WO2023061497A1

WO2023061497A1 - Groove-paired push rod device using plastic nut

Info

Publication number: WO2023061497A1
Application number: PCT/CN2022/125472
Authority: WO
Inventors: 杨宗行; 吴志坚; 徐�明
Original assignee: 常州姆驰机电有限公司
Priority date: 2021-10-17
Filing date: 2022-10-14
Publication date: 2023-04-20

Abstract

The present application relates to a groove-paired push rod device using a plastic nut. The plastic nut has a groove-paired plastic nut structure, and the inner wall surface and the outer wall surface of the plastic nut are at least provided with one pair or n pairs of inner circumferential ring grooves and outer circumferential ring grooves paired with the inner circumferential ring grooves and having the same axial positions or having offset in the axial positions; the lengths of inner circumferential wall ring sections and outer circumferential wall ring sections formed by division by the groove pairs are all smaller than or equal to 80 mm; the groove widths of the inner circumferential ring grooves and the groove widths of the outer circumferential ring grooves are all greater than 0.05 mm; the radial wall thickness or radial distance γ between the groove bottoms of the inner circumferential ring groove and outer circumferential ring groove of each groove pair is smaller than or equal to 3.0 mm; the total length of the plastic nut ranges from 50 mm to 200 mm. The present application has good self-lubricating performance, does not need frequent relubrication, would not axially expand to failure in severe temperature environments with large temperature differences and under large loads, and is particularly suitable for push rod devices for solar power generation sun tracker supports and severe environments.

Description

Split-slot push rod assembly with plastic nut

Cross References to Related Applications

This disclosure requires that the application number submitted to the China Patent Office on December 19, 2021 is 202111557608.0, and the name is "Slotted Push Rod Device Using Plastic Nuts" and the application number submitted to the China Patent Office on December 19, 2021 is 202123192577.1, titled "A Slotted Push Rod Device Using Plastic Nuts" and the application number 202111206646.1, titled "Slotted Push Rod Device Using Plastic Nuts and Its processing method" and the application number 202111335611.8 submitted to the China Patent Office on November 11, 2021, entitled "Slotted push rod device using plastic nuts and its processing method" and submitted to the China Patent Office on March 16, 2022 The application number is 202210259746.9, the name is "slotted push rod device using plastic nut and its processing method", and the application number 202220579455.3, which is named "a plastic nut using plastic nut", was submitted to the China Patent Office on March 16, 2022. Slotted push rod device" and the application number 202210707237.8 submitted to the China Patent Office on June 21, 2022, titled "Slotted push rod device using plastic nuts and its processing method" and submitted on June 28, 2022 The priority of Chinese patent application No. 202221636757.6 entitled "A Slotted Push Rod Device Using Plastic Nut" from the China Patent Office, the entire contents of which are incorporated by reference in this disclosure.

technical field

The disclosure belongs to the technical field of push rod devices, and in particular relates to a split-slot push rod device using plastic nuts, especially a push rod device suitable for solar power generation solar tracking brackets.

Background technique

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, the existing technology uses solar tracking brackets to realize solar sails in solar power generation devices. The plate follows the different spatial angle positions of the sun for real-time adjustment of the lifting and/or angle, while the lifting and/or angle adjustment functions of the solar tracking bracket are all realized by using a push rod device. Due to the harsh outdoor environment used by solar power generation devices, it usually needs to withstand the ambient temperature of -30°C to 70°C to work, and the solar power generation device needs to work in strong winds, and the wind force has a greater force on the solar power generation device. Therefore, there are strict requirements for the use of push rod devices, requiring each set of push rod devices to be able to withstand a static load of not less than 3 tons, and at the same time need to meet a dynamic load of not less than 1 ton.

In order to meet the requirement that the solar tracking bracket can work normally at an ambient temperature of -30°C to 70°C, and can withstand a static load of not less than 3 tons and a dynamic load of not less than 1 ton, and the working life is not less than 5000 hours. The push rod device that realizes the lifting and/or angle adjustment function of the solar tracking bracket has a designed service life of more than 10,000 cycles for lifting and/or angle adjustment, in which the screw and nut play a vital role , in order to reduce the wear of the screw and the nut during the reciprocating spiral movement, the screw is usually made of metal, but the nuts are usually made of copper nuts and plastic nuts.

