Multi-stage electric telescopic rod

Abstract

The utility model discloses a multi-stage electric telescopic rod, which realizes that a first-stage screw rod drives a multi-stage nut for transmission, the length of an n-stage telescopic rod when the n-stage telescopic rod extends out is close to n times of the length of the n-stage telescopic rod when the n-stage telescopic rod retracts, the n-stage telescopic rod can stop at any position in the middle, the available stroke is large, only one-stage screw rod is arranged, and each stage is made of light materials, so that the whole weight is light, the size is small, and the operation is convenient. The number of stages can be increased or decreased according to design and use requirements, a guiding piece guiding mode is adopted, smooth transition of the meshing and separating process of the lead screw nut is achieved, hook locks are adopted for locking between the second stage to the (n-1) th stage and the upper stage, all stages of rods sequentially stretch out, and the situation that the lower stage is driven to stretch out when the upper stage does not stretch in place is avoided. And the top end pieces of the first-stage rod to the (n-1) th-stage rod are also made of wear-resistant materials, are fully lubricated and are tightly attached to the outer wall of the next-stage rod, so that the whole telescopic rod can bear large radial load and small shaking and deformation.

Description

Technical Field

[0001] This utility model relates to the field of electric telescopic pole technology, specifically a multi-stage electric telescopic pole. Background Technology

[0002] Existing multi-stage telescopic mechanisms are generally classified according to their driving method as follows:

[0003] 1. Purely manual: There is generally no mechanical linkage between each level, and the relative extension and locking limit of each level requires manual operation.

[0004] 2. Electric type: Generally, it has 2 or 3 levels of telescopic movement. The multi-level telescopic movement is achieved by a mechanism such as a screw nut, gear rack, sprocket chain or pulley rope group. The mechanism is driven by a motor during operation.

[0005] Hydraulic type: During operation, hydraulic oil is pumped into / out of the hydraulic cylinder by a high-pressure oil pump to achieve extension and retraction. Synchronization / linkage between stages is achieved by mechanisms such as sprockets, chains, pulleys, and ropes, or locking between the cylinder and each stage is achieved by structures such as hydraulic pins.

[0006] Problems with existing multi-stage telescopic mechanisms: 1. Purely manual: Since each stage of extension and retraction requires manual operation and there is no linkage between stages, the entire process is very laborious, lengthy, and cumbersome. Furthermore, there are generally only two limit points between each stage: fully extended and fully retracted, making it difficult to adjust the extension length as needed.

[0007] Electric type: The telescopic system generally has no more than three stages, each driven by a relatively complex mechanism such as a lead screw and nut, gears and racks, sprockets and chains, or pulleys and ropes. It typically has a large retraction length, short total effective stroke, complex structure, high cost, insufficient reliability, and weak radial load capacity.

[0008] Hydraulic type: requires a complete hydraulic system, has a complex structure, high cost, large size, and is bulky, which cannot meet most daily use needs.

[0009] Therefore, a multi-stage electric telescopic pole is proposed. Utility Model Content

[0010] The purpose of this invention is to provide a multi-stage electric telescopic pole to solve the problems mentioned in the background art.

[0011] To achieve the above objectives, this utility model provides the following technical solution: a multi-stage electric telescopic rod, including a fixed base, on which a first-stage rod is fixedly installed. Second-stage rods (n-1) are slidably installed on the inner wall of the first-stage rod, where n is a natural number. A rod top end piece is installed on the top side of each of the first-stage rods (n-1), and a rod bottom end piece is installed on the bottom side of each of the second-stage rods (n-1). A nut is fixedly installed on the bottom side of the rod bottom end piece, and a guide piece is fixedly installed on the bottom side of the nut. A frustum-shaped hole is formed on the bottom side of the guide piece, and the bottom diameter is larger than the top diameter. A reciprocating screw is rotatably installed inside the fixed base via a bearing. A section of the reciprocating screw near the fixed base is smoothly arranged. The nuts on the second-stage rods (n-1) are all screwed onto the reciprocating screw. The inner wall of the guide piece is in contact with the top end of the reciprocating screw.

[0012] Preferably, a reduction housing is fixedly installed on the bottom side of the fixed base, and a transmission gear is rotatably installed on the inner walls of both sides of the reduction housing via bearings. A driven gear meshes on one side of the transmission gear, and the driven gear is sleeved on the bottom side of the reciprocating screw. The bottom end of the reciprocating screw is rotatably installed on the bottom inner wall of 12 via bearings.

