CN108121254A - A kind of electronic gearshift castor - Google Patents

Abstract

The invention provides an electric shift caster, which includes a slip ring, a sleeve, a bearing assembly, a bracket, a sprocket shaft, a tooth seat, a tooth cover, a wheel A, a wheel B, a brake plate, a baffle, a compression spring, a box assembly and control module. The box assembly includes box base, box cover, torsion spring, large toothed disc, plastic eccentric wheel, flat key, connecting rod A, connecting rod B, connecting rod C, pinion, threaded sleeve, small bearing, bearing bracket, n Type guide shaft and geared motor. The device of the present invention only needs to provide a 24V or 36V DC power source as a power source, and through controlling the switch button of the deceleration motor, the arbitrary switching of the three gears of the caster wheel, which is static, universal and straight, is realized. The invention has the advantages of compact structure, fast response speed and humanization, which provides convenience for various medical mobile devices to be intelligentized in the future.

Description

An electric shift caster

technical field

The invention belongs to the field of medical machinery research, in particular to a bevel gear type electric shift caster.

technical background

According to statistics, there are about 150,000 kinds of casters with different characteristics in all walks of life in the world, which are widely used, which prompts people to continuously invent casters to meet different requirements in different fields. Nowadays, with the advancement of science and technology, people are eager for intelligent operation of mobile devices, especially in the field of medical devices.

At present, the central control caster in Taiwan, China, whose authorization announcement number is CN202656787U, has a complex control system structure, high cost, and many parts; in order to facilitate medical staff, even patients can independently operate hospital beds, wheelchairs, ambulances, etc. Equipment, it is necessary that the casters equipped on these equipment can realize 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, which can be controlled by medical staff or patients through buttons or even intelligent voice, so as to realize the mobile equipment equipped with the caster. There are three functions of static, 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 sprocket shaft, a tooth seat, a tooth cover, a wheel A, a wheel B, a brake plate, a baffle plate, and an elastic component , box assembly and control module;

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

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

The brake plate and the baffle directly pass through the L-shaped groove on the bracket and are axially symmetrical, and the brake plate can move horizontally in the groove along the wheel diameter direction, and an elastic member is arranged between the brake plate and the baffle; The two ends of the brake plate are respectively provided with gaps from the inner side of the wheel A and the wheel B; the wheel rivet connects the wheel A, the first bearing, the limit sleeve A, the bracket, the limit sleeve B, the second bearing and the wheel B sequential riveting;

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

The control module is electrically connected to the decelerating motor and the slip ring respectively, and controls the straight running, universal direction and stationary of the wheels by controlling the decelerating motor switch.

In the above solution, the upper part of the slip ring is the stator end, and the lower part is the mover end; the wire harness at the mover end passes through the sprocket shaft and the tooth seat, and is connected to the geared motor; the control module and the stator end wire harness are electrically Connection, by controlling the geared motor switch, to control the straight running, universal and stationary of the wheels.

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

The bearing A is connected with the upper bearing sleeve with an interference fit, and the bearing B is connected with the lower bearing sleeve 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 allowance at the lower end of the sleeve.

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

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

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

In the above scheme, the guide shaft is an n-type guide shaft, and two square grooves are opened on the upper end of the brake plate, which are axisymmetric; the ends of the n-type structure of the guide shaft can be respectively snapped into the square grooves and drive the brake The board moves.

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

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

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

Compared with the prior art, the beneficial effect of the present invention is: a kind of electric shift caster described in the present 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, and finally The medical staff or patients can switch between the straight, universal and stationary gears of the hospital bed or wheelchair through the switch button. The invention has the advantages of compact structure, fast response speed and humanization, which provides convenience for various medical mobile devices to be intelligentized in the future.

Description of drawings

Fig. 1 is the exploded three-dimensional schematic diagram of device of the present invention;

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

Fig. 3 is a schematic diagram of the static gear position "0" of the device of the present invention;

Fig. 4 is a schematic diagram of the straight gear "1" of the device of the present invention;

Fig. 5 is a schematic diagram of the static gear position "2" of the device of the present invention;

In the figure: 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-limiting sleeve Barrel A, 10-limiting sleeve B, 11-sleeve, 12-brake plate, 13-compression spring, 14-baffle plate, 15-wheel rivet, 16-wheel B, 17-tooth cover, 18-tooth plate Shaft, 19-slip ring, 20-pin, 21-tooth seat, 1.1-box seat, 1.2-box cover, 1.3-torsion spring, 1.4-chainring, 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 described in further detail below in conjunction with the accompanying drawings and specific embodiments, but the protection scope of the present invention is not limited thereto.

