Self-compensating moving coil guiding device for large-scale shaker, and operating method thereof

Abstract

Disclosed in the present invention are a self-compensating moving coil guiding device for a large-scale shaker, and an operating method thereof. The device comprises a shaker body fixed to one side of a moving coil, wherein a piston cylinder is fixedly connected to an upper portion of the shaker body, a force transmission assembly is slidably provided in a cavity on the side in the piston cylinder that is close to the moving coil, one end of the force transmission assembly abuts against a piston head plate in the piston cylinder, the other end of the force transmission assembly extends from the piston cylinder and is in transmission connection with the moving coil by means of a toothed guide wheel mechanism, the cavity in the piston cylinder that is located on the other side of the piston head plate is a pressurizing cavity, and an oil / gas inlet is provided in a cavity wall of the pressurizing cavity; and an oil / gas compensation line connected to the oil / gas inlet in the pressurizing cavity. The present invention can solve the problems whereby under the working condition of a relatively large axial load, conventional guiding devices are prone to wear and loosening, need to rely on manual adjustments, and cannot compensate for the wear amount in real time; and the present invention can also perform wear monitoring on the toothed guide wheel mechanism, feed back in a timely manner the wear amount exceeding standard, and supply pressure to the pressurizing cavity by means of a miniature energy accumulator.

Description

A self-compensating large vibration table dynamic guide device and its working method Technical Field

[0001] The present invention relates to the field of electric vibration tables, and in particular to a self-compensating large-scale vibration table moving coil guide device and a working method thereof. Background Art

[0002] Electrodynamic vibration tables are primarily used for reliability testing of complete products and components in sectors such as aviation, aerospace, weapons, electronics, shipbuilding, machinery, energy, chemicals, and instrumentation. They can also be used to study the characteristics of structural dynamics. The operating principle is that a constant magnetic field is generated by passing direct current through the excitation coil. The driving coil, fed with alternating current, cuts through the magnetic lines of force within the constant magnetic field, generating electromagnetic force. Changing the direction of the current generates a corresponding alternating motion, i.e., electromagnetic force. The structure primarily consists of a moving coil (moving coil and driving coil), a magnetic circuit system, an elastic support system, a guide device, and a cooling device.

[0003] The guide device is a motion constraint mechanism that accurately positions the dynamic coil and limits unnecessary lateral movement, thereby ensuring the dynamic coil's axial reciprocating motion. As vibration tables gradually develop towards higher thrust, load eccentricity is inevitable in large-scale structural vibration tests, causing the vibration table guide device to bear a large axial load. Under such working conditions, the use of traditional dynamic coil guide devices consisting of adjustable pressure blocks, gears, racks, and other parts has the following problems:

[0004] First, under the action of large axial loads, the wear of the guide device is aggravated, requiring frequent manual monitoring of the wear status, and it is impossible to achieve online automatic monitoring of key wear status;

[0005] Second, after the guide device is worn, manual adjustment and compensation of the wear clearance are required, and the adjustment amount control relies on manual experience;

[0006] Third, there are often differences in the preload conditions among multiple guide devices, which can easily aggravate the wear of some guide devices.

[0007] Therefore, there is an urgent need to invent a dynamic coil guide device that can automatically compensate for wear clearance and adapt to large vibration tables.

[0008] Summary of the Invention

[0009] In response to the above-mentioned technical deficiencies, the purpose of the present invention is to propose a self-compensating large-scale vibration table dynamic coil guide device and a working method thereof, which can solve the problems that under conditions of large axial loads, conventional guide devices are prone to wear and loosening, require manual adjustment, and cannot compensate for wear in real time. It can also monitor the wear of the gear guide wheel mechanism and can provide timely feedback on excessive wear. The present invention also provides a method for using the device.