[0013] Preferably, a servo motor is fixedly mounted on one side of the deceleration housing by bolts, and the bottom end of the output shaft of the servo motor is mounted on the bottom inner wall of the deceleration housing by a bearing. A drive gear is sleeved on the output shaft of the servo motor, and the drive gear meshes with the transmission gear.

[0014] Preferably, a pin hook lock is slidably installed on each of the multiple rod top parts. The pin hook lock is in the shape of a horizontal L. A right-angled trapezoidal protrusion is fixedly installed on the top side of each rod top part of the first-n-2th stage rod. The hook end of the pin hook lock is in contact with the protruding end of the right-angled trapezoidal protrusion.

[0015] Preferably, the upper ends of the plurality of pin hook locks are slidably mounted on the top end member of the rod on the second-n-1 level rod, and the upper ends of the plurality of bottom end members are provided with inclined surfaces, the inclined surfaces of the bottom end members being in contact with the smooth end of the pin hook lock.

[0016] Preferably, a pin spring is fixedly installed on the top end of the rod, and the other end of the pin spring is fixedly installed on one side of the pin hook lock.

[0017] Compared with the prior art, the beneficial effects of this utility model are:

[0018] (1) This utility model realizes the transmission of multiple nuts driven by a single screw. When the n-stage telescopic rod extends, its length is close to n times when it retracts. It can stop at any position in the middle, has a large usable stroke, and only has a single screw. All stages are made of lightweight materials, so the overall weight is light and the volume is small. The number of stages can be increased or decreased according to the design and usage requirements.

[0019] (2) In this utility model, the lead screw and the nuts of each stage are driven by a guide to achieve a smooth transition in the engagement and disengagement process of the lead screw and nuts;

[0020] (3) In this utility model, the second to n-1th levels are locked with the previous level by hook lock, so that the rods of each level extend in sequence, avoiding the situation where the previous level does not extend to the full extent and causes the next level to extend.

[0021] (4) In this utility model, the second to n-1th levels are locked with the next level by a spring pin locking method, which realizes a firm lock after each level of rod extends, avoiding the problem of disengagement under axial load in other fastening methods;

[0022] (5) In this utility model, the bottom parts of the second to nth level rods are all made of wear-resistant material, which is fully lubricated and closely attached to the inner wall of the previous level rod. The top parts of the first to n-1 level rods are also made of wear-resistant material, which is fully lubricated and closely attached to the outer wall of the next level rod, so that the overall telescopic rod can withstand large radial loads and has small shaking and deformation. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of the main structure of this utility model;

[0024] Figure 2 This is a schematic diagram of the extended structure of this utility model;

[0025] Figure 3 This is a schematic diagram of the internal structure of the present invention;

[0026] Figure 4 This is a cross-sectional structural diagram of the fixed base, the first-stage rod, and the deceleration housing of this utility model;

[0027] Figure 5 This is a cross-sectional structural diagram of the first-stage rod, the second-stage rod, and the reciprocating lead screw of this utility model;

[0028] Figure 6 For the present utility model Figure 5 A magnified structural diagram of part A in the middle;

[0029] Figure 7 This is a schematic diagram of the connection structure of the servo motor, the reduction housing, and the reciprocating lead screw of this utility model.

[0030] Figure 8 This is a schematic diagram of the connection structure of the rod top part, the pin hook lock, and the right-angled trapezoidal protrusion of this utility model;

[0031] Figure 9 This is a schematic diagram of the connection structure of the reciprocating lead screw, the bottom end piece, and the guide piece of this utility model;

[0032] Figure 10 This is a cross-sectional structural diagram of the first-stage rod, the second-stage rod, and the bottom end member of the rod according to this utility model;

[0033] Figure 11 This is a schematic diagram of the separation structure of the pin hook lock and the right-angled trapezoidal protrusion of this utility model.

