A push rod device for a hollow window type plastic nut

Abstract

The present invention provides a push rod device for a hollow window type plastic nut, which relates to the technical field of push rod devices and includes an assembly housing, a screw rod, a plastic nut, and a metal tube. A reduction drive mechanism is provided in the assembly housing, one end of the screw rod is rotatably arranged on the assembly housing, the screw rod is driven and arranged by the reduction drive mechanism, the plastic nut is threaded and rotatably arranged on the outside of the screw rod, the metal tube is arranged on the outside of the plastic nut, the screw rod is driven and rotated by the reduction drive mechanism, and drives the plastic nut to perform reciprocating linear motion on the screw rod. A hollow groove is provided on the outside of the plastic nut, and multiple plastic nuts can be spliced. The present invention provides multiple plastic nuts, and the uniform hollow grooves are provided on the outside of the plastic nut, so that when the plastic nut is heated or cooled and deformed, it can be squeezed into the hollow groove, thereby increasing the expansion space of the plastic nut.

Description

Technical Field

[0001] The present invention relates to the technical field of push rod devices, in particular to a push rod device of a hollow window type plastic nut. Background Art

[0002] The technology of using solar power generation devices to generate electricity is becoming increasingly common worldwide. In order to maximize the utilization of solar energy by solar power generation devices, existing technologies use solar tracking brackets to achieve real-time adjustment of the lifting and (or) angle of the solar panels in the solar power generation device to follow the different spatial angles of the sun. 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. Therefore, this places strict requirements on the use of push rod devices, requiring each push rod device 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. They have a low coefficient of linear expansion, preventing axial stiffness as the ambient temperature rises and falls. However, copper nuts have a disadvantage: they lack self-lubrication 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 push rod assembly inoperable. A typical solar farm has thousands of push rods, 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 higher static and dynamic loads, axial expansion may occur due to the large linear expansion coefficient of the plastic material when used in harsh environments with large temperature fluctuations.

[0006] 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 higher static and dynamic loads, axial expansion may occur due to the large linear expansion coefficient of the plastic material when used in harsh environments with large temperature fluctuations. Summary of the Invention

[0007] The purpose of the present invention is to solve the problem in the prior art that when used in a severe temperature environment with large temperature changes, axial expansion will occur due to the large linear expansion coefficient of the plastic material.

[0008] In order to achieve the above-mentioned purpose, the present invention adopts the following technical solution: a push rod device for a hollow window type plastic nut, comprising an assembly shell, a screw rod, a plastic nut and a metal tube, a reduction drive mechanism being provided in the assembly shell, one end of the screw rod being rotatably set on the assembly shell, the screw rod being driven and set by the reduction drive mechanism, the plastic nut being threaded and rotatably set on the outside of the screw rod, the metal tube being set on the outside of the plastic nut, the screw rod being driven and rotated by the reduction drive mechanism, driving the plastic nut to perform reciprocating linear motion on the screw rod, a hollow groove being provided on the outside of the plastic nut, and multiple plastic nuts can be spliced ​​and set.

[0009] As a preferred embodiment, the deceleration drive mechanism includes a motor, a driving gear, a passive gear and a reduction gear set. The driving gear, the reduction gear set and the passive gear are all rotatably arranged in the assembly shell. One end of the screw rod is linked to the passive gear. The driving gear is linked to the passive gear through the reduction gear set. The driving gear is driven by the motor. By driving the motor, the driving gear is driven to rotate, and then the reduction gear set and the passive gear are driven to engage and rotate, and then the screw rod is driven to rotate. The screw rod is decelerated by the reduction gear set.

[0010] As a preferred embodiment, the reduction gear group includes a first gear, a second gear and a third gear. The first gear is coaxially linked with the driving gear, the second gear is coaxially linked with the third gear, the first gear is meshed with the second gear, and the third gear is linked with the driven gear. The diameters of the first gear, the second gear and the driven gear increase in sequence. The driving gear is driven to rotate by the motor, which drives the first gear to rotate, and then drives the second gear and the third gear to rotate. Since the number of teeth of the first gear is less than that of the second gear, the rotation speed of the first gear is less than the rotation speed of the second gear. It can be obtained that the rotation speed of the driven gear meshed with the third gear is less than the rotation speed of the third gear. Therefore, the driven gear can be effectively decelerated through the reduction gear group.