[0010] In order to solve the above technical problems, the present invention adopts the following technical solutions:

[0011] A self-compensating large vibration table moving coil guide device, comprising:

[0012] The piston cylinder is fixed on a platform located on one side of the dynamic coil. A force transmission component is slidingly provided in a cavity of the piston cylinder adjacent to the dynamic coil. One end of the force transmission component abuts against the piston top plate in the piston cylinder, and the other end extends out of the piston cylinder and is connected to the dynamic coil via a gear guide wheel mechanism. The chamber on the other side of the piston top plate of the piston cylinder is a pressurized chamber, and an oil / gas inlet is provided on the wall of the pressurized chamber.

[0013] An oil / gas compensation pipeline is connected to the oil / gas inlet on the pressurized chamber. A pressure sensor and a micro accumulator are provided in the oil / gas compensation pipeline. The pressure sensor is used to detect the oil pressure or gas pressure in the piston cylinder and supply pressure to the pressurized chamber through the micro accumulator, thereby automatically compensating for the wear of the gear guide wheel mechanism.

[0014] The force transmission component is a one-way force transmission component, comprising:

[0015] A top block, one end of which extends out of the piston cylinder and is fixedly connected to the gear guide wheel mechanism, and the other end of which is located in the piston cylinder and can slide relative to the piston cylinder;

[0016] a wedge block disposed in the piston cylinder and located between the top block and the piston top plate; the wedge block and the cavity wall of the piston cylinder cavity together form a channel, and the channel includes a tapered channel section and a straight section from left to right;

[0017] One end of the top block has a protrusion adapted to the straight-through section and a diameter tapering section matched to the tapered channel. The inclined surface of the diameter tapering section on the top block matches the inclined surface of the tapered channel on the wedge block and forms a small gap d. When the top block is subjected to a horizontal rightward thrust and transmits the thrust to the wedge block, the wedge block is vertically subjected to a force generating a friction force F. s Always greater than the horizontal component F t The contact surface between the wedge and the piston cylinder cavity meets the following friction requirements:

[0018] μ≥tanα,

[0019] Wherein: μ is the relative friction coefficient between the wedge and the piston cylinder cavity; α is the angle between the inclined surface of the tapered channel and the horizontal plane.

[0020] The oil / gas compensation pipeline includes a micro accumulator, a pressure sensor 1, a reversing valve, a pressure sensor 2, a one-way valve, a pipeline 1, and a pipeline 2. The one-way valve is installed on the pressurizing port of the micro accumulator; the oil / gas outlet of the micro accumulator is connected to the oil / gas inlet of the reversing valve through pipeline 1, the pressure sensor 1 is installed on the pipeline 1 between the micro accumulator and the reversing valve, the oil / gas outlet of the reversing valve is connected to pipeline 2 through a pipe joint, and the pressure sensor 2 is connected to pipeline 2 at the oil / gas outlet of the reversing valve through a pipe joint; pipeline 2 at the oil / gas outlet of the reversing valve is connected to the oil / gas inlet of the piston cylinder through a pipe joint; the reversing valve is connected to the output end of the controller; the pressure sensor 1 and the pressure sensor 2 are connected to the input end of the controller.

[0021] It also includes a wear alarm mechanism, which includes a thimble, a housing, a spring, and a metal contact, wherein the right end of the housing is fixedly connected to the lower left end surface of the piston cylinder;

[0022] The ejector pin is made of conductive material, with its left end in contact with the gear guide wheel mechanism, and its right end inserted into a housing made of non-conductive material, with the right end surface of the ejector pin base in contact with the spring;

[0023] The spring is in contact with the right inner wall of the housing;

[0024] The metal contact is located between the left inner wall of the shell and the left annular surface of the ejector base. The two metal contacts are respectively inserted into the upper and lower sides of the shell. The lower end of the metal contact extends into the inner wall of the shell, and the upper end of the metal contact is connected to the wear monitoring alarm circuit.

[0025] The gear guide wheel mechanism comprises:

[0026] A first vertical rack is fixedly connected to one end of the top block adjacent to the moving coil;

[0027] a second vertical rack fixedly connected to the moving coil;

[0028] The gear is connected between the first vertical rack and the second vertical rack and is meshed with the two vertical racks respectively.

