Heavy-load CAN electric telescopic cylinder

Abstract

The invention provides a heavy load type CAN electric telescopic cylinder, and belongs to the technical field of electric telescopic cylinders, the heavy load type CAN electric telescopic cylinder comprises a base, a servo motor and a telescopic assembly, the servo motor and the telescopic assembly are arranged on the top of the base, the base comprises a shell, a transmission assembly is arranged in the shell, the telescopic assembly comprises a cylinder sleeve installed on one side of the top of the shell, and a transmission mechanism is rotationally arranged in the cylinder sleeve; a telescopic rod, a first sleeve and a second sleeve are sequentially and movably arranged outside the transmission mechanism, the tops and the bottoms of the telescopic rod, the first sleeve and the second sleeve are open and provided with hollow inner cavities, and a first screw sleeve, a second screw sleeve and a third screw sleeve corresponding to the transmission mechanism are arranged at the bottoms of the telescopic rod, the first sleeve and the second sleeve respectively. External threads are arranged outside the first screw sleeve and the second screw sleeve, and threaded grooves corresponding to the external threads are formed in the upper portions of the interiors of the first sleeve and the second sleeve, so that large-stroke stretching and retracting are achieved through the telescopic rod, the first sleeve and the second sleeve which are matched in a multi-stage nested mode, and the structure is compact.

Description

Technical Field

[0001] The invention relates to the technical field of electric telescopic cylinders, and in particular to a heavy-load CAN electric telescopic cylinder. Background Art

[0002] The electric cylinder is mainly composed of a motor, a reducer, a screw, a nut, a cylinder body, a piston and other parts. The motor provides power, the reducer is used to adjust the output speed and torque, the screw and the nut convert rotational motion into linear motion, the cylinder body protects and supports the internal components, and the piston is connected to the nut to drive the external load to perform linear motion.

[0003] At present, most electric cylinders are limited by the height of their bodies when in use, and the length of their output ends is not long enough. The current solution is to adopt a multi-stage telescopic structure, which is similar to a telescopic antenna or telescope. It consists of multiple concentric sleeves, which are nested step by step from the outside to the inside. The outermost sleeve is generally fixed on the cylinder body, and the inner sleeve can be extended in sequence under the drive of the motor and the transmission mechanism. However, the sleeve wall thickness of this telescopic cylinder is relatively large, and its overall volume is relatively large, which not only affects the production cost, but also increases its own weight and wear. Summary of the invention

[0004] The purpose of the present invention is to provide a heavy-duty CAN electric telescopic cylinder, which solves the problems in the background technology.

[0005] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: a heavy-duty CAN electric telescopic cylinder, comprising a base and a servo motor and a telescopic assembly arranged on the top of the base, the base comprising an outer shell, a transmission assembly being arranged inside the outer shell, the telescopic assembly comprising a cylinder sleeve installed on one side of the top of the outer shell, a transmission mechanism being rotatably arranged inside the cylinder sleeve, a telescopic rod, a first sleeve and a second sleeve being movably arranged on the outside of the transmission mechanism in sequence, the top and bottom of the telescopic rod, the first sleeve and the second sleeve being open, and being provided with a hollow inner cavity, the bottoms of the telescopic rod, the first sleeve and the second sleeve being respectively provided with a first screw sleeve, a second screw sleeve and a third screw sleeve corresponding to the transmission mechanism, the outsides of the first screw sleeve and the second screw sleeve being provided with external threads, and the upper parts of the insides of the first sleeve and the second sleeve being provided with thread grooves corresponding to the external threads.

[0006] Furthermore, the transmission assembly inside the shell includes a transmission gear, a worm wheel and a worm rotatably connected inside the shell, wherein the transmission gear is fixedly connected to the worm wheel, and the worm wheel is meshingly connected to the worm; the output end of the servo motor extends to the inside of the shell and is fixedly connected to a transmission screw, and the transmission screw is meshingly connected to the transmission gear, and the transmission screw is driven by the servo motor to rotate, thereby driving the transmission gear to rotate, the transmission gear drives the worm wheel to rotate, and then the transmission mechanism is driven to rotate through the worm.

