High-precision synchronous multi-stage telescopic electric support stand column

Abstract

The invention relates to a high-precision synchronous multi-stage telescopic electric support stand column, and belongs to the technical field of hydraulic supports. The stand column is of a multi-stage thread meshing transmission structure, a square shaft type power transmitter is driven through a double-output-shaft synchronous motor, zero-clearance power transmission is achieved in combination with an interference locking plug pin, and synchronous stretching and retracting of the stand column are achieved. The synchronous controller adjusts the rotating speed of the motor in real time through feedback of an encoder, and synchronous multi-stage stretching is ensured. The bottom end hemispherical base type fixed cylinder barrel is matched with a spherical groove of the integrated protection box body, and the stand column is allowed to deflect to adapt to a dynamic load; the dustproof sealing ring is fixedly installed at the top end of the fixed cylinder barrel and the top end of the first-stage telescopic rod through bolts to form dynamic sealing, the protection grade is larger than or equal to IP65, and dust invasion is effectively isolated. Mechanical transmission is used for replacing a hydraulic system, the leakage risk is thoroughly eliminated, and the device has the advantages of being long in stroke (larger than or equal to 2 m), high in precision and high in environmental adaptability and is suitable for complex working conditions such as coal mine supporting and tunnel engineering.

Description

Technical Field

[0001] The present invention belongs to the technical field of hydraulic supports, and specifically relates to a high-precision synchronous multi-stage telescopic electric support column. Through the coordinated design of a square shaft power transmitter, an interference locking pin and a dustproof sealing ring, the problems of leakage and poor synchronization of traditional hydraulic support columns are solved, and the hydraulic support column is suitable for dynamic load scenarios such as underground coal mines and tunnel engineering. Background Art

[0002] Traditional column lifting devices mostly use hydraulic drive or single-stage mechanical transmission, which has problems such as large size, low adjustment accuracy, and easy leakage. Some motor drive solutions rely on a single telescopic rod, which has limited travel and poor synchronization. The stroke of traditional single-stage hydraulic support columns is usually 1m, which is difficult to meet the needs under complex working conditions. In addition, the leakage problem of the hydraulic system not only affects the performance of the equipment, but also pollutes the environment. Although the existing mechanical transmission solution avoids the leakage problem of the hydraulic system, it still has shortcomings in synchronization and vibration resistance. Therefore, it is necessary to design a new support column solution that can provide long travel, high-precision synchronous control, and adapt to dynamic load changes.

[0003] The patent document "Hydraulic support column with internal circulation medium replacement" (CN201810749372.2) discloses a hydraulic support column with internal circulation medium replacement. The invention is to realize the automatic replacement of liquid in the hydraulic support column without affecting the normal operation of the hydraulic support, increase the fluidity of the hydraulic medium inside the column, reduce medium deterioration, reduce the occurrence of corrosion, and improve the service life of the hydraulic support. This patent adopts a dual-output shaft synchronous motor to drive a multi-stage threaded meshing transmission, completely abandoning hydraulic oil and eliminating the risk of leakage. Summary of the invention

[0004] In view of the technical defects of traditional hydraulic support columns, the purpose of the present invention is to provide a high-precision synchronous multi-stage telescopic electric support column, which adopts mechanical transmission, does not require hydraulic oil, completely eliminates the risk of leakage, is environmentally friendly and safe, and the multi-stage threaded engagement structure enables the stroke to reach more than twice that of the traditional structure (≥2m), and the stability is significantly better than the hydraulic drive solution.

[0005] In order to achieve the above-mentioned purpose, the present invention provides a high-precision synchronous multi-stage telescopic electric support column, including: a hemispherical base type fixed cylinder, a composite first-stage telescopic rod with internal and external threads, a second-stage telescopic rod with external thread linkage, a dual-output shaft synchronous motor, a square shaft power transmitter, an interference locking pin, a bidirectional power conversion bevel gear set, a dustproof sealing ring, an integrated protective box, a synchronous controller and a bearing seat. The bottom end of the hemispherical base type fixed cylinder is a hemispherical structure; the outer wall of the bottom end of the composite first-stage telescopic rod with internal and external threads is provided with an external thread, which meshes with the internal thread of the fixed cylinder; the center of the bottom end of the first-stage telescopic rod is provided with a square through hole, which is interference fit with the square shaft power transmitter; the top end is an internal thread structure, which meshes with the second-stage telescopic rod with external thread linkage; the outer wall of the bottom end of the second-stage telescopic rod with external thread linkage is provided with an external thread, which meshes with the internal thread of the first-stage telescopic rod; the top end of the second-stage telescopic rod with external thread linkage is provided with a pin hole, and only the axial force is transmitted through the connection between the pin and the bracket top beam ear plate; the dual-output shaft synchronous electric The machine is arranged at the center of the integrated protection box, and drives the square shaft power transmitters on both sides through the bevel gear set; the dustproof sealing ring is fixedly installed on the top of the fixed cylinder and the top of the first-level telescopic rod by bolts respectively; the integrated protection box is made of high-strength aluminum alloy in one-piece casting, and the dual-output shaft synchronous motor, bevel gear set, synchronous controller and bearing seat are arranged in the center of the interior, and the synchronous controller is fixed to the inner wall of the box by bolts, located just in front of the dual-output shaft synchronous motor, and arranged in parallel along the longitudinal center axis of the box; the bearing seat is fixed to the box by high-strength bolts, and is used to support the dual-output shaft synchronous motor and the bevel gear set.

