Segmented push rod device using plastic nut and processing method thereof

Abstract

The present invention relates to a segmented push rod device using a plastic nut, comprising an input shaft, an upper shell, a lower shell, a transmission device, a screw, a plastic nut and a metal tube. The plastic nut is a segmented plastic nut structure, which is composed of at least two or more segmented plastic nuts, with separation gaps between adjacent segmented plastic nuts, and at least two or more segmented plastic nuts of the segmented plastic nut structure are simultaneously fixedly connected to one end of the metal tube using threads, pins, screws or retaining springs. The segmented plastic nut structure used in the present invention has good self-lubricating properties and does not require frequent refueling. It can also withstand harsh temperature environments with large temperature differences and heavy loads without axial expansion. It is particularly suitable for push rod devices of solar power generation tracking brackets, as well as scientific experiments, deserts or cold and tropical environments. The present invention also relates to a processing method for a segmented push rod device using a plastic nut.

Description

Technical Field

[0001] The present invention belongs to the technical field of push rod devices, and specifically relates to a segmented push rod device using a plastic nut and a processing method thereof, in particular a push rod device and a processing method thereof suitable for a solar power generation sun tracking bracket. Background Art

[0002] The technology of using solar power generation devices to generate electricity is becoming more and more common around the world. In order to maximize the utilization of solar energy by solar power generation devices, existing technologies use solar tracking brackets to achieve the lifting and / or angle adjustment of solar panels in solar power generation devices to follow the different spatial angles of the sun, and the lifting and / or angle adjustment functions of the solar tracking brackets are all achieved by using push rod devices. Since solar power generation devices are used in harsh outdoor environments, they usually need to withstand ambient temperatures of -30℃ to 70℃ to operate, and solar power generation devices need to operate in strong winds. The wind force on the solar power generation devices is relatively large, so this places strict requirements on the use of push rod devices, requiring each set of push rod devices to be able to withstand a static load of no less than 3 tons and a dynamic load of no less than 1 ton.

[0003] To ensure that the solar tracking bracket can operate normally in an ambient temperature range of -30°C to 70°C, withstand a static load of no less than 3 tons and a dynamic load of no less than 1 ton, and have a service life of no less than 5,000 hours, the push rod device that enables the lifting and / or angle adjustment functions of the solar tracking bracket is designed to have a service life of more than 10,000 cycles of lifting and / or angle adjustment. The lead screw and nut play a crucial role in this. To reduce wear on the lead screw and nut during reciprocating spiral motion, the lead screw is typically made of metal, while the nut is more commonly made of copper or plastic.

[0004] Copper nuts offer the following advantages: 1. They are used in harsh environments with large temperature fluctuations, demonstrating their high strength and ability to withstand heavy static and dynamic loads. 2. Their low coefficient of linear expansion prevents axial stiffness from occurring as the ambient temperature rises and falls. However, copper nuts have a disadvantage: their self-lubricating properties are poor in these harsh environments. For example, if a copper nut is lifted a meter under a dynamic load of 1 ton, the number of lifts is less than 150, requiring frequent greasing to ensure smooth movement during the screw drive. If the number of lifts reaches approximately 200 without greasing, the screw will completely wear out the copper nut, rendering the entire actuator inoperable. A typical solar farm has thousands of actuators, and regular greasing requires significant cost, labor, and resources.

[0005] The advantages of plastic nuts include excellent self-lubrication, requiring only a single application of grease for lubrication throughout their lifecycle, ensuring smooth screw transmission with the screw without the need for frequent lubrication. However, plastic nuts have the following disadvantages: Due to their poor strength, they cannot withstand large static and dynamic loads. If the length of a single nut is increased to achieve these loads, axial expansion can occur due to the plastic's high linear expansion coefficient when used in harsh environments with large temperature fluctuations.

[0006] Therefore, how to utilize the advantages of the push rod device using a plastic nut, which has good self-lubricating properties and does not require frequent refueling, and solve the problem that the push rod device using a plastic nut will cause axial expansion and death under the drive of the screw rod in a harsh temperature environment with large temperature changes and under a large load, has been a technical problem that technical personnel in this field have been unable to solve for a long time. Summary of the Invention

[0007] The first object of the present invention is to provide a segmented push rod device using a plastic nut which has good self-lubricating performance and does not require frequent refueling, and can withstand harsh temperature environments with large temperature differences and heavy loads without axial expansion.

[0008] The second object of the present invention is to provide a processing method for a segmented push rod device using a plastic nut, which has good self-lubricating performance and does not require frequent refueling, and can withstand harsh temperature environments with large temperature differences and large loads without axial expansion.

[0009] In order to solve the above problems, the technical solution for achieving the first purpose of the present invention is a segmented push rod device using a plastic nut, comprising an input shaft, an upper shell, a lower shell, a transmission device, a screw, a plastic nut and a metal tube, the upper shell and the lower shell are fixedly connected to form a reduction box and form a space for accommodating the transmission device, the transmission device is a gear transmission mechanism or a worm gear transmission mechanism, the input shaft has an exposed end located outside the reduction box, and an inserted end located inside the reduction box, the inserted end of the input shaft is a gear shaft or a worm, and the gear shaft or worm at the input inserted end is respectively meshed with the first-stage gear or worm wheel of the transmission device, the final-stage gear or worm wheel of the transmission device is fixedly connected to the screw or made into one piece, driving the screw to rotate, the plastic nut is spirally installed on the screw, and one end of the metal tube is fixedly connected to the outer periphery of the plastic nut, and when the screw rotates, the plastic nut is driven to perform reciprocating linear motion on the screw; its improvement is:

[0010] a. The plastic nut is a segmented plastic nut structure, which is composed of at least two or more segmented plastic nuts D1, D2, ..., D n Combination, wherein n≥2, and n is a positive integer, the adjacent segmented plastic nuts D1, D2, ..., D n There is a separation gap between them, and at least two or more segments of the segmented plastic nut structure are segmented plastic nuts D1, D2, ..., D n At the same time, it is fixedly connected to one end of the metal tube;

[0011] b. The segmented plastic nuts D1, D2, ..., D n The length of each segment L1, L2, ..., L n All are between 5 and 80 mm.

[0012] Furthermore, at least two or more segments of the segmented plastic nuts of the segmented plastic nut structure are simultaneously fixedly connected to one end of the metal tube by threads; or fixedly connected by a retaining spring; or at least two or more segments of the segmented plastic nuts of the segmented plastic nut structure are simultaneously fixedly connected to one end of the metal tube by pins and / or screws; or some of the at least two or more segments of the segmented plastic nuts of the segmented plastic nut structure are fixedly connected to one end of the metal tube by pins and / or screws while the remaining segmented plastic nuts are fixedly connected to one end of the metal tube by threads.

[0013] Furthermore, at least two or more segments of the segmented plastic nut structure are simultaneously fixedly connected to the clamping spring at one end of the metal tube, and both ends of each segmented plastic nut are provided with a clamping spring, which is clamped in the clamping spring groove provided on the inner wall of the metal tube. One end of the first segmented plastic nut is against the first clamping spring, and a separation gap δ1 is provided between the other end and the second clamping spring. One end of the second segmented plastic nut is against the second clamping spring, and a separation gap δ2 is provided between the other end and the third clamping spring. One end of the nth segmented plastic nut is against the nth clamping spring, and a separation gap δ is provided between the other end and the n+1th clamping spring. n The length of each segment of the segmented plastic nut after the plastic nut is segmented is L1, L2, ..., L n The distance between the retaining ring grooves is greater than that between the segmented plastic nuts D1, D2, ..., D n The length of the segmented plastic nut and the retaining spring is δ1, δ2, ..., δ n All are greater than 0.05mm.

