NAND gate that are interconnected; one end of the left copper electrode sheet 38 of the first high and low level generating circuit is grounded, and the other end of the left copper electrode sheet 38 is connected to a resistor and an input end of the first NAND gate; one end of the left copper electrode sheet 34 of the second high and low level generating circuit is grounded, and the other end of the left copper electrode sheet 34 is connected to a resistor and an input end of the third NAND gate; the output end of the second NAND gate in the circuit is connected to the first azimuth indicator light, the second NAND gate input end and The first NAND gate output terminal and the fourth NAND gate output terminal are connected, the fourth NAND gate output terminal in the circuit is connected to the second azimuth indicator light, the fourth NAND gate input terminal and the second NAND gate output terminal, and the third NAND gate output terminal are connected, one end of the first NAND gate input terminal is connected to the left copper electrode sheet 38 of the first high and low level generating circuit, and the other end is connected to the positive pole of the power supply, one end of the third NAND gate input terminal is connected to the left copper electrode sheet 34 of the second high and low level generating circuit, and the other end is connected to the positive pole of the power supply; the offset displacement detection module includes a measuring probe 319 and a measuring slip ring 317, the surface of the measuring slip ring 317 is evenly printed with interconnected conductive copper wires at fixed intervals, and the measuring probe 319 is in contact with the surface of the conductive copper wire on the measuring slip ring 317.

[0041] The fixed interval of the conductive copper wires on the surface of the measuring slip ring 317 ranges from 0.1 mm to 1 mm.

[0042] The electric vibration table 1, horizontal slide work surface 2, limit block 201, horizontal slide automatic return positioning device 3, horizontal slide work surface support body 4, shell 31, right side lead screw nut 32, bolt 33, left copper electrode sheet 34, positioning plate 35, retractable air duct 36, support plate 37, right copper electrode sheet 38, left side lead screw nut 39, ball screw 310, return spring 311, screw 312, bearing end cover 313, bearing 314, oil retainer 315, gasket 316, measuring slip ring 317, two-position three-way reversing valve 318, air supply equipment, measuring probe 319, signal detection unit 320, processing unit 321 of this embodiment adopt existing products or structures well known to those skilled in the art and are not described in detail here.

[0043] The limit block 201 of this embodiment is fixed to the horizontal slide table work surface 2 using the existing technology well known to those skilled in the art, and will not be described in detail here.

[0044] The housing 31 is processed with a wiring hole for the signal detection unit 320 which is well known to those skilled in the art, and the signal detection unit 320 is placed in the reserved space of the housing 31 .

[0045] The signal detection unit 320, the electric vibration table 1, the two-position three-way reversing valve 318, the air supply device and the processing unit 321 are controlled by the existing control method well known to those skilled in the art, and will not be described in detail here.

[0046] The method of using the above device specifically comprises the following steps:

[0047] (1) The electric vibration table 1 drives the horizontal slide table work surface 2 to perform experiments. The processing unit 321 controls the two-position three-way reversing valve 318 to switch to the left position, and the air supply device ventilates the retractable air duct 36, driving the ball screw 310 to rotate, thereby driving the left screw nut 39 and the right screw nut 32 to move, thereby driving the support plate 37 to move, and the movement of the support plate 37 drives the positioning plate 35 to move, so that the copper electrode sheet on the moving positioning plate 35 contacts the copper electrode sheet on the limit block 201, and the position is taken as the initial zero position of the automatic return of the horizontal slide to the positioning device 3. At this time, the reset spring 311 is in a compressed state;

[0048] (2) After determining the initial zero position, the processing unit 321 controls the two-position three-way reversing valve 318 to switch to the right position, at which time the ball screw 310 is driven to rotate in a direction opposite to that in step 1, and the return spring 311 rebounds, and the left screw nut 39 and the right screw nut 32 move to the state before the start of step 1;

[0049] (3) When the processing unit 321 detects that the electric vibration table 1 stops running, the control reversing valve 318 is switched to the left position. If the left copper electrode sheet 38 first contacts the copper electrode sheet on the limit block 201, the first high-low level generating circuit generates a low level, so that the first azimuth indicator light is on, and the offset direction of the horizontal slide table work surface 2 is rightward relative to the initial zero position; if the right copper electrode sheet 34 first contacts the copper electrode sheet on the limit block 201, the second high-low level generating circuit generates a low level, so that the second azimuth indicator light is on, and the offset direction of the horizontal slide table work surface 2 is leftward relative to the initial zero position;

[0050] (4) When the processing unit 321 detects that the first high-low level generating circuit or the second high-low level generating circuit generates a low level, it starts to detect the on-off status of the measuring slip ring 317 and the measuring probe 319, and obtains the number of times N that the measuring slip ring 317 and the measuring probe 319 change from being disconnected to being connected. Then, the offset displacement ΔL of the horizontal slide table working surface 2 is calculated using the following formula:

[0051] ΔL=N×Δd;

[0052] Where Δd is the distance between adjacent conductive copper wires on the measuring slip ring 317;

[0053] (5) When the processing unit 321 detects that the on-off status of the measuring slip ring 317 and the measuring probe 319 has not changed within 3 seconds, the two-position three-way reversing valve 318 is controlled to switch to the right position, and step 2 is repeated.