For copper nuts, there are the following advantages: 1. Copper nuts are used in severe temperature environments with large temperature changes, and have high strength and can withstand large static and dynamic loads; 2. Copper nuts have a small linear expansion coefficient. There will be no problem of axial swelling when the ambient temperature rises and falls. However, the disadvantage of copper nuts is that copper nuts have poor self-lubricating ability when used in severe temperature environments with large temperature changes. Under a dynamic load of 1 ton, taking the lifting distance of copper nuts as an example, the number of lifting times is less than 150 times. Just must add lubricating grease frequently and could guarantee that it and the screw mandrel carry out the smooth motion of screw transmission process. If the lifting times without adding lubricating grease reaches about 200 times, the screw rod will completely wear the copper nut, causing the entire push rod device to lose its working ability. Generally, there are tens of thousands of push rod devices in a solar farm, and frequent filling of lubricating grease requires huge investment in cost, manpower and material resources.

The advantages of plastic nuts are that they have good self-lubricating properties, and the lubrication of the entire life cycle can be satisfied by adding lubricating grease once, and the smooth transmission process between the screw and the screw can be guaranteed without frequent addition of lubricating oil. . However, plastic nuts have the following disadvantages: the plastic material has poor strength and cannot bear large static loads and dynamic loads. If the length of a single nut is increased to withstand high static loads and dynamic loads, it can be used in harsh environments with large temperature changes. If it is used under high conditions, it will cause axial swelling due to the large linear expansion coefficient of the plastic material.

Contents of the invention

The purpose of the present disclosure is to provide a plastic nut that not only has good self-lubricating performance and does not require frequent oiling, but also can not axially swell in the severe temperature environment with large temperature difference and under the condition of large load. For slotted pushrod devices.

In order to solve the above problems, the technical solution to achieve the purpose of the present disclosure is a split-slotted push rod device using plastic nuts, including an input shaft, an upper casing, a lower casing, a transmission device, a screw rod, a plastic nut and a metal nut. The upper casing and the lower casing 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, and the input shaft has a The exposed end of the outside of the reduction box body, and the extension end located inside the reduction box body, the extension end of the input shaft is a pinion shaft or worm, and the pinion shaft or worm shaft at the input shaft extension end is respectively connected to the The first stage gear or worm gear of the transmission device meshes, and the final stage gear or worm wheel of the transmission device is fixedly connected or integrated with the screw rod to drive the screw rod to rotate, and the plastic nut is screw mounted on the screw rod. On the screw rod, and one end of the metal pipe is fixedly connected with the plastic nut, and when the screw rod rotates, it drives the plastic nut to perform reciprocating linear motion on the screw rod; the improvement lies in:

1), the plastic nut is a pair of slotted plastic nut structure, that is, the plastic nut is formed with an inner circumferential groove on the inner wall surface and an outer circumferential groove on the outer wall surface, and the inner circumferential groove of the plastic nut At least one pair or n pairs of inner peripheral ring grooves and outer peripheral ring grooves whose axial positions are the same or offset from each other are arranged on the wall surface and the outer wall surface at the same time, where n is a positive integer and n≥1 ;In each pair of slots, the central section (O1-O1, O2-O2, ..., On-On) of each inner peripheral ring groove is the same as the axial position of its pair or the outer peripheral ring grooves whose axial positions are offset from each other The axial distance between the central sections (O1'-O1', O2'-O2', ..., On'-On') is (J1, J2, ..., Jn), and the axial distances J1, J2, ..., Jn meet the following conditions:

0≤J1≤(0.5H1+5+0.5H1')mm,

0≤J2≤(0.5H2+5+0.5H2')mm,

...,

0≤Jn≤(0.5Hn+5+0.5Hn')mm;

