Double-parallel-lead-screw push rod lifting device

Abstract

The utility model discloses a double-parallel-lead-screw push rod lifting device which comprises a first sleeve shell, a second sleeve shell, a push rod, a first-stage lead screw, a first-stage nut, a transmission shaft, a second-stage lead screw, a second-stage nut and a driving mechanism. The second sleeve shell is in sliding fit with the first sleeve shell; the push rod is in sliding fit with the second sleeve shell; one end of the first-stage lead screw is rotatably mounted on the first sleeve shell; the first-stage nut is fixed to the second sleeve shell and matched with the first-stage lead screw. One end of the transmission shaft is rotatably mounted on the first sleeve shell; one end of the second-stage lead screw is rotatably mounted on the second sleeve shell, and the second-stage lead screw is arranged on the transmission shaft in a sleeving manner; the second-stage nut is fixed to the push rod and matched with the second-stage lead screw. The driving mechanism is installed on the first sleeve shell, and the driving mechanism is in transmission connection with the first-stage lead screw and is in transmission connection with the second-stage lead screw through a transmission shaft. The driving mechanism drives the second sleeve shell to slide relative to the first sleeve shell, and meanwhile the push rod slides relative to the second sleeve shell, so that the combination space is saved, and large-stroke operation is met.

Description

Technical Field

[0001] The utility model relates to the technical field of secondary lifting equipment, in particular to a double parallel screw push rod lifting device. Background Art

[0002] Some large mobile equipment need to be supported or even raised using support legs when placed, and the support legs need to be retracted when idle to reduce space occupied, so the support legs usually use two-stage electric push rods.

[0003] There are many ways to lift two-stage, including screw, drag chain and hydraulic jacking, etc. In the narrow space of the building, in order to drive the actuator to complete various complex working conditions, how to use the combination of mechanisms to complete the working requirements of small volume and large stroke is the direction that needs to be studied for two-stage or multi-stage lifting. Utility Model Content

[0004] The technical problem to be solved by the utility model is to provide a double parallel screw push rod lifting device, which greatly saves the combination space, meets the needs of large stroke operation and has a fast lifting speed.

[0005] In order to solve the above technical problems, the technical solution adopted by the utility model is: a double parallel screw push rod lifting device, comprising:

[0006] The first shell;

[0007] a second shell, the second shell being slidably matched with the first shell;

[0008] a push rod, the push rod being slidably engaged with the second housing;

[0009] A primary screw, one end of which is rotatably mounted on the first housing;

[0010] A primary nut, the primary nut is fixedly mounted on the second housing, and the primary nut is threadably matched with the primary lead screw;

[0011] A transmission shaft, one end of which is rotatably mounted on the first housing;

[0012] A secondary lead screw, one end of which is rotatably mounted on the second housing, and the secondary lead screw is sleeved on the transmission shaft and slidably matched with the transmission shaft;

[0013] A secondary nut, the secondary nut is fixedly mounted on the push rod, and the secondary nut is matched with the secondary lead screw thread;

[0014] A driving mechanism is installed on the first housing, the driving mechanism is connected to the primary lead screw transmission, and the driving mechanism is connected to the secondary lead screw transmission through the transmission shaft.

[0015] Furthermore, the cross-sections of the first shell, the second shell and the push rod are all non-circular.

[0016] Furthermore, the transmission shaft is a spline shaft.

[0017] Furthermore, a rotatable spline sleeve is provided on the second housing, the spline sleeve cooperates with the spline shaft, and the spline sleeve is plug-fitted with the secondary lead screw.

[0018] Furthermore, a driving gear is provided at the output end of the driving mechanism, and a first driven gear matching with the driving gear is provided at one end of the primary lead screw.

[0019] Furthermore, a second driven gear matched with the driving gear is provided at one end of the transmission shaft.

[0020] Furthermore, the driving gear, the first driven gear and the second driven gear are all helical gears.

[0021] Furthermore, a first row of needle rollers is provided between the first shell and the second shell.

[0022] Furthermore, a second needle roller row is provided between the push rod and the second housing.

[0023] Furthermore, the driving mechanism is a motor.

