CN108121254B - Electric gear shifting castor - Google Patents

Abstract

The invention provides an electric gear shifting caster which comprises a slip ring, a sleeve, a bearing assembly, a bracket, a fluted disc shaft, a tooth seat, a tooth cover, a wheel A, a wheel B, a braking plate, a baffle, a compression spring, a box assembly and a control module. The box assembly comprises a box seat, a box cover, a torsion spring, a large fluted disc, a plastic eccentric wheel, a flat key, a connecting rod A, a connecting rod B, a connecting rod C, a pinion, a threaded sleeve, a small bearing, a bearing support, an n-type guide shaft and a gear motor. The device only needs to provide a 24V or 36V direct current power supply as a power source, and realizes random switching of three gears of static, universal and straight running of the caster by controlling the switch button of the gear motor. The intelligent mobile device has the advantages of compact structure, high response speed and very humanization, and provides convenience for realizing the intellectualization of various medical mobile devices in the future.

Description

An electric shift caster

Technical field

The invention belongs to the field of medical machinery research, and specifically relates to a bevel gear electric shift caster.

Background technique

According to statistics, there are about 150,000 types of casters with different characteristics in various industries around the world. They are widely used, which prompts people to constantly invent casters to meet the different requirements of different fields. Nowadays, with the advancement of science and technology, people are beginning to desire mobile devices to achieve intelligent operations, especially in the field of medical devices.

Currently, the central control caster from Taiwan, China, with the authorization announcement number CN202656787 U, has a complex control system structure, high cost, and many parts. In order to facilitate medical staff and even patients themselves, they can independently operate hospital beds, wheelchairs, and emergency vehicles. and other equipment, the casters equipped on these equipment need to be able to achieve electric control.

Contents of the invention

The purpose of the present invention is to propose a solution to the above problems, that is, a brand new electric shift caster. Medical staff or patients can control the caster through buttons or even intelligent voice, thereby realizing the realization of mobile devices equipped with the caster. Three functions: stationary, straight and universal.

The technical solution of the present invention is: an electric shift caster, including a slip ring, a sleeve, a bearing assembly, a bracket, a gear disc shaft, a gear seat, a gear cover, a wheel A, a wheel B, a brake plate, a baffle, and an elastic component. , box components and control modules;

The box assembly includes a box base, a box cover, a torsion spring, a gear plate, an eccentric wheel, connecting rod A, connecting rod B, connecting rod C, gear, threaded sleeve, bearing C, bearing bracket, guide shaft and reduction motor;

The slip ring is installed in the sleeve, and the lower end surface of the slip ring is in contact with the stepped surface of the sleeve; the lower end of the sleeve rivets the bearing assembly and the bracket; the lower end of the gear disc shaft passes through the gear cover and is installed in the gear seat. And can move up and down; the gear seat is connected to the tooth cover; the upper end of the gear disc shaft passes through the sleeve from bottom to top and is connected to the sleeve; the lower end of the gear seat is connected to the upper end of the connecting rod A; The connecting rod A can drive the gear cover and gear seat to move up and down;

The brake plate and baffle directly pass through the L-shaped groove on the bracket and are axially symmetrical. At the same time, the brake plate can move horizontally in the groove along the wheel diameter direction. An elastic component is provided between the brake plate and the baffle; There are gaps at both ends of the brake plate from the inside of wheel A and wheel B respectively; the wheel rivets connect wheel A, the first bearing, the limit sleeve A, the bracket, the limit sleeve B, the second bearing and the wheel B. riveting in turn;

The toothed disc is mounted on the steps of the box seat and can rotate freely; the torsion spring is embedded between the steps of the toothed disc, and the two supporting surfaces of the torsion spring are respectively stuck on both sides of the steps; the eccentric wheel and the toothed disc The circular steps are assembled concentrically, and the protruding part at the other end is between the two supporting surfaces of the torsion spring; the connecting rod C is connected to the eccentric; the connecting rod A is rotationally connected to the connecting rod B, and the connecting rod B is connected to the connecting rod C. Rotating connection; the connecting rod A passes through the upper end guide rail of the box base, and the pin A is between the through-hole grooves of the guide rail and slides up and down along with the connecting rod A; the reduction motor is directly installed on the box base, and the The gear meshes with the gear plate; the bearing bracket is installed in the box seat; the bearing bracket is equipped with a bearing, one end of the threaded sleeve is an interference fit with the inner ring of the bearing, and the other end is connected to the gear through ribs; the guide shaft and The threaded sleeve is connected; the box base and the box cover are connected; the box assembly is fixed on the bracket;

The control module is electrically connected to the reduction motor and the slip ring respectively, and controls the straight, universal and stationary movement of the wheel by controlling the switch of the reduction motor.