[0029] The gap d between the outer edge surface of the top block and the wedge block is 0.1-0.2 mm.

[0030] The horizontal distance between the bottom of the ejector pin and the metal contact point on the inner wall of the shell is 5mm-10mm.

[0031] The present invention further discloses a working method of the self-compensating large-scale vibration table moving coil guide device, comprising the following steps:

[0032] S1. According to the thrust requirements of the electric vibration table, determine the number of circumferential guide devices of the moving coil and the set pressure value P of the pressurized cavity of the piston cylinder on the guide device. low And the guide devices are evenly arranged along the circumference of the moving coil. The specific formula is as follows:

[0033] Where,

[0034] M: anti-overturning moment of the shaking table;

[0035] h: the distance between the upper and lower guide devices; the distance between the upper guide device and the lower guide device of the vibration table. The guide device in this article is the upper guide device;

[0036] S: pressure area of ​​piston top plate;

[0037] S2. Connect the second pipeline of the oil / gas compensation pipeline to the pressurized chambers on all piston cylinders through pipe joints;

[0038] S3, open the reversing valve through the controller, connect the pressure supply unit to the one-way valve port, pressurize the micro accumulator and the pressurizing chamber on all piston cylinders, and when the pressure value fed back by the pressure sensor 2 reaches the set value P low When , the reversing valve is closed through the controller;

[0039] S4, continue to pressurize the micro accumulator, when the pressure value fed back by the pressure sensor reaches the initial setting value P of the micro accumulator high When the pressure reaches 0.0000, stop pressurizing and remove the pressure supply unit;

[0040] S5. During the operation of the vibration table, if the controller detects that the pressure value fed back by the pressure sensor 2 is less than the set threshold value θ low , the controller outputs a signal to control the reversing valve to open, and the micro accumulator pressurizes the pressurized chamber of the piston cylinder. At the same time, the controller continues to monitor the pressure value fed back by the pressure sensor 2. When the pressure value fed back by the pressure sensor 2 reaches the set value P low When , the controller controls the reversing valve to close;

[0041] S6: If the controller detects that the pressure value fed back by the pressure sensor is less than the set threshold value θ high , the controller issues an alarm and reminds the micro accumulator that it needs to be pressurized, otherwise execute step (8);

[0042] S7, connect the pressure supply unit to the one-way valve port to increase the pressure. When the controller detects that the pressure value fed back by the pressure sensor reaches the set value P high When the pressure reaches 0.0000, stop pressurizing and remove the pressure supply unit;

[0043] S8. When the controller detects that the ejector pin base of the wear alarm mechanism contacts the metal contact, the wear monitoring alarm circuit is connected, triggering an alarm to remind the user that the gear guide wheel mechanism is excessively worn and needs to be replaced.

[0044] S9. Repeat the above steps S5-S8.

[0045] The number of the guide devices arranged along the circumferential direction of the moving coil is 4, 6 or 8.

[0046] The initial setting value P of the micro accumulator high The value range is P high =1.3P low ~1.5P low ;

[0047] The pressure value fed back by the pressure sensor sets the threshold θ high The value range is

[0048] θ high =P low ~1.1P low ;

[0049] The pressure value feedback from pressure sensor 2 sets the threshold θ low The value range is

[0050] θ low =0.85P low ~0.9P low .

[0051] The beneficial effects of the present invention are:

[0052] (1) The device of the present invention utilizes the self-locking property of the wedge block during reverse stroke to solve the problem that the existing guide device is offset due to the large axial load, which increases the wear of the vibration table guide device. The present invention utilizes the gap between the wedge block and the top block to enable the oil / gas compensation pipeline to supply pressure to the pressurized chamber of the guide device, thereby providing sufficient preload force.

