Stress induction early warning structure of actuating device

Abstract

The utility model relates to a stress induction early warning structure of an actuating device, the actuating device comprises a transmission mechanism and a rear support, the transmission mechanism comprises a driving screw, a bearing and a clutch mounting seat, the stress induction early warning structure comprises a force sensor, and the force sensor is arranged on one side, back to the clutch mounting seat, of the bearing and is covered by the rear support. Therefore, product damage and human body injury can be effectively prevented, and whether a patient is in a bed state or an off-bed state can be known at any time.

Description

Technical Field

[0001] The present application relates to the technical field of an actuating device, and in particular to a force sensing warning structure of an actuating device. Background Art

[0002] Actuators are used in electric beds, nursing beds, hospital beds, electric lift tables or chairs and other equipment to adjust the height or elevation angle, which is quite common. When the user encounters an obstacle during the adjustment of the aforementioned equipment, the user will contact the obstacle and generate an interaction force, which will be transmitted to the actuator. If the actuator does not stop operating immediately, the actuator will be damaged by the obstacle; if the obstacle is a human body, it will cause harm to the human body.

[0003] In addition, most of the existing actuators do not have a dynamic detection function. When they are used on a medical bed frame, medical personnel or the patient's family members cannot actually know whether the patient is in bed or out of bed through a terminal device or equipment.

[0004] Therefore, how to solve the aforementioned problems such as product damage, human injury, and whether the patient is in bed or out of bed is a technical issue that the applicant needs to solve. Utility Model Content

[0005] The purpose of the present application is to provide a force sensing warning structure of an actuator, which can effectively prevent product damage and human injury, and can know at any time whether the patient is in bed or out of bed.

[0006] In order to achieve the above-mentioned objectives, the present application provides a force sensing warning structure of an actuating device, the actuating device including a transmission mechanism and a rear support, the transmission mechanism including a lead screw, a bearing and a clutch mounting seat, the force sensing warning structure including a force sensor, which is arranged on the side of the bearing facing away from the clutch mounting seat and is covered by the rear support.

[0007] In one embodiment, the force sensor is directly bonded to the end face of the bearing.

[0008] In one embodiment, the invention further comprises a cover member fixed on a side of the bearing facing away from the clutch mounting seat.

[0009] In one embodiment, the cover component includes a cover plate and an annular ring extending from the cover plate, and the cover plate is fixed to the end surface of the bearing.

[0010] In one embodiment, it further comprises an annular spring sheet, which is fixed on the side of the annular ring facing away from the cover plate, and the force sensor is adhered to the end surface of the annular spring sheet.

[0011] In one embodiment, the cover member further includes a conical ring formed between the cover plate and the annular ring.

[0012] In one embodiment, the force sensor is a resistance strain gauge.

[0013] The present application also has the following effects. By setting the force sensor, when the load changes during the extension or retraction of the telescopic tube, the internal annular spring sheet will produce a slight deformation. After the force sensor detects the deformation of the annular spring sheet, it will generate a resistance value and transmit it to the control box or control terminal. Medical personnel can use this to detect whether the patient is in bed or out of bed. In addition, the resistance value generated can also be used as an anti-collision warning. When the telescopic tube is in the process of extension and retraction, if it encounters an obstacle that causes the telescopic tube to be unable to extend or retract smoothly, or the telescopic tube is hit, the force on the lead screw will change, and then the annular spring sheet will be deformed. The force sensor detects the deformation of the annular spring sheet and transmits the detection result to the control box to improve the safety of use. The present application has a simple structure, easy assembly, and the material cost is also quite low. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 This is an exploded view of the force sensing warning structure of the actuator device of this application.

[0015] Figure 2 This is an exploded view of the force sensor, bearing and rear support of this application.

[0016] Figure 3 for Figure 2 Combined section view.

[0017] Figure 4 This is an exploded view of another embodiment of the present application.

[0018] Figure 5 This is an exploded view of the force sensor, bearing, and rear support according to another embodiment of the present application.

[0019] Figure 6 for Figure 5 Combined section view.