2), the lengths (L1, L2, ..., Ln+1) of the ring sections (D1, D2, ..., Dn+1) of the inner peripheral walls formed by cutting the pair of slotted plastic nut structures are all ≤ 80mm ; The length (L1', L2', ..., Ln+1') of each segment of the outer peripheral wall ring segment (D1', D2', ..., Dn+1') formed by cutting the grooved plastic nut structure ) are ≤80mm;

3) The groove width (H1, H2, ..., Hn) of each inner circumferential groove is greater than 0.05mm; the groove width (H1', H2', ..., Hn') of each outer circumferential groove is greater than 0.05mm;

4) The radial wall thickness or radial distance between the groove bottoms of the inner peripheral ring grooves and the outer peripheral ring grooves of each pair of grooves is γ≤3.0mm.

Further, the external thread of each outer peripheral wall annular section (D1', D2', ..., Dn+1') of the pair of slotted plastic nut structures is fixedly connected with the metal pipe thread at the same time; or the pair of slots Each peripheral wall annular section (D1', D2', ..., Dn+1') of the type plastic nut structure is fixedly connected with one end pin and/or screw of the metal pipe at the same time; or the pair of slotted plastic nut structures In each of the outer peripheral wall ring segments (D1', D2', ..., Dn+1'), some of the peripheral wall ring segments are fixedly connected with one end of the metal tube with pins and/or screws, while the rest of the peripheral wall ring segments are connected with the metal tube One end of the threaded connection.

Further, the major diameter Ф2 of the external thread of the screw rod is between 15 and 35 mm, the outer diameter Ф4 of the matching plastic nut is between 30 and 50 mm, and the total length E2 of the plastic nut is between 50 and 50 mm. ~200mm.

Further, it also has a drive motor, the drive motor is fixedly connected to the lower housing, the drive shaft of the drive motor is the input shaft of the reduction box body, and the motor end cover of the drive motor has a An integrally formed annular boss, the input shaft of the driving motor is equipped with a cap, the shape of the central hole of the cap matches the cross-sectional shape of the corresponding fitting part of the input shaft, and the cap has a A groove matching the annular boss of the end cover, and the cap and the annular boss of the motor end cover form a labyrinth oil-repelling structure.

Further, the reduction box body is provided with a housing installation head or a metal dust-proof pipe with a housing installation head, and the other end of the metal pipe is provided with a pipe wall connection hole or is fixedly connected with the metal pipe installation head.

Further, the reduction box body is fixedly connected with a housing installation head, and the other end of the metal pipe is fixedly connected with a metal pipe installation head, and the metal pipe installation head and the housing installation head are respectively located in the reduction box sides of the body.

Further, the transmission device is a three-stage gear transmission mechanism or a one-stage worm gear transmission mechanism.

Further, the helix angle Ψ of the inner thread of the plastic nut is ≤ 2.90°, and the screw rod has an outer thread matching the helix angle Ψ of the inner thread of the plastic nut.

The beneficial effect of the present disclosure is that the slotted push rod device using plastic nuts has good self-lubricating performance and does not require frequent refueling, so that it does not need to add lubricating grease again during the entire life cycle It can move smoothly with the screw rod in the process of screw transmission. It can also be used in severe temperature environments with large temperature differences and under the conditions of large static loads and dynamic loads. At the same time, it adopts the technical solution of splitting grooves on the plastic nuts. The plastic nuts are cut into successively connected pieces similar to Segment-shaped structure has a pair of slotted plastic nut structures with an outer peripheral wall ring segment and an inner peripheral wall ring segment, and the length of each segment of the cut segment-like structure of the slotted plastic nut structure becomes shorter, so the length becomes shorter. The short single-segment annular section of the outer peripheral wall and the annular section of the inner peripheral wall will have a smaller deformation in the harsh temperature environment with a large temperature difference, even if the plastic nut is in the harsh temperature environment between -30°C and 70°C Under the use, the problem of axial swelling will not occur between the plastic nut and the screw rod. Since the copper nut is replaced by the plastic nut, the production cost can be greatly reduced and the efficiency can be improved. In particular, the present disclosure can adapt to large-scale production, satisfy the market demand to the greatest extent, and double the benefit of the enterprise. At the same time, it can generate a lot of great social and economic benefits.

