Telescopic device

Abstract

The utility model relates to a telescopic device which comprises a screw rod, a sleeve, a motor and a connecting seat, the screw rod extends into the sleeve; the sleeve sequentially comprises a first section, a second section and a third section; a flat position is arranged on the second section, and a limiting ring is arranged on the third section; the motor is arranged on the connecting seat and is connected with a driving gear; the connecting seat is connected with the sleeve and is in contact with the flat position; the third section is provided with a driven gear, and the driven gear is meshed with the driving gear; a driven nut is arranged on the screw rod; the driving gear is coaxially connected with the driven nut; and the limiting ring is arranged between the driven gear and the driven nut. The motor transmits torque to the screw rod through meshing of the driving gear and the driven gear, the driven gear is directly arranged on the sleeve and is not directly connected with the screw rod, vibration generated when the screw rod rotates and moves is prevented from being transmitted to the motor, and vibration borne by the motor is reduced.

Description

TECHNICAL FIELD

[0001] The utility model relates to retractable structure technical field especially relates to retractable device. BACKGROUND

[0002] The retractable device can flexibly adjust its length according to the requirement, and is widely used in mechanical equipment, such as retractable container, Taylor frame etc.

[0003] The retractable device includes transmission manual operation manual retractable device and electric retractable device, wherein the manual retractable device needs manual operation, and it is troublesome to adjust, especially when the retractable device is long and needs frequent adjustment, the working efficiency of mechanical equipment is affected. Although the electric is convenient and saves manpower, the vibration during the retracting process of the electric retractable device is large, and the motor is prone to looseness, which leads to use interruption.

[0004] It should be noted that the information disclosed in the above background section is only used to strengthen the understanding of the background of the present disclosure, and therefore can include information that does not constitute prior art known to those of ordinary skill in the art. UTILITY MODEL CONTENT

[0005] In view of the above shortcomings of the prior art, the purpose of the utility model is to provide a retractable device to improve the stability of the retractable device.

[0006] The technical scheme of the utility model is as follows:

[0007] A retractable device, the retractable device includes screw rod, sleeve, motor and connecting seat;

[0008] The screw rod extends into the sleeve;

[0009] The sleeve includes first section, second section and third section in sequence;The second section is provided with flat position, and the third section is provided with limiting ring;

[0010] The motor is arranged on the connecting seat, and the motor is connected with driving gear;

[0011] The connecting seat is connected with the sleeve, and the connecting seat contacts the flat position;

[0012] Among them, the third section is provided with driven gear, and the driven gear is engaged with the driving gear;The screw rod is provided with driven nut;The driven gear is coaxially connected with the driven nut;The limiting ring is arranged between the driven gear and the driven nut.

[0013] Its further technical features are that it also includes a shell; the shell covers the motor and the connecting seat; the sleeve and the screw pass through the shell; two pins are extended from the connecting seat; the two pins are arranged on both sides of the sleeve, and threaded holes are provided at the ends of the two pins away from the connecting seat; and threaded fasteners pass through the shell and are screwed into the threaded holes.

[0014] Its further technical feature is that a limiting groove is provided on the second section, and the latch passes over the second section along the limiting groove.

[0015] Its further technical features are: a target object is set on the driven gear; a sensor is set on the connecting seat to detect the target object; when the sleeve is set vertically, the sensor is set directly above the driven gear along the axial direction of the sleeve.

[0016] Its further technical feature is that a stepped groove is provided at the threaded mouth of the driven nut, and the limiting ring is arranged in the stepped groove.

[0017] Its further technical feature is that the step between the first section and the second section forms a first step; and the connecting seat contacts the first step.

[0018] Its further technical feature is that the difference between the second section and the third section forms a second step.

[0019] Its further technical feature is that the motor is connected to a reducer; and the driving gear is arranged on the output shaft of the reducer.

[0020] The beneficial technical effects of the utility model are as follows:

[0021] (1) The telescopic device in the present invention is provided with a flat portion on the second section, and the connecting seat contacts the sleeve through the flat portion. The flat shape of the flat portion can more evenly transfer the stress between the sleeve and the connecting seat, reducing stress concentration. At the same time, the flat connection surface can reduce the instability of the connection caused by tilting or rotation. The connection stability between the connecting seat and the sleeve is enhanced, thereby increasing the stability of the motor installation. At the same time, the motor transmits torque to the screw through the meshing of the driving gear and the driven gear, and the driven gear is directly provided on the sleeve and is not directly connected to the screw, thereby avoiding the transmission of vibration of the screw during rotation and movement to the motor, reducing the vibration of the motor, and extending the service life of the motor.

[0022] (2) Furthermore, the connecting seat holds the sleeve via the latch and the housing, thereby fixing the connecting seat to the sleeve. The latch is connected to the housing, and the fixing of the connecting seat directly utilizes the existing structure, thus streamlining the structure of the telescopic device. At the same time, a limiting groove is provided on the sleeve to define the position of the latch, further increasing the connection strength between the sleeve and the connecting seat and improving the stability of the telescopic device.