[0006] The interference locking pin is assembled by inserting one end into the output hole of the bevel gear set and pressing the other end into the groove of the square shaft power transmitter. The matching tolerance is H7 / s6, which eliminates the transmission clearance and improves the anti-vibration performance. The axial positioning accuracy is ≤0.05mm.

[0007] The deflection of the hemispherical base type fixed cylinder is achieved by the cooperation between the hemispherical structure at the bottom and the spherical groove of the integrated protection box, allowing the column to deflect as a whole by ±3°. The bracket base is rigidly connected to the integrated protection box by high-strength bolts to form a fixed support structure.

[0008] The dustproof sealing ring includes a first dustproof sealing ring and a second dustproof sealing ring. The first dustproof sealing ring is fixedly installed on the top of the fixed cylinder by bolts, and its inner ring is elastically compressed and fitted with the outer ring at the top of the first-level telescopic rod; the second dustproof sealing ring is fixedly installed on the top of the first-level telescopic rod by bolts, and its inner ring is elastically compressed and fitted with the outer ring at the top of the second-level telescopic rod.

[0009] The synchronous controller collects the speed signals of the photoelectric encoders on both sides of the dual-output shaft synchronous motor in real time, calculates the real-time displacement of the primary telescopic rod and the secondary telescopic rod through the thread lead, and dynamically adjusts the output torque of the dual-output shaft synchronous motor based on the displacement difference, so that the displacement synchronization error of the telescopic rods on both sides is ≤±0.5mm.

[0010] The advantages of the present invention are as follows: 1. Through the coordinated work of the dual-output shaft synchronous motor and the synchronous controller, the motor speed is adjusted in real time in combination with encoder feedback to ensure the synchronization of multi-stage telescopic movement. This high-precision synchronous control significantly improves the stability and reliability of the support column, and is suitable for complex working conditions that require precise adjustment; 2. The present invention adopts a mechanical transmission structure to completely eliminate the leakage risk of traditional hydraulic systems. Through the multi-stage threaded engagement transmission structure and the interference locking pin, zero-gap power transmission is achieved, the durability and environmental adaptability of the system are improved, and it is especially suitable for harsh environments such as coal mine support and tunnel engineering; 3. Through the multi-stage threaded engagement structure, the stroke of the support column can reach more than twice that of the traditional structure (≥2m). At the same time, the matching design of the bottom hemispherical base fixed cylinder and the spherical groove of the integrated protective box can adapt to dynamic load changes and enhance the flexibility and adaptability of the system. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for describing the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative work. Figure 1 A cross-sectional view of the assembly of the double columns and the integrated protection box; Figure 2 This is the overall structure diagram; Figure 3 This is a full cross-sectional view of a hemispherical base-type fixed cylinder; Figure 4 It is a cross-sectional view of a composite primary telescopic rod with internal and external threads; Figure 5 This is a full cross-sectional view of the external thread linkage secondary telescopic rod; Figure 6 A cross-sectional view of the bevel gear driving the primary telescopic rod; Figure 7 A cross-sectional view of the interference locking pin and the square shaft power transmitter; Figure 8 This is a diagram of the interior of the integrated protection box.