[0053] (2) The present invention solves the problem that existing guide devices cannot compensate for the wear of the moving coil in real time and still require manual adjustment. The oil / gas compensation pipeline of the present invention can maintain the pressure in the pressurized chamber within a selected range, thereby adaptively compensating for the wear of the gear, limiting the movement of the first rack, and preventing lateral displacement of the gear without relying on manual experience.

[0054] (3) The oil / gas compensation pipeline of the present invention supplies pressure to all guide devices at the same time to ensure that the pressure of each guide device is equal, eliminate the difference in pre-tightening state between multiple guide devices, and reduce the wear of the guide devices.

[0055] (4) The present invention solves the problem that existing guide devices cannot monitor the wear of the moving coil in real time and still require manual monitoring. In the event of excessive gear wear, the pin base of the wear alarm mechanism of the present invention will contact the metal contact, triggering the wear monitoring alarm circuit, issuing an early warning to remind the user that the gear guide wheel mechanism is excessively worn and needs to be replaced, thereby improving the safety of the vibration table guide system.

[0056] (5) The present invention has a simple structure, is easy to operate, convenient to maintain, has strong adaptability, and is highly practical. BRIEF DESCRIPTION OF THE DRAWINGS

[0057] FIG1 is a top view of the vibration table guide device of the present invention.

[0058] FIG2 is a schematic structural diagram of the guide device of the present invention.

[0059] FIG3 is a partial schematic diagram of the guide device of the present invention.

[0060] FIG4 is a schematic diagram of the self-locking force of the wedge block of the present invention.

[0061] FIG5 is an exploded schematic diagram of the top block and wedge block assembly of the present invention.

[0062] FIG6 is a schematic diagram showing the principle of the oil / gas compensation pipeline of the present invention.

[0063] FIG7 is a schematic structural diagram of the wear alarm mechanism of the present invention.

[0064] In the figure: 1. Guide device; 101. Ejector block; 102. Wedge block; 103. Piston top plate; 104. First rack; 105. Second rack; 106. Sealing ring; 107. Gear; 108. Piston cylinder; 2. Oil / gas compensation pipeline; 201. Micro accumulator; 202. Pressure sensor 1; 203. Reversing valve; 204. Pressure sensor 2; 205. One-way valve; 206. Pipeline 1; 207. Pipeline 2; 3. Wear alarm mechanism; 301. Ejector pin; 302. Housing; 303. Spring; 304. Metal contact; 4. Platform; 5. Moving coil. DETAILED DESCRIPTION

[0065] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. 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 making creative efforts are within the scope of protection of the present invention.

[0066] As shown in FIG1 to FIG7 , a self-compensating large-scale vibration table moving coil guide device includes a guide device 1 , an oil / gas compensation pipeline 2 , and a wear alarm mechanism 3 .

[0067] The guide device 1 includes a top block 101, a wedge block 102, a piston top plate 103, a first rack 104, a second rack 105, a sealing ring 106, a gear 107, and a piston cylinder 108. The cross-section of the right end of the top block 101 is a convex structure and is symmetrical about the central axis. The structure is symmetrical along the central axis. This design is reflected in that the angles of the inclined surfaces of the inner walls of the top block 101 and the wedge block 102 relative to their reference planes (horizontal or vertical) are consistent. Specifically, the angles between the upper and lower inclined surfaces of the top block 101 and the horizontal plane, as well as the front and rear inclined surfaces and the vertical plane are equal; similarly, the angles between the upper and lower inclined surfaces of the inner wall of the wedge block 102 and the horizontal plane, as well as the front and rear inclined surfaces and the vertical plane are also equal. A through hole is provided in the wedge block 102. The left end face of the top block 101 is connected to the right end face of the first rack 104, and the top block 101 can only make relative movement along the axial direction of the piston cylinder 108. The right end of the top block 101 is inserted into the piston cylinder 108, and there is a gap between the outer edge of the right end of the top block 101 and the inner wall of the wedge block 102; the piston cylinder 108 is equipped with a piston top plate 103, and the outer edge of the piston top plate 103 and the inside of the piston cylinder 108 are eliminated by a sealing ring 106. The right side of the piston top plate 103 and the inner wall of the piston cylinder 108 form a pressurized chamber, and a pressurized port 1 is provided on the upper right side of the piston cylinder 108; the right plane of the wedge block 102 is connected to the piston top plate 103, and the outer edges of the wedge block 102 are respectively in contact with the inner walls of the piston cylinder 108; the first rack 104 is meshed with the gear 107; the gear 107 is meshed with the second rack 105; the left side of the second rack 105 is fixed to the moving coil 4.