The split-slotted push rod device with plastic nut not only has good self-lubricating performance and does not require frequent oiling, but also can not axially swell in severe temperature environments with large temperature differences and under heavy loads. Not only is it especially suitable for the lifting and/or angle adjustment function of the push rod device of the solar power tracking bracket under the severe temperature environment with large temperature difference and large load, but also suitable for special environments and occasions, Such as scientific experiments, polar expeditions, deep-sea exploration, desert or red tropical environment, etc.

Description of drawings

Fig. 1 is a schematic diagram of the first overall structural form of the slotted push rod device adopting plastic nuts of the present disclosure;

Fig. 2 is a partially cutaway schematic view of the first overall structural form of the slotted push rod device adopting plastic nuts of the present disclosure;

Fig. 3 is a partial cutaway schematic diagram of the oil blocking structure of the first overall structural form of the slotted push rod device using plastic nuts of the present disclosure;

Fig. 4 is the first kind of overall structural form of the oil blocking structure of the present disclosure adopting plastic nuts to the slotted push rod device in Fig. 3, which is partially cut and enlarged schematic diagram of part I;

5 is a schematic diagram of the first oil-blocking structure of the first overall structural form of the oil-blocking structure of the slotted push rod device using plastic nuts in the present disclosure;

6 is a schematic diagram of the second oil-blocking structure of the first overall structural form of the oil-blocking structure of the grooved push rod device using plastic nuts in the present disclosure;

Fig. 7 is a schematic diagram of the installation of the input shaft and the lower casing of the first overall structural form of the oil-repelling structure of the slotted push rod device using plastic nuts in the present disclosure;

Fig. 8 is a cross-sectional structural schematic diagram of the plastic nut screwed on the switch contact ring of the first type of grooved push rod device adopting plastic nuts in which the outer wall surface and the inner wall surface are bidirectionally opened to form circumferential ring grooves;

Fig. 9 is a cross-sectional view showing the ring section of the outer peripheral wall of the first type of split-slotted push rod device using plastic nuts in the present disclosure. The outer wall surface and the inner wall surface bidirectionally split the circumferential ring groove of the plastic nut screwed on the metal pipe. ;

Fig. 10 is a cross-sectional view showing the ring section of the inner peripheral wall of the first type of split-slotted push rod device using plastic nuts in the present disclosure. The outer wall and inner wall of the two-way split circumferential ring groove plastic nut screwed on the metal pipe ;

Fig. 11 is a schematic diagram of the cut-away structure of the plastic nut of the first kind of outer wall surface and inner wall surface of the double-slotted push rod device adopting plastic nuts of the present disclosure, which are bidirectionally divided into circumferential ring grooves;

Fig. 12 is a schematic diagram of part II of the partially enlarged structure of the plastic nut of the first kind of outer wall surface and inner wall surface bidirectionally split circumferential ring grooves of the split-groove push rod device of the present disclosure using plastic nuts in Fig. 11;

Fig. 13 is a cross-sectional schematic diagram of a plastic nut with two-way split circumferential grooves on the outer wall and inner wall of the split-groove push rod device of the present disclosure;

Fig. 14 is a schematic diagram of Part III of the partially enlarged structure of the plastic nut of the double-slotted push rod device adopting plastic nuts of the present disclosure in Fig. 13, the second outer wall surface and inner wall surface bidirectionally split the circumferential ring groove;

Fig. 15 is a schematic diagram of the cut-away structure of the plastic nut of the third kind of outer wall surface and inner wall surface of the double-slotted push rod device adopting plastic nuts of the present disclosure, which are bidirectionally divided into circumferential ring grooves;

Fig. 16 is a schematic diagram of part IV of the partially enlarged structure of the plastic nut of the double-slotted push rod device of the present disclosure adopting plastic nuts in Fig. 15;

Fig. 17 is a schematic diagram of the cross-sectional structure of the plastic nut of the fourth kind of outer wall and inner wall of the double-slotted push rod device adopting plastic nuts of the present disclosure, which are bidirectionally split into circumferential ring grooves;