[0014] Furthermore, the length of each segment of the segmented plastic nut is L1, L2, ..., L n The spacings between adjacent segmented plastic nuts are C1, C2, ..., C n All are greater than 0.05mm.

[0015] Furthermore, the major diameter Φ2 of the external thread of the screw rod is between 15 and 35 mm, and the outer diameter Φ4 of the plastic nut matched therewith is between 30 and 50 mm.

[0016] Furthermore, it also has a drive motor, which is fixedly connected to the lower shell body, and the drive shaft of the drive motor is the input shaft of the reduction gear box body. The outer end surface of the motor end cover of the drive motor has an integrally formed annular boss, and the input shaft of the drive motor is equipped with a cap. The shape of the center hole of the cap is consistent with the cross-sectional shape of the corresponding mating part of the input shaft, and the cap has a groove that matches the annular boss of the motor end cover. The cap and the annular boss of the motor end cover form a labyrinth oil-blocking structure.

[0017] Furthermore, the reduction gear box body is provided with a shell mounting head or a metal dustproof tube with a shell mounting head, and the other end of the metal tube is provided with a tube wall connecting hole or is fixedly connected to the metal tube mounting head.

[0018] Furthermore, the reduction gear box body is fixedly connected to a shell mounting head, the other end of the metal tube is fixedly connected to a metal tube mounting head, and the metal tube mounting head and the shell mounting head are respectively located on both sides of the reduction gear box body, and the transmission device is a three-stage gear transmission mechanism or a one-stage worm gear transmission mechanism.

[0019] Furthermore, in the plastic nut, the helix angle Ψ of the internal thread of any segmented plastic nut is ≤2.90°, and the screw rod has an external thread that matches the helix angle Ψ of the internal thread of the segmented plastic nut.

[0020] In order to solve the above problem, the first technical solution for achieving the second object of the present invention is a method for processing a segmented push rod device, wherein the improvement is as follows: the processing steps of simultaneously threading and fixing at least two or more segmented plastic nuts of the segmented plastic nut structure in the segmented push rod device using plastic nuts to one end of the metal pipe are as follows:

[0021] Step 1: Take the blanks of each segmented plastic nut of the plastic nut that have been processed with external threads but not yet processed with internal threads, apply adhesive on the external threads of each of the blanks and the internal threads of the metal tube, wherein the adhesive adhesive is thread fastening adhesive, and the length of each segment of the segmented plastic nut is between 5 and 80 mm;

[0022] Step 2: Rotate and install the first segmented plastic nut into the metal tube, and ensure that the first segmented plastic nut can reach the deepest screwing position set by the metal tube;

[0023] Step 3: Rotate the second segmented plastic nut in the metal tube until it touches the first segmented plastic nut, and then rotate the second segmented plastic nut in the opposite direction within a range of 10 to 180 degrees to create a separation gap between the second segmented plastic nut and the first segmented plastic nut;

[0024] Step 4: Repeat the above steps until the n-1 segmented plastic nut D is completed. n-1 Installation;

[0025] Step 5: After rotating the nth segmented plastic nut in the metal tube until it touches the n-1th segmented plastic nut, rotate the nth segmented plastic nut in the opposite direction within a rotation range of 10 to 180 degrees, so that a separation gap is generated between the nth segmented plastic nut and the n-1th segmented plastic nut.

[0026] Step 6: After the adhesive solidifies, internal threads are uniformly processed on the blank segments of all segmented plastic nuts of the plastic nut to form segmented plastic nuts that are simultaneously threadedly fixedly connected to one end of the metal tube. The processing work of threadedly fixing the segmented plastic nut to one end of the metal tube is completed.

[0027] In order to solve the above problem, the second technical solution for achieving the second purpose of the present invention is a method for processing a segmented push rod device, wherein the improvement is that at least two or more segmented plastic nuts D1, D2, ..., D n At the same time, the processing steps for fixing the connection with the clamping spring at one end of the metal tube are as follows:

[0028] Step 1: Processing n+1 retaining ring grooves with a spacing of 7 to 82 mm on the inner wall of one end of the metal tube;

[0029] Step 2: Processing n segments of segmented plastic nuts D1, D2, D3, D with a length between 5 and 80 mm and less than the spacing distance between the corresponding retaining ring grooves, and the outer diameter of the blank segment is equal to the inner diameter of the metal tube, and the spacing distance between each retaining ring groove is greater than the length of the blank segment of each segmented plastic nut D1, D2, D3, D, and the difference between the two is the separation gap (δ1, δ2, ..., δ n ), each of the separation gaps δ1, δ2, ..., δ n All are greater than 0.05mm;

[0030] Step 3: After using circlip pliers to install the first circlip K1 into the deepest first circlip groove in the metal tube, install the first section of the first segmented plastic nut D1 blank with adhesive applied to its outer circumference into the metal tube 800, which has also been coated with adhesive, so that one end of the first segmented plastic nut D1 blank touches the first circlip K1. Then, use circlip pliers to install the second circlip K2 into the second circlip groove in the metal tube. At this time, a separation gap δ1 is formed between the other end of the first segmented plastic nut D1 blank and the second circlip K2.

[0031] Step 4: Install a second segmented plastic nut D2 blank with adhesive applied to its outer circumference into the metal tube already coated with adhesive, and make one end of the second segmented plastic nut D2 blank touch the second circlip K2. Then, use circlip pliers to install the third circlip K3 into the third circlip groove in the metal tube. At this time, a separation gap δ2 is formed between the other end of the second segmented plastic nut D2 blank and the third circlip K3.

[0032] Step 5: Repeat the above steps until the nth segment plastic nut D with adhesive is coated on the outer circle. nThe blank section is loaded into the metal tube coated with adhesive and the nth segment plastic nut D is fixed. n One end of the blank section touches the nth retaining ring K n Then use the circlip pliers to fix the n+1 circlip K n+1 Insert the n+1th circlip groove in the metal tube. At this time, the nth segmented plastic nut D n The other end of the blank segment is connected to the n+1th circlip K n+1 A separation gap δ is formed between n ;

[0033] Step 6: After the adhesive is cured, clamp the outer circle of the metal tube and uniformly process the segmented plastic nuts D1, D2, ..., D n The internal thread of the segmented plastic nut structure comprises at least two or more segmented plastic nuts D1, D2, ..., D n At the same time, the processing of fixed connection with the clamping spring at one end of the metal pipe is completed.