In the above solution, the upper half of the slip ring is the stator end and the lower half is the mover end; the wire harness of the mover end passes through the gear shaft and gear seat and is connected to the reduction motor; the control module and the stator end wire harness are electrically Connection, by controlling the reduction motor switch, to control the straight, universal and stationary movement of the wheel.

In the above solution, the bearing assembly includes bearing A, upper bearing sleeve, lower bearing sleeve and bearing B;

The bearing A and the upper bearing sleeve are connected with an interference fit, and the bearing B and the lower bearing sleeve are connected with an interference fit; the outer ring of the sleeve is respectively connected with the inner ring of the bearing A, the upper bearing sleeve, the lower bearing sleeve, and the bearing B. Interference fit; the upper end of the bearing A is connected to the sleeve step, and the bearing A, the upper bearing sleeve, the lower bearing sleeve, the bearing B, the sleeve and the bracket are connected through the lower end margin of the sleeve.

In the above solution, the riveting margin at the lower end of the sleeve is 2 to 4 mm.

In the above solution, the bearing A is the bearing 51104; the bearing B is the bearing 6903.

In the above solution, a plurality of square tooth slots are evenly distributed on the circumferential surface of the lower end of the gear disc shaft, and the corresponding inner cylindrical surface of the gear seat is provided with square steps corresponding to the size of the tooth slots; the upper end surface of the cylindrical tooth slots of the gear disc shaft A square stepped surface is provided, and the corresponding tooth cover is provided with a through-hole groove of the same size as the square stepped surface.

In the above solution, the guide shaft is an n-shaped guide shaft, and the brake plate has two square grooves on the upper end, and is axially symmetrical; the n-shaped structural ends of the guide shaft can be respectively stuck into the square grooves and drive the brakes. The board moves.

In the above solution, the control module is a single-chip computer or PLC.

In the above solution, there is a gap of 0.3-0.5mm between the two ends of the brake plate and the inside of wheel A and wheel B respectively.

In the above solution, the connecting rod C is connected to the eccentric through a flat key.

Compared with the existing technology, the beneficial effects of the present invention are: for the electric shift caster of the present invention, a 24V or 36V power supply is externally connected to the stepper motor, and the switch of the motor is controlled through a single-chip microcomputer or PLC. Medical staff or patients can use the switch button to arbitrarily switch between the three gears of the hospital bed or wheelchair: straight, universal and static. The invention has compact structure, fast response speed and is very user-friendly, which provides convenience for various medical mobile devices to become intelligent in the future.

Description of drawings

Figure 1 is an exploded perspective view of the device of the present invention;

Figure 2 is an exploded perspective view of the device box assembly of the present invention;

Figure 3 is a schematic diagram of the stationary gear "0" of the device of the present invention;

Figure 4 is a schematic diagram of the straight-running gear "1" of the device of the present invention;

Figure 5 is a schematic diagram of the static gear "2" of the device of the present invention;

In the picture: 1-box assembly, 2-bearing A, 3-upper bearing sleeve, 4-lower bearing sleeve, 5-bearing B, 6-bracket, 7-wheel A, 8-first bearing, 9-limit sleeve Barrel A, 10-limit sleeve B, 11-sleeve, 12-brake plate, 13-compression spring, 14-baffle, 15-wheel rivet, 16-wheel B, 17-tooth cover, 18-tooth plate Shaft, 19-slip ring, 20-pin, 21-gear seat, 1.1-box seat, 1.2-box cover, 1.3-torsion spring, 1.4-gear plate, 1.5-eccentric wheel, 1.6-flat key, 1.7-connecting rod A, 1.8-pin A, 1.9-connecting rod B, 1.10-pin B, 1.11-bearing C, 1.12-connecting rod C, 1.13-reduction motor, 1.14-gear, 1.15-threaded sleeve, 1.16-guide shaft, 1.17 -Bearing bracket.