[0068] The oil / gas compensation pipeline 2 includes a micro accumulator 201 , a pressure sensor 1 202 , a reversing valve 203 , a pressure sensor 2 204 , a one-way valve 205 , a pipeline 1 206 , and a pipeline 2 207 . The one-way valve 205 is installed on the pressurizing port 2 of the micro accumulator 201; the oil outlet of the micro accumulator 201 is connected to the oil inlet of the reversing valve 203 through the pipeline 1 206, and the pressure sensor 1 202 is installed on the pipeline 1 206 between the micro accumulator 201 and the reversing valve 203. The oil outlet of the reversing valve 203 is connected to the pipeline 2 207 through a pipe joint, and the pressure sensor 2 204 is connected to the pipeline 2 207 at the oil outlet of the reversing valve through a pipe joint; the pipeline 2 207 at the oil outlet of the reversing valve 203 is connected to the pressurizing port 1 of the piston cylinder 108 through a pipe joint; the reversing valve 203 is connected to the output end of the controller; the pressure sensors 1, 2 202, and 201 are connected to the input end of the controller.

[0069] The wear alarm mechanism 3 comprises a pin 301, a housing 302, a spring 303, and a metal contact 304. The right end of the housing 302 is fixedly connected to the lower left end surface of the piston cylinder 108 of the guide device 1; the left end of the pin 301 contacts the first rack 104, the right end of the pin 301 is inserted into the housing 302, and the right end surface of the base of the pin 301 contacts the spring 303; the spring 303 contacts the right inner wall of the housing 302; the metal contact 304 is located between the left inner wall of the housing 302 and the left annular surface of the base of the pin 301. The two metal contacts 304 are inserted into the upper and lower sides of the housing 302, with the lower ends of the metal contacts 304 extending into the inner wall of the housing 302 and the upper ends of the metal contacts 304 connected to the wear monitoring alarm circuit.

[0070] As a preferred embodiment of the present invention, the piston cylinder 108 is a square shell.

[0071] As shown in FIG4 , the force analysis of the wedge block 102 shows that when the top block 101 is subjected to a horizontal rightward thrust and transmits the thrust to the wedge block 102, the wedge block 102 is subjected to a vertical force F N缸体 The friction force F s Always greater than the force F transmitted to the wedge by the above thrust N顶块 The horizontal component of force F t , so the contact plane between the wedge 102 and the inner cavity of the piston cylinder 108 meets the following friction requirements:

[0072] μ≥tanα

[0073] Wherein: μ is the relative friction coefficient between the outer edge surface of the wedge block 102 and the inner wall of the piston cylinder 108; α is the angle between the inclined surface of the inner wall of the wedge block 102 and its reference plane (horizontal plane, vertical plane).

[0074] The through hole of the wedge block 102 is a square hole or a round hole.

[0075] The gap between the outer edge surface of the top block 101 and the inner wall of the wedge block 102 is 0.1-0.2 mm.

[0076] The ejector pin 301 is made of conductive material.

[0077] The distance between the bottom of the ejector pin 301 and the metal contact 304 on the inner wall of the housing 302 is 5 mm to 10 mm.

[0078] In this embodiment, the second rack 105, the gear 107, the piston cylinder 108, the micro accumulator 201, the pressure sensor 1 202, the reversing valve 203, the pressure sensor 2 204, the one-way valve 205, the pipeline 1 206, the pipeline 2 207, and the housing 302 adopt existing products or structures well known to those skilled in the art, and the connection method between them also adopts the existing connection method well known to those skilled in the art, and will not be described in detail here.