[0011] As a preferred embodiment, a fixing tube is provided on the assembly shell, and the inner side of the fixing tube is connected to the screw rod through a bearing. The surface of the screw rod and the bearing assembly connection position is smooth. The setting of the fixing tube and the setting of the bearing increase the stability of the screw rod in rotating on the assembly shell, and the fixing tube is used to limit the rotation of the screw rod.

[0012] As a preferred embodiment, the metal tube is provided with a switch contact ring on the outer side of one end of the plastic nut, and the switch contact ring is provided with a switch for starting the motor. When the push rod device is driven, the switch on the switch contact ring is triggered, and the motor is driven to rotate, driving the reduction drive mechanism to operate, and then driving the screw to rotate.

[0013] As a preferred embodiment, the plastic nut is provided with multiple and spliced ​​together on the inner side of one end of the metal tube, and the hollow grooves are evenly distributed in the shape of longitudinal strips on the outside of the plastic nut. By providing multiple plastic nuts, additional expansion space can be provided for the plastic nut when it is deformed. By providing uniform hollow grooves on the outside of the plastic nut, when the plastic nut is deformed by heating or cooling, it can be squeezed into the hollow groove, thereby increasing the expansion space of the plastic nut.

[0014] As a preferred embodiment, a limit block is provided at one end of the plastic nut, and a limit groove is provided at the other end of the plastic nut which is fitted with the limit block. The length of the limit block is longer than the depth of the limit groove. The limit block and the limit groove are engaged with each other to facilitate limiting the position between two adjacent plastic nuts. By setting the length of the limit block to be longer than the depth of the limit groove, a gap is left between two adjacent plastic nuts during splicing, so that the plastic nut can be squeezed in when it expands and deforms.

[0015] As a preferred embodiment, the length difference between the limiting block and the limiting groove is one tenth of the overall length of the plastic nut.

[0016] As a preferred embodiment, a mounting ring is provided at the center position of the outer side of the plastic nut, the outer side of the mounting ring is flush with the outer side of the plastic nut, a threaded hole is provided on the mounting ring, a bolt is threaded through the metal tube, one end of the bolt is threaded through the metal tube and is threadedly assembled with the threaded hole. When installing the plastic nut and the metal tube, one end of the bolt is threaded through the metal tube and is threadedly connected to the threaded hole to achieve the installation operation between the plastic nut and the metal tube.

[0017] As a preferred embodiment, a limiting ring is provided on the side wall of the end of the screw rod away from the plastic nut, the outer wall of the limiting ring is slidingly arranged with the inner wall of the metal tube, and the end face of the metal tube is provided with a connecting head. Through the provided limiting ring, the stability of the movement of the screw rod can be ensured when sliding in the metal tube, and there will be no swinging phenomenon due to the long screw rod. The provided connecting head facilitates the installation of the metal tube.

[0018] Compared with the prior art, the advantages and positive effects of the present invention are:

[0019] 1. The present invention provides additional expansion space for the plastic nut when it is deformed by providing multiple plastic nuts. By providing uniform hollow grooves on the outside of the plastic nut, when the plastic nut is deformed by heating or cooling, it can be squeezed into the hollow groove, thereby increasing the expansion space of the plastic nut.

[0020] 2. The present invention increases the stability of the screw rod rotating on the assembly housing by providing a fixed tube in conjunction with the provided bearing, and limits the rotation of the screw rod through the fixed tube and the bearing.

[0021] 3. When installing the plastic nut and the metal pipe, one end of the bolt is threaded through the metal pipe and is rotatably connected to the threaded hole, thereby achieving the installation operation between the plastic nut and the metal pipe and ensuring the stability of the installation of the plastic nut.