[0034] The present invention has the following beneficial effects: the segmented push rod device using a plastic nut has excellent self-lubricating properties and does not require frequent greasing, allowing it to smoothly move with the screw during the screw transmission process without the need for re-lubrication throughout its entire life cycle. Furthermore, by using two or more segmented plastic nuts and leaving sufficient expansion gaps between each segmented plastic nut, the overall length of the plastic nut is lengthened, improving its ability to withstand large static and dynamic loads. Furthermore, because the overall length of the plastic nut is shortened due to segmentation, the length of each segmented plastic nut is shortened, thereby reducing the deformation of each segmented nut in harsh temperature environments with large temperature differences. This significantly reduces the length deformation of each segmented plastic nut, minimizing the length deformation of each segmented plastic nut. Even when the plastic nut is used in harsh temperature environments between -30°C and 70°C, axial expansion between the plastic nut and the screw will not occur. The present invention is particularly suitable for use in push rod devices for solar power generation tracking brackets operating in harsh temperature environments with large temperature differences and under heavy loads. Since plastic nuts are used instead of copper nuts, production costs can be greatly reduced and efficiency can be improved. In particular, the present invention can adapt to large-scale production, meet market demand to the greatest extent, and multiply the benefits of enterprises, while generating great social and economic benefits.

[0035] The processing method of the segmented push rod device using plastic nuts provided by the present invention, the produced segmented push rod device using plastic nuts, not only has good self-lubricating performance and does not require frequent refueling, but also can not axially swell in harsh temperature environments with large temperature differences and under conditions of large loads. It is not only particularly suitable for the lifting and / or angle adjustment functions of the push rod device of the solar power generation sun tracking bracket in harsh temperature environments with large temperature differences and under conditions of large loads, but also suitable for special environments and occasions, such as scientific experiments, polar expeditions, deep-sea exploration, deserts or cold and tropical environments. Among them, the second processing method of the segmented push rod device using plastic nuts provided by the present invention also has the following advantages: simple and convenient assembly process, high production efficiency, simple processing, segmented plastic nuts D1, D2, ..., D n There is no need to turn external threads, nor is there a need to turn internal threads on the metal pipe. Moreover, turning several deep grooves in the metal pipe is simpler and more labor-saving than turning internal threads. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] Figure 1 This is a schematic diagram of the overall structure of a first embodiment of a segmented push rod device using a plastic nut according to the present invention;

[0037] Figure 2 This is a schematic diagram of a partial cross-section of the plastic nut portion of the first embodiment of the segmented push rod device using the plastic nut of the present invention;

[0038] Figure 3 This is a partial cross-sectional structural diagram of the oil-blocking structure of the first embodiment of the segmented push rod device using a plastic nut of the present invention;

[0039] Figure 4 This is an enlarged schematic diagram of a partial cross-section of the oil-blocking structure of the first embodiment of the segmented push rod device using a plastic nut of the present invention;

[0040] Figure 5 This is a schematic diagram of a first oil-blocking structure of a first embodiment of a segmented push rod device using a plastic nut of the present invention;

[0041] Figure 6 This is a schematic diagram of a second oil-blocking structure of the first embodiment of the oil-blocking structure of the segmented push rod device using a plastic nut of the present invention;

[0042] Figure 7 2. It is a schematic diagram of the installation of the input shaft and the lower housing of the oil-blocking structure of the first embodiment of the segmented push rod device using a plastic nut of the present invention;

[0043] Figure 8 1 is a schematic diagram of the overall structure of a second embodiment of a segmented push rod device using a plastic nut according to the present invention;

[0044] Figure 9 1 is a schematic diagram of the overall structure of a third embodiment of a segmented push rod device using a plastic nut according to the present invention;

[0045] Figure 10 1 is a schematic structural diagram of a third embodiment of a segmented push rod device using a plastic nut according to the present invention, cut along the AA direction;

[0046] Figure 11 1 is a schematic diagram of the overall structure of a fourth embodiment of a segmented push rod device using a plastic nut according to the present invention;

[0047] Figure 12 1 is a schematic structural diagram of a fourth embodiment of a segmented push rod device using a plastic nut according to the present invention, cut along direction BB;

[0048] Figure 13 This is a partially cutaway enlarged structural diagram of a first embodiment of the segmented push rod device using a plastic nut of the present invention;

[0049] Figure 14 This is a schematic structural diagram of the first segmented plastic nut of the segmented push rod device using the plastic nut of the present invention;

[0050] Figure 15 This is a partially cutaway enlarged structural diagram of a second embodiment of the segmented push rod device using a plastic nut according to the present invention;

[0051] Figure 16 This is a partially cutaway enlarged structural diagram of a third embodiment of the segmented push rod device using a plastic nut of the present invention;

[0052] Figure 17 This is a partial cutaway enlarged structural diagram of a fourth embodiment of the segmented push rod device using a plastic nut of the present invention;

[0053] Figure 18 1. It is a structural schematic diagram of the helix angle of the plastic nut of the segmented push rod device using the plastic nut of the present invention;

[0054] Figure 19 The present invention is a schematic structural diagram of a segmented push rod device using a plastic nut, in which a plastic nut and a metal tube are fixedly connected by a retaining spring.

[0055] In the picture:

[0056] Drive motor 100, motor end cover 110, annular boss 111, input shaft 120, exposed end 121, upper shell 200, lower shell 300, transmission device 400, screw rod 500, plastic nut 600, first section plastic nut D1, second section plastic nut D2, third section plastic nut D3, fourth section plastic nut D4, switch contact ring 700, metal tube 800, pin 801, retaining ring groove 802, retaining ring K, first retaining ring K1, second retaining ring K2, third retaining ring K3, shell mounting head 901, metal tube mounting head 902. DETAILED DESCRIPTION

[0057] The technical solution of the present invention will be clearly and completely described below in conjunction with the accompanying drawings of the embodiments of the present invention.

[0058] Example 1

[0059] like Figures 1 to 4 、 Figures 8 to 17 As shown, a segmented push rod device using a plastic nut of the present invention includes an input shaft 120, an upper shell 200, a lower shell 300, a transmission device 400, a screw 500, a plastic nut 600 and a metal tube 800. The upper shell 200 and the lower shell 300 are fixedly connected to form a reduction box body and form a space for accommodating the transmission device 400. The transmission device 400 is a gear transmission mechanism or a worm gear transmission mechanism. The input shaft 120 has an exposed end 121 located outside the reduction box body and an extended end located inside the reduction box body. The input shaft 120 and the exposed end 121 can be an integrated structure or can be The split-type installation is an integrated structure, the extending end of the input shaft 120 is a gear shaft or a worm, and the gear shaft or worm at the extending end of the input shaft 120 is respectively engaged with the first-stage gear or worm wheel of the transmission device 400, and the input shaft 120 extends into the space enclosed by the upper shell 200 and the lower shell 300. The end of the input shaft 120 is a spur gear shaft and is engaged with the first-stage spur gear of the transmission device 400; or the end of the input shaft 120 is a helical gear shaft and is engaged with the first-stage helical gear of the transmission device 400; or the end of the input shaft 120 is a worm and is engaged with the first-stage worm wheel of the transmission device 400. The final gear or worm gear of the transmission device 400 is fixedly connected to or integrally formed with the screw rod 500, driving the screw rod 500 to rotate. The plastic nut 600 is screwed onto the screw rod 500, and one end of the metal tube 800 is fixedly connected to the outer periphery of the plastic nut 600. When the screw rod 500 rotates, the plastic nut 600 is driven to perform reciprocating linear motion on the screw rod 500. The metal tube 800 and the plastic nut 600 are fixedly connected by threads. The improvement is as follows:

[0060] a. The plastic nut 600 is a segmented plastic nut structure, which is composed of two or more segmented plastic nuts D1, D2, ..., D n Combination, wherein n≥2, and n is a positive integer, the adjacent segmented plastic nuts D1, D2, ..., D n There is a separation gap between them, and at least two or more segments of the segmented plastic nut structure are segmented plastic nuts D1, D2, ..., D n All of them are fixedly connected with one end of the metal tube 800 by thread or by retaining spring. n The position of the plastic nut installed at one end of the metal tube 800 is defined as D1, and the plastic nut from the second to the nth segment located inside the metal tube 800 is defined as D2 based on the plastic nut D1. n In the segmented plastic nuts D1, D2, ..., D n The metal tube 800 can also be connected with the metal tube 800 by applying adhesive to enhance the reliability of the fixed connection between the two.