Fig. 18 is a schematic diagram of a partially enlarged structure of the V part of the plastic nut of the fourth kind of outer wall and inner wall of the double-slotted push rod device of the present disclosure in Fig. 17 with two-way split circumferential grooves;

Fig. 19 is a schematic diagram of the cross-sectional structure of the plastic nut of the fifth kind of outer wall surface and inner wall surface bidirectionally split circumferential ring grooves of the double-slotted push rod device adopting plastic nuts of the present disclosure;

Fig. 20 is a schematic diagram of part VI of the partially enlarged structure of the plastic nut of the double-slotted push rod device of the present disclosure adopting plastic nuts in Fig. 19, with the outer wall and inner wall bidirectionally split in circumferential grooves;

Fig. 21 is a schematic diagram of the second overall structure of the slotted push rod device using plastic nuts of the present disclosure;

Fig. 22 is a schematic diagram of the third overall structure of the slotted push rod device using plastic nuts of the present disclosure;

Fig. 23 is a structural schematic diagram of the third overall structure of the slotted push rod device adopting plastic nuts cut along the A-A direction of the present disclosure;

Fig. 24 is a schematic diagram of the fourth overall structure of the slotted push rod device using plastic nuts of the present disclosure;

Fig. 25 is a structural schematic diagram of the fourth overall structure of the slotted push rod device adopting plastic nuts cut along the B-B direction;

Fig. 26 is a schematic diagram of the nut helix angle of the slotted push rod device adopting plastic nuts of the present disclosure;

Fig. 27 is a schematic structural diagram of a plastic nut with two-way split circumferential grooves on the outer wall and inner wall of the split-groove push rod device of the present disclosure;

Fig. 28 is a schematic structural diagram of a second type of plastic nut with two-way split circumferential grooves on the outer wall and inner wall of the split-groove push rod device using plastic nuts of the present disclosure.

In the picture:

Drive motor 100, input shaft 120, exposed end of output shaft 121, upper housing 200, lower housing 300, transmission device 400, screw rod 500, nut 600, inner circumferential groove 603, outer circumferential groove 604, switch contact ring 700 , metal pipe 800, shell installation head 901, metal pipe installation head 902, inner peripheral wall annular section D1, inner peripheral wall annular section D2, inner peripheral wall annular section D3, inner peripheral wall annular section D4, outer peripheral wall annular section D1', outer peripheral wall An annular segment D2', an annular segment D3' of the outer peripheral wall, and an annular segment D4' of the outer peripheral wall.

Detailed ways

The technical solution of the present disclosure will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present disclosure.

Embodiment one:

As shown in Fig. 1 to Fig. 4, Fig. 8 to Fig. 22, Fig. 24, Fig. 27 and Fig. 28, it is a split-slotted push rod device using plastic nuts according to the present disclosure, including an input shaft 120, an upper housing 200, the lower casing 300, the transmission device 400, the screw rod 500, the plastic nut 600 and the metal pipe 800, the upper casing 200 and the lower casing 300 are fixedly connected to form a reduction box and form the transmission device 400 space, 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, so The protruding end of the input shaft 120 is a gear shaft or a worm, and the pinion or worm at the protruding end of the input shaft 120 meshes with the first stage gear or worm wheel of the transmission device 400 respectively, and the end of the transmission device 400 The stage gear or worm wheel is fixedly connected or integrated with the screw rod 500 to drive the screw rod 500 to rotate. The plastic nut 600 is screw mounted on the screw rod 500, and one end of the metal tube 800 is connected to the screw rod 500. The plastic nut 600 is fixedly connected, and when the screw mandrel 500 rotates, the plastic nut 600 is driven to perform a reciprocating linear motion on the screw mandrel 500. The improvement lies in:

1), the plastic nut 600 is a pair of grooved plastic nut structure, that is, the plastic nut 600 is formed with an inner peripheral ring groove 603 on the inner wall surface and an outer peripheral ring groove 604 on the outer wall surface, and the At least one pair or n pairs of inner peripheral ring grooves 603 and their paired outer peripheral ring grooves 604 with the same axial position or offset from each other are formed on the inner wall surface and the outer wall surface of the plastic nut 600 at the same time, wherein n is a positive integer and n≥1; in each pair of slots, the central section (O1-O1, O2-O2, ..., On-On) of each inner peripheral ring groove 603 and its paired axial position are the same or the axial positions are mutually opposite. The axial distance between the center sections (O1'-O1', O2'-O2', ..., On'-On') of the offset outer circumferential grooves 604 is (J1, J2, ..., Jn), And the axial distances J1, J2,..., Jn meet the following conditions:

0≤J1≤(0.5H1+5+0.5H1')mm,

0≤J2≤(0.5H2+5+0.5H2')mm,

...,

0≤Jn≤(0.5Hn+5+0.5Hn')mm;

3) The groove widths (H1, H2, ..., Hn) of each inner circumferential groove 603 are greater than 0.05mm; the groove widths (H1', H2', ..., Hn') of each outer circumferential groove 604 are greater than 0.05mm ;

4) The radial wall thickness or the radial distance between the groove bottoms of the inner peripheral ring groove 603 and the outer peripheral ring groove 604 of each pair of grooves is γ≤3.0 mm.

In the present disclosure, the reduction box encloses the transmission device 400 in the space enclosed by the upper housing 200 and the lower housing 300, and the input shaft 120 and the exposed end 121 can be an integral structure, or can be Separated installation into one structure, the input shaft 120 protrudes into the space enclosed by the upper casing 200 and the lower casing 300, the end of the input shaft 120 is a spur shaft and is connected to the The first-stage spur gears of the transmission 400 are in mesh with each other; or the end of the input shaft 120 is a helical gear and is in mesh with the first-stage helical gear of the transmission 400; or the end of the input shaft 120 is a worm And mesh with the first stage worm gear of the transmission device 400 . The metal tube 800 and the plastic nut 600 can be connected by but not limited to threaded connection, pin connection, screw connection, circlip connection and other ways to make the two fixedly connected as one. When threaded, the plastic nut 600 can also be fixedly connected with the metal pipe 800 by using thread fastening glue or anaerobic glue on the threaded contact part of the metal pipe 800 to realize the positioning of the plastic nut 600 inside the metal pipe 800 .

As shown in Fig. 8 to Fig. 11, Fig. 13, Fig. 15, Fig. 17 and Fig. 19, in the split-slotted push rod device using plastic nuts of the present disclosure, the plastic nut 600 as a whole bears a dynamic load of 1 to 2 tons When the total length E2 is between 50 ~ 200mm. When the plastic nut 600 bears a dynamic load of 1 ton, the total length E2 is between 50 and 150mm, and all slotted plastic nuts within the size range of the total length can bear an overall dynamic load of 1 ton, and a static load of 3 tons or above; When the plastic nut 600 bears a dynamic load of 2 tons, the total length E2 is between 100 and 200 mm. All slotted plastic nuts within the size range of this total length can withstand an overall dynamic load of 2 tons and a static load of 5 to 10 tons.

As shown in Fig. 1, Fig. 2, Fig. 8, Fig. 9, Fig. 21, Fig. 22, and Fig. 24, in the split-slot push rod device adopting plastic nuts of the present disclosure, the plastic nut 600 is a split-slot type The plastic nut structure, that is, the plastic nut 600 is formed with an inner peripheral ring groove 603 on the inner wall surface and an outer peripheral ring groove 604 on the outer wall surface at the same time, and each outer peripheral wall formed by cutting the grooved plastic nut structure The external threads of the annular segments (D1', D2', ..., Dn+1') are fixedly connected with the metal pipe 800 at the same time; or the annular segments of the outer peripheral wall formed by cutting the grooved plastic nut structure D1', D2', ..., Dn+1') are fixedly connected with one end of the metal pipe 800 by pins and/or screws at the same time; or the ring segments of the outer peripheral wall formed by cutting the grooved plastic nut structure ( In D1', D2', ..., Dn+1'), part of the annular section of the peripheral wall is fixedly connected with one end of the metal pipe 800 by pins and/or screws, while the rest of the annular section of the peripheral wall is fixedly connected with one end of the metal pipe 800 by threads .