[0034] In the diagram: 1. Fixed base; 2. First-stage rod; 3. Second-stage rod; 4. Reciprocating lead screw; 5. Bottom part of the rod; 6. Nut; 7. Guide part; 8. Top part of the rod; 9. Pin hook lock; 10. Right-angled trapezoidal protrusion; 11. Pin spring; 12. Reduction housing; 13. Servo motor; 14. Drive gear; 15. Transmission gear; 16. Driven gear. Detailed Implementation

[0035] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0036] Example: Please refer to Figure 1-11This utility model provides a technical solution: a multi-stage electric telescopic rod, including a fixed base 1, on which a first-stage rod 2 is fixedly installed. Second-stage rods 3-n, where n is a natural number, are slidably installed on the inner wall of the first-stage rod 2. A rod top piece 8 is installed on the top side of each of the first-stage rods 2 to n-1. A rod bottom piece 5 is installed on the bottom side of each of the second-stage rods 3-n. A nut 6 is fixedly installed on the bottom side of the rod bottom piece 5. A guide piece 7 is fixedly installed on the bottom side of the nut 6. The guide piece 7 has a frustum-shaped hole on its bottom side, and its bottom diameter is larger than its top diameter. A reciprocating screw 4 is rotatably mounted inside the fixed base 1 via a bearing. A section of the reciprocating screw 4 near the fixed base 1 is smoothly mounted. Nuts 6 on the second-stage rods 3-n are all screwed onto the reciprocating screw 4. The inner wall of the guide 7 contacts the top of the reciprocating screw 4. A reduction housing 12 is fixedly installed on the bottom side of the fixed base 1. Transmission gears 15 are rotatably installed on the inner walls of both sides of the reduction housing 12 via bearings. A driven gear 16 meshes on one side of the transmission gear 15. The driven gear 16 is sleeved on the bottom side of the reciprocating screw 4. The bottom end of the reciprocating screw 4 is rotatably installed on the bottom inner wall of the reduction housing 12 via bearings. A servo motor 13 is fixedly installed on one side of the reduction housing 12 by bolts. The bottom end of the output shaft of the servo motor 13 is installed on the bottom inner wall of the reduction housing 12 via bearings. A drive motor is sleeved on the output shaft of the servo motor 13. Gear 14, drive gear 14 meshes with transmission gear 15. Multiple rod end pieces 8 are slidably mounted with pin hook locks 9, which are L-shaped. Right-angled trapezoidal protrusions 10 are fixedly mounted on the top side of the rod end pieces 8 of the first-stage rods 2-n-2. The hook end of the pin hook lock 9 contacts the protruding end of the right-angled trapezoidal protrusion 10. The upper ends of the multiple pin hook locks 9 are slidably mounted on the rod end pieces 8 of the second-stage rods 3-n-1. Multiple rod bottom pieces 5 have inclined surfaces at their upper ends, which contact the smooth end of the pin hook lock 9. A pin spring 11 is fixedly mounted on the rod end piece 8, and the other end of the pin spring 11 is fixedly mounted on one side of the pin hook lock 9. The extension of this application... The retraction rod has n stages (n≥2), and the number of stages can be added or removed arbitrarily. It drives multiple nuts 6 through a single reciprocating screw 4, which reduces weight, reduces volume, shortens the minimum retraction distance, increases the effective stroke, and makes the structure simpler and more reliable. The first stage rod 2 is installed with the fixed base 1. The servo motor 13 and the speed change gear set are located in the reduction housing 12. The first stage rod 2 has a reciprocating screw 4. The servo motor 13 and the speed change gear set drive the reciprocating screw 4 to achieve forward and reverse rotation. The lower part of the reciprocating screw 4 near the fixed base 1 is a cylindrical optical shaft. The first stage rods 2 to n stages are made of lightweight polygonal tubes (aluminum alloy, carbon fiber or high-strength engineering plastic). Starting from the second stage rod 3, each stage rod is equipped with a rod bottom part 5 and a nut 6 at the lower end.The rod bottom part 5 is made of lightweight, high-strength, and wear-resistant material. It is rigidly connected to the polygonal tube and fits tightly against the inner wall of the upper-level polygonal tube under sufficient lubrication. It ensures sufficient radial support during movement to reduce swaying. At the same time, the nut 6 is also rigidly connected to the rod bottom part 5. From the 3rd level rod to the nth level rod (n>3), in addition to the rod bottom part 5 and the nut 6, a bottom guide part 7 is added and rigidly connected to the nut 6. The bottom guide part 7 is used for centering guidance when the rod retracts and contacts the reciprocating screw 4, preventing the reciprocating screw 4 from being eccentric and unable to properly mesh with the nut 6, which would cause the rod to get stuck during the retraction stroke. When the telescopic rod is in two stages, no guide component is required. The nut 6 and the bottom part 5 of the rod can be combined into one component to achieve the relevant functions. The upper end of each stage of the rod is equipped with a top part 8, which provides axial movement limit and radial support for the next stage of the rod. There is no relative rotation between the stages of the rod. The top part 8 of the first stage 2 has upper and lower limit switches inside to detect whether the telescopic rod has reached the limit position (fully extended or fully retracted). The top parts 8 of the second stage 3 to the (n-1)th stage are equipped with pin hook locks 9. The top part 11 of the nth stage has a functional connection port and a lower limit switch triggering device. At the same time, the gear set inside the deceleration housing 12 can be changed to three sets or two sets according to the actual use environment, and the servo motor 13 is directly installed on the bottom end of the reciprocating screw 4.