[0023] (3)Further, the connecting seat is further provided with a sensor for detecting a target on the driven gear. The driven gear rotates synchronously with the screw rod, and the rotation number of the screw rod can be accurately detected through cooperation of the sensor and the target. Meanwhile, the detection process is not affected by the state of the driving gear, and the assembly error between the driving gear and the output shaft and the assembly error between the driving gear and the driven gear do not affect the detection accuracy. BRIEF DESCRIPTION OF DRAWINGS

[0024] Figure 1 Fig. 1 shows a perspective structural schematic view of the telescopic device after the outer shell is removed in the embodiment one of the utility model.

[0025] Figure 2 Fig. 1 shows a perspective structural schematic view of the telescopic device after the outer shell is removed in the embodiment one of the utility model.

[0026] Figure 3 Fig. 1 shows a perspective structural schematic view of the telescopic device after the outer shell is removed in the embodiment one of the utility model.

[0027] Figure 4 Fig. 1 shows a perspective structural schematic view of the telescopic device after the outer shell is removed in the embodiment one of the utility model.

[0028] Markings in the drawings:

[0029] 1, sleeve; 11, first section; 12, second section; 121, flat position; 122, limiting groove; 13, third section; 131, second step; 132, limiting ring; 14, first step; 2, screw rod; 31, motor; 32, speed reducer; 41, driving gear; 42, driven gear; 43, driven nut; 44, stepped groove; 5, connecting seat; 51, bolt; 52, threaded hole; 6, outer shell; 7, threaded fastener. DETAILED DESCRIPTION

[0030] In order to make the purpose, features and advantages of the utility model more obvious and easy to understand, please refer to the drawings. It should be known that the structure, proportion, size and the like shown in the drawings attached to the specification are only used to cooperate with the content disclosed in the specification, so as to be understood and read by those skilled in the art, and are not used to limit the limiting conditions of the implementation of the utility model, so they do not have the technical essence, any modification of structure, change of proportion relationship or adjustment of size, as long as it does not affect the effect and purpose that can be produced by the utility model, it should still fall within the scope covered by the technical content disclosed by the utility model.

[0031] In the description of the utility model, the orientation or positional relationship indicated by the limited terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer", "axial", "radial", "circumferential" is the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, which is only for the convenience of describing the utility model and simplifying the description, and does not indicate or imply that the indicated device or element must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the utility model.

[0032] Figure 1 The utility model embodiment one, telescopic device after hiding shell's three-dimensional structure schematic diagram is shown. Figure 3 The utility model embodiment one, telescopic device sleeve's three-dimensional structure schematic diagram is shown. Figure 1 And Figure 3 Please telescopic device includes screw rod 2, sleeve 1, motor 31 and connecting seat 5.Screw rod 2 enters sleeve 1.Sleeve 1 includes first section 11, second section 12 and third section 13 in proper order.Second section 12 is provided with flat position 121, and third section 13 is provided with limit ring 132.Motor 31 is arranged on connecting seat 5, and motor 31 is connected with driving gear 41.Connecting seat 5 connects sleeve 1, and connecting seat 5 contacts flat position 121.The flat shape of flat position 121 can more evenly transmit the stress between sleeve 1 and connecting seat 5, reduces stress concentration, and simultaneously the flat connecting surface can reduce the connection instability caused by inclination or rotation.Enhances the connection stability between connecting seat 5 and sleeve 1, and further increases the stability of the installation of motor 31.

[0033] Among them, third section 13 is provided with driven gear 42, and driven gear 42 engages driving gear 41.Screw rod 2 is provided with driven nut 43.Driven gear 42 is coaxially connected with driven nut 43.Driven gear 42 is directly arranged on sleeve 1 and is not directly connected with screw rod 2, avoids the vibration when moving screw rod 2 to driven gear 42, reduces the vibration that motor 31 receives, prolongs the service life of motor 31.Limit ring 132 is arranged between driven gear 42 and driven nut 43, and fixes the position of driven gear 42 and driven nut 43 on sleeve 1.

[0034] Figure 2 The utility model embodiment one, telescopic device's three-dimensional structure schematic diagram is shown. Figure 1 、 Figure 2 And Figure 3The shell 6 covers the motor 31 and the connecting seat 5. The sleeve 1 and the screw rod 2 pass through the shell 6. Two pins 51 are arranged on the connecting seat 5. The two pins 51 are arranged on two sides of the sleeve 1, and threaded holes 52 are arranged on the ends of the two pins 51 away from the connecting seat 5. Threaded fasteners 7 are screwed into the threaded holes 52 through the shell 6. The pins 51 are connected with the shell 6, and the fixing of the connecting seat 5 directly uses the existing structure, which simplifies the structure of the telescopic device.

[0035] Preferably, a limiting groove 122 is arranged on the second section 12, and the pin 51 passes through the second section 12 along the limiting groove 122. The position of the pin 51 is limited by the limiting groove 122, which further increases the connection strength between the sleeve 1 and the connecting seat 5 and improves the stability of the telescopic device.