[0020] Description of reference numerals:

[0021] 1. 1A: force sensing warning structure;

[0022] 10: force sensor;

[0023] 20: cover member;

[0024] 21: cover plate;

[0025] 22: annular ring;

[0026] 23: cone ring;

[0027] 30: annular shrapnel;

[0028] 8: Actuating device;

[0029] 81: driving mechanism;

[0030] 811: electric motor;

[0031] 8111: worm;

[0032] 812: lower bearing seat;

[0033] 813: upper cover body;

[0034] 82: transmission mechanism;

[0035] 821: lead screw;

[0036] 822: bearing;

[0037] 823: Clutch mounting seat;

[0038] 824: telescopic tube;

[0039] 8241: Nut;

[0040] 825: worm gear;

[0041] 826: Clutch;

[0042] 827: screw-fixed assembly;

[0043] 83: rear support;

[0044] 84: External control. DETAILED DESCRIPTION

[0045] The detailed description and technical contents of the present application are described as follows in conjunction with the accompanying drawings. However, the attached drawings are only provided for reference and explanation and are not intended to limit the present application.

[0046] See also Figures 1 to 3 As shown, the present invention provides a force sensing warning structure of an actuator device, wherein the actuator device 8 mainly includes a driving mechanism 81, a transmission mechanism 82, a rear support 83 and an outer tube 84, wherein the driving mechanism 81 mainly includes a motor 811, a lower bearing seat 812, an upper cover 813 and other related components or devices, the motor 811 is accommodated in the lower bearing seat 812, and the upper cover 813 corresponds to the lower bearing seat 812 as a cover, wherein the motor 811 has a worm 8111.

[0047] The transmission mechanism 82 mainly includes a lead screw 821, a bearing 822, a clutch mounting seat 823, a telescopic tube 824, a worm gear 825, a clutch 826, a screw-fixing assembly 827 and other related components or devices, wherein the clutch 826 and the worm gear 825 are sequentially sleeved on the clutch mounting seat 823, and then the clutch mounting seat 823 and the bearing 822 are sequentially sleeved on the end of the lead screw 821, and the lead screw 821 is pressed through the screw-fixing assembly 827, so that the bearing 822 is clamped between the clutch mounting seat 823 and the screw-fixing assembly 827; then, the rear support 83 is sleeved to cover the outer periphery of the bearing 822, and then the lead screw 821 and the bearing 822 are jointly supported between the aforementioned lower bearing seat 812 and the upper cover body 813.

[0048] The worm wheel 825 is meshed with the worm 8111, and the motor 811 drives the lead screw 821 to rotate clockwise or counterclockwise. The telescopic tube 824 has a nut 8241, which is threadedly connected with the lead screw 821 for transmission. The outer tube 84 is sleeved on the outer periphery of the telescopic tube 824 and one end of which is fixed between the lower bearing seat 812 and the upper cover 813.

[0049] The novel force sensing warning structure 1 mainly includes a force sensor 10, which is arranged on the side of the aforementioned bearing 822 facing away from the aforementioned clutch mounting seat 823 and is covered by the aforementioned rear support 83. The force sensor 10 is electrically connected to a control device (not shown in the figure), and the control device is used to cut off the power, make the motor 811 rotate in the opposite direction, and detect the dynamic state of the bed frame; in addition, the force change can also be detected when the telescopic tube 824 is in a stationary state.

[0050] The force sensor 10 (or force sensor) is a sensing component that can convert the strain change on the mechanical structure into a resistance change. It can be a wire resistance strain gauge or a foil resistance strain gauge. It mainly includes a sensitive grid, a substrate, a lead and a cover. The sensitive grid is formed by bending a thin wire with a diameter of 0.01 to 0.05 mm and a high resistivity into a grid shape. It is actually a resistance component and a sensitive part of the resistance strain gauge that senses the strain of the component. The sensitive grid is fixed to the substrate with an adhesive. The function of the substrate should ensure that the strain on the component is accurately transferred to the sensitive grid. Therefore, it must be made very thin, generally 0.03 to 0.06 mm, so that it can be firmly bonded to the specimen and the sensitive grid. In addition, it should also have good insulation, moisture resistance and heat resistance. The material of the substrate can be paper, film, glass fiber cloth, etc. Paper has the advantages of being soft, easy to stick, large strain limit and low price, but poor temperature and humidity resistance, and is generally used when the working temperature is below 70°C. In order to improve moisture resistance, durability and operating temperature, it can be impregnated with phenolic resin adhesives. The operating temperature can be increased to 180°C, and the time stability is good, which is suitable for force measurement and other sensors. The film substrate is a film made of organic adhesives such as epoxy resin, phenolic resin, polyester resin and polyimide. The film substrate has better flexibility, moisture resistance and durability than paper, and the operating temperature can reach 100-300°C. Glass fiber cloth can withstand high temperatures of 400-450°C and is mostly used as a medium or high temperature strain gauge substrate. The function of the lead is to connect the sensitive grid resistor component to the measurement circuit. It is generally made of 0.1-0.2mm low-resistance tinned copper wire and welded to the two output ends of the sensitive grid.