[0012] The following is a supplementary explanation of the attached drawings: 1. Hemispherical base fixed cylinder; 2. Internal and external thread composite first-level telescopic rod; 3. External thread linkage second-level telescopic rod; 3-1. Pin shaft hole; 4. Dual output shaft synchronous motor; 5. Square shaft power transmission - device; 6. Interference locking pin; 7. Bidirectional power conversion bevel gear set; 8. Dustproof sealing ring; 8-1. First dustproof sealing ring; 8-2. Second dustproof sealing ring; 9. Integrated protective box; 10. Synchronous controller; 11. Bearing seat; 12. Bracket base; 13. Bracket top beam ear plate. DETAILED DESCRIPTION

[0013] The present invention will be further described below in conjunction with the embodiments of the present invention, and the technical solutions in the embodiments of the present invention will be clearly and completely described. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than 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, any modifications, equivalent substitutions, improvements, etc., should be included in the protection scope of the present invention.

[0014] In the description of the present invention, it is to be understood that the orientation or positional relationship indicated by the terms "upper", "lower", "top", "bottom", etc. is based on the orientation or positional relationship shown in the accompanying drawings, which is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation of the present invention. In addition, the terms "first", "second", etc. are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. Moreover, the terms "vertical", "horizontal", "first", "second", etc. are used to distinguish similar objects, and are not necessarily used to describe specific spatial positions or sequential orders. It should be understood that the data used in this way can be interchangeable where appropriate, so that the embodiments of the present invention described herein can be implemented in an order other than those illustrated or described herein.

[0015] See also Figures 1 to 8 The invention discloses a high-precision synchronous multi-stage telescopic electric support column, which is mainly used in dynamic load scenarios such as underground coal mine support and tunnel engineering, and provides an efficient and reliable solution for structural support under complex working conditions. The core of the invention is to break through the limitations of the traditional hydraulic drive system through an innovative mechanical transmission architecture.

[0016] See also Figures 1 to 8A high-precision synchronous multi-stage telescopic electric support column of the present invention is described in detail. The technical solution adopted by the present invention is as follows: a high-precision synchronous multi-stage telescopic electric support column, comprising: a hemispherical base fixed cylinder 1, an internal and external thread composite first-stage telescopic rod 2, an external thread linkage second-stage telescopic rod 3, a dual-output shaft synchronous motor 4, a square shaft power transmitter 5, an interference locking pin 6, a bidirectional power conversion bevel gear set 7, a dustproof sealing ring 8, an integrated protective box 9, a synchronous controller 10 and a bearing seat 11. The hemispherical base type fixed cylinder 1 is located at the bottom of the column, and the hemispherical structure at the bottom end cooperates with the spherical groove at the top of the integrated protection box 9, allowing the column to deflect ±3° as a whole to adapt to dynamic loads; the external thread at the bottom end of the internal and external thread composite primary telescopic rod 2 is meshed with the internal thread of the fixed cylinder 1, and the internal thread at the top end is connected with the external thread of the secondary telescopic rod 3 to form a primary telescopic structure; the external thread at the bottom end of the secondary telescopic rod 3 linked to the external thread is meshed with the primary telescopic rod 2, and the top end of the secondary telescopic rod 3 linked to the external thread is provided with a pin shaft hole 3-1, which is connected to the bracket top beam ear plate 3 through a pin shaft, and can only move in the axial direction, thereby realizing secondary telescopic; the dustproof sealing ring 8 It includes a primary dustproof sealing ring 8-1 and a secondary dustproof sealing ring 8-2. The dustproof sealing ring 8-1 is fixedly installed on the top of the fixed cylinder 1 by bolts, and its outer ring is tightly fitted with the outer wall of the top of the fixed cylinder 1. The inner ring is elastically compressed with the outer ring of the top of the primary telescopic rod 2 to ensure that the primary telescopic rod 2 maintains a dynamic seal with the sealing ring during the telescopic process; the dustproof sealing ring 8-2 is fixedly installed on the top of the primary telescopic rod 2 by bolts, and its outer ring is tightly fitted with the outer wall of the top of the primary telescopic rod 2 with internal and external threads, and the inner ring is elastically compressed with the outer ring of the top of the secondary telescopic rod 3 to ensure that the secondary telescopic rod 3 maintains a dynamic seal with the sealing ring during the telescopic process. The sealing ring is made of a composite material of nitrile rubber and polyurethane, which has both wear resistance and elasticity, can adapt to the reciprocating motion of the telescopic rod, and the protection level is ≥ IP65. The integrated protection box 9 adopts a high-strength aluminum alloy integrated casting process, and the internal layout is based on a modular symmetrical design. The bracket base 12 is rigidly connected to the integrated protection box 9 by high-strength bolts to form a fixed support structure.