Figure 1 and Figure 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 toothed disc shaft 18, and a tooth seat 21 , tooth cover 17, wheel A7, wheel B16, brake plate 12, baffle plate 14, compression spring 13, box assembly 1 and control module. Among them, the box assembly 1 is preferably a plastic box assembly including box base 1.1, box cover 1.2, torsion spring 1.3, gear plate, 1.4, plastic eccentric wheel 1.5, flat key 1.6, connecting rod A1.7, connecting rod B1.9, 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 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 sprocket Shaft 18 and gear seat 21, and enter the plastic box to connect with geared motor 1.13; the control module is electrically connected with the stator end harness, and controls the straight running, universal and stationary of the wheel by controlling the switch of the geared motor 1.13 assembly; The control module is a single-chip microcomputer or PLC; the bearing assembly includes a bearing A 2, an upper bearing sleeve 3, a lower bearing sleeve 4 and a bearing B 5, wherein the bearing A and the upper bearing sleeve 3 are connected by interference fit, and the bearing B 5 and the lower bearing B 5 The bearing sleeve 4 is connected by interference fit; the outer ring of the sleeve 11 is respectively connected with the inner ring of the bearing A 2, the upper bearing sleeve 3, the lower bearing sleeve 4 and the bearing B 5 through an interference fit; the upper end of the bearing A 2 and The sleeve 11 is connected by steps, and 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 are connected together through the margin at the lower end of the sleeve 11; the lower end of the sleeve 11 is riveted The margin is 2 to 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 passes through the sleeve 11 from bottom to top, and is connected with the sleeve 11 through the positioning pin 20; the lower end of the tooth seat 21 has a square groove, and is connected with the connecting rod A1.7 through the pin; from then on, the connecting rod A1.7 can drive the tooth cover 17 and the tooth seat 21 to move up and down; 16 square tooth grooves are evenly distributed on the circumferential surface of the lower end of the tooth disc shaft 18, the depth of which is 2mm, and the corresponding inner cylindrical surface of the tooth seat 21 There are two square steps corresponding to the size of the tooth groove; a square step surface is provided on the upper end surface of the cylindrical tooth groove, and a through-hole groove of the same size as the step surface is provided on the corresponding tooth cover 17; the tooth disc shaft 18 and tooth holder 21 have the through hole that diameter is 4mm respectively at its center.

The brake plate 12 and the baffle plate 14 directly pass through the L-shaped groove on the bracket 6 and are axially symmetrical, and the brake plate 12 can move horizontally in the groove along the wheel diameter direction, and the brake plate 12 and the baffle plate 14 A compression spring 13 is installed in between; the upper end of the brake plate 12 is provided with two square grooves, which are axisymmetric; the right end of the guide shaft 1.16 can be inserted 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 inner side of the wheel A7 and the wheel B16 respectively; the wheel A7, the first bearing 6002, the limit sleeve The tube A, the bracket 6, the limit sleeve B, the second bearing 6002 and the wheel B16 are riveted together sequentially.

The toothed plate 1.4 is installed on the circular step of the box base 1.1 and can rotate freely; the torsion spring 1.3 is embedded between the steps of the toothed plate 1.4, and the two supporting surfaces of the torsion spring 1.3 are respectively stuck on the arc-shaped steps on both sides, and always in a stressed state; the eccentric wheel 1.5 is assembled concentrically 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 with the eccentric wheel 1.5; the connecting rod assembly is connected by two pins; the connecting rod A1.7 and the connecting rod B1.9 are connected by the pin A1.8 and rotate along the pin A1.8, The connecting rod B1.9 and the connecting rod C1.12 are connected by the pin B1.10 and mutually rotate along the 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 slides up and down along with the connecting rod A1.7 between the through holes of the guide rail; the geared motor 1.13 is directly mounted on the box base 1.1 , the gears on the reduction motor 1.13 and the gear plate 1.4 are in good mesh; the bearing bracket 1.17 is equipped with a bearing, and is fixed on the box seat 1.1 by screws; one end of the threaded sleeve 1.15 is in interference fit with the inner ring of the bearing, and the other end Connected by ribs and gears; the guide shaft 1.16 and the threaded sleeve 1.15 are threaded; the box seat 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, and all the above features, including through holes, guide rails and stepped bosses, can ensure accurate positioning and installation of various parts, and precise transmission; the guide rail is provided with a square through hole slot, One side of the guide rail is provided with a groove a and a groove b distributed up and down; the pin B1.10 can be stuck in the groove a and the groove b.