[0022] 4. The present invention provides a limiting ring to ensure the stability of the movement of the screw rod when it slides in the metal tube, and does not cause the screw rod to swing due to its length. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 A three-dimensional diagram of a push rod device for a hollow window type plastic nut provided by the present invention;

[0024] Figure 2 A schematic diagram of the assembly of the assembly housing and the reduction drive mechanism of the push rod device of the hollow window type plastic nut provided by the present invention;

[0025] Figure 3A schematic diagram of the assembly housing and screw rod of a push rod device of a hollow window type plastic nut provided by the present invention;

[0026] Figure 4 A schematic diagram of the internal assembly structure of a metal tube of a push rod device of a hollow window type plastic nut provided by the present invention;

[0027] Figure 5 A schematic diagram of the assembly of a screw rod and a plastic nut of a push rod device of a hollow window type plastic nut provided by the present invention;

[0028] Figure 6 The present invention provides a push rod device for a hollow window type plastic nut Figure 4 A schematic diagram of the structure at center A;

[0029] Figure 7 A three-dimensional view of a plastic nut of a push rod device of a hollow window type plastic nut provided by the present invention.

[0030] Legend:

[0031] 1. Assembly housing; 2. Screw; 3. Plastic nut; 4. Metal tube; 5. Hollow groove; 61. Motor; 62. Drive gear; 63. Passive gear; 71. First gear; 72. Second gear; 73. Third gear; 81. Fixed tube; 82. Bearing; 9. Switch contact ring; 101. Limit block; 102. Limit groove; 111. Mounting ring; 112. Threaded hole; 113. Bolt; 121. Limit ring; 122. Connector. DETAILED DESCRIPTION

[0032] The following will provide a clear and complete description of the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without making any creative efforts shall fall within the scope of protection of the present invention.

[0033] See also Figure 1-7 The present invention provides a technical solution: a push rod device for a hollow window type plastic nut, comprising an assembly shell 1, a screw rod 2, a plastic nut 3 and a metal tube 4. A reduction drive mechanism is provided in the assembly shell 1, one end of the screw rod 2 is rotatably set on the assembly shell 1, and the screw rod 2 is driven by the reduction drive mechanism. The plastic nut 3 is threaded and rotatably set on the outside of the screw rod 2, and the metal tube 4 is set on the outside of the plastic nut 3. The screw rod 2 is driven to rotate by the reduction drive mechanism, driving the plastic nut 3 to perform reciprocating linear motion on the screw rod 2. A hollow groove 5 is provided on the outside of the plastic nut 3, and multiple plastic nuts 3 can be spliced.

[0034] like Figure 1-7As shown, the deceleration drive mechanism includes a motor 61, a driving gear 62, a driven gear 63 and a reduction gear set. The driving gear 62, the reduction gear set and the driven gear 63 are all rotatably arranged in the assembly housing 1. One end of the screw rod 2 is linked to the driven gear 63. The driving gear 62 is linked to the driven gear 63 through the reduction gear set. The driving gear 62 is driven by the motor 61. By driving the motor 61, the driving gear 62 is driven to rotate, and then the reduction gear set and the driven gear 63 are driven to engage and rotate, and then the screw rod 2 is driven to rotate. Through the reduction gear set, the screw rod 2 is decelerated.

[0035] like Figure 1-7 As shown, the reduction gear set includes a first gear 71, a second gear 72 and a third gear 73. The first gear 71 is coaxially linked with the driving gear 62, and the second gear 72 is coaxially linked with the third gear 73. The first gear 71 is meshed with the second gear 72, and the third gear 73 is linked with the driven gear 63. The diameters of the first gear 71, the second gear 72 and the driven gear 63 increase successively. The driving gear 62 is driven to rotate by the motor 61, thereby driving the first gear 71 to rotate, and then driving the second gear 72 and the third gear 73 to rotate. Since the first gear 71 has fewer teeth than the second gear 72, the speed of the first gear 71 is less than the speed of the second gear 72. It can be obtained that the speed of the driven gear 63 meshed with the third gear 73 is less than the speed of the third gear 73. Therefore, the driven gear 63 can be effectively decelerated through the reduction gear set.

[0036] like Figure 1-7 As shown, a fixed tube 81 is provided on the assembly shell 1, and the inner side of the fixed tube 81 is assembled and connected to the screw rod 2 through a bearing 82. The surface of the assembly connection position between the screw rod 2 and the bearing 82 is smooth. The fixed tube 81 is provided in conjunction with the bearing 82, which increases the stability of the screw rod 2 in rotating on the assembly shell 1, and the fixed tube 81 is used to limit the rotation of the screw rod 2.