[0017] The bottom of the fixed cylinder 1 is a hemispherical structure, and the mating surface with the spherical groove of the integrated protection box 9 is coated with a wear-resistant lubricating coating (such as molybdenum disulfide) to reduce friction resistance. The inner wall of the cylinder is processed with an internal thread, which precisely meshes with the external thread of the primary telescopic rod 2 to ensure smooth telescopic action; the composite primary telescopic rod with internal and external threads is an integrated welded structure, the bottom external thread meshes with the internal thread of the fixed cylinder 1, the thread lead is precisely designed, the top internal thread meshes with the external thread of the secondary telescopic rod 3, the thread pair surface is hardened, and the wear-resistant life is ≥50,000 cycles; the bottom external thread of the external thread linkage secondary telescopic rod 3 meshes with the internal thread of the primary telescopic rod 2, the pin passes through the pin hole 3-1 at the top of the secondary telescopic rod 3, and is aligned with the corresponding hole position on the bracket top beam ear plate 13, and is fixed by the pin. When the primary telescopic rod rotates and moves axially, the thread meshing of the secondary telescopic rod is driven, but because the pin is connected to the bracket top beam ear plate 13, it can only move axially, completely limiting the rotational freedom of the secondary telescopic rod 3.

[0018] The dual-output shaft synchronous motor 4 is arranged at the central position inside the integrated protective box 9, and the power is transmitted to the square shaft power transmitters on both sides through the bidirectional power conversion bevel gear set 7 to realize bidirectional synchronous drive; the active bevel gear of the bidirectional power conversion bevel gear set 7 is keyed to the motor output shaft, and the driven bevel gear is fixed to the square shaft power transmitter 5 through the interference locking pin 6 to realize torque transmission, and the square shaft of the square shaft power transmitter 5 is inserted into the square through hole at the bottom end of the internal and external threaded composite primary telescopic rod 2, driving the primary telescopic rod 2 to rotate synchronously.

[0019] One end of the interference locking pin 6 is inserted into the output hole of the bevel gear set 7, and the other end is pressed into the groove of the square shaft power transmitter 5. The matching tolerance is H7 / s6, and the axial positioning accuracy is ≤0.05mm. The surface of the pin is carburized, with a hardness of ≥HRC58, ensuring that the anti-vibration performance is improved by 30%.

[0020] The integrated protective box 9 contains a dual-output shaft synchronous motor 4, a synchronous controller 10, a bevel gear set 7 and a bearing seat 11; the inner wall of the box 9 is provided with cooling fins and air guide ducts, combined with a forced air cooling system to ensure the heat dissipation efficiency of the motor and controller and avoid overheating; the outer surface is sprayed with an anti-corrosion coating to adapt to high humidity environments. The synchronous controller 10 is located in front of the dual-output shaft synchronous motor 4, arranged in parallel along the longitudinal center axis of the box 9, and is directly fixed to the inner wall of the box by four groups of M8 high-strength bolts, ensuring that the axial spacing between the synchronous controller 10 and the motor 4 is ≤50mm, and the photoelectric encoder signal is collected by the shortest path, and the heat dissipation efficiency is optimized by the heat dissipation fins and the guide air duct on the inner wall of the box to ensure control stability; the synchronous controller 10 collects the speed signals of the photoelectric encoders on both sides of the dual-output shaft synchronous motor 4 in real time, calculates the real-time displacement of the internal and external thread composite first-level telescopic rod 2 and the external thread linkage second-level telescopic rod 3 through the thread lead, and dynamically adjusts the output torque of the dual-output shaft synchronous motor 4 based on the displacement difference, so that the displacement synchronization error of the telescopic rods on both sides is ≤±0.5mm; when the displacement difference exceeds the preset threshold, the synchronous controller 10 triggers an emergency braking signal, stops the motor operation and locks the thread pair to prevent structural damage; the bearing seat 11 is fixed to the box by high-strength bolts to support the dual-output shaft synchronous motor 4 and the bevel gear set 7.

[0021] How it works Working principle: This patent invention drives the bevel gear set through a dual-output shaft synchronous motor, driving the square shaft power transmitter to rotate the composite first-stage telescopic rod with internal and external threads, and uses the meshing of its external thread with the internal thread of the hemispherical base type fixed cylinder to promote axial extension and contraction; at the same time, the internal thread at the top of the first-stage telescopic rod drives the external thread of the second-stage telescopic rod, and through the connection with the bracket top beam ear plate, its rotational freedom is limited, forcing the external thread to link the second-stage telescopic rod to move only axially, realizing multi-stage synchronous extension and contraction. The control system receives the encoder signal through the synchronous controller, dynamically adjusts the motor torque to maintain telescopic synchronization, and uses the locking pin to eliminate the transmission gap to improve the positioning accuracy. The hemispherical structure at the bottom of the fixed cylinder cooperates with the groove of the protective box body to allow the column to deflect to adapt to load changes. The dustproof sealing ring realizes dynamic sealing through elastic compression to ensure the stable operation of the system in complex environments.