[0051] When in use, when the telescopic tube 824 encounters an obstacle during extension or retraction, or when the weight changes during retraction, the force transmission is as follows: when the telescopic tube 824 is loaded, the force is transmitted from the telescopic tube 824 to the nut 8241. Since the nut 8241 is threadedly engaged with the lead screw 821, the force is then transmitted to the lead screw 821. The tail end of the lead screw 821 is equipped with a clutch mounting seat 823 and a bearing 822, so the force on the lead screw 821 will be transmitted to the clutch mounting seat 823, and then transmitted to the bearing 822 by the clutch mounting seat 823. At this time, the force sensor 10 is attached to the end surface of the bearing 822, so that the force change of the bearing 822 can be detected, and the corresponding resistance value is generated and transmitted to the control box or control terminal (not shown) through the signal output line. The control box or control terminal can use this as a signal to achieve various purposes.

[0052] Specifically, as the force on bearing 822 changes, the sensitive grid of force sensor 10 will also undergo the same change, causing its resistance value to change accordingly. This change in resistance value is proportional to the strain of bearing 822. Therefore, if this resistance value change is converted into a voltage or current change through a certain measurement circuit, and then recorded using a display recording instrument, the size of the strain of bearing 822 can be known.

[0053] See also Figures 4 to 6 As shown, the force sensing warning structure 1A of this embodiment mainly includes a force sensor 10, a cover member 20 and an annular spring piece 30. The cover member 20 is fixed on the side of the aforementioned bearing 822 facing away from the clutch mounting seat 823. The cover member 20 mainly includes a cover plate 21 and an annular ring 22 extending from the cover plate 21. The cover plate 21 is fixed to the end surface of the aforementioned bearing 822. In one embodiment, the cover member 20 also includes a conical ring 23, which is formed between the cover plate 21 and the annular ring 22. The annular spring piece 30 is fixed on the side of the annular ring 22 facing away from the cover plate 21, and the force sensor 10 is adhered to the end surface of the annular spring piece 30.

[0054] During use, when the telescopic tube 824 is loaded, the force is transmitted from the telescopic tube 824 to the nut 8241. The nut 8241 and the lead screw 821 are threadedly engaged, so the force is then transmitted to the lead screw 821. Since the tail end of the lead screw 821 is equipped with a clutch mounting seat 823, a bearing 822, a cover component 20 and a disc-shaped spring piece 30, the force on the lead screw 821 will be transmitted to the clutch mounting seat 823, and then transmitted to the bearing 822, and then transmitted to the cover component 20 by the bearing 822, and finally transmitted to the disc-shaped spring piece 30 by the cover component 20.

[0055] Specifically, the force sensor 10 is bonded to the disc-shaped spring piece 30 through an adhesive. When the disc-shaped spring piece 30 is subjected to a certain amount of load, it will deform. After the force sensor 10 detects the deformation of the disc-shaped spring piece 30, it will generate a corresponding resistance value, which is finally transmitted to the control box or control terminal through the signal output line.

[0056] The above description is only a preferred embodiment of the present application and is not intended to limit the patent scope of the present application. Other equivalent changes that apply the patent spirit of the present application should all fall within the patent scope of the present application.

Claims

1. A force sensing warning structure of an actuating device, characterized in that: The actuating device includes a transmission mechanism and a rear support, the transmission mechanism includes a lead screw, a bearing and a clutch mounting seat, and the force sensing warning structure includes a force sensor, which is arranged on a side of the bearing facing away from the clutch mounting seat and is covered by the rear support.

2. The force sensing warning structure of the actuator according to claim 1, characterized in that: The force sensor is directly adhered to the end surface of the bearing.

3. The force sensing warning structure of the actuator according to claim 1, characterized in that: It also includes a cover component, which is fixed on a side of the bearing facing away from the clutch mounting seat.

4. The force sensing warning structure of the actuator according to claim 3, characterized in that: The cover component comprises a cover plate and an annular ring extending from the cover plate, and the cover plate is fixed on the end surface of the bearing.

5. The force sensing warning structure of the actuator according to claim 4, characterized in that: It also includes an annular spring sheet, which is fixed on the side of the annular ring facing away from the cover plate, and the force sensor is adhered to the end surface of the annular spring sheet.

6. The force sensing warning structure of the actuator device according to claim 5, characterized in that: The cover member further includes a conical ring formed between the cover plate and the annular ring.

7. The force sensing warning structure of the actuator according to claim 1, characterized in that: The force sensor is a resistance strain gauge.

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