[0024] The beneficial effects of the utility model are as follows: the dual parallel screw push rod lifting device drives the second housing to slide and rise relative to the first housing through the driving mechanism, and also makes the push rod slide and rise relative to the second housing, which not only greatly saves the combined space and satisfies the large stroke operation in a narrow space, but also has a simple structure and a fast lifting speed. By rotating the primary screw, the primary nut can be lifted and lowered along the primary screw, thereby driving the second housing to slide and rise relative to the first housing, which is stable and reliable, and has a simple structure; the transmission shaft can transmit the torque from the driving mechanism to the secondary screw, so that the secondary screw rotates, thereby making the secondary nut lift and fall along the secondary screw, thereby driving the push rod to slide and rise relative to the second housing, which is stable and reliable, and has a simple structure. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 This is a schematic diagram of the overall structure of a double parallel screw push rod lifting device according to Embodiment 1 of the utility model;

[0026] Figure 2 The schematic diagram of the partial structure of the double parallel screw push rod lifting device of the first embodiment of the utility model Figure 1 ;

[0027] Figure 3The schematic diagram of the partial structure of the double parallel screw push rod lifting device of the first embodiment of the utility model Figure 2 ;

[0028] Figure 4 This is a structural schematic diagram of the first housing in the double parallel screw push rod lifting device of the first embodiment of the utility model;

[0029] Figure 5 This is a schematic structural diagram of the second housing in the double parallel screw push rod lifting device of the first embodiment of the utility model;

[0030] Figure 6 This is a schematic structural diagram of a push rod in a double parallel screw push rod lifting device according to Embodiment 1 of the utility model.

[0031] Description of labels:

[0032] 1. first housing; 11. first cylinder wall; 12. first assembly seat;

[0033] 2. second housing; 21. second cylinder wall; 22. second assembly seat;

[0034] 3. Push rod; 31. Third cylinder wall; 32. Third assembly seat; 33. Bottom plate;

[0035] 41. primary lead screw; 411. first driven gear; 42. primary nut;

[0036] 5. Transmission shaft; 51. Spline sleeve; 52. Second driven gear;

[0037] 61. Secondary screw; 62. Secondary nut;

[0038] 7. Driving mechanism; 71. Driving gear;

[0039] 81. First row of needle rollers; 82. Second row of needle rollers. DETAILED DESCRIPTION

[0040] In order to explain the technical content, achieved objectives and effects of the present invention in detail, the following is an explanation in conjunction with the implementation modes and the accompanying drawings.

[0041] Please refer to Figures 1 to 6 , double parallel screw push rod lifting device, including:

[0042] The first shell 1;

[0043] A second shell 2, wherein the second shell 2 is slidably matched with the first shell 1;

[0044] A push rod 3, wherein the push rod 3 is slidably matched with the second housing 2;

[0045] A primary screw 41, one end of which is rotatably mounted on the first housing 1;

[0046] A primary nut 42, wherein the primary nut 42 is fixedly mounted on the second housing 2, and the primary nut 42 is threadedly matched with the primary lead screw 41;

[0047] A transmission shaft 5, one end of which is rotatably mounted on the first housing 1;

[0048] A secondary lead screw 61, one end of which is rotatably mounted on the second housing 2, and the secondary lead screw 61 is sleeved on the transmission shaft 5 and slidably cooperates with the transmission shaft 5;

[0049] A secondary nut 62, wherein the secondary nut 62 is fixedly mounted on the push rod 3, and the secondary nut 62 is threadedly matched with the secondary lead screw 61;

[0050] The driving mechanism 7 is installed on the first housing 1 , the driving mechanism 7 is transmission-connected to the primary lead screw 41 , and the driving mechanism 7 is transmission-connected to the secondary lead screw 61 through the transmission shaft 5 .

[0051] From the above description, it can be seen that the beneficial effect of the utility model is that the dual parallel screw push rod lifting device drives the second housing 2 to slide and rise relative to the first housing 1 through the driving mechanism 7, and also makes the push rod 3 slide and rise relative to the second housing 2, which not only greatly saves the combination space and satisfies the large stroke operation in a narrow space, but also has a simple structure and a fast lifting speed. By rotating the primary screw 41, the primary nut 42 can be lifted and lowered along the primary screw 41, thereby driving the second housing 2 to slide and rise relative to the first housing 1, which is stable and reliable, and has a simple structure; the transmission shaft 5 can transfer the torque from the driving mechanism 7 to the secondary screw 61, so that the secondary screw 61 rotates, thereby making the secondary nut 62 lift and lower along the secondary screw 61, thereby driving the push rod 3 to slide and rise relative to the second housing 2, which is stable and reliable, and has a simple structure.