Detailed ways:

The present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments, but the protection scope of the present invention is not limited thereto.

Figures 1 and 2 are an embodiment of the electric shift caster of the present invention. The electric shift caster includes a slip ring 19, a sleeve 11, a bearing assembly, a bracket 6, a gear shaft 18, and a gear seat 21 , tooth cover 17, wheel A7, wheel B16, brake plate 12, baffle 14, compression spring 13, box assembly 1 and control module. The box component 1 is preferably a plastic box component including a box base 1.1, a box cover 1.2, a torsion spring 1.3, a toothed plate 1.4, a plastic eccentric 1.5, a flat key 1.6, a connecting rod A1.7, a connecting rod B1.9, a connecting rod Rod C1.12, gear 1.14, threaded sleeve 1.15, bearing C1.11, bearing bracket 1.17, guide shaft 1.16 and reduction motor 1.13.

The lower end surface of the slip ring 19 is in contact with the stepped surface of the sleeve 11 and is bonded with special glue; the upper half of the slip ring 19 is the stator end and the lower half is the mover end; the wire harness at the mover end can pass through the toothed disc. The shaft 18 and the gear seat 21 enter the plastic box and are connected to the reduction motor 1.13; the control module is electrically connected to the stator end harness and controls the straight, universal and stationary movement of the wheel by controlling the switch of the reduction motor 1.13 assembly; the The control module is a single-chip computer or PLC; the bearing assembly includes bearing A2, upper bearing sleeve 3, lower bearing sleeve 4 and bearing B 5, wherein bearing A and upper bearing sleeve 3 are connected with an interference fit, and bearing B 5 and lower bearing The sleeve 4 is connected with an interference fit; the outer ring of the sleeve 11 is connected with the inner ring of the bearing A2, the upper bearing sleeve 3, the lower bearing sleeve 4 and the bearing B 5 respectively through an interference fit; the upper end of the bearing A2 and the sleeve 11 The steps are connected, and the bearing A2, the upper bearing sleeve 3, the lower bearing sleeve 4, the bearing B 5, the sleeve 11 and the bracket 6 are connected together through the lower end margin of the sleeve 11; the riveting margin at the lower end of the sleeve 11 is 2 ~4mm; the lower end of the toothed disc shaft 18 is between the gear seat 21 and the tooth cover 17, and can move up and down; the tooth seat 21 and the tooth cover 17 are connected by rivets; the toothed disc shaft 18 rises from the bottom passes through the sleeve 11 and is connected to the sleeve 11 through the positioning pin 20; the lower end of the gear seat 21 has a square groove and is connected to the connecting rod A1.7 through a pin; from then on, the connecting rod A1.7 can The gear cover 17 and the gear seat 21 are driven to move up and down; 16 square tooth grooves are evenly distributed on the circumferential surface of the lower end of the gear wheel shaft 18, and the depth is 2mm. The corresponding inner cylindrical surface of the gear seat 21 is provided with 2 Square steps corresponding to the tooth slot; the upper end surface of the cylindrical tooth slot is provided with a square stepped surface, and the corresponding tooth cover 17 is provided with a through-hole groove of the same size as the stepped surface; the gear disc shaft 18 and the gear seat 21 has through holes with a diameter of 4 mm at its centers.

The brake plate 12 and the baffle 14 directly pass through the L-shaped groove on the bracket 6 and are axially symmetrical. At the same time, the brake plate 12 can move horizontally in the groove along the wheel diameter direction. A compression spring 13 is installed in between; the upper end of the brake plate 12 has two square grooves and is axially symmetrical; the right end of the guide shaft 1.16 can be stuck into the square groove and drive the brake plate 12 to move; the length of the square groove 3-4mm longer than the thickness of the right end of the guide shaft 1.16; the two ends of the brake plate 12 have a gap of 0.3-0.5mm from the inside of wheel A7 and wheel B16 respectively; the wheel rivets connect wheel A7, first bearing 6002, and limit sleeve The cylinder A, the bracket 6, the limiting sleeve B, the second bearing 6002 and the wheel B16 are riveted together in sequence.

