Bidirectional telescopic mechanism

Abstract

The utility model belongs to the technical field of mechanical equipment, is suitable for a building main body steel structure and provides pressing force for a steel template, and particularly relates to a bidirectional telescopic mechanism which comprises a shell, an extending opening, a connecting plate, a ball bearing, a lead screw and a guide mechanism, the extending opening is formed in the shell, the connecting plate is connected to the shell, a bearing sleeve is arranged on the connecting plate, and the ball bearing is arranged on the lead screw. The bearing sleeves are symmetrically arranged on the two sides in the width direction of the shell, the ball bearings are connected into the bearing sleeves and driven by the driving mechanism, the lead screws are in threaded transmission connection into the ball bearings and are slidably connected into the extending openings, and the two lead screws in threaded transmission connection with the ball bearings are rotationally and symmetrically arranged. Compared with the prior art, in the pushing process, the pushing direction is stable, the bearing capacity is high, and driving can be completed only through one driving device.

Description

Technical Field

[0001] The utility model relates to the technical field of mechanical equipment, in particular to a bidirectional telescopic mechanism. Background Art

[0002] A two-way telescopic mechanism is a device that can achieve flexible extension and contraction in two directions. It is usually composed of multiple mutually cooperating parts, such as nested sleeves, precision slide rails or movable connecting rods, etc. These parts achieve smooth and precise telescopic functions through ingenious connection and transmission methods.

[0003] Its working principle varies according to different types, and the common ones are hydraulic drive, screw drive and mechanical linkage. The two-way telescopic mechanism is widely used in various fields. In engineering construction, such as the crane boom and the lifting platform used in construction, it is indispensable. It can quickly adjust the length and height according to work requirements.

[0004] The traditional screw bidirectional telescopic mechanism is realized by a ball screw and a ball slide. The telescopic mechanism using this method is that the screw rotates and extends. This method has poor directional stability when extending, which is particularly obvious when pushing large mass objects. Shaking will occur during the pushing process. Therefore, it is necessary to develop a bidirectional telescopic mechanism with stable telescopic direction. Utility Model Content

[0005] In view of the deficiencies in the prior art, the utility model develops a bidirectional telescopic mechanism, which has a stable pushing direction during the pushing process and a strong bearing capacity. The driving can be completed by only one driving device, and the transmission mode of the transmission screw rod and the nut is changed, and the two are interchangeable.

[0006] The technical solution to the technical problem solved by the utility model is: a two-way telescopic mechanism, comprising a shell, an extension port, a connecting plate, a ball bearing, a screw rod and a guide mechanism, the extension port is arranged on the shell, the connecting plate is connected to the shell, a bearing sleeve is arranged on the connecting plate, the bearing sleeve is symmetrically arranged on both sides along the width direction of the shell, the ball bearing is connected in the bearing sleeve, the ball bearing is driven by a driving mechanism, the screw rod is threadedly connected in the ball bearing and is slidably connected in the extension port, and two screw rods threadedly connected to the ball bearing are rotationally symmetrically arranged.

[0007] Preferably, the driving mechanism includes a first gear, a second gear and a three-phase AC motor, the first gear is connected to the ball bearing via a nut, the two first gears connected to the ball bearings are meshingly connected, the second gear is meshingly connected to the first gear, the three-phase AC motor is connected to the housing via a mounting plate, and the second gear is connected to the output end of the three-phase AC motor.

[0008] Preferably, a through hole is provided on the mounting plate at a position corresponding to the screw rod, a bearing sleeve is connected in the through hole, a thrust bearing is connected in the bearing sleeve, and the thrust bearing is arranged on a side of the rolling bearing close to the extension port.

[0009] Preferably, the guide mechanism includes a positioning block and a slide groove, the slide groove is arranged at the bottom of the shell, the slide groove is arranged on the side of the ball bearing away from the extension port, the positioning block is arranged on the side of the screw rod close to the slide groove, and the positioning block is slidably connected in the slide groove.

[0010] Preferably, a displacement sensor is disposed inside the shell, and the displacement sensor is connected to the shell via a bracket.