[0054] The automatic return positioning device of the horizontal slide of the electric vibration table of the present embodiment only needs to detect the on-off digital signal during operation, and the signal detection and processing is convenient and easy. For horizontal slides with different vibration ranges, corresponding devices can be designed accordingly, which has strong applicability. The traditional horizontal slide return positioning device adopts a rigid shaft connector or a U-shaped spring to connect and fix on the work table and the table support body, and uses its own return elastic force to restore the offset displacement of the horizontal slide. However, during the operation of the horizontal slide, since the rigid shaft connector or the U-shaped spring is connected and fixed on the work table and the table support body, it will inevitably produce a certain damping on the movement of the horizontal slide. Compared with the traditional horizontal slide return positioning device, the device of the present invention does not during the operation of the horizontal slide. The device automatically returns to the horizontal slide after the working process of the horizontal slide, and starts to work to return the offset displacement of the horizontal slide, effectively avoiding damping during the working process of the horizontal slide, and at the same time ensuring that the amplitude of the workbench always takes the reference origin as the balance point, effectively preventing the offset of the balance point of the workbench; the device of this embodiment can measure the offset direction and size of the horizontal slide, which is convenient for analyzing the movement of the horizontal slide; the device of this embodiment effectively solves the problem of the offset origin of the workbench caused by the friction resistance of the workbench surface and its own movement inertia by automatically returning to the offset displacement of the horizontal slide, ensuring the stable and accurate vibration of the horizontal slide and the vibration equipment, eliminating test errors, and also effectively protecting the moving coil of the vibration equipment. The whole set of devices has a simple and reliable structure, low cost, small space size, strong adaptability, good use effect, and has wide practicality.

[0055] Obviously, those skilled in the art can make various changes and modifications to the present invention without departing from the spirit and scope of the present invention. Thus, if these modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include these modifications and variations.

Claims

1. The automatic return positioning device of the horizontal slide table of the electric vibration table is characterized by: The invention comprises a horizontal slide work surface support body (4), an electric vibration table (1) is installed in the horizontal slide work surface support body (4), the electric vibration table (1) is connected to the horizontal slide work surface (2), a plurality of limit blocks (201) are arranged on the horizontal slide work surface (2), and a horizontal slide automatic return positioning device (3) corresponding to the limit blocks (201) is arranged on the horizontal slide work surface support body (4), and the horizontal slide automatic return positioning device (3) comprises a shell (31), The housing (31) is provided with a slide groove corresponding to the limit block (201); a rotatable ball screw (310) corresponding to the slide groove, a measuring slip ring (317) corresponding to the ball screw (310), and a signal detection unit (320) corresponding to the measuring slip ring (317) are installed in the housing (31); a left-side screw nut (39) and a right-side screw nut (32) capable of moving in opposite directions as the ball screw (310) rotates are installed on the ball screw (310); A retractable air duct (36) sleeved on the ball screw (310) is arranged between the lead screw nut (39) and the right lead screw nut (32); the retractable air duct (36) is connected to the air supply device through a two-position three-way reversing valve (318); a return spring (311) corresponding to the left lead screw nut (39) and the right lead screw nut (32) is sleeved on the ball screw (310); a support plate (37) capable of sliding along a slide groove is installed on the left lead screw nut (39) and the right lead screw nut (32); ) and a measuring probe (319) corresponding to the measuring slip ring (317), a positioning plate (35) corresponding to the limit block (201) is installed on the support plate (37), copper electrode sheets are correspondingly arranged on the positioning plate (35) and the limit block (201), the copper electrode sheets and the measuring slip ring (317) are electrically connected to the signal detection unit (320), and the signal detection unit (320), the electric vibration table (1), the two-position three-way reversing valve (318), and the air supply device are electrically connected to the processing unit (321).

2. The automatic return positioning device for the horizontal slide table of the electric vibration table according to claim 1 is characterized in that: The housing (31) is provided with through holes corresponding to the two ends of the ball screw (310), and a bearing (314) for connecting to the end of the ball screw (310) is installed in the through hole.

3. The automatic return positioning device for the horizontal slide table of the electric vibration table as claimed in claim 2, characterized in that: The ball screw (310) is sequentially sleeved with an oil deflector ring (315) corresponding to the bearing (314) and a gasket (316) corresponding to the oil deflector ring (315).

4. The automatic return positioning device for the horizontal slide table of the electric vibration table as claimed in claim 2, characterized in that: The inner diameter of the through hole is smaller than the median diameter of the return spring (311).