[0007] Furthermore, the transmission mechanism includes a turntable fixedly connected to the worm, a connecting rod fixedly connected to the top of the turntable, a threaded rod fixedly connected to the top of the connecting rod, the threaded rod corresponds to the first screw sleeve, the second screw sleeve and the third screw sleeve, the diameter of the connecting rod is smaller than the diameter of the threaded rod, and the connecting rod and the threaded rod are configured as follows: when the telescopic assembly is in a retracted state, the first screw sleeve is threadedly connected to the threaded rod, and the second screw sleeve and the third screw sleeve are located outside the connecting rod.

[0008] Furthermore, three groups of first connecting rods are radially distributed at the bottom of the first sleeve, a third movable groove is provided through the lower interior of the second sleeve, and second movable grooves corresponding to the first connecting rods are radially distributed on the turntable. The first connecting rod passes through the third movable groove and extends into the second movable groove. When the transmission mechanism rotates, the telescopic rod moves upward.

[0009] Furthermore, a second connecting rod is radially distributed on the bottom of the second sleeve, a third movable groove corresponding to the second connecting rod is radially distributed on the turntable, and the third movable groove extends to the inside of the first movable groove, and the first connecting rod is located outside the second movable groove.

[0010] Furthermore, guide grooves are arranged on the outside of the transmission mechanism, the telescopic rod and the first sleeve; guide members are radially distributed above the inside of the cylinder sleeve, the guide members are radially slidably connected to the inside of the cylinder sleeve, and a spring is arranged between the outside of the guide member and the inner wall of the cylinder sleeve; the guide member corresponds to the guide groove, and the cross-sectional shape of the guide member is trapezoidal.

[0011] Furthermore, an opening is provided above the first sleeve, and the size of the opening matches the size of the outer wall of the telescopic rod. An opening is provided above the second sleeve, and the size of the opening matches the size of the outer wall of the first sleeve. The inner cavity size of the second sleeve is configured to allow the external thread outside the first sleeve to move, and the inner cavity size of the first sleeve is configured to allow the external thread outside the telescopic rod to move.

[0012] Compared with the prior art, the present invention has the following beneficial effects:

[0013] The present invention provides a heavy-duty CAN electric telescopic cylinder, which is composed of a first-stage reduction gear composed of a transmission screw and a transmission gear, and a second-stage reduction gear composed of a worm wheel and a worm, and realizes efficient and stable telescopic movement effect under high load under the drive of a servo motor. It utilizes a multi-stage nested telescopic rod, a first sleeve and a second sleeve structure to realize a large-stroke telescopic movement with a compact structure. Compared with traditional multi-stage telescopic cylinders, it effectively reduces the overall volume, reduces space occupancy, and reduces material costs, and solves the problems of thick wall, large volume and high cost of traditional multi-stage telescopic cylinder sleeves. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1It is a schematic diagram of the overall structure of the present invention;

[0015] Figure 2 It is a disassembled diagram of the overall structure of the present invention;

[0016] Figure 3 It is a partial structural schematic diagram of the telescopic assembly of the present invention;

[0017] Figure 4 It is a partial structural cross-sectional view of the telescopic assembly of the present invention;

[0018] Figure 5 It is a cross-sectional view of the telescopic component part of the present invention in a disassembled state;

[0019] Figure 6 It is an exploded view of the partial structure of the telescopic component of the present invention.