The toothed disc 1.4 is mounted on the circular steps of the box base 1.1 and can rotate freely; the torsion spring 1.3 is embedded between the steps of the toothed disc 1.4, and the two supporting surfaces of the torsion spring 1.3 are respectively stuck on the arc-shaped steps. Both sides, and are always in a stressed state; the eccentric 1.5 is concentrically assembled with the circular step of the gear plate 1.4, and the protruding part of the other end is between the two supporting surfaces of the torsion spring 1.3; the connecting rod C1.12 passes through the flat The key 1.6 is connected to the eccentric 1.5; the connecting rod components are connected through two pins; the connecting rod A1.7 and the connecting rod B1.9 are connected through the pin A1.8 and rotate with each other along the pin A1.8, Connecting rod B1.9 and connecting rod C1.12 are connected by pin B1.10 and rotate with each other along pin B1.10.

The connecting rod A1.7 passes through the upper guide rail of the box base 1.1, and the pin A1.8 is between the through-hole grooves of the guide rail and slides up and down along with the connecting rod A1.7; the reduction motor 1.13 is directly mounted on the box base 1.1 , the gear on the reduction motor 1.13 and the tooth plate 1.4 are in perfect mesh; the bearing bracket 1.17 is equipped with a bearing and is fixed on the box seat 1.1 through screws; one end of the threaded sleeve 1.15 has an interference fit with the inner ring of the bearing, and the other end They are connected by ribs and gears; the guide shaft 1.16 and the threaded sleeve 1.15 are connected by threads; the box base 1.1 and the box cover 1.2 are fixed by glue; the box assembly 1 is fixed on the bracket 6 by four screws; The box base 1.1 and the box cover 1.2 are injection molded parts. All the above features including through holes, guide rails and stepped bosses can ensure accurate positioning, installation and precise transmission of each component; the guide rail is provided with a square through hole slot. One side of the guide rail is provided with groove a and groove b distributed up and down; pin B1.10 can be stuck in groove a and groove b.

In this invention, a 24V or 36V power supply is externally connected to the stepper motor, and the switch of the motor is controlled by a single-chip microcomputer or PLC. Finally, the medical staff or the patient can realize the straight, universal and static gears of the hospital bed or wheelchair through the switch button. Switch at will. The invention has compact structure, fast response speed and is very user-friendly, which provides convenience for various medical mobile devices to become intelligent in the future.

Working process of the present invention:

As shown in Figure 3, when the wheel is in the "0" gear position, the square tooth groove on the cylindrical surface of the lower end of the gear wheel shaft 18 can just fit on the two square steps on the inner cylindrical surface of the gear seat 21, and the wheel cannot Rotate; at this time, the pin B1.10 just enters the groove a on the guide rail of the box base 1.1 to realize self-locking; at the same time, the brake plate 12 is stuck in the trapezoidal groove of wheel A7 and wheel B16 under the action of compression spring 13. At this moment , the compression spring 13 is at the minimum compression amount, and the wheel is completely stationary.

When the caster needs to be switched from the "0" gear to the "1" gear, press the switch of the reduction motor 1.13, and the control module controls the reduction motor 1.13 to rotate at a certain angle and then stop. The gear plate 1.4 follows and rotates, and the torsion spring 1.3 is stressed. At this time, The torsion spring 1.3 will inevitably drive the eccentric 1.5 to rotate, and then drive the connecting rod assembly to rotate. The pin B1.10 exits the groove a and releases the self-locking. The connecting rod A1.7 drives the gear seat 21 and the tooth cover 17 to move downward. The gear seat 21 The steps on the inner cylindrical surface are separated from the square tooth grooves on the cylindrical surface of the toothed disc shaft 18, and the wheel realizes rotation; at the same time, the toothed disc 1.4 drives the gear 1.14 to rotate, and then the threaded sleeve 1.15 rotates, and the guide shaft 1.16 realizes linear motion and drives The brake plate 12 is away from the wheel center and disengaged from the trapezoidal groove on the wheel. In this way, the caster is in a universal state, as shown in Figure 4.