[0037] like Figure 1-7 As shown, a switch contact ring 9 is provided on the outer side of one end of the metal tube 4 with a plastic nut 3, and a switch for starting the motor 61 is provided on the switch contact ring 9. When the push rod device is driven, the switch on the switch contact ring 9 is triggered, and the motor 61 is driven to rotate, driving the reduction drive mechanism to operate, and then driving the screw rod 2 to rotate.

[0038] like Figure 1-7As shown, the plastic nut 3 is provided with multiple pieces and is spliced ​​together and arranged on the inner side of one end of the metal tube 4. The hollow grooves 5 are evenly distributed in the shape of longitudinal strips on the outside of the plastic nut 3. The multiple plastic nuts 3 are provided to provide additional expansion space for the plastic nut 3 when it is deformed. By providing uniform hollow grooves 5 on the outside of the plastic nut 3, when the plastic nut 3 is deformed by heat or cold, it can be squeezed into the hollow grooves 5, thereby increasing the expansion space of the plastic nut 3.

[0039] like Figure 1-7 As shown, a limit block 101 is provided at one end of the plastic nut 3, and a limit groove 102 is provided at the other end of the plastic nut 3 which is engaged with the limit block 101. The length of the limit block 101 is longer than the depth of the limit groove 102. The engagement of the limit block 101 and the limit groove 102 facilitates the limiting of two adjacent plastic nuts 3. By setting the length of the limit block 101 to be longer than the depth of the limit groove 102, a gap is left between two adjacent plastic nuts 3 during splicing, so that the plastic nuts 3 can be squeezed in when they expand and deform.

[0040] like Figure 1-7 As shown, the length difference between the limiting block 101 and the limiting groove 102 is one tenth of the overall length of the plastic nut 3 .

[0041] like Figure 1-7 As shown, a mounting ring 111 is provided at the center position of the outer side of the plastic nut 3, and the outer side of the mounting ring 111 is flush with the outer side of the plastic nut 3. A threaded hole 112 is provided on the mounting ring 111, and a bolt 113 is threaded through the metal tube 4. One end of the bolt 113 is threaded through the metal tube 4 and is threadedly assembled with the threaded hole 112. When installing the plastic nut 3 and the metal tube 4, one end of the bolt 113 is threaded through the metal tube 4 and is threadedly connected to the threaded hole 112 to achieve the installation operation between the plastic nut 3 and the metal tube 4.

[0042] like Figure 1-7 As shown, a limiting ring 121 is provided on the side wall of the end of the screw rod 2 away from the plastic nut 3. The outer wall of the limiting ring 121 is slidably arranged with the inner wall of the metal tube 4. The end face of the metal tube 4 is provided with a connecting head 122. Through the setting of the limiting ring 121, the stability of the movement of the screw rod 2 can be ensured when sliding in the metal tube 4, and the screw rod 2 will not swing due to its long length. The setting of the connecting head 122 facilitates the installation of the metal tube 4.

[0043] Working principle: When the push rod device is operating, the metal tube 4 is assembled and fixed at one end away from the assembly shell 1, and the reduction drive mechanism is driven to drive the screw rod 2 to rotate. Since the plastic nut 3 is linked to the inner side of the metal tube 4, the plastic nut 3 and the screw rod 2 are threaded and rotated, and the rotation of the screw rod 2 can drive the metal tube 4 to reciprocate linearly on the screw rod 2. By arranging a hollow groove 5 on the outer side of the plastic nut 3, the deformation of the plastic nut 3 and the axial expansion caused by the plastic nut 3 can be avoided in a low or high temperature environment, thereby causing the plastic nut 3 to slide on the screw rod 2 and fail, resulting in the failure of the adjustment function of the push rod device. By setting multiple plastic nuts 3, and multiple plastic nuts 3 can be directly spliced ​​and arranged, a certain gap is left between adjacent plastic nuts 3, which can provide additional expansion space for the plastic nut 3 when it is deformed, avoiding squeezing and expansion with the screw rod 2, and ensuring the service life of the plastic nut 3.