[0079] The present invention provides a method for using a self-compensating large-scale vibration table moving coil guide device, comprising the following steps:

[0080] a) According to the thrust requirements of the electric vibration table, determine the number of circumferential guide devices 1 arranged in the dynamic coil 4 and the set pressure value P of the pressurized cavity of the piston cylinder 108 on the guide device 1. low And the guide device 1 is evenly arranged along the circumference of the moving coil 4. The specific formula is as follows:

[0081] Where,

[0082] M: anti-overturning moment of the shaking table;

[0083] h: the distance between the upper and lower guide devices; the distance between the upper guide device and the lower guide device of the vibration table. The guide device in this article is the upper guide device;

[0084] S: pressure area of ​​piston top plate 103;

[0085] b) Connect the pipe 206 of the wear drive module 2 to the pressure port of the piston cylinder 108 on all guide devices 1 through a pipe joint;

[0086] c) Open the reversing valve 203 through the controller, connect the pressure supply unit to the valve port of the one-way valve 205, and pressurize the pressurized chambers of the micro accumulator 201 and the piston cylinder 108 on all guide devices 1. When the pressure value fed back by the pressure sensor 204 reaches the set value P low When , the reversing valve 203 is closed by the controller;

[0087] d) Continue to pressurize the micro accumulator 201. When the pressure value fed back by the pressure sensor 202 reaches the initial setting value P of the micro accumulator 201, high When the pressure reaches 0.0000, stop pressurizing and remove the pressure supply unit;

[0088] e) During the operation of the vibration table, if the controller detects that the pressure value fed back by the pressure sensor 204 is less than the set threshold value θ low , the controller outputs a signal to control the reversing valve 203 to open, and the micro accumulator 201 pressurizes the piston cylinder 108. At the same time, the controller continues to monitor the pressure value fed back by the pressure sensor 204. When the pressure value fed back by the pressure sensor 204 reaches the set value P low When , the controller controls the reversing valve 203 to close;

[0089] f) If the controller detects that the pressure value fed back by the pressure sensor 202 is less than the set threshold value θ high, the controller issues an alarm and reminds the micro accumulator 201 that it needs to be pressurized, and executes step (g); otherwise, executes step (h);

[0090] g) Connect the pressure supply unit to the one-way valve 205 to increase the pressure. When the controller detects that the pressure value fed back by the pressure sensor 202 reaches the set value P, high When the pressure reaches 0.0000, stop pressurizing and remove the pressure supply unit;

[0091] h) When the controller detects that the base of the ejector pin 301 of the wear alarm mechanism 3 is in contact with the metal contact 304, the wear monitoring alarm circuit is connected, triggering an alarm to remind that the gear 107 is too worn and needs to be replaced;

[0092] i) Repeat the above steps (e)-(h).

[0093] In this embodiment, the number of guide devices 1 arranged along the circumferential direction of the moving coil 5 is four.

[0094] In this embodiment, the oil / gas compensation pipeline 2 is pressurized by air pressure or hydraulic pressure.

[0095] The initial setting value P of the micro accumulator 201 in this embodiment high The value range is P high =1.3P low ~1.5P low .

[0096] The pressure value fed back by the pressure sensor 201 in this embodiment is used to set the threshold value θ high The value range is θ high =P low ~1.1P low The pressure value fed back by the pressure sensor 202 sets the threshold value θ low The value range is θ low =0.85P low ~0.9P low .

[0097] Obviously, those skilled in the art may make various changes and modifications to the present invention without departing from the spirit and scope of the present invention. Thus, if such changes and modifications fall within the scope of the claims and their equivalents, the present invention is intended to include such changes and modifications.