[0061] b. The segmented plastic nuts D1, D2, ..., D after the plastic nut 600 is segmented n The length of each segment L1, L2, ..., L n The plastic nut 600 at this length can withstand large static and dynamic loads and can be used in various occasions, such as coal mining machinery. When used in a push rod device for a solar power generation tracking bracket, the segmented plastic nuts D1, D2, ..., D n The length of each segment L1, L2, ..., L n The adjacent segmented plastic nuts D1, D2, ..., D n There are separation gaps C1, C2, ..., C n The plastic nuts 600 are segmented into segments of the plastic nuts D1, D2, ..., D n The length of each segment L1, L2, ..., L n It is preferably between 20 and 50 mm. Adopting the preferred size can further improve the ability of the plastic nut 600 to withstand static loads and dynamic loads.

[0062] like Figure 16 、 Figure 17As shown, in the segmented push rod device using plastic nuts of the present invention, at least two or more segments of the segmented plastic nuts D1, D2, ..., D n At the same time, it is fixedly connected with one end of the metal tube 800 by thread; or fixedly connected with a retaining spring; or at least two or more segmented plastic nuts D1, D2, ..., D n At the same time, it is fixedly connected with one end of the metal tube 800 by a pin and / or a screw; or at least two or more segmented plastic nuts D1, D2, ..., D n Some of the segmented plastic nuts are fixedly connected to one end of the metal tube 800 by pins and / or screws, while the remaining segmented plastic nuts are fixedly connected to one end of the metal tube 800 by threads. n When one end of the metal tube 800 is connected with a threaded connection, installation is convenient, while when a pin fixed connection and / or a screw fixed connection is used, the connection is reliable.

[0063] like Figure 19 As shown, in the segmented push rod device using plastic nuts of the present invention, at least two or more segmented plastic nuts D1, D2, ..., D n At the same time, the segmented plastic nuts D1, D2, ..., D n Both ends of the nut are provided with a retaining spring K, which is clamped in the retaining spring groove 802 provided on the inner wall of the metal tube 800. One end of the first segmented plastic nut D1 abuts against the first retaining spring K1, and a separation gap δ1 is provided between the other end and the second retaining spring K2. One end of the second segmented plastic nut D2 abuts against the second retaining spring K2, and a separation gap δ2 is provided between the other end and the third retaining spring K3. The nth segmented plastic nut D n One end of the nth circlip K n The other end is against the n+1th retaining spring K n+1 There is a separation gap δ between n The segmented plastic nuts D1, D2, ..., D after the plastic nut 600 is segmented n The length of each segment L1, L2, ..., L n The distance between the spring grooves 802 is greater than that between the segmented plastic nuts D1, D2, ..., D n The length of the segmented plastic nuts D1, D2, ..., D n The separation gaps δ1, δ2, ..., δ between the circlip K and the circlip K are δ1, δ2, ..., δ n All are greater than 0.05mm.

[0064] like Figure 1 、 Figure 2 、 Figure 8 、 Figure 9 、 Figure 11 、 Figure 13 、 Figure 15 、 Figure 16 As shown, in the segmented push rod device using a plastic nut of the present invention, the plastic nut 600 is a segmented plastic nut D1, D2, D3, D4 having four sections, and the segmented plastic nuts D1, D2, D3, D4 of the four sections are simultaneously fixedly connected with one end of the metal tube 800 by threads. The reliability of the fixed connection between the segmented plastic nuts D1, D2, ..., D4 and the metal tube 800 can be enhanced by adding adhesive. Of course, each of the four segmented plastic nuts D1, D2, D3, D4 can also be fixedly connected to the metal tube 800 by a pin (see Figure 16 ), the reliability of the fixed connection between the segmented plastic nuts D1, D2, ..., D4 and the metal tube 800 can be enhanced by applying adhesive.

[0065] like Figure 1 、 Figure 2 、 Figure 8 、 Figure 9 、 Figure 11 、 Figures 13 to 17 、 Figure 19 As shown, in the segmented push rod device using plastic nuts of the present invention, the segmented plastic nuts D1, D2, ..., D n The length of each segment L1, L2, ..., L n The lengths are all between 5 and 80 mm. Under the premise of ensuring that the static load and dynamic load that each segment of the segmented plastic nut can withstand can meet the design requirements, it is preferred that the static load and dynamic load that each segment can withstand is 5 to 50 mm. In order to prevent the segmented plastic nut from axially expanding at high or low temperatures, resulting in the failure of the segmented push rod device using the plastic nut to adjust the lifting and / or angle of the push rod device of the solar power generation sun tracking bracket, the adjacent segmented plastic nuts D1, D2, ..., D n There are separation gaps C1, C2, ..., C n All are greater than 0.05mm.

[0066] like Figures 13 to 17 、 Figure 19 As shown, in the segmented push rod device using plastic nuts of the present invention, when the plastic nut 600 is subjected to a dynamic load of 1 ton, all segmented plastic nuts D1, D2, ..., D nThe total length E2 is between 50 and 150 mm. All segmented plastic nuts within this total length range can withstand an overall dynamic load of 1 ton and a static load of 3 tons or more. When the plastic nut 600 withstands a dynamic load of 2 tons, all segmented plastic nuts D1, D2, ..., D n The total length E2 is between 100 and 200 mm. All segmented plastic nuts within this total length range can withstand an overall dynamic load of 2 tons and a static load of 5 to 10 tons.

[0067] like Figure 1 、 Figure 2 、 Figure 8 、 Figure 9 、 Figure 11 、 Figures 13 to 19 As shown, in the segmented push rod device using a plastic nut of the present invention, the major diameter (Ø2) of the external thread of the screw rod 500 is between 15 and 35 mm, and the matching outer diameter (Ø4) of the plastic nut 600 is between 30 and 50 mm. This matching of the screw rod 500 and the plastic nut 600 ensures that the segmented plastic nut 600 maintains excellent overall mechanical properties even in harsh environments with large temperature differences, enabling it to withstand large static and dynamic loads.

[0068] like Figures 1 to 3 、 Figure 8 、 Figure 9 、 Figure 11 、 Figure 13 、 Figures 15 to 17 、 Figure 19 As shown, in the segmented push rod device using a plastic nut of the present invention, a switch contact ring 700 is screwed and fixed to the portion of the plastic nut 600 exposed at one end of the metal tube 800. To prevent the nut 600 and the switch contact ring 700 from separating, anaerobic glue or thread fastening glue is applied to the screwed portion for connection and fixation. Alternatively, the nut 600 can be screwed into the interior of the metal tube 800, and anaerobic glue or thread fastening glue is applied to the screwed portion for connection and fixation, while the switch contact ring 700 is screwed and fixed to one end of the metal tube 800. A switch for starting the drive motor 100 in the electric push rod device is installed on the switch contact ring 700. When the electric push rod device is needed to lift and / or adjust the angle of the external mechanism, the moving component on the external mechanism used to start the electric push rod device triggers the switch device located on the switch contact ring 700, so that the drive motor 100 is powered on and starts to rotate. The input shaft 120 drives the transmission device 400 to rotate, so that the screw rod 500 rotates, and then drives the nut 600 that is threadedly fixed with the metal tube 800 to achieve reciprocating linear motion, so as to realize the function of the entire electric push rod device to lift and / or adjust the angle of the external mechanism.