[0052] Furthermore, the cross-sections of the first housing 1, the second housing 2 and the push rod 3 are all non-circular.

[0053] It can be seen from the above description that the first housing 1 and the second housing 2, and the second housing 2 and the push rod 3 will not rotate relative to each other, so that the relative sliding process cannot be realized.

[0054] Furthermore, the transmission shaft 5 is a spline shaft.

[0055] It can be seen from the above description that the transmission shaft 5 is easy to obtain and can stably transmit a large torque.

[0056] Furthermore, a rotatable spline sleeve 51 is provided on the second housing 2 , and the spline sleeve 51 is matched with the spline shaft, and the spline sleeve 51 is plug-fitted with the secondary lead screw 61 .

[0057] It can be seen from the above description that using the spline sleeve 51 to transmit the torque from the spline shaft to the secondary lead screw 61 can reduce the production difficulty of the secondary lead screw 61, which is conducive to reducing the production cost.

[0058] Furthermore, a driving gear 71 is provided at the output end of the driving mechanism 7 , and a first driven gear 411 cooperating with the driving gear 71 is provided at one end of the primary lead screw 41 .

[0059] It can be seen from the above description that the transmission structure between the driving mechanism 7 and the primary lead screw 41 is simple and can stably transmit a large torque.

[0060] Furthermore, a second driven gear 52 matched with the driving gear 71 is provided at one end of the transmission shaft 5 .

[0061] It can be seen from the above description that the transmission structure between the driving mechanism 7 and the transmission shaft 5 is simple and can stably transmit a large torque.

[0062] Furthermore, the driving gear 71 , the first driven gear 411 and the second driven gear 52 are all helical gears.

[0063] From the above description, it can be seen that the helical gear transmission is stable, and the impact, vibration and noise are small, which is beneficial to prolonging the service life of the double parallel screw push rod lifting device and reducing noise.

[0064] Furthermore, a first needle roller row 81 is provided between the first shell 1 and the second shell 2 .

[0065] From the above description, it can be seen that the first needle roller row 81 can change the surface contact between the first shell 1 and the second shell 2 to line contact, thereby reducing friction, making the relative sliding process of the first shell 1 and the second shell 2 smoother and reducing the power requirement of the drive mechanism 7.

[0066] Furthermore, a second needle roller row 82 is provided between the push rod 3 and the second housing 2 .

[0067] From the above description, it can be seen that the second needle roller row 82 can change the surface contact between the push rod 3 and the second housing 2 to line contact, thereby reducing friction, making the relative sliding process of the push rod 3 and the second housing 2 smoother and reducing the power requirement of the drive mechanism 7.

[0068] Furthermore, the driving mechanism 7 is a motor.

[0069] It can be seen from the above description that the driving mechanism 7 is easy to obtain, which is beneficial to reducing production costs.

[0070] Please refer to Figures 1 to 6 , Embodiment 1 of the present utility model is: a double parallel lead screw push rod lifting device, comprising a first housing 1, a second housing 2, a push rod 3, a primary lead screw 41, a primary nut 42, a transmission shaft 5, a secondary lead screw 61, a secondary nut 62 and a driving mechanism 7; the second housing 2 is slidably matched with the first housing 1; the push rod 3 is slidably matched with the second housing 2; one end of the primary lead screw 41 is rotatably mounted on the first housing 1; the primary nut 42 is fixedly mounted on the second housing 2, and the primary nut 42 is threadedly matched with the primary lead screw 41; one end of the transmission shaft 5 is rotatably mounted on the first housing 1; one end of the secondary lead screw 61 is rotatably mounted on the second housing 2, and the secondary lead screw 61 is sleeved on the transmission shaft 5 and slidably matched with the transmission shaft 5; the secondary nut 62 is fixedly mounted on the push rod 3, and the secondary nut 62 is threadedly matched with the secondary lead screw 61; the driving mechanism 7 is mounted on the first housing 1, the driving mechanism 7 is transmission-connected with the primary lead screw 41, and the driving mechanism 7 is transmission-connected with the secondary lead screw 61 through the transmission shaft 5.