When the caster needs to be switched from "1" gear to "2" gear, press the switch of reduction motor 1.13, and the control module controls the reduction motor 1.13 to rotate at a certain angle and then stop. The gear plate 1.4 follows and rotates, and the torsion spring 1.3 is stressed. At this time, The torsion spring 1.3 also drives the eccentric 1.5 to rotate, which in turn drives the connecting rod assembly to rotate. The pin B1.10 enters the groove b, the caster enters the self-locking state again, and the connecting rod A1.7 drives the gear seat 21 and the tooth cover 17 to move further downwards. , the square step on the toothed disc shaft 18 enters the square through-hole groove on the toothed disc 17; at the same time, the toothed disc 1.4 drives the gear 1.14 to rotate, and then the threaded sleeve 1.15 rotates, the guide shaft 1.16 realizes linear motion, and drives the brake plate 12 Continue to move away from the wheel center. At this time, the compression spring 13 is at the maximum compression amount. In this way, the caster is in a straight state, as shown in Figure 5.

During the above-mentioned gear switching process, when the gear wheel shaft 18 cannot immediately get stuck on the step on the inner cylindrical surface of the gear seat 21 or enter the square through-hole groove of the gear cover 17, the torsion spring 1.3 has a buffering function. Protect parts from being squeezed; similarly, when the brake plate 12 cannot enter the trapezoidal groove of the wheel at the first time, the compression spring 13 also has a buffering function to protect the parts from being squeezed. When the caster is in a universal state, the slip ring 19 can well solve the problem of the wire harness of the reduction motor being entangled.

The series of detailed descriptions listed above are only specific descriptions of feasible embodiments of the present invention. They are not intended to limit the protection scope of the present invention. Any equivalent embodiments or embodiments that do not deviate from the technical spirit of the present invention are not intended to limit the protection scope of the present invention. All changes should be included in the protection scope of the present invention.

Claims (8)