5. The automatic return positioning device for the horizontal slide table of the electric vibration table as claimed in claim 1, characterized in that: The shaft section of the ball screw (310) located inside the telescopic air duct (36) is arranged in a flat structure, and can drive the ball screw (310) to rotate along with the airflow introduced into the telescopic air duct (36).

6. The automatic return positioning device for the horizontal slide table of the electric vibration table as claimed in claim 1, characterized in that: The positioning plate (35) is provided with a threaded rod which is threadedly connected to the support plate (37).

7. The automatic return positioning device for the horizontal slide table of the electric vibration table as claimed in claim 6, characterized in that: The positioning plate (35) includes a left positioning plate installed on the left side lead screw nut (39) and a right positioning plate installed on the right side lead screw nut (32); the copper electrode sheet includes a left copper electrode sheet (38) installed on the left positioning plate and a right copper electrode sheet (34) installed on the right positioning plate; the limit block (201) includes a left limit plate corresponding to the left positioning plate and a right limit plate corresponding to the right positioning plate; the left limit plate is provided with a copper electrode sheet corresponding to the left copper electrode sheet (38); and the right limit plate is provided with a copper electrode sheet corresponding to the right copper electrode sheet (34).

8. The automatic return positioning device for the horizontal slide table of the electric vibration table as claimed in claim 1, characterized in that: The signal detection unit comprises an offset direction detection module and an offset displacement detection module. The offset direction detection module comprises a first high and low level generating circuit, a second high and low level generating circuit, a first azimuth indicator light, a second azimuth indicator light, a first NAND gate, a second NAND gate, a third NAND gate, and a fourth NAND gate which are connected to each other. One end of the left copper electrode sheet (38) of the first high and low level generating circuit is grounded, and the other end of the left copper electrode sheet (38) is connected to a resistor and an input end of the first NAND gate. One end of the left copper electrode sheet (34) of the second high and low level generating circuit is grounded, and the other end of the left copper electrode sheet (34) is connected to a resistor and an input end of the third NAND gate. The offset displacement detection module comprises a measuring probe (319) and a measuring slip ring (317). The surface of the measuring slip ring (317) is evenly printed with interconnected conductive copper wires at fixed intervals, and the measuring probe (319) contacts the surface of the conductive copper wires on the measuring slip ring (317).

9. The automatic return positioning device for the horizontal slide table of the electric vibration table as claimed in claim 8, characterized in that: The fixed interval of the conductive copper wires on the surface of the measuring slip ring (317) ranges from 0.1 mm to 1 mm.

10. The method for using the automatic return positioning device for the horizontal slide table of an electric vibration table according to any one of claims 1 to 9, characterized in that: The following steps are involved: (1) The electric vibration table (1) is running to drive the horizontal slide table work surface (2) to conduct experiments. The processing unit (321) controls the two-position three-way reversing valve (318) to switch to the left position, and the air supply device ventilates the retractable air duct (36), driving the ball screw (310) to rotate, thereby driving the left screw nut (39) and the right screw nut (32) to move, thereby driving the support plate (37) to move, and the movement of the support plate (37) drives the positioning plate (35) to move, so that the copper electrode sheet on the moving positioning plate (35) contacts the copper electrode sheet on the limit block (201), and this position is used as the initial zero position of the automatic return positioning device (3) of the horizontal slide, and at this time the reset spring (311) is in a compressed state; (2) After determining the initial zero position, the processing unit (321) controls the two-position three-way reversing valve (318) to switch to the right position, at which time the ball screw (310) is driven to rotate in a direction opposite to that in step (1), and the return spring (311) rebounds, so that the left screw nut (39) and the right screw nut (32) move to the state before the start of step (1); (3) When the processing unit (321) detects that the electric vibration table (1) stops running, the control reversing valve (318) is switched to the left position. If the left copper electrode sheet (38) first contacts the copper electrode sheet on the limit block (201), the first high-low level generating circuit generates a low level, so that the first azimuth indicator light is on, and the horizontal slide table work surface (2) is offset to the right relative to the initial zero position; if the right copper electrode sheet (34) first contacts the copper electrode sheet on the limit block (201), the second high-low level generating circuit generates a low level, so that the second azimuth indicator light is on, and the horizontal slide table work surface (2) is offset to the left relative to the initial zero position; (4) When the processing unit (321) detects that the first high-low level generating circuit or the second high-low level generating circuit generates a low level, it starts to detect the on-off status of the measuring slip ring (317) and the measuring probe (319), and obtains the number of times N that the measuring slip ring (317) and the measuring probe (319) change from being disconnected to being connected. Then, the offset displacement ΔL of the horizontal slide table working surface (2) is calculated using the following formula: ΔL=N×Δd; Wherein Δd is the distance between adjacent conductive copper wires on the measuring slip ring (317); (5) When the processing unit (321) detects that the on-off status of the measuring slip ring (317) and the measuring probe (319) does not change within 3 seconds, the two-position three-way reversing valve (318) is controlled to switch to the right position, and step (2) is repeated.

Images