[0071] Specifically, the driving mechanism 7 is preferably a motor. The cross sections of the first housing 1, the second housing 2 and the push rod 3 are all non-circular. In the present embodiment, the first housing 1 comprises a first cylinder wall 11 and a first assembly seat 12, the first assembly seat 12 is fixedly mounted in the first cylinder wall 11 and arranged near the top opening of the first cylinder wall 11, the driving mechanism 7 is mounted on the first assembly seat 12, the second housing 2 comprises a second cylinder wall 21 and a second assembly seat 22, the second assembly seat 22 is fixedly mounted at the top opening of the second cylinder wall 21, the push rod 3 comprises a third cylinder wall 31, a third assembly seat 32 and a bottom plate 33, the third assembly seat 32 is fixedly mounted at the top opening of the third cylinder wall 31, and the bottom plate 33 is fixedly mounted at the bottom opening of the third cylinder wall 31. The second cylinder wall 21 of the second housing 2 is sleeved on the third cylinder wall 31 of the push rod 3, and the first cylinder wall 11 of the first housing 1 is sleeved on the second cylinder wall 21 of the second housing 2. The first tube wall 11, the second tube wall 21 and the third tube wall 31 are all rectangular tube-shaped, and their cross sections are all rectangular, and the cross sections are perpendicular to the length direction of the first tube wall 11, the second tube wall 21 and the third tube wall 31. As a preferred embodiment, the push rod 3 also includes a foot pad, which is rotatably connected to the bottom of the bottom plate 33.

[0072] One end of the primary lead screw 41 is rotatably mounted on the first assembly seat 12 of the first housing 1, a first bearing is arranged between the primary lead screw 41 and the first assembly seat 12, and a first avoidance hole for the primary lead screw 41 to pass through is respectively arranged on the second assembly seat 22 of the second housing 2 and the third assembly seat 32 of the push rod 3. The primary nut 42 is fixedly mounted in the second assembly seat 22 of the second housing 2. The axial direction of the transmission shaft 5 is parallel to the axial direction of the primary lead screw 41, one end of the transmission shaft 5 is rotatably mounted on the first assembly seat 12 of the first housing 1, and a second bearing is arranged between the transmission shaft 5 and the first assembly seat 12. The axial direction of the secondary lead screw 61 is colinear with the axial direction of the transmission shaft 5, one end of the secondary lead screw 61 is rotatably mounted on the second assembly seat 22 of the second housing 2, a third bearing is arranged between the secondary lead screw 61 and the second assembly seat 22, and a second avoidance hole for the secondary lead screw 61 to pass through is arranged on the third assembly seat 32 of the push rod 3. The secondary nut 62 is fixedly installed in the third assembly seat 32 of the push rod 3 .

[0073] Preferably, the transmission shaft 5 is a spline shaft. A rotatable spline sleeve 51 is provided on the second housing 2, the spline sleeve 51 cooperates with the spline shaft, and the spline sleeve 51 is plugged and matched with the secondary lead screw 61. Specifically, the axial direction of the spline sleeve 51 is colinear with the axial direction of the secondary lead screw 61. Four protrusions are provided at one end of the spline sleeve 51, and the four protrusions are evenly distributed around the axial direction of the spline sleeve 51, and four slots corresponding to the four protrusions are provided at one end of the secondary lead screw 61.

[0074] The output end of the driving mechanism 7 is provided with a driving gear 71, and one end of the primary lead screw 41 is provided with a first driven gear 411 that matches the driving gear 71. One end of the transmission shaft 5 is provided with a second driven gear 52 that matches the driving gear 71. In this embodiment, the driving gear 71, the first driven gear 411 and the second driven gear 52 are all helical gears.

[0075] A first needle roller row 81 is provided between the first shell 1 and the second shell 2, and a second needle roller row 82 is provided between the push rod 3 and the second shell 2. Specifically, three first needle roller rows 81 are provided at the bottom ends of the four inner side surfaces of the first cylinder wall 11 of the first shell 1, and two first needle roller rows 81 are provided at the top ends of the four outer side surfaces of the second cylinder wall 21 of the second shell 2. Two second needle roller rows 82 are provided at the bottom ends of the four inner side surfaces of the second cylinder wall 21 of the second shell 2, and two second needle roller rows 82 are provided at the top ends of the four inner side surfaces of the third cylinder wall 31 of the push rod 3.