As shown in Fig. 8 to Fig. 11, Fig. 13, Fig. 15, Fig. 17, Fig. 19, and Fig. 26, the major diameter Ф2 of the external thread of the screw rod 500 is between 15 and 35 mm, and the matched The major diameter Ф4 of the internal thread of the plastic nut 600 is between 30 mm and 50 mm. The supporting selection of the screw rod 500 and the plastic nut 600 can make the plastic nut 600 still have good comprehensive mechanical properties in a severe temperature environment with a large temperature difference, so that it can bear a large static load, Dynamic load capacity. The total length E2 of the plastic nut 600 is between 50mm and 200mm.

As shown in Fig. 1, Fig. 2, Fig. 3, Fig. 8, Fig. 9, Fig. 21, Fig. 22, Fig. 23, Fig. 24, and Fig. 25, in the split-slot push rod device adopting plastic nuts of the present disclosure, the A switch contact ring 700 is screwed and fixed on the part of the plastic nut 600 exposed at one end of the metal tube 800 , or a switch contact ring 700 is screwed and fixed at one end of the metal tube 800 . In order to prevent the nut 600 from being separated from the switch contact ring 700 or the metal tube 800 , anaerobic glue or thread fastening glue is applied to the joint where the two are screwed together for fixed connection. The switch contact ring 700 is equipped with a switch for starting the drive motor 100 in the electric push rod device. The moving parts touch the switch device on the switch contact ring 700, so that the drive motor 100 is energized and rotated to start, and the input shaft 120 drives the transmission device 400 to rotate, so that the screw rod 500 rotates, and then the drive is threaded and fixed with the metal tube 800 The connected nut 600 realizes the reciprocating linear motion, so as to realize the function of lifting and/or adjusting the angle of the external mechanism by the whole electric push rod device.

As shown in Fig. 1, Fig. 3, Fig. 4, Fig. 5, Fig. 6, and Fig. 7, in the split-slotted push rod device adopting plastic nuts of the present disclosure, there is also a driving motor 100, and the driving motor 100 is connected with the The lower housing 300 is fixedly connected, the drive shaft of the drive motor 100 is the input shaft 120 of the reduction box body, and the outer end surface of the motor end cover 110 of the drive motor 100 has an integrally formed annular boss 111, The input shaft 120 of the drive motor 100 is equipped with a block cap 130, the shape of the central hole of the block cap 130 matches the cross-sectional shape of the corresponding matching part of the input shaft 120, and the block cap 130 has a The groove that matches the annular boss 111 of the cover 110 , the cap 130 and the annular boss 111 of the motor end cover 110 form a labyrinth oil-repelling structure. The shape of the central hole of the cap 130 is toothed or circular, which is consistent with the toothed or circular shape of the cross-section of the corresponding matching part of the input shaft 120. The cap 130 and the input shaft 120 have adopted Fitting, the groove of the cap 130 and the annular boss 111 of the motor end cover 110 have a gap to form a space separation, the separation gap can be between 0.2-0.5 mm, and the separation gap of 0.2-0.5 mm can be The block cap 130 that is installed as a whole with an interference fit on the input shaft 120 of the drive motor 100 will not rub against the annular boss 111 under the rotation of the input shaft 120, and will not cause damage to the drive motor 100. Jamming of motor 100 rotation. At the same time, the cap 130 and the annular boss 111 form an oil-repelling structure that can prevent the lubricating grease from flowing from the reduction box to the inside of the drive motor, which solves the problem that the lubricating grease penetrates into the inside of the drive motor along the drive shaft of the drive motor .