[0069] like Figures 1 to 7As shown, the segmented push rod device using a plastic nut of the present invention also has a drive motor 100, which is fixedly connected to the lower housing 300. The drive shaft of the drive motor 100 is the input shaft 120 of the reduction gear box. The motor end cover 110 of the drive motor 100 has an integrally formed annular boss 111 on the outer end surface. A cap 130 is installed on the input shaft 120 of the drive motor 100. The shape of the center hole of the cap 130 is consistent with the cross-sectional shape of the corresponding mating portion of the input shaft 120. The center of the cap 130 is consistent with the cross-sectional shape of the corresponding mating portion of the input shaft 120. The hole shape is tooth-shaped or circular, which matches the tooth-shaped or circular shape of the cross section of the corresponding mating portion of the input shaft 120. The cap 130 and the input shaft 120 adopt an interference fit. The cap 130 has a groove that matches the annular boss 111 of the motor end cover 110. The groove of the cap 130 and the annular boss 111 of the motor end cover 110 have a gap to form a spatial separation. The separation gap can be between 0.2 and 0.5 mm. The cap 130 and the annular boss 111 of the motor end cover 110 form a labyrinth oil-blocking structure. The 0.2 to 0.5 mm separation gap ensures that the cap 130, which is installed as a whole by interference fit on the input shaft 120 of the drive motor 100, will not generate friction with the annular boss 111 when the input shaft 120 rotates, and will not cause obstruction to the rotation of the drive motor 100. At the same time, the cap 130 and the annular boss 111 form an oil-blocking structure that can prevent the lubricating grease from flowing from the reduction gear box into the drive motor, thereby effectively preventing the lubricating grease from seeping into the drive motor along the drive shaft of the drive motor.

[0070] like Figures 1 to 7As shown, in the segmented push rod device using a plastic nut of the present invention, the cap 130 is interference fit with the input shaft 120, the cap 130 is an umbrella-shaped structure, and the cap 130 maintains a certain gap to cover or partially cover the annular boss 111 of the motor end cover 110. When the gear shaft or worm at the end of the input shaft 120 of the drive motor 100 is respectively engaged with the first-stage spur shaft, helical shaft or worm gear of the transmission device 400, since the cap 130 covers or partially covers the outside of the annular boss 111 of the motor end cover 110, the lubricating grease located between the transmission device 400 and the input shaft 120 for achieving the lubrication function is blocked on the outside of the cap 130 and flows along the outer surface of the cap 130 in the umbrella-shaped structure into the annular concave cavity space formed by the connection between the motor end cover 110 and the lower shell 300, and the annular boss 111 located inside the cap 130 forms a seal with the cap 130. The stepped labyrinth structure prevents the lubricating grease from flowing above the annular boss 111 of the input shaft 120 even when the height of the lubricating grease in the annular concave cavity space formed by the connection between the motor end cover 110 and the lower shell 300 exceeds the height of the cap 130. The cap 130 and the annular boss 111 form an oil-blocking structure that can prevent the lubricating grease from flowing from the reduction gear box to the interior of the drive motor, which effectively solves the problem of lubricating grease penetrating into the interior of the drive motor along the drive shaft of the drive motor in the prior art.

[0071] like Figures 1 to 7 As shown, in the segmented push rod device using a plastic nut of the present invention, the outer periphery of the cap 130 is a circular or polygonal structure, and the shape of the center hole of the cap 130 is an inner gear ring shape or a circle. The annular boss 111 that matches the cap 130 to form a labyrinth oil-blocking structure is also a circular or polygonal structure. The shape of the center hole of the cap 130 is consistent with the cross-section of the corresponding matching part of the input shaft 120. At the same time, combined with the diversity of the shape of the center hole of the cap 130, the cap 130 can be applied to and matched with input shafts 120 of different shapes, as well as motor end covers 110 with different types of annular bosses 111. It has a wider versatility and can be selected according to different motor end covers 110, which is more conducive to the matching of the cap 130 with the annular boss 111 of the motor end cover 110.

[0072] like Figures 1 to 7As shown, in the segmented push rod device using a plastic nut of the present invention, the cap 130 is made of engineering plastic or metal, and the motor end cover 110 is made of metal. When the cap 130 and the motor end cover 110 are matched with each other, there are two material combinations: 1. The cap 130 and the motor end cover 110 are both made of metal; 2. The motor end cover 110 is made of metal, and the cap 130 is made of engineering plastic. The combination of dissimilar materials can achieve the best friction reduction effect. When the drive motor 100 drives the cap 130 located on the input shaft 120 to rotate, even if the cap 130 and the annular boss 111 of the motor end cover 110 generate friction, the cap 130 will not be excessively worn, causing damage to the cap 130.

[0073] like Figures 1 to 3 、 Figure 8 、 Figure 9 、 Figure 11 As shown, in the segmented push rod device using plastic nuts of the present invention, the reduction gear box is provided with a housing mounting head 901 or a metal dustproof tube with a housing mounting head 901, and the other end of the metal tube 800 is provided with a tube wall connection hole or fixedly connected to the metal tube mounting head 902. Specifically, the housing mounting head 901 is mounted on the upper shell 200 of the reduction gear box or the housing mounting head 901 is mounted on the lower shell 300 of the reduction gear box; or the upper shell 200 of the reduction gear box and the housing mounting head 901 are made into one piece or the lower shell 300 of the reduction gear box and the housing mounting head 901 are made into one piece; or the housing mounting head 901 is located on a metal dustproof tube that is integrally mounted and connected to the reduction gear box, or is located on a component that is mounted and connected to the reduction gear box. The housing mounting head 901 can be used to connect to the fixed end of an external mechanism, and the metal tube mounting head 902 can be used to connect to the moving end of an external mechanism, and vice versa.

[0074] like Figures 1 to 3 、 Figure 8 、 Figure 9 、 Figure 11 As shown, in the segmented push rod device using plastic nuts of the present invention, the reduction gearbox is fixedly connected to the housing mounting head 901, and the other end of the metal tube 800 is fixedly connected to the metal tube mounting head 902, with the metal tube mounting head 902 and the housing mounting head 901 respectively located on either side of the reduction gearbox. Of course, a modified mounting structure can also be used in which the reduction gearbox is provided with a metal dustproof tube with the housing mounting head 901, and the other end of the metal tube 800 has a tube wall connection hole, so as to be suitable for compact applications.

[0075] like Figures 1 to 3 、 Figure 8 、 Figure 9 、 Figure 11 As shown, in the segmented push rod device using a plastic nut of the present invention, the transmission device 400 is a three-stage gear transmission mechanism or a one-stage worm gear transmission mechanism. The transmission device 400 is a gear transmission mechanism with at least two stages or a one-stage or multi-stage worm gear transmission mechanism. Such a transmission device 400 can achieve structural simplification while meeting the transmission function, and preferably a three-stage gear transmission mechanism or a one-stage worm gear transmission mechanism is used. Depending on the output torque of the drive motor 100 and the speed of the input shaft 120, in order to achieve the optimal function of the electric push rod device by driving the screw 500 to drive the nut 600 up and down, a two-stage or four-stage gear transmission mechanism or a two-stage worm gear transmission mechanism can also be selected.