[0020] In the figure: 1. base; 11. housing; 12. transmission gear; 13. worm wheel; 14. worm; 2. servo motor; 21. transmission screw; 3. telescopic assembly; 31. cylinder sleeve; 32. transmission mechanism; 321. turntable; 322. connecting rod; 323. threaded rod; 324. first movable groove; 325. second movable groove; 33. telescopic rod; 331. first screw sleeve; 34. first sleeve; 341. second screw sleeve; 342. first connecting rod; 35. second sleeve; 351. third screw sleeve; 352. second connecting rod; 353. third movable groove; 36. threaded groove; 37. external thread; 38. guide; 381. spring; 39. guide groove. DETAILED DESCRIPTION

[0021] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0022] In order to solve the technical problems of the existing multi-stage telescopic structure being complex and large in size, such as Figure 1-Figure 6 As shown, the following preferred technical solutions are provided:

[0023] like Figure 1-Figure 4As shown, a heavy-duty CAN electric telescopic cylinder includes a base 1 and a servo motor 2 and a telescopic assembly 3 arranged on the top of the base 1. The base 1 includes a shell 11, and a transmission assembly is arranged inside the shell 11. The telescopic assembly 3 includes a cylinder sleeve 31 installed on one side of the top of the shell 11. A transmission mechanism 32 is rotatably arranged inside the cylinder sleeve 31. A telescopic rod 33, a first sleeve 34 and a second sleeve 35 are movably arranged outside the transmission mechanism 32 in sequence. The top and bottom of the telescopic rod 33, the first sleeve 34 and the second sleeve 35 are open and have a hollow inner cavity. The bottoms of the telescopic rod 33, the first sleeve 34 and the second sleeve 35 are respectively provided with a transmission mechanism 32. Corresponding to the first screw sleeve 331, the second screw sleeve 341 and the third screw sleeve 351, the first screw sleeve 331 and the second screw sleeve 341 are provided with external threads 37 on the outside, and the first sleeve 34 and the second sleeve 35 are provided with thread grooves 36 corresponding to the external threads 37 on the inside and above. The first sleeve 34 is provided with an opening on the top, and the opening size matches the outer wall size of the telescopic rod 33. The second sleeve 35 is provided with an opening on the top, and the opening size matches the outer wall size of the first sleeve 34. The inner cavity size of the second sleeve 35 is configured to allow the external threads 37 on the outside of the first sleeve 34 to move, and the inner cavity size of the first sleeve 34 is configured to allow the external threads 37 on the outside of the telescopic rod 33 to move.

[0024] like Figure 2 As shown, the transmission assembly inside the housing 11 includes a transmission gear 12, a worm wheel 13 and a worm 14 rotatably connected to the inside of the housing 11, wherein the transmission gear 12 is fixedly connected to the worm wheel 13, and the worm wheel 13 is meshingly connected to the worm 14; the output end of the servo motor 2 extends to the inside of the housing 11 and is fixedly connected with a transmission screw 21, and the transmission screw 21 is meshingly connected to the transmission gear 12, and the transmission screw 21 is driven by the servo motor 2 to rotate, thereby driving the transmission gear 12 to rotate, and the transmission gear 12 drives the worm wheel 13 to rotate, and then the transmission mechanism 32 is driven to rotate through the worm 14.

[0025] like Figure 5-Figure 6 As shown, the transmission mechanism 32 includes a turntable 321 fixedly connected to the worm 14, a connecting rod 322 is fixedly connected to the top of the turntable 321, a threaded rod 323 is fixedly connected to the top of the connecting rod 322, the threaded rod 323 corresponds to the first screw sleeve 331, the second screw sleeve 341 and the third screw sleeve 351, the diameter of the connecting rod 322 is smaller than the diameter of the threaded rod 323, the connecting rod 322 and the threaded rod 323 are configured as follows: when the telescopic assembly 3 is in a retracted state, the first screw sleeve 331 is threadedly connected to the threaded rod 323, and the second screw sleeve 341 and the third screw sleeve 351 are located outside the connecting rod 322.

[0026] Three groups of first connecting rods 342 are radially distributed at the bottom of the first sleeve 34, a third movable groove 353 is provided at the lower part of the interior of the second sleeve 35, and second movable grooves 325 corresponding to the first connecting rods 342 are radially distributed on the turntable 321. The first connecting rod 342 penetrates the third movable groove 353 and extends to the inside of the second movable groove 325. When the transmission mechanism 32 rotates, the telescopic rod 33 moves upward.