Claims

1. A self-compensating large vibration table moving coil guide device, comprising: The piston cylinder is fixed on a platform located on one side of the moving coil, and a force transmission component is slidably arranged in a cavity of the piston cylinder adjacent to the moving coil. One end of the force transmission component abuts against a piston top plate in the piston cylinder, and the other end extends out of the piston cylinder and is connected to the moving coil through a gear guide wheel mechanism. The chamber on the other side of the piston top plate on the piston cylinder is a pressurized chamber, and an oil / gas inlet is arranged on the chamber wall of the pressurized chamber. An oil / gas compensation pipeline is connected to the oil / gas inlet on the pressurizing chamber. A pressure sensor and a micro accumulator are provided in the oil / gas compensation pipeline. The pressure sensor is used to detect the oil pressure or gas pressure in the piston cylinder and supply pressure to the pressurizing chamber through the micro accumulator, thereby automatically compensating for the wear of the gear guide wheel mechanism.

2. The self-compensating large-scale vibration table dynamic guide device according to claim 1 is characterized in that: The force transmission component is a one-way force transmission component, comprising: A top block, one end of which extends out of the piston cylinder and is fixedly connected to the gear guide wheel mechanism, and the other end of which is located in the piston cylinder and can slide relative to the piston cylinder; A wedge block is arranged in the piston cylinder and between the top block and the piston top plate. The wedge block and the cavity wall of the piston cylinder cavity together form a channel. The channel includes a tapered channel section and a straight-through section from left to right; One end of the top block has a protrusion matched with the straight-through section and a diameter tapering section matched with the tapering channel. The inclined surface of the diameter tapering section on the top block matches the inclined surface of the tapering channel on the wedge block and forms a small gap d. When the top block is subjected to a horizontal rightward thrust and transmits the thrust to the wedge block, the wedge block is subjected to a vertical force to generate a friction force F. s Always greater than the horizontal force F t The contact plane between the wedge and the piston cylinder cavity meets the following friction requirements: μ ≥ tanα, Wherein: μ is the relative friction coefficient between the wedge block and the inner cavity of the piston cylinder; α is the angle between the inclined surface of the tapered channel and the horizontal plane.

3. The self-compensating large-scale vibration table dynamic guide device according to claim 1 is characterized in that: The oil / gas compensation pipeline includes a micro accumulator, a pressure sensor 1, a reversing valve, a pressure sensor 2, a one-way valve, a pipeline 1, and a pipeline 2. The one-way valve is installed on the pressurizing port of the micro accumulator; the oil / gas outlet of the micro accumulator is connected to the oil / gas inlet of the reversing valve through a pipeline 1, the pressure sensor 1 is installed on the pipeline 1 between the micro accumulator and the reversing valve, the oil / gas outlet of the reversing valve is connected to the pipeline 2 through a pipe joint, and the pressure sensor 2 is connected to the pipeline 2 at the oil / gas outlet of the reversing valve through a pipe joint; the pipeline 2 at the oil / gas outlet of the reversing valve is connected to the oil / gas inlet of the piston cylinder through a pipe joint; the reversing valve is connected to the output end of the controller; the pressure sensor 1 and the pressure sensor 2 are connected to the input end of the controller.

4. The self-compensating large-scale vibration table dynamic guide device according to claim 1 is characterized in that: It also includes a wear alarm mechanism, wherein the wear alarm mechanism (3) includes a pin (301), a housing (302), a spring (303) and a metal contact (304), wherein the right end of the housing (302) is fixedly connected to the lower left end surface of the piston cylinder body; The ejector pin (301) is made of conductive material, the left end of which contacts the gear guide wheel mechanism, the right end of which is inserted into a housing (302) made of non-conductive material, and the right end surface of the base of the ejector pin (301) contacts the spring (303); The spring (303) is in contact with the right inner wall of the housing (302); The metal contact (304) is located between the left inner wall of the shell (302) and the left annular surface of the base of the ejector pin (301). The two metal contacts (304) are respectively inserted into the upper and lower sides of the shell (302). The lower ends of the metal contacts (304) extend into the inner wall of the shell (302). The upper end of the contact (304) is connected to the wear monitoring alarm circuit.