[0076] like Figure 1 、 Figure 3 、 Figure 4 、 Figures 7 to 12 As shown, in the segmented push rod device using a plastic nut of the present invention, the exposed end 121 of the input shaft 120 is connected to an external manual control or electric control mechanism to input power to the push rod device. The exposed end 121 of the input shaft 120 has a square, hexagonal, flat, or flower key groove structure. The exposed end 121 with various structural forms can be adapted to various structural forms of external manual control or electric control mechanisms, having the advantage of high assembly or mating stability. At the same time, the input shaft 120 with various exposed end 121 forms is highly interchangeable, more suitable for mass production, and can better achieve the transmission of external power to the transmission device 400 through the input shaft 120, thereby improving the stability of the push rod device.

[0077] like Figure 14 、 18 As shown, in the segmented push rod device using plastic nuts of the present invention, among the plastic nuts 600, the segmented plastic nuts D1, D2, ..., D n The internal thread has a helix angle Ψ≤2.90°, and the screw rod 500 has a n The internal thread has a helix angle Ψ that matches the external thread. n The internal thread and the external thread of the screw have a smaller helix angle, in the segmented plastic nut D1, D2, ..., D n After the screw rod is used to carry out the spiral transmission push rod device to reach the set lifting height and / or angle position, the segmented plastic nuts D1, D2, ..., D nIn a harsh temperature environment with a large temperature difference of -30℃ to 70℃, especially when the push rod device used for solar power generation tracking bracket is working, it still has a high self-locking ability. Even if the driving force is lost and the axial load force continues to exist, the screw will not be locked in the segmented plastic nuts D1, D2, ..., D n Relative rotation occurs in the segmented plastic nuts D1, D2, ..., D n The screw rod can be self-locked well, so that the entire push rod device can be well maintained at the set lifting height and / or angle position without causing equipment and safety accidents.

[0078] like Figure 1 、 Figure 2 、 Figure 8 、 Figure 9 、 Figure 11 、 Figure 13 、 Figure 15 As shown in the figure, the processing method of the first segmented push rod device provided by the present invention is improved in that: at least two or more segmented plastic nuts D1, D2, ..., D n At the same time, the processing steps for threadedly connecting with one end of the metal tube 800 are as follows:

[0079] Step 1: Take the blanks of the segmented plastic nuts D1, D2, D3, and D4 of the plastic nut 600, which have been processed with external threads but not yet processed with internal threads, and apply adhesive on the external threads of each of the blanks and the internal threads of the metal tube 800. The adhesive is a thread fastening adhesive. The length L1, L2, L3, and L4 of each segment of the segmented plastic nuts D1, D2, D3, and D4 is between 5 and 80 mm, and the total length E2 of all the segmented plastic nuts D1, D2, D3, and D4 of the plastic nut 600 is between 50 and 200 mm.

[0080] Step 2: Rotate and install the first segmented plastic nut D1 into the metal tube 800, and ensure that the first segmented plastic nut D1 reaches the deepest screwing position set by the metal tube 800;

[0081] Step 3: After rotating the second segmented plastic nut D2 in the metal tube until it touches the first segmented plastic nut D1, rotate the second segmented plastic nut D2 in the opposite direction within a range of 10 to 180 degrees to create a separation gap C1 between the second segmented plastic nut D2 and the first segmented plastic nut D1;

[0082] Step 4: After rotating the third segmented plastic nut D3 in the metal tube 800 until it touches the second segmented plastic nut D2, the third segmented plastic nut D3 is rotated in the opposite direction within a range of 10 to 180 degrees, so that a separation gap C2 is formed between the third segmented plastic nut D3 and the second segmented plastic nut D2;

[0083] Step 5: After rotating the fourth segmented plastic nut D4 in the metal tube 800 until it touches the third segmented plastic nut D3, the fourth segmented plastic nut D4 is rotated in the opposite direction within a range of 10 to 180 degrees, so that a separation gap C3 is formed between the fourth segmented plastic nut D4 and the third segmented plastic nut D3;

[0084] Step 6: After the adhesive solidifies, the blank segments of all the segmented plastic nuts D1, D2, D3, and D4 of the plastic nut 600 are uniformly processed with internal threads to form segmented plastic nuts D1, D2, D3, and D4 that are simultaneously threadedly fixedly connected to one end of the metal tube 800. The processing work of threading and fixing the segmented plastic nuts D1, D2, D3, and D4 to one end of the metal tube 800 is completed.

[0085] Example 2

[0086] like Figure 16 As shown, the present invention also provides another segmented push rod device using plastic nuts, which is different from the embodiment 1 in that: the segmented plastic nuts D1, D2, ..., D n The structure connected to the metal pipe 800 is a connection structure using a pin 801 for fixed connection and / or a screw for fixed connection. Each of the segmented plastic nuts D1, D2, ..., D n The position of the metal tube 800 is defined as the first segmented plastic nut located at the deepest part of the metal tube 800 as D1, and the rear segmented plastic nuts located inside the metal tube 800 are defined as D2 to D3 based on the first segmented plastic nut D1. n The segmented plastic nuts D1, D2, ..., D n A segmented structure with two or more sections, i.e., four segmented plastic nuts D1, D2, ..., D4, is employed, and each section is fixedly connected to the metal tube 800 using a pin 801 or a screw. Adhesive glue can be applied between each segmented plastic nut D1, D2, ..., D4 and the metal tube 800 to enhance the reliability of the fixed connection between the two. Of course, the connection structure using either pins or screws in this embodiment can also be replaced with a connection structure using a combination of both pins and screws.

[0087] Example 3

[0088] like Figure 17 As shown, the present invention also provides another segmented push rod device using plastic nuts, which is different from Example 1 and Example 2 in that: the segmented plastic nuts D1, D2, ..., D n The structure of the fixed connection with the metal pipe 800 is a structure that uses both the pin 801 fixed connection and the threaded fixed connection, that is, a mixed use. The segmented plastic nuts D1, D2, ..., D n The position of the metal tube 800 is defined as the first segmented plastic nut located at the deepest part of the metal tube 800 as D1, and the rear segmented plastic nuts located inside the metal tube 800 are defined as D2 to D3 based on the first segmented plastic nut D1. n The segmented plastic nuts D1, D2, ..., D n The two-stage structure consists solely of a first segmented plastic nut D1 and a second segmented plastic nut D2. The first segmented plastic nut D1 is fixedly connected to the metal tube 800 via a threaded connection, while the second segmented plastic nut D2 is fixedly connected to the metal tube 800 via a pin 801. The first segmented plastic nut D1 and the metal tube 800 can also be secured securely by applying adhesive. Of course, this embodiment can also be replaced with a structure that uses a combination of pinning for the first segmented plastic nut D1 and threading for the second segmented plastic nut D2. Alternatively, a structure that uses a combination of screws and threads can be used.