[0037] The working principle is as follows: In the initial state, the multi-stage telescopic rod is in the fully retracted state, and each stage is in the retracted position. Only the nth stage nut 6 is engaged with the reciprocating screw 4. The nuts 6 of other stages are located at the cylindrical optical axis section of the reciprocating screw 4 and are not engaged with the reciprocating screw 4. The pin hook lock 9 located at the top part 8 of the second stage rod 3 to the (n-1)th stage rod is in the state of hooking the right-angled trapezoidal protrusion 10 on the top of the previous stage rod under the action of the pin spring 11, so as to realize the relative locking of the second stage rod 3 to the (n-1)th stage relative to the previous stage.

[0038] When the telescopic rod extends, the nth stage rod extends first under the transmission of the reciprocating screw 4 and nut 6. When the bottom part 5 of the nth stage rod reaches the vicinity of the top part 8 of the (n-1)th stage rod, the upper edge of the inclined surface of the bottom part 5 of the nth stage rod contacts the pin locking hook 9 device inside the top part 8 of the (n-1)th stage rod. As the nth stage rod continues to extend, the radial component of the support force from the upper edge of the inclined surface of the bottom part 5 of the nth stage rod pushes the pin locking hook 9 of the (n-1)th stage rod to slide radially, compressing the pin spring 11 and disengaging from the lower edge of the right-angled trapezoidal protrusion 10 at the top of the top part 8 of the (n-2)th stage rod. After unlocking from the (n-2)th stage, the upper edge of the inclined surface of the bottom part 5 of the nth stage rod continues to push the pin locking hook 9 of the (n-1)th stage rod to compress the pin spring 11 and move radially to the limit position. At the same time, the axial component of the support force from the inclined surface of the bottom part 5 pushes the locking hook 9 to slightly extend the (n-1)th stage rod and enter the locking preparation state. The upper edge of the inclined surface of the bottom part 5 of the n-stage rod is released from contact with the lower edge of the pin of the (n-1)-stage rod. The n-stage rod continues to extend and generates axial relative movement with the locking hook 9 of the (n-1)-stage rod until the pin hole of the bottom part 5 of the n-stage rod is fully aligned with the pin of the (n-1)-stage rod. At this time, the compressed pin spring 11 is released and pushes the pin into the pin hole of the bottom part 5 of the rod. As the n-stage continues to extend, the pin is fully inserted, completing the locking of the (n-1)-stage relative to the n-stage. Then, the (n-1)-stage extends synchronously with the n-stage until the nut 6 of the (n-1)-stage is fully engaged with the reciprocating screw 4. The n-stage disengages from the reciprocating screw 4 and extends synchronously with the (n-1)-stage under the drive of the pin. Subsequently, the (n-1)-stage continues to drive, and the extension of the (n-2)-stage to the 2nd stage is completed in sequence according to the above process until the bottom part 5 of the 2nd-stage rod contacts the contact limit switch located in the top part 8 of the 1st-stage rod, completing the extension stroke.