5. The self-compensating large-scale vibration table dynamic guide device according to claim 2 is characterized in that: The gear guide wheel mechanism comprises: A first vertical rack, fixedly connected to one end of the top block adjacent to the moving coil; A second vertical rack, fixedly connected to the moving coil; The gear is connected between the first vertical rack and the second vertical rack and is meshed with the two vertical racks respectively.

6. The self-compensating large-scale vibration table dynamic guide device according to claim 2 is characterized in that: The gap d between the outer edge surface of the top block and the wedge block is 0.1-0.2 mm.

7. The self-compensating large-scale vibration table moving coil guide device according to claim 4 is characterized in that: The horizontal distance between the bottom of the ejector pin and the metal contact point on the inner wall of the housing is 5 mm-10 mm.

8. The working method of the self-compensating large-scale vibration table dynamic guide device according to any one of claims 3 to 7, characterized in that: The following steps are involved: S1. According to the thrust requirements of the electric vibration table, determine the number of circumferential guide devices of the moving coil and the set pressure value P of the pressurized cavity of the piston cylinder on the guide device. low , and arrange the guide device evenly along the circumference of the moving coil. The specific formula is as follows: In the formula, M: anti-overturning moment of the shaking table; h: the distance between the upper and lower guide devices; the distance between the upper guide device and the lower guide device of the vibration table. The guide device in this article is the upper guide device; S: pressure area of ​​piston top plate; S2. Connect the second pipeline of the oil / gas compensation pipeline to the pressurized chambers on all piston cylinders through pipe joints; S3, open the reversing valve through the controller, connect the pressure supply unit to the one-way valve port, pressurize the micro accumulator and the pressurizing chamber on all piston cylinders, and when the pressure value fed back by the pressure sensor 2 reaches the set value P low When the reversing valve is closed, the controller is used to close the reversing valve; S4, continue to pressurize the micro accumulator, when the pressure value fed back by the pressure sensor reaches the initial setting value P of the micro accumulator high When the pressure is too high, stop pressurizing and remove the pressure supply unit; S5. During the operation of the vibration table, if the controller detects that the pressure value fed back by the pressure sensor 2 is less than the set threshold value θ low , the controller outputs a signal to control the reversing valve to open, and the micro accumulator pressurizes the pressurized chamber of the piston cylinder. At the same time, the controller continues to monitor the pressure value fed back by the pressure sensor 2. When the pressure value fed back by the pressure sensor 2 reaches the set value P low When , the controller controls the reversing valve to close; S6. If the controller detects that the pressure value fed back by the pressure sensor is less than the set threshold value θ high , the controller sounds an alarm and reminds the micro accumulator that it needs to be pressurized, otherwise, execute step (8); S7, connect the pressure supply unit to the one-way valve port to increase the pressure. When the controller detects the pressure feedback from the pressure sensor, The force reaches the set value P high When the pressure is too high, stop pressurizing and remove the pressure supply unit; S8, when the controller detects that the ejector base of the wear alarm mechanism is in contact with the metal contact, the wear monitoring alarm circuit is connected, triggering an alarm to remind that the gear guide wheel mechanism is too worn and needs to be replaced; S9. Repeat the above steps S5 to S8.

9. The working method of the self-compensating large-scale vibration table dynamic guide device according to claim 8 is characterized in that: The number of the guide devices arranged along the circumferential direction of the moving coil is 4, 6 or 8.

10. The working method of the self-compensating large-scale vibration table dynamic guide device according to claim 9, characterized in that: The initial setting value P of the micro accumulator high The value range is P high =1.3P low ~1.5P low ; The pressure value fed back by the pressure sensor sets the threshold value θ high The value range is θ high =P low ~1.1P low ; The pressure value fed back by the pressure sensor 2 sets the threshold value θ low The value range is θ low =0.85P low ~0.9P low .

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