[0027] A second connecting rod 352 is radially distributed at the bottom of the second sleeve 35 , a third movable groove 353 corresponding to the second connecting rod 352 is radially distributed on the turntable 321 , and the third movable groove 353 extends to the inside of the first movable groove 324 , and the first connecting rod 342 is located outside the second movable groove 325 .

[0028] The transmission mechanism 32, the telescopic rod 33 and the first sleeve 34 are all provided with guide grooves 39 on the outside; a guide member 38 is radially distributed above the inside of the cylinder sleeve 31, and the guide member 38 is radially slidably connected to the inside of the cylinder sleeve 31, and a spring 381 is provided between the outer side of the guide member 38 and the inner wall of the cylinder sleeve 31; the guide member 38 corresponds to the guide groove 39, and the cross-sectional shape of the guide member 38 is a trapezoid.

[0029] How the extension process works:

[0030] The servo motor 2 is started to drive the transmission screw 21 to rotate, and the transmission mechanism 32 is driven to rotate through the transmission gear 12, the worm wheel 13 and the worm 14; when the transmission mechanism 32 rotates, the threaded rod 323 engages with the first screw sleeve 331 to drive the telescopic rod 33 to extend, and at this time, the guide member 38 is located in the guide groove 39 outside the telescopic rod 33 to limit it so that it can be extended smoothly; during the extension of the telescopic rod 33, since the first connecting rod 342 at the bottom of the first sleeve 34 and the third active groove 353 at the bottom of the second sleeve 35 are respectively located in the second active groove 325 and the first active groove 324, the first sleeve 3 4 and the second sleeve 35 are in a rotating state; when the telescopic rod 33 is extended to the point that the external thread 37 on the outside of the first screw sleeve 331 is close to the thread groove 36 on the upper part of the first sleeve 34, the telescopic rod 33 and the first sleeve 34 are threadedly connected; then the second screw sleeve 341 is threadedly connected with the threaded rod 323 from the outside of the connecting rod 322 upwards, at this time, the transmission mechanism 32 continues to rotate to drive the first sleeve 34 to extend, the first screw sleeve 331 is separated from the top of the threaded rod 323, and the telescopic rod 33 continues to move outward under the extension of the first sleeve 34; the transmission mechanism 32 then rotates to extend the second sleeve 35 as well.

[0031] How the retraction process works:

[0032] The servo motor 2 drives the transmission mechanism 32 to rotate in the opposite direction; the external guide groove 39 of the second sleeve 35 disengages from the guide member 38, and at the same time, the third screw sleeve 351 disengages from the threaded rod 323, and the second connecting rod 352 under the second sleeve 35 enters into the first movable groove 324, and the second sleeve 35 rotates accordingly and disengages from the first sleeve 34; during the disengagement process, the second screw sleeve 341 is threadedly connected to the threaded rod 323, and finally returns to the initial state as the telescopic rod 33 rotates.

[0033] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device.

[0034] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A heavy-duty CAN electric telescopic cylinder, comprising a base (1) and a servo motor (2) and a telescopic assembly (3) arranged on the top of the base (1), characterized in that: The base (1) comprises a shell (11), a transmission assembly is arranged inside the shell (11), the telescopic assembly (3) comprises a cylinder sleeve (31) mounted on one side of the top of the shell (11), a transmission mechanism (32) is rotatably arranged inside the cylinder sleeve (31), a telescopic rod (33), a first sleeve (34) and a second sleeve (35) are movably arranged outside the transmission mechanism (32) in sequence, the top and bottom of the telescopic rod (33), the first sleeve (34) and the second sleeve (35) are open, and A hollow inner cavity is provided, and the bottoms of the telescopic rod (33), the first sleeve (34) and the second sleeve (35) are respectively provided with a first screw sleeve (331), a second screw sleeve (341) and a third screw sleeve (351) corresponding to the transmission mechanism (32); the outsides of the first screw sleeve (331) and the second screw sleeve (341) are provided with external threads (37); and the upper parts of the insides of the first sleeve (34) and the second sleeve (35) are provided with thread grooves (36) corresponding to the external threads (37).