[0011] The effects provided in the utility model content are only the effects of the embodiments, not all the effects of the utility model. The above technical solution has the following advantages or beneficial effects:

[0012] 1. By arranging the ball bearing and the screw rod, the ball bearing rotates to drive the screw rod to extend. The screw rod does not rotate during the extension process. With the guide device, it can achieve no shaking during the advancement process, the direction is more stable, and a good self-locking function is achieved when stopping;

[0013] 2. By setting up thrust bearings, the load-bearing capacity can be improved to push large mass objects;

[0014] 3. By meshing the two first gears with each other, one of the first gears is meshed with the second gear, and the extension and retraction of the screw rod in two directions can be driven by a power device;

[0015] 4. By setting up a displacement sensor, the signal is sent to the controller, and the controller controls the start and stop of the three-phase AC motor to achieve precise extension and retraction. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is the front view of the utility model;

[0017] Figure 2 for Figure 1 Sectional view in the AA direction;

[0018] Figure 3 for Figure 1 Cross-sectional view in the BB direction;

[0019] Figure 4 It is the overall structural diagram of the utility model;

[0020] Figure 5 It is a right side view of the utility model;

[0021] Figure 6 for Figure 5Cross-sectional view along the AA direction.

[0022] Among them: 1. Shell; 101. Slide groove; 102. Extension port; 2. Connecting plate; 3. Bearing sleeve; 4. Ball bearing; 41. First gear; 42. Nut; 5. Screw rod; 51. Positioning block; 6. Second gear; 61. Three-phase AC motor; 611. Mounting plate; 7. Thrust bearing; 8. Displacement sensor. DETAILED DESCRIPTION

[0023] In order to clearly illustrate the technical features of the present invention, the present invention is described in detail below through specific implementation methods and in conjunction with the accompanying drawings.

[0024] Example 1

[0025] See also Figures 1 to 6 A two-way telescopic mechanism comprises a shell 1, an extension port 102, a connecting plate 2, a ball bearing 4, a screw rod 5 and a guide mechanism, wherein the extension port 102 is arranged on the shell 1, the connecting plate 2 is connected to the shell 1, a bearing sleeve 3 is arranged on the connecting plate 2, the bearing sleeve 3 is symmetrically arranged on both sides along the width direction of the shell 1, the ball bearing 4 is connected to the bearing sleeve 3, the ball bearing 4 is driven by a driving mechanism, the screw rod 5 is threadedly connected to the ball bearing 4, and is slidably connected to the extension port 102, and two screw rods 5 threadedly connected to the ball bearing 4 are rotationally symmetrically arranged.

[0026] like Figure 3 and Figure 6 As shown, the driving mechanism includes a first gear 41, a second gear 6 and a three-phase AC motor 61, the first gear 41 is connected to the ball bearing 4 through a nut 42, the two first gears 41 connected to the ball bearing 4 are meshedly connected, the second gear 6 is meshedly connected to the first gear 41, the three-phase AC motor 61 is connected to the housing 1 through a mounting plate 611, and the second gear 6 is connected to the output end of the three-phase AC motor 61.

[0027] like Figure 3 , Figure 4 and Figure 6 As shown, a through hole is provided at a position corresponding to the screw rod 5 on the mounting plate 611, a bearing sleeve 3 is connected in the through hole, a thrust bearing 7 is connected in the bearing sleeve 3, and the thrust bearing 7 is provided on a side of the rolling bearing close to the extension port 102.

[0028] like Figure 2 and Figure 6As shown, the guide mechanism includes a positioning block 51 and a slide groove 101, the slide groove 101 is arranged at the bottom of the shell 1, the slide groove 101 is arranged on the side of the ball bearing 4 away from the extension port 102, the positioning block 51 is arranged on the side of the screw rod 5 close to the slide groove 101, and the positioning block 51 is slidably connected in the slide groove 101.

[0029] like Figure 2 and Figure 6 As shown, a displacement sensor 8 is disposed inside the housing 1 , and the displacement sensor 8 is connected to the housing 1 via a bracket.

[0030] Principle and operation process

[0031] The utility model adopts a three-phase AC motor 61 as a power source, and adopts a controller to receive the signal of the displacement sensor 8 and control the three-phase AC motor 61; the output end of the three-phase AC motor 61 is connected to the second gear 6, and the second gear 6 is meshed with one of the two mutually meshing first gears 41. The first gear 41 is connected to the ball bearing 4 through a nut 42. When the three-phase AC motor 61 drives the second gear 6 to rotate, it drives the first gear 41 to rotate, and then drives the ball bearing 4 to rotate. Since the screw rod 5 is threadedly connected to the ball bearing 4, the rotation of the ball bearing 4 prompts the screw rod 5 to move linearly along the direction of the extension port 102, thereby realizing the non-rotating extension action of the screw rod 5. A slide groove 101 is provided on the screw rod 5 near the bottom of the housing 1, and a positioning block 51 matching the slide groove 101 is provided at the bottom of the housing 1 near the extension port 102. When the screw rod 5 is extended and retracted under the drive of the ball bearing 4, the slide groove 101 slides along the positioning block 51, ensuring that the screw rod 5 always moves along a predetermined straight line direction during the extension process without shaking, thereby ensuring the stability of the extension direction. The displacement sensor 8 provided inside the housing 1 monitors the displacement of the screw rod 5 in real time and sends a signal to the controller. The controller precisely controls the three-phase AC motor 61 according to the preset parameters and the received signal of the displacement sensor 8; when the screw rod 5 is extended and retracted to the predetermined position, the controller controls the three-phase AC motor 61 to stop working, thereby achieving precise extension and retraction control.