[0089] Example 4

[0090] like Figure 19 FIG. 1 is a processing method for a second segmented push rod device provided by the present invention, wherein the improvement is as follows: the processing steps for simultaneously fixing at least two or more segmented plastic nuts D1, D2, D3, and D4 of the segmented plastic nut structure in the segmented push rod device using plastic nuts to the retaining spring at one end of the metal tube 800 are as follows:

[0091] Step 1: Process five retaining ring grooves 802 with a spacing of 7 to 82 mm on the inner wall of one end of the metal tube 800;

[0092] Step 2: Processing 4 blank segments of segmented plastic nuts D1, D2, D3, and D4 with a length between 5 and 80 mm and less than the spacing distance between the corresponding retaining ring grooves 802, and the outer diameter of the blank segment is equal to the inner diameter of the metal tube 800, and the spacing distance between each retaining ring groove 802 is greater than the blank segment length of each segmented plastic nut D1, D2, D3, and D4, and the difference between the two is the separation gap δ1, δ2, δ3, and δ4, and each of the separation gaps δ1, δ2, δ3, and δ4 is greater than 0.05 mm;

[0093] Step 3: After using circlip pliers to install the first circlip K1 into the deepest first circlip groove 802 in the metal tube 800, install the first section of the blank of the first segmented plastic nut D1, whose outer circumference is coated with adhesive, into the metal tube 800, which has also been coated with adhesive, so that one end of the blank of the first segmented plastic nut D1 touches the first circlip K1. Then, use circlip pliers to install the second circlip K2 into the second circlip groove 802 in the metal tube 800. At this time, a separation gap δ1 is formed between the other end of the blank of the first segmented plastic nut D1 and the second circlip K2.

[0094] Step 4: Install a blank section of the second segmented plastic nut D2 with an outer circumference coated with adhesive into the metal tube 800 coated with adhesive, and make one end of the blank section of the second segmented plastic nut D2 touch the second retaining spring K2. Then, use retaining spring pliers to install the third retaining spring K3 into the third retaining spring groove 802 in the metal tube 800. At this time, a separation gap δ2 is formed between the other end of the blank section of the second segmented plastic nut D2 and the third retaining spring K2.

[0095] Step 5: Repeat the above steps by analogy until a section of the blank of the fourth plastic nut D4 with adhesive applied to the outer circumference is installed into the metal tube 800 coated with adhesive, and one end of the blank of the fourth segmented plastic nut D4 touches the fourth circlip K4, and then use circlip pliers to install the fifth circlip K5 into the fifth circlip groove 802 in the metal tube 800. At this time, the fifth segmented plastic nut D n A separation gap δ5 is formed between the other end of the blank segment and the fifth retaining spring K5;

[0096] Step 6: After the adhesive is cured, clamp the outer circle of the metal tube 800 and uniformly process the internal threads of the segmented plastic nuts D1, D2, D3, and D4. The processing work is completed by fixing at least two or more segments of the segmented plastic nuts D1, D2, D3, and D4 of the segmented plastic nut structure with the retaining spring at one end of the metal tube 800.

[0097] The second processing method of the segmented push rod device using plastic nuts provided by the present invention is that the segmented plastic nuts D1, D2, ..., D nA method for processing a connection structure that is fixedly connected to the metal tube 800 using a retaining spring.

Claims

1. A segmented push rod device using a plastic nut, comprising an input shaft (120), an upper shell (200), a lower shell (300), a transmission device (400), a screw (500), a plastic nut (600) and a metal tube (800), wherein the upper shell (200) and the lower shell (300) are fixedly connected to form a reduction box and form a space for accommodating the transmission device (400), wherein the transmission device (400) is a gear transmission mechanism or a worm gear transmission mechanism, wherein the input shaft (120) has an exposed end (121) located outside the reduction box and an extended end located inside the reduction box, wherein the extended end of the input shaft (120) is a gear shaft or a worm, and the gear shaft or the worm at the extended end of the input shaft (120) is respectively connected to the transmission device ( The first-stage gear or worm gear of the transmission device (400) is meshed with the first-stage gear or worm gear of the transmission device (400), the final-stage gear or worm gear is fixedly connected to or integrated with the screw rod (500), driving the screw rod (500) to rotate, the plastic nut (600) is spirally mounted on the screw rod (500), and one end of the metal tube (800) is fixedly connected to the outer periphery of the plastic nut (600), and when the screw rod (500) rotates, the plastic nut (600) is driven to perform reciprocating linear motion on the screw rod (500); it is characterized in that: a. The plastic nut (600) is a segmented plastic nut structure, the segmented plastic nut structure is composed of at least two or more segmented plastic nuts (D1, D2, ..., Dn), wherein n ≥ 2, and n is a positive integer, adjacent segmented plastic nuts (D1, D2, ..., Dn) have separation gaps, and at least two or more segmented plastic nuts (D1, D2, ..., Dn) of the segmented plastic nut structure are simultaneously fixedly connected to one end of the metal tube (800); b. After the plastic nut (600) is segmented, the length (L1, L2, ..., Ln) of each segment of the segmented plastic nut (D1, D2, ..., Dn) is between 5 and 50 mm, and the separation gaps (C1, C2, ..., Cn) between adjacent segmented plastic nuts (D1, D2, ..., Dn) are all greater than 0.05 mm. The major diameter Φ2 of the external thread of the screw rod (500) is between 15 and 35 mm, and the outer diameter Φ4 of the plastic nut (600) matched therewith is between 30 and 50 mm.

2. The segmented push rod device using a plastic nut according to claim 1, characterized in that: At least two or more segmented plastic nuts (D1, D2, ..., Dn) of the segmented plastic nut structure are simultaneously threadedly fixedly connected to one end of the metal tube (800); or are fixedly connected by a retaining spring; or at least two or more segmented plastic nuts (D1, D2, ..., Dn) of the segmented plastic nut structure are simultaneously pin-fixedly connected and / or screw-fixedly connected to one end of the metal tube (800); or some of the segmented plastic nuts (D1, D2, ..., Dn) of the segmented plastic nut structure are pin-fixedly connected and / or screw-fixedly connected to one end of the metal tube (800) while the remaining segmented plastic nuts are threadedly fixedly connected to one end of the metal tube (800).

3. The segmented push rod device using a plastic nut according to claim 1, characterized in that: The points At least two or more segmented plastic nuts (D1, D2, ..., Dn) of the segmented plastic nut structure are simultaneously A retaining spring is fixedly connected to one end of the metal tube (800), and retaining springs (K) are provided at both ends of each segmented plastic nut (D1, D2, ..., Dn), and the retaining springs (K) are clamped in retaining spring grooves (802) provided on the inner wall of the metal tube (800). One end of the first segmented plastic nut (D1) abuts against the first retaining spring (K1), and a separation gap δ1 is provided between the other end and the second retaining spring (K2). One end of the second segmented plastic nut (D2) abuts against the second retaining spring (K2), and a separation gap δ2 is provided between the other end and the third retaining spring (K3). One end of the nth segmented plastic nut (Dn) abuts against the nth retaining spring (Kn), and the other end abuts against the n+1th retaining spring (Kn). A separation gap δn is provided between the retaining springs (Kn+1); the length (L1, L2, ..., Ln) of each segmented plastic nut (D1, D2, ..., Dn) after the plastic nut (600) is segmented is between 5 and 50 mm, the spacing distance between each retaining spring groove (802) is greater than the length of each segmented plastic nut (D1, D2, ..., Dn), and the separation gaps (δ1, δ2, ..., δn) between the segmented plastic nut (D1, D2, ..., Dn) and the retaining spring (K) are greater than 0.05 mm.