2. A heavy-duty CAN electric telescopic cylinder as claimed in claim 1, characterized in that: The transmission assembly inside the housing (11) comprises a transmission gear (12), a worm wheel (13) and a worm (14) rotatably connected inside the housing (11), wherein the transmission gear (12) is fixedly connected to the worm wheel (13), and the worm wheel (13) is meshingly connected to the worm (14).

3. A heavy-duty CAN electric telescopic cylinder as claimed in claim 2, characterized in that: The output end of the servo motor (2) extends to the interior of the housing (11) and is fixedly connected to a transmission screw (21), and the transmission screw (21) is meshingly connected with a transmission gear (12). The servo motor (2) drives the transmission screw (21) to rotate, thereby driving the transmission gear (12) to rotate, and the transmission gear (12) drives the worm wheel (13) to rotate, and then drives the transmission mechanism (32) to rotate through the worm (14).

4. A heavy-duty CAN electric telescopic cylinder as claimed in claim 3, characterized in that: The transmission mechanism (32) comprises a rotating disk (321) fixedly connected to the worm (14); a connecting rod (322) is fixedly connected to the top of the rotating disk (321); a threaded rod (323) is fixedly connected to the top of the connecting rod (322); the threaded rod (323) corresponds to a first screw sleeve (331), a second screw sleeve (341) and a third screw sleeve (351); the diameter of the connecting rod (322) is smaller than the diameter of the threaded rod (323); the connecting rod (322) and the threaded rod (323) are configured such that when the telescopic assembly (3) is in a retracted state, the first screw sleeve (331) is threadedly connected to the threaded rod (323); and the second screw sleeve (341) and the third screw sleeve (351) are located outside the connecting rod (322).

5. A heavy-duty CAN electric telescopic cylinder as claimed in claim 1, characterized in that: Three groups of first connecting rods (342) are radially distributed at the bottom of the first sleeve (34), a third movable groove (353) is provided at the lower part of the interior of the second sleeve (35), and second movable grooves (325) corresponding to the first connecting rods (342) are radially distributed on the rotating disk (321), the first connecting rod (342) passes through the third movable groove (353) and extends to the inside of the second movable groove (325), and when the transmission mechanism (32) rotates, the telescopic rod (33) moves upward.

6. A heavy-duty CAN electric telescopic cylinder as claimed in claim 1, characterized in that: A second connecting rod (352) is radially distributed at the bottom of the second sleeve (35), and a third movable groove (353) corresponding to the second connecting rod (352) is radially distributed on the turntable (321), and the third movable groove (353) extends to the inside of the first movable groove (324), and the first connecting rod (342) is located outside the second movable groove (325).

7. A heavy-duty CAN electric telescopic cylinder as claimed in claim 1, characterized in that: The transmission mechanism (32), the telescopic rod (33) and the first sleeve (34) are all provided with guide grooves (39) on their exteriors.

8. A heavy-duty CAN electric telescopic cylinder as claimed in claim 7, characterized in that: A guide member (38) is radially distributed above the interior of the cylinder sleeve (31), the guide member (38) is radially slidably connected to the interior of the cylinder sleeve (31), and a spring (381) is provided between the outer side of the guide member (38) and the inner wall of the cylinder sleeve (31).

9. A heavy-duty CAN electric telescopic cylinder as claimed in claim 8, characterized in that: The guide member (38) corresponds to the guide groove (39), and the cross-sectional shape of the guide member (38) is a trapezoid.

10. A heavy-duty CAN electric telescopic cylinder as claimed in claim 1, characterized in that: An opening is provided on the top of the first sleeve (34), and the size of the opening matches the size of the outer wall of the telescopic rod (33). An opening is provided on the top of the second sleeve (35), and the size of the opening matches the size of the outer wall of the first sleeve (34). The inner cavity size of the second sleeve (35) is configured to allow the external thread (37) on the outside of the first sleeve (34) to move, and the inner cavity size of the first sleeve (34) is configured to allow the external thread (37) on the outside of the telescopic rod (33) to move.

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