In the present invention, a 24V or 36V power supply is externally connected to the stepping motor, and the switch of the motor is controlled by a single-chip microcomputer or PLC. Finally, the medical staff or patients can realize the three gears of straight travel, universal and static of the hospital bed or wheelchair through the switch button. Switch at will. The invention has the advantages of compact structure, fast response speed and humanization, which provides convenience for various medical mobile devices to be intelligentized 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 toothed disc shaft 18 can just fit on the two square steps on the inner cylindrical surface of the gear seat 21, and the wheel cannot Turn; at this time, the pin B1.10 just enters the groove a on the guide rail of the box seat 1.1 to realize self-locking; at the same time, the brake plate 12 is stuck in the trapezoidal groove of the wheel A7 and the wheel B16 under the action of the compression spring 13, at this moment , the compression spring 13 is in the minimum amount of compression, and the wheel is completely stationary.

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

When the casters need to be switched from "1" gear to "2" gear, press the geared motor 1.13 switch, the control module controls the geared motor 1.13 to rotate at a certain angle and stop, the gear plate 1.4 rotates accordingly, and the torsion spring 1.3 is stressed. At this time, The torsion spring 1.3 also drives the eccentric wheel 1.5 to rotate, and then 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 holder 21 and the gear cover 17 to move further downward , the square ladder on the tooth disc shaft 18 enters the square through-hole groove on the tooth disc 17; at the same time, the tooth 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 away from the wheel center, now the compression spring 13 is in the maximum compression. In this way, the casters are in the straight-ahead state, as shown in Figure 5.

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

The series of detailed descriptions listed above are only specific descriptions for feasible embodiments of the present invention, and they are not intended to limit the protection scope of the present invention. Any equivalent embodiment or All changes should be included within the protection scope of the present invention.

Claims (10)

1. a kind of electronic gearshift castor, which is characterized in that including slip ring (19), sleeve (11), bearing assembly, stent (6), fluted disc Axis (18), toothholder (21), tooth lid (17), wheel A (7), wheel B (16), braking vane (12), baffle (14), elastomeric element, box group Part (1) and control module；

The case assembly (1) includes cassette holder (1.1), box cover (1.2), torsional spring (1.3), fluted disc (1.4), eccentric wheel (1.5), connecting rod A (1.7), connecting rod B (1.9), connecting rod C (1.12), gear (1.14), screw shell (1.15), bearing C (1.11), the support of bearing (1.17), guiding axis (1.16) and decelerating motor (1.13)；

The slip ring (19) is mounted in sleeve (11), and slip ring (19) lower face is contacted with sleeve (11) cascaded surface；The sleeve (11) lower end rivets bearing assembly and stent (6)；Fluted disc axis (18) lower end is mounted on toothholder through tooth lid (17) (21) in, and can move up and down；The toothholder (21) and tooth lid (17) connection；The upper end of the fluted disc axis (18) is from bottom to top It is connected through sleeve (11), and with sleeve (11)；Toothholder (21) lower end is connected with the upper end of connecting rod A (1.7)；The connecting rod A (1.7) can be moved up and down with moving teeth lid (17) and toothholder (21)；

The braking vane (12) and baffle (14) directly through the L-type slot on stent (6) and axisymmetricly, while braking vane (12) it can be moved horizontally inside slot along wheel footpath direction, elastomeric element is equipped between the braking vane (12) and baffle (14)； Braking vane (12) both ends are respectively equipped with gap on the inside of wheel A (7) and wheel B (16)；The rivet of taking turns is by wheel A (7), clutch shaft bearing (8), spacing collar A (9), stent (6), spacing collar B (10), second bearing and wheel B (16) riveting successively It connects；