[0044] The above description is merely a preferred embodiment of the present invention and does not constitute any other form of limitation to the present invention. Any person skilled in the art may utilize the technical contents disclosed above to change or modify them into equivalent embodiments with equivalent changes for application in other fields. However, any simple modification, equivalent change, and modification of the above embodiments made in accordance with the technical essence of the present invention without departing from the technical solution of the present invention shall still fall within the scope of protection of the technical solution of the present invention.

Claims

1. A push rod device for a hollow window type plastic nut, comprising an assembly housing (1), a screw rod (2), a plastic nut (3) and a metal tube (4), wherein a reduction drive mechanism is provided in the assembly housing (1), one end of the screw rod (2) is rotatably arranged on the assembly housing (1), the screw rod (2) is driven by the reduction drive mechanism, the plastic nut (3) is threadedly rotatably arranged outside the screw rod (2), and the metal tube (4) is arranged outside the plastic nut (3), characterized in that: The screw rod (2) is driven to rotate by a reduction drive mechanism, driving the plastic nut (3) to perform reciprocating linear motion on the screw rod (2). A hollow groove (5) is provided on the outer side of the plastic nut (3), and a plurality of the plastic nuts (3) can be spliced ​​together. The plastic nuts (3) are provided in plurality and are spliced ​​together and arranged on the inner side of one end of the metal tube (4); the hollow grooves (5) are evenly distributed in the form of longitudinal strips and arranged on the outer side of the plastic nuts (3); One end of the plastic nut (3) is provided with a limiting block (101), and the other end of the plastic nut (3) is provided with a limiting groove (102) that fits in the limiting block (101), and the length of the limiting block (101) is longer than the depth of the limiting groove (102).

2. The push rod device for a hollow window type plastic nut according to claim 1, characterized in that: The deceleration drive mechanism comprises a motor (61), a driving gear (62), a driven gear (63) and a reduction gear set. The driving gear (62), the reduction gear set and the driven gear (63) are all rotatably arranged in the assembly housing (1). One end of the screw rod (2) is linked to the driven gear (63). The driving gear (62) is linked to the driven gear (63) through the reduction gear set. The driving gear (62) is driven by the motor (61).

3. The push rod device for a hollow window type plastic nut according to claim 2, characterized in that: The reduction gear set comprises a first gear (71), a second gear (72) and a third gear (73); the first gear (71) is coaxially linked with the driving gear (62); the second gear (72) is coaxially linked with the third gear (73); the first gear (71) is meshed with the second gear (72); the third gear (73) is linked with the driven gear (63); the diameters of the first gear (71), the second gear (72) and the driven gear (63) increase in sequence.

4. The push rod device for a hollow window type plastic nut according to claim 3, characterized in that: The assembly housing (1) is provided with a fixing tube (81), the inner side of the fixing tube (81) is assembled and connected to the screw rod (2) via a bearing (82), and the surface of the assembly connection position between the screw rod (2) and the bearing (82) is smooth.

5. The push rod device for a hollow window type plastic nut according to claim 2, characterized in that: The metal tube (4) is provided with a switch contact ring (9) on the outer side of one end of the plastic nut (3), and the switch contact ring (9) is provided with a switch for starting the motor (61).

6. The push rod device for a hollow window type plastic nut according to claim 5, characterized in that: The length difference between the limiting block (101) and the limiting groove (102) is one tenth of the overall length of the plastic nut (3).

7. The push rod device for a hollow window type plastic nut according to claim 6, characterized in that: A mounting ring (111) is provided at the center of the outer side of the plastic nut (3), the outer side of the mounting ring (111) is flush with the outer side of the plastic nut (3), a threaded hole (112) is provided on the mounting ring (111), a bolt (113) is threadedly passed through the metal pipe (4), and one end of the bolt (113) is threadedly passed through the metal pipe (4) and is threadedly assembled with the threaded hole (112).

8. The push rod device for a hollow window type plastic nut according to claim 7, characterized in that: A limiting ring (121) is provided on the side wall of one end of the screw rod (2) away from the plastic nut (3), the outer wall of the limiting ring (121) is slidably arranged with the inner wall of the metal tube (4), and a connector (122) is provided on the end face of the metal tube (4).

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