1. An electric shift caster, characterized in that it includes a slip ring (19), a sleeve (11), a bearing assembly, a bracket (6), a gear disc shaft (18), a gear seat (21), a gear cover ( 17), wheel A (7), wheel B (16), brake plate (12), baffle (14), elastic parts, box assembly (1) and control module; The box assembly (1) includes a box base (1.1), a box cover (1.2), a torsion spring (1.3), a gear plate (1.4), an eccentric (1.5), a connecting rod A (1.7), a connecting rod B (1.9 ), connecting rod C (1.12), gear (1.14), threaded sleeve (1.15), bearing C (1.11), bearing bracket (1.17), guide shaft (1.16) and reduction motor (1.13); The slip ring (19) is installed in the sleeve (11), and the lower end surface of the slip ring (19) is in contact with the stepped surface of the sleeve (11); the lower end of the sleeve (11) connects the bearing assembly and the bracket (6) riveting; the lower end of the gear wheel shaft (18) passes through the tooth cover (17) and is installed in the tooth seat (21), and can move up and down; the tooth seat (21) and the tooth cover (17) are connected; the tooth The upper end of the disc shaft (18) passes through the sleeve (11) from bottom to top and is connected to the sleeve (11); the lower end of the gear seat (21) is connected to the upper end of the connecting rod A (1.7); the connecting rod Rod A (1.7) can drive the tooth cover (17) and tooth seat (21) to move up and down; The brake plate (12) and baffle (14) directly pass through the L-shaped groove on the bracket (6) and are axially symmetrical. At the same time, the brake plate (12) can move horizontally in the groove along the wheel diameter direction. Elastic components are provided between the brake plate (12) and the baffle (14); gaps are respectively provided at both ends of the brake plate (12) from the inside of wheel A (7) and wheel B (16); wheel rivets secure wheel A (7), the first bearing (8), the limit sleeve A (9), the bracket (6), the limit sleeve B (10), the second bearing and the wheel B (16) are riveted in sequence; The toothed disc (1.4) is mounted on the steps of the box seat (1.1) and can rotate freely; the torsion spring (1.3) is embedded between the steps of the toothed disc (1.4), and the two supports of the torsion spring (1.3) The surfaces are respectively stuck on both sides of the step; the eccentric (1.5) and the gear plate (1.4) are assembled concentrically with the circular step, and the protruding part of the other end is between the two supporting surfaces of the torsion spring (1.3); the connecting rod C (1.12) is connected to the eccentric (1.5); the connecting rod A (1.7) is rotationally connected to the connecting rod B (1.9), and the connecting rod B (1.9) is rotationally connected to the connecting rod C (1.12); the connecting rod A (1.7) passes through the upper guide rail of the box base (1.1), and pin A (1.8) is between the through-hole slots of the guide rail and slides up and down with connecting rod A (1.7); pin B (1.10) can be stuck on the guide rail and arranged up and down. in the groove; the reduction motor (1.13) is directly installed on the box seat (1.1), and the gear on the reduction motor (1.13) meshes with the tooth plate (1.4); the bearing bracket (1.17) is installed on the box seat (1.1) inside; the bearing bracket (1.17) is equipped with a bearing, one end of the threaded sleeve (1.15) is an interference fit with the inner ring of the bearing, and the other end is connected through ribs and gears (1.14); the guide shaft (1.16) and The threaded sleeve (1.15) is connected; the box base (1.1) and the box cover (1.2) are connected; the box assembly (1) is fixed on the bracket (6); The control module is electrically connected to the reduction motor (1.13) and the slip ring (19) respectively, and controls the straight, universal and stationary movement of the wheel by controlling the switch of the reduction motor (1.13); The upper half of the slip ring (19) is the stator end, and the lower half is the mover end; the wire harness at the mover end passes through the gear disc shaft (18) and the gear seat (21), and is connected to the reduction motor (1.13); The control module is electrically connected to the stator end wiring harness, and controls the straight, universal and stationary movement of the wheel by controlling the switch of the reduction motor (1.13); The bearing assembly includes bearing A (2), upper bearing sleeve (3), lower bearing sleeve (4) and bearing B (5); The bearing A (2) and the upper bearing sleeve (3) are connected with an interference fit, and the bearing B (5) and the lower bearing sleeve (4) are connected with an interference fit; the outer ring of the sleeve (11) is connected with the bearing respectively. A (2), the upper bearing sleeve (3), the lower bearing sleeve (4) and the inner ring of the bearing B (5) have an interference fit; the upper end of the bearing A (2) is connected to the sleeve (11) step, and through The lower end margin of the sleeve (11) connects the bearing A (2), the upper bearing sleeve (3), the lower bearing sleeve (4), the bearing B (5), the sleeve (11) and the bracket (6). 2. The electric shift caster according to claim 1, characterized in that the riveting allowance at the lower end of the sleeve (11) is 2 to 4 mm. 3. The electric shift caster according to claim 1, characterized in that the bearing A (2) is a bearing 51104; the bearing B (5) is a bearing 6903. 4. The electric shift caster according to claim 1, characterized in that a plurality of square tooth grooves are evenly distributed on the circumferential surface of the lower end of the gear plate shaft (18), and the corresponding inner cylindrical surface of the gear seat (21) There are square steps corresponding to the size of the tooth slot; the upper end surface of the cylindrical tooth slot of the gear disc shaft (18) is provided with a square stepped surface, and the corresponding tooth cover (17) is provided with a through hole of the same size as the square stepped surface. groove. 5. The electric shift caster according to claim 1, characterized in that the guide shaft (1.16) is an n-type guide shaft, and the brake plate (12) has two square grooves on the upper end and is axially symmetrical. ; The n-shaped structure ends of the guide shaft (1.16) can be respectively stuck into the square grooves and drive the brake plate (12) to move. 6. The electric shift caster according to claim 1, characterized in that the control module is a single chip microcomputer or a PLC. 7. The electric shift caster according to claim 1, characterized in that there is a gap of 0.3-0.5 mm between the two ends of the brake plate (12) and the inner side of wheel A (7) and wheel B (16) respectively. 8. The electric shift caster according to claim 1, characterized in that the connecting rod C (1.12) is connected to the eccentric wheel (1.5) through a flat key (1.6).