[0039] The telescopic rod retraction stroke is opposite to the extension stroke. The second-stage rod 3 starts to retract first. When the top of the reciprocating screw 4 is fully engaged with the third-stage nut under the action of the guide 7, the second-stage nut reaches the cylindrical shaft section of the reciprocating screw 4 and disengages under the continuous retraction of the third stage. The third-stage rod continues to drive the second-stage rod 3 downward. The bottom inclined surface of the pin hook lock 9 at the top of the second-stage rod 3 contacts the upper edge of the right-angled trapezoidal protrusion 10 at the top of the first-stage rod 2. As the third stage continues to retract, the radial component of the support force from the upper edge of the right-angled trapezoidal protrusion 10 at the top of the first-stage rod 2 pushes the pin hook lock 9 of the second-stage rod 3 to slide radially and compress the pin spring 11. The bottom slope of the pin hook lock 9 slides obliquely downward along the upper edge of the right-angled trapezoidal protrusion at the top of the first-stage rod 2. At this time, the upper slope of the pin hole of the bottom part of the third-stage rod contacts the upper edge of the pin. As the retraction continues, the axial component of the support force generated by the upper slope of the pin hole of the bottom part of the third-stage rod pushes the pin hook lock and the second stage to continue to retract until the upper edge of the bottom barb of the hook lock is completely sunk below the lower edge of the right-angled trapezoidal protrusion 10 at the top of the first-stage rod 2. At the same time, the radial component of the support force pushes the pin to slide further radially to the limit position and causes the upper edge of the pin to release contact with the upper slope of the pin hole, realizing the separation of the second and third stages. The pin spring 11 is further compressed. At this point, as the third stage continues to retract, the pin spring 11 gradually releases and pushes the bottom hook of the pin hook lock 9 into the lower edge of the right-angled trapezoidal protrusion 10 at the top of the first-stage rod 2, completing the locking of the second stage relative to the first stage. The third stage then continues to retract, sequentially driving the next stage in the same order, until the top component of the nth stage triggers the contact limit switch in the top component of the first-stage rod, completing the retraction stroke.

[0040] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A multi-stage electric telescopic pole, characterized in that: Includes a fixed base (1), on which a first-stage rod (2) is fixedly installed. A second-stage rod (3) to n-stage rods are slidably installed on the inner wall of the first-stage rod (2), where n is a natural number. A rod top end piece (8) is installed on the top side of each of the first-stage rods (2) to n-1. A rod bottom end piece (5) is installed on the bottom side of each of the second-stage rods (3) to n-stage rods. A nut (6) is fixedly installed on the bottom side of the rod bottom end piece (5). A guide piece (7) is fixedly installed on the bottom side of the nut (6). A frustum hole is opened on the bottom side of the guide piece (7), and the bottom diameter is larger than the top diameter. A reciprocating screw (4) is rotatably installed inside the fixed base (1) via a bearing. A section of the reciprocating screw (4) near the fixed base (1) is smoothly arranged. The second-stage rod (3) to n-stage rods... The nuts (6) on the n-stage rod are all screwed onto the reciprocating screw (4), and the inner wall of the guide (7) is in contact with the top end of the reciprocating screw (4).

2. The multi-stage electric telescopic pole according to claim 1, characterized in that: A reduction housing (12) is fixedly installed on the bottom side of the fixed base (1). A transmission gear (15) is rotatably installed on the inner walls of both sides of the reduction housing (12) via bearings. A driven gear (16) meshes on one side of the transmission gear (15). The driven gear (16) is sleeved on the bottom side of the reciprocating screw (4). The bottom end of the reciprocating screw (4) is rotatably installed on the inner wall of the bottom side of 12 via bearings.

3. A multi-stage electric telescopic pole according to claim 2, characterized in that: A servo motor (13) is fixedly installed on one side of the deceleration housing (12) by bolts. The bottom end of the output shaft of the servo motor (13) is mounted on the bottom inner wall of the deceleration housing (12) by bearing. A drive gear (14) is sleeved on the output shaft of the servo motor (13), and the drive gear (14) meshes with the transmission gear (15).

4. A multi-stage electric telescopic pole according to claim 1, characterized in that: Each of the multiple rod end pieces (8) is slidably fitted with a pin hook lock (9), the pin hook lock (9) being L-shaped, the first-stage rod (2)-n- The top side of the top part (8) of the second-level rod is fixedly installed with a right-angled trapezoidal protrusion (10), and the hook end of the pin hook lock (9) is in contact with the protrusion end of the right-angled trapezoidal protrusion (10).

5. A multi-stage electric telescopic pole according to claim 4, characterized in that: The upper ends of the plurality of pin hook locks (9) are respectively slidably mounted on the second-stage rod (3)-n- On the top part (8) of the first-level rod, the upper ends of the multiple bottom parts (5) are provided with inclined surfaces, and the inclined surfaces of the bottom parts (5) are in contact with the smooth end of the pin hook lock (9).

6. A multi-stage electric telescopic pole according to claim 4, characterized in that: A pin spring (11) is fixedly installed on the top part (8) of the rod, and the other end of the pin spring (11) is fixedly installed on one side of the pin hook lock (9).

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