The fluted disc (1.4) is mounted on the step of cassette holder (1.1), and free to rotate；The torsional spring (1.3) is embedded in fluted disc (1.4) between step, two supporting surfaces of torsional spring (1.3) are stuck in step both sides；The eccentric wheel (1.5) and fluted disc (1.4) step cutting pattern concentric fits, other end protrusion is between (1.3) two supporting surfaces of torsional spring；The connecting rod C (1.12) connected with eccentric wheel (1.5)；The connecting rod A (1.7) is rotatablely connected with connecting rod B (1.9), connecting rod B (1.9) and connecting rod C (1.12) it is rotatablely connected；The connecting rod A (1.7) passes through cassette holder (1.1) upper end guide rail, and pin A (1.8) is between the logical of guide rail As connecting rod A (1.7) is slided up and down between hole slot；Pin B (1.10) may be stuck in the groove that guide rail is arranged up and down；The deceleration Motor (1.13) is directly installed on cassette holder (1.1), gear and fluted disc (1.4) engagement on decelerating motor (1.13)；The support of bearing (1.17) it is mounted in cassette holder (1.1)；Equipped with bearing on the support of bearing (1.17), described screw shell (1.15) one end and Bearing inner race is interference fitted, and the other end is connected by rib and gear (1.14)；The guiding axis (1.16) and screw shell (1.15) connect；The cassette holder (1.1) and box cover (1.2) connection；The case assembly (1) is fixed on stent (6)；

Control module difference decelerating motor (1.13) with and slip ring (19) be electrically connected, by the way that decelerating motor (1.13) is controlled to open It closes, to control the keeping straight on of wheel, universal and static.

2. electronic gearshift caster device according to claim 1, which is characterized in that slip ring (19) top half is fixed Sub- end, the latter half are mover ends；The harness at mover end passes through fluted disc axis (18) and toothholder (21), with decelerating motor (1.13) even It connects；The control module and the electrical connection of stator terminal harness, by the way that decelerating motor (1.13) is controlled to switch, to control the straight of wheel It is capable, universal and static.

3. electronic gearshift caster device according to claim 1, which is characterized in that the bearing assembly includes bearing A (2), upper bearing sleeve (3), lower bearing sleeve (4) and bearing B (5)；

The bearing A (2) and upper bearing sleeve (3) interference fit connection, the bearing B (5) and lower bearing sleeve (4) interference fit connect It connects；Sleeve (11) outer ring inner ring interference with bearing A (2), upper bearing sleeve (3), lower bearing sleeve (4) and bearing B (5) respectively Cooperation；Bearing A (2) upper ends are connected with sleeve (11) step, and by sleeve (11) lower end surplus by bearing A (2), upper axis Bearing sleeve (3), lower bearing sleeve (4), bearing B (5), sleeve (11) and stent (6) connection.

4. the electronic gearshift caster device according to claim 1 or 3, which is characterized in that sleeve (11) the lower end riveting Surplus is 2~4mm.

5. electronic gearshift caster device according to claim 3, which is characterized in that the bearing A (2) is bearing 51104； The bearing B (5) is bearing 6903.

6. electronic gearshift caster device according to claim 1, which is characterized in that fluted disc axis (18) the lower circumferential face On be uniformly distributed multiple square tooth sockets, corresponding toothholder (21) inner cylinder face is equipped with the square platform of size corresponding with tooth socket Rank；Fluted disc axis (18) cylinder tooth socket upper surface is equipped with square cascaded surface, and corresponding tooth lid (17) is equipped with and square ladder An equal amount of through-hole groove in face.

7. electronic gearshift caster device according to claim 1, which is characterized in that the guiding axis (1.16) is led for n-type To axis, braking vane (12) upper end is opened there are two square groove, and axisymmetricly；The n-type structure of the guiding axis (1.16) End can stick into square groove and brake (12) plate is driven to move respectively.

8. electronic gearshift caster device according to claim 1, which is characterized in that the control module for microcontroller or PLC。

9. electronic gearshift caster device according to claim 1, which is characterized in that braking vane (12) the both ends distance wheel There are the gap of 0.3-0.5mm in sub- A (7) and wheel B (16) insides respectively.

10. electronic gearshift caster device according to claim 1, which is characterized in that the connecting rod C (1.12) passes through flat key (1.6) connected with eccentric wheel (1.5).