Claims

1. A high-precision synchronous multi-stage telescopic electric support column, comprising: A hemispherical base fixed cylinder (1), an internal and external thread composite primary telescopic rod (2), an external thread linkage secondary telescopic rod (3), a dual output shaft synchronous motor (4), a square shaft power transmitter (5), an interference locking pin (6), a bidirectional power conversion bevel gear set (7), a dustproof sealing ring (8), an integrated protective box (9), a synchronous controller (10) and a bearing seat (11). The hemispherical base type fixed cylinder (1) has a hemispherical structure at the bottom end; the inner and outer thread composite primary telescopic rod (2) has an outer thread on the outer wall at the bottom end, which meshes with the inner thread of the fixed cylinder (1); a square through hole is provided at the center of the bottom end of the primary telescopic rod (2), which is interference fit with the square shaft type power transmitter (5); the top end is an inner thread structure, which meshes with the outer thread linkage secondary telescopic rod (3); the outer wall at the bottom end of the outer thread linkage secondary telescopic rod (3) has an outer thread, which meshes with the inner thread of the primary telescopic rod (2); the top end of the outer thread linkage secondary telescopic rod (3) has a pin hole (3-1), which is connected to the bracket top beam ear plate (3) through the pin; the dual output shaft synchronous motor (4) is arranged in the center of the integrated protection box (9) The bevel gear set (7) is located at the center position of the housing (9), and the power is transmitted to the square shaft power transmitters (5) on both sides through the bevel gear set (7); the dustproof sealing ring (8) is fixedly mounted on the top of the fixed cylinder (1) and the top of the first telescopic rod (2) by bolts respectively; the integrated protection housing (9) is made of high-strength aluminum alloy and is integrally cast, and the dual-output shaft synchronous motor (4), the bevel gear set (7), the synchronous controller (10) and the bearing seat (11) are arranged in the center of the housing (9); the synchronous controller (10) is fixed to the inner wall of the housing (9) by bolts, and is located in front of the dual-output shaft synchronous motor (4), and is arranged in parallel along the longitudinal center axis of the housing (9); the bearing seat (11) is fixed to the housing by high-strength bolts, and is used to support the dual-output shaft synchronous motor (4) and the bevel gear set (7).

2. The mechanical support column according to claim 1, characterized in that: The interference locking pin (6) is assembled in such a way that one end is inserted into the output hole of the bevel gear set (7), and the other end is interference-fitted with the groove of the square shaft power transmitter (5), thereby eliminating transmission clearance and improving anti-vibration performance, and the axial positioning accuracy is ≤0.05mm. The driving gear of the bidirectional power conversion bevel gear set (7) is key-connected with the motor output shaft, and the driven gear is fixed to the square shaft power transmitter (5) through the interference locking pin (6).

3. The mechanical support column according to claim 1, characterized in that: The deflection of the hemispherical base type fixed cylinder (1) is achieved by the cooperation between the hemispherical structure at the bottom and the spherical groove of the integrated protection box (9), allowing the column to deflect as a whole by ±3°; the bracket base (12) is rigidly connected to the integrated protection box (9) by high-strength bolts to form a fixed support structure.

4. The mechanical support column according to claim 1, characterized in that: The dustproof sealing ring (8) comprises a first dustproof sealing ring (8-1) and a second dustproof sealing ring (8-2); the first dustproof sealing ring (8-1) is fixedly mounted on the top of the fixed cylinder (1) by means of bolts, and its inner ring is elastically compressed and fitted with the outer ring at the top of the first telescopic rod (2); the second dustproof sealing ring (8-2) is fixedly mounted on the top of the first telescopic rod (2) by means of bolts, and its inner ring is elastically compressed and fitted with the outer ring at the top of the second telescopic rod (3).

5. The mechanical support column according to claim 1, characterized in that: The synchronous controller (10) collects speed signals of photoelectric encoders on both sides of the dual-output shaft synchronous motor (4) in real time, calculates the real-time displacement of the primary telescopic rod (2) and the secondary telescopic rod (3) through the thread lead, and dynamically adjusts the output torque of the dual-output shaft synchronous motor (4) based on the displacement difference, so that the displacement synchronization error of the telescopic rods on both sides is ≤±0.5 mm.

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