[0036] Figure 4 The utility model discloses a telescopic device, which is characterized by the following technical scheme. Figure 1 、 Figure 3 and Figure 4 The target object is arranged on the driven gear 42. The sensor is arranged on the connecting seat 5 to detect the target object. When the sleeve 1 is arranged vertically, the sensor is arranged above the driven gear 42 along the axial direction of the sleeve 1. The driven gear 42 rotates synchronously with the screw rod 2, that is, the number of rotations of the screw rod 2 can be accurately detected by the cooperation of the sensor and the target object. Meanwhile, the detection process is not affected by the state of the driving gear 41, which avoids the influence of the assembly error between the driving gear 41 and the output shaft and the assembly error between the driving gear 41 and the driven gear 42 on the detection accuracy.

[0037] Preferably, a stepped groove 44 is arranged at the screw port of the driven nut 43, and the limiting ring 132 is arranged in the stepped groove 44. The driven nut 43 can be attached to the driven gear 42, which increases the connection stability between the driven nut 43 and the driven gear 42.

[0038] Please refer to Figure 1 and Figure 3 The first step 14 is formed by the difference between the first section 11 and the second section 12. The connecting seat 5 contacts the first step 14. The first step 14 quickly positions the connecting seat 5, and at the same time, the first step 14 supports the connecting seat 5, which enhances the connection stability between the connecting seat 5 and the sleeve 1.

[0039] Preferably, the second step 131 is formed by the difference between the second section 12 and the third section 13. Specifically, the driven gear 42 contacts the second step 131. The second step 131 quickly positions the driven gear 42, and at the same time, the second step 131 supports the driven gear 42, which enhances the connection stability between the driven gear 42 and the sleeve 1.

[0040] More preferably, the motor 31 is connected to the speed reducer 32. The driving gear 41 is arranged on the output shaft of the speed reducer 32. The torque output by the motor 31 is adjusted and transmitted through the speed reducer to provide better adaptability.

[0041] The specific working process of the utility model is as follows:

[0042] When the telescopic device is telescoped, the motor 31 is started, and the motor 31 drives the driving gear 41 to rotate through the speed reducer 32. The driving gear 41 drives the driven gear 42 to rotate, and the driven gear 42 drives the driven nut 43 to rotate synchronously. The synchronously rotating driven nut 43 transmits the torque to the screw rod 2 through the thread, so that the screw rod 2 rotates and extends out of or into the sleeve 1. The telescopic device is realized.

[0043] The technical features of the above embodiments can be combined arbitrarily. In order to make the description simple, all possible combinations of the technical features in the above embodiments are not described, however, as long as the combination of the technical features does not exist contradictory, it should be considered that it is within the scope of the present application.

[0044] The above embodiments only express several implementation manners of the utility model, the description is more specific and detailed, but it should not be understood as the limitation of the scope of the utility model patent. It should be pointed out that for ordinary skilled in the art, on the premise of not departing from the concept of the utility model, a number of modifications and improvements can be made, which belong to the protection scope of the utility model. Therefore, the protection scope of the utility model patent should be subject to the appended claims.

Claims

1. A telescoping device, characterized by, The telescopic device comprises a screw rod, a sleeve, a motor and a connecting base; the screw rod extends into the sleeve; The sleeve comprises a first section, a second section and a third section in sequence; a flat position is arranged on the second section; a limiting ring is arranged on the third section; The motor is arranged on the connecting base; the motor is connected with a driving gear; The connecting base is connected with the sleeve; the connecting base contacts the flat position; The third section is provided with a driven gear; the driven gear engages with the driving gear; a driven nut is arranged on the screw rod; the driven gear is coaxially connected with the driven nut; the limiting ring is arranged between the driven gear and the driven nut.

2. The retraction device of claim 1, wherein: Further comprising an outer shell; the outer shell covers the motor and the connecting base; the sleeve and the screw rod pass through the outer shell; two bolts are arranged on the connecting base; the two bolts are arranged on two sides of the sleeve; the ends of the two bolts away from the connecting base are provided with threaded holes; threaded fasteners pass through the outer shell and are screwed into the threaded holes.

3. The retraction apparatus of claim 2, wherein: A limiting groove is further arranged on the second section; the bolts pass over the second section along the limiting groove.

4. The retraction apparatus of claim 1, wherein: A target object is arranged on the driven gear; a sensor is arranged on the connecting base to detect the target object; when the sleeve is arranged vertically, the sensor is arranged directly above the driven gear along the axial direction of the sleeve.

5. The retraction apparatus of claim 1, wherein: A stepped groove is arranged at the screw port of the driven nut; the limiting ring is arranged in the stepped groove.

6. The retraction apparatus of claim 1, wherein: A first step is formed between the first section and the second section; the connecting base contacts the first step.

7. The retraction apparatus of claim 1, wherein: A second step is formed between the second section and the third section.

8. The retraction apparatus of claim 1, wherein: The motor is connected with a speed reducer; the driving gear is arranged on the output shaft of the speed reducer.

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