4. The segmented push rod device using a plastic nut according to claim 1, characterized in that: The invention also comprises a driving motor (100), wherein the driving motor (100) is fixedly connected to the lower housing (300), the driving shaft of the driving motor (100) is the input shaft (120) of the reduction gear box, the outer end surface of the motor end cover (110) of the driving motor (100) is provided with an integrally formed annular boss (111), and a cap (130) is mounted on the input shaft (120) of the driving motor (100), the shape of the center hole of the cap (130) is consistent with the cross-sectional shape of the corresponding mating portion of the input shaft (120), the cap (130) is provided with a groove matching the annular boss (111) of the motor end cover (110), and the cap (130) and the annular boss (111) of the motor end cover (110) form a labyrinth oil-blocking structure.

5. The segmented push rod device using a plastic nut according to claim 1, characterized in that: The reduction gearbox body is provided with a housing mounting head (901) or a metal dustproof tube with a housing mounting head (901), and the other end of the metal tube (800) is provided with a tube wall connection hole or is fixedly connected to the metal tube mounting head (902).

6. The segmented push rod device using a plastic nut according to claim 1, characterized in that: The reduction gear box body is fixedly connected to a housing mounting head (901), the other end of the metal tube (800) is fixedly connected to a metal tube mounting head (902), and the metal tube mounting head (902) and the housing mounting head (901) are respectively located on both sides of the reduction gear box body, and the transmission device (400) is a three-stage gear transmission mechanism or a one-stage worm gear transmission mechanism.

7. The segmented push rod device using a plastic nut according to claim 1, characterized in that: In the plastic nut (600), the helix angle Ψ of the internal thread of the segmented plastic nut (D1, D2, ..., Dn) of any section is ≤2.90°, and the screw rod (500) has an external thread that matches the helix angle Ψ of the internal thread of the segmented plastic nut (D1, D2, ..., Dn).

8. A method for producing a segmented push rod device using a plastic nut according to any one of claims 1, 2, and 4-7, characterized in that: The processing steps for simultaneously threading and fixing at least two or more segmented plastic nuts (D1, D2, ..., Dn) of the segmented plastic nut structure in the segmented push rod device using plastic nuts to one end of the metal tube (800) are as follows: Step 1: Take the blank segments of each segmented plastic nut (D1, D2, ..., Dn) of the plastic nut (600) that have been processed with external threads but not yet processed with internal threads, apply adhesive on the external threads of each of the blank segments and the internal threads of the metal tube (800), wherein the adhesive is thread fastening adhesive, and the length (L1, L2, ..., Ln) of each blank segment of the segmented plastic nut (D1, D2, ..., Dn) is between 5 and 50 mm; Step 2: Rotate and install the blank section of the first segmented plastic nut (D1) into the metal tube (800), and make the blank section of the first segmented plastic nut (D1) reach the deepest screwing position set by the metal tube (800); Step 3: After the blank section of the second segmented plastic nut (D2) is rotated in the metal tube (800) until it touches the blank section of the first segmented plastic nut (D1), the blank section of the second segmented plastic nut (D2) is rotated in the opposite direction within a range of 10 to 180 degrees, so that a separation gap is generated between the blank section of the second segmented plastic nut (D2) and the blank section of the first segmented plastic nut (D1); Step 4: Repeat the above steps by analogy until the blank section of the nth segmented plastic nut (Dn) is rotated in the metal tube (800) until it touches the blank section of the n-1th segmented plastic nut (Dn-1), and then the blank section of the nth segmented plastic nut (Dn) is rotated in the reverse direction, and the rotation degree range is between 10 and 180 degrees, so that A separation gap is generated between the blank section of the n-th segmented plastic nut (Dn) and the blank section of the n-1-th segmented plastic nut (Dn-1); Step 5: After the adhesive is solidified, the blank sections of all the segmented plastic nuts (D1, D2, ..., Dn) of the plastic nut (600) are uniformly processed with internal threads to form segmented plastic nuts (D1, D2, ..., Dn) that are simultaneously threadedly fixedly connected to one end of the metal tube (800). The processing work of threading and fixing the segmented plastic nuts (D1, D2, ..., Dn) to one end of the metal tube (800) is completed.

9. A method for producing a segmented push rod device using a plastic nut according to claim 3, characterized in that: The processing steps for simultaneously fixing at least two or more segmented plastic nuts (D1, D2, ..., Dn) of the segmented plastic nut structure in the segmented push rod device using plastic nuts to a retaining spring at one end of the metal tube (800) are as follows: Step 1: Processing n+1 retaining ring grooves (802) with a spacing of 7 to 82 mm on the inner wall of one end of the metal tube (800); Step 2: Processing n segments of blank segments of segmented plastic nuts (D1, D2, ..., Dn) with a length between 5 and 50 mm and less than the spacing distance between the corresponding retaining ring grooves (802), and the outer diameter of the blank segment is equal to the inner diameter of the metal tube (800), and the spacing distance between each retaining ring groove (802) is greater than the blank segment length of each segmented plastic nut (D1, D2, ..., Dn), and the difference between the two is the separation gap (δ1, δ2, ..., δn), and each separation gap (δ1, δ2, ..., δn) is greater than 0.05 mm; Step 3: After using circlip pliers to install the first circlip (K1) into the deepest first circlip groove (802) in the metal tube (800), install the blank section of the first segmented plastic nut (D1) with the first outer circumference coated with adhesive into the metal tube (800) coated with adhesive, and make one end of the blank section of the first segmented plastic nut (D1) touch the first circlip (K1), and then use circlip pliers to install the second circlip (K2) into the second circlip groove (802) in the metal tube (800), at this time, a separation gap δ1 is formed between the other end of the blank section of the first segmented plastic nut (D1) and the second circlip (K2); Step 4: Install a blank section of the second segmented plastic nut (D2) with an outer circumference coated with adhesive into the metal tube (800) coated with adhesive, and make one end of the blank section of the second segmented plastic nut (D2) touch the second retaining ring (K2), and then use retaining ring pliers to install the third retaining ring (K3) into the third retaining ring groove (802) in the metal tube (800), at this time, a separation gap δ2 is formed between the other end of the blank section of the second segmented plastic nut (D2) and the third retaining ring (K3); Step 5: Repeat the above steps by analogy until a blank section of the nth segmented plastic nut (Dn) with an outer circumference coated with adhesive is installed in the metal tube (800) coated with adhesive, and one end of the blank section of the nth segmented plastic nut (Dn) touches the nth retaining ring (Kn), and then the n+1th retaining ring (Kn+1) is installed into the n+1th retaining ring groove (802) in the metal tube (800) using retaining ring pliers. At this time, a separation gap δn is formed between the other end of the blank section of the nth segmented plastic nut (Dn) and the n+1th retaining ring (Kn+1); Step 6: After the adhesive is cured, the outer circle of the metal tube (800) is clamped, and the internal threads of the segmented plastic nuts (D1, D2, ..., Dn) are uniformly processed. At least two or more segments of the segmented plastic nuts (D1, D2, ..., Dn) of the segmented plastic nut structure are simultaneously fixedly connected to the retaining spring at one end of the metal tube (800), and the processing work is completed.

Images