[0032] A thrust bearing 7 is arranged in the bearing sleeve 3 connected to the through hole at the corresponding position of the screw rod 5 on the mounting plate 611, and the thrust bearing 7 is located on the side of the rolling bearing close to the extension port 102. When the screw rod 5 pushes an object, the axial force generated will be transmitted to the thrust bearing 7 through the ball bearing 4. The thrust bearing 7 can withstand a large axial load, thereby improving the bearing capacity of the entire bidirectional telescopic mechanism, enabling it to push a large mass object; the two first gears 41 are meshed and connected to each other, and one of the first gears 41 is also meshed and connected to the second gear 6, so that when the three-phase AC motor 61 drives the second gear 6 to rotate, through the transmission effect between the gears, the two first gears 41 will rotate in opposite directions at the same time. The two screw rods 5 connected to the ball bearing 4 with thread transmission are arranged in rotational symmetry, that is, one is a forward thread and the other is a reverse thread; when the two first gears 41 rotate, they respectively drive the ball bearings 4 connected thereto to rotate. Since the thread rotation directions of the screw rods 5 are opposite, under the drive of the ball bearings 4, the two screw rods 5 will telescope in opposite directions at the same time, realizing bidirectional synchronous telescopic movement.

[0033] Although the specific implementation methods of the utility model are described above in conjunction with the accompanying drawings, it is not intended to limit the scope of protection of the utility model. On the basis of the technical solution of the utility model, various modifications or deformations that can be made by technical personnel in this field without creative work are still within the scope of protection of the utility model.

Claims

1. A two-way telescopic mechanism, characterized in that: The invention comprises a housing (1), a projection opening (102), a connecting plate (2), a ball bearing (4), a screw rod (5) and a guide mechanism, wherein the projection opening (102) is arranged on the housing (1), the connecting plate (2) is connected to the housing (1), a bearing sleeve (3) is arranged on the connecting plate (2), the bearing sleeve (3) is symmetrically arranged on both sides along the width direction of the housing (1), the ball bearing (4) is connected to the bearing sleeve (3), the ball bearing (4) is driven by a driving mechanism, the screw rod (5) is threadedly connected to the ball bearing (4) and is slidably connected to the projection opening (102), and two screw rods (5) threadedly connected to the ball bearing (4) are rotationally symmetrically arranged.

2. A bidirectional telescopic mechanism according to claim 1, characterized in that: The driving mechanism comprises a first gear (41), a second gear (6) and a three-phase AC motor (61); the first gear (41) is connected to a ball bearing (4) via a nut (42); the two first gears (41) connected to the ball bearing (4) are meshingly connected; the second gear (6) is meshingly connected to the first gear (41); the three-phase AC motor (61) is connected to the housing (1) via a mounting plate (611); and the second gear (6) is connected to an output end of the three-phase AC motor (61).

3. A bidirectional telescopic mechanism according to claim 2, characterized in that: A through hole is provided at a position corresponding to the screw rod (5) on the mounting plate (611), a bearing sleeve (3) is connected to the through hole, a thrust bearing (7) is connected to the bearing sleeve (3), and the thrust bearing (7) is provided on a side of the rolling bearing close to the extension opening (102).

4. A bidirectional telescopic mechanism according to claim 1, characterized in that: The guide mechanism comprises a positioning block (51) and a slide groove (101), wherein the slide groove (101) is arranged at the bottom of the housing (1), the slide groove (101) is arranged on a side of the ball bearing (4) away from the extension opening (102), the positioning block (51) is arranged on a side of the screw rod (5) close to the slide groove (101), and the positioning block (51) is slidably connected in the slide groove (101).

5. A bidirectional telescopic mechanism according to claim 1, characterized in that: A displacement sensor (8) is arranged inside the housing (1), and the displacement sensor (8) is connected to the housing (1) via a bracket.

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