[0076] The working principle of the embodiment of the utility model is as follows: when the dual parallel screw push rod lifting device needs to extend or retract its length, the driving mechanism 7 drives the driving gear 71 to rotate, and the first driven gear 411 drives the primary screw 41 to rotate relative to the first housing 1 under the drive of the driving gear 71, and the primary nut 42 drives the second housing 2 to slide along the axial direction of the primary screw 41 under the drive of the primary screw 41, and at the same time, the second housing 2 drives the secondary screw 61 to slide along the axial direction of the transmission shaft 5; the second driven gear 52 drives the transmission shaft 5 to rotate under the drive of the driving gear 71, and the transmission shaft 5 drives the secondary screw 61 to rotate relative to the second housing 2, and the secondary nut 62 drives the push rod 3 to slide along the axial direction of the secondary screw 61 under the drive of the secondary screw 61.

[0077] In summary, the double parallel screw push rod lifting device provided by the utility model drives the second shell to slide and rise relative to the first shell through the driving mechanism, and also makes the push rod slide and rise relative to the second shell, which not only greatly saves the combination space and satisfies the large stroke operation in a narrow space, but also has a simple structure and a fast lifting speed. By rotating the primary screw, the primary nut can be lifted and lowered along the primary screw, thereby driving the second shell to slide and rise relative to the first shell, which is stable and reliable, and has a simple structure; the transmission shaft can transmit the torque from the driving mechanism to the secondary screw, so that the secondary screw rotates, thereby causing the secondary nut to lift and rise along the secondary screw, thereby driving the push rod to slide and rise relative to the second shell, which is stable and reliable, and has a simple structure.

[0078] The above description is only an embodiment of the present invention, and does not limit the patent scope of the present invention. Any equivalent transformations made using the contents of the specification and drawings of the present invention, or directly or indirectly applied in the relevant technical field, are also included in the patent protection scope of the present invention.

Claims

1. Double parallel screw push rod lifting device, characterized in that: include: The first shell; a second shell, the second shell being slidably matched with the first shell; a push rod, the push rod being slidably engaged with the second housing; A primary screw, one end of which is rotatably mounted on the first housing; A primary nut, the primary nut is fixedly mounted on the second housing, and the primary nut is threadably matched with the primary lead screw; A transmission shaft, one end of which is rotatably mounted on the first housing; A secondary lead screw, one end of which is rotatably mounted on the second housing, and the secondary lead screw is sleeved on the transmission shaft and slidably matched with the transmission shaft; A secondary nut, the secondary nut is fixedly mounted on the push rod, and the secondary nut is matched with the secondary lead screw thread; A driving mechanism is installed on the first housing, the driving mechanism is connected to the primary lead screw transmission, and the driving mechanism is connected to the secondary lead screw transmission through the transmission shaft.

2. The dual parallel screw push rod lifting device according to claim 1, characterized in that: The cross sections of the first shell, the second shell and the push rod are all non-circular.

3. The dual parallel screw push rod lifting device according to claim 1, characterized in that: The transmission shaft is a spline shaft.

4. The dual parallel screw push rod lifting device according to claim 3, characterized in that: The second housing is provided with a rotatable spline sleeve, the spline sleeve is matched with the spline shaft, and the spline sleeve is plug-fitted with the secondary lead screw.

5. The dual parallel screw push rod lifting device according to claim 1, characterized in that: A driving gear is disposed at the output end of the driving mechanism, and a first driven gear matched with the driving gear is disposed at one end of the primary lead screw.

6. The dual parallel screw push rod lifting device according to claim 5, characterized in that: A second driven gear matched with the driving gear is provided at one end of the transmission shaft.

7. The dual parallel screw push rod lifting device according to claim 6, characterized in that: The driving gear, the first driven gear and the second driven gear are all helical gears.

8. The dual parallel screw push rod lifting device according to claim 1, characterized in that: A first row of needle rollers is disposed between the first shell and the second shell.

9. The dual parallel screw push rod lifting device according to claim 1, characterized in that: A second needle roller row is provided between the push rod and the second housing.

10. The dual parallel screw push rod lifting device according to claim 1, characterized in that: The driving mechanism is a motor.

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