As shown in Fig. 1, Fig. 3, Fig. 4, Fig. 5, Fig. 6, and Fig. 7, in the split-slotted push rod device adopting plastic nuts of the present disclosure, the cap 130 is interference fit with the input shaft 120 , the cap 130 has an umbrella-shaped structure, and the cap 130 holds a gap covering or partially covering 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 driving motor 100 is engaged with the first-stage spur shaft, helical gear shaft or worm gear of the transmission device 400 for transmission, since the cover 130 covers or partially covers the outside the annular boss 111 of the motor end cover 110, so that the lubricating grease between the transmission device 400 and the input shaft 120 for realizing the lubricating function is blocked outside the cover 130, and along the The outer surface of the umbrella-shaped structure of the cap 130 flows into the annular cavity space formed by connecting the motor end cover 110 and the lower housing 300, and the annular boss 111 inside the cap 130 is connected with the cap 130 forms a stepped labyrinth structure, even if the lubricating grease in the annular cavity space formed by connecting the motor end cover 110 and the lower housing 300 exceeds the height of the cap 130, due to the stepped labyrinth The structure and the existence of the centrifugal force of the cap 130 and the annular boss 111 on the adhered grease still prevent the lubricating grease from flowing into the upper part of the annular boss 111 of the input shaft 120, so that the cap 130 and the annular The oil-blocking structure formed by the boss 111 can prevent the lubricating grease from flowing from the reduction box to the inside of the drive motor, which solves the problem that the lubricating grease infiltrates into the inside of the drive motor along the drive shaft of the drive motor in the prior art.

As shown in Fig. 1, Fig. 3, Fig. 4, Fig. 5, Fig. 6, and Fig. 7, in the split-slotted push rod device adopting plastic nuts of the present disclosure, the outer circumference of the cap 130 is circular Or polygonal structure, the shape of the central hole of the cap 130 is an inner gear ring or a circle. The annular boss 111 matching the cap 130 to form a labyrinth oil-repelling structure also has a circular or polygonal structure. The shape of the central hole of the cap 130 matches the cross-section of the corresponding matching part of the input shaft 120, and at the same time, the diversity of the central hole shapes of the cap 130 can make the cap 130 suitable for and matched with input shafts 120 of different shapes. , and is suitable for motor end caps 110 with different types of annular bosses 111, its versatility is wider, and the structure can be selected according to different motor end caps 110, which is more conducive to the connection between the cap 130 and the motor end cap 110 of the annular boss 111 match.

As shown in Fig. 1, Fig. 3, Fig. 4, Fig. 5, Fig. 6, and Fig. 7, in the split-slotted push rod device adopting plastic nuts of the present disclosure, the cap 130 is made of engineering plastic or metal, and the 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 combinations of materials as follows: 1. The materials of the cap 130 and the motor end cap 110 are both metal materials; 2. The motor end cover 110 is made of metal, and the cap 130 is made of engineering plastics. The combination of dissimilar materials can achieve the best anti-friction effect. When the drive motor 100 drives the cap 130 on the input shaft 120 to rotate, even if the cap 130 is connected to the motor end cover 110 The annular boss 111 generates friction, and the cap 130 will not be worn excessively, causing the cap 130 to be damaged.

As shown in Fig. 1, Fig. 2, Fig. 3, Fig. 21, Fig. 22, and Fig. 24, in the split-slotted push rod device using plastic nuts of the present disclosure, the reduction box is provided with a housing installation head 901 Alternatively, a metal dust-proof pipe with a housing installation head 901 is provided, and the other end of the metal pipe 800 has a pipe wall connection hole or is fixedly connected with the metal pipe installation head 902 . Specifically, the housing installation head 901 is installed on the upper housing 200 of the deceleration box or the housing installation head 901 is installed on the lower housing 300 of the deceleration box; or the deceleration box The upper housing 200 of the housing is integrated with the housing installation head 901 or the lower housing 300 of the reduction box is integrated with the housing installation head 901; or the housing installation head 901 is located at the same The reduction box body is installed and connected to the integrated metal dust-proof pipe, or is located on the parts connected to the reduction box body. The shell mounting head 901 can be used to connect the fixed end of the external mechanism, and the metal pipe mounting head 902 can be used to connect the moving end of the external mechanism, and vice versa.

As shown in Fig. 1, Fig. 2, Fig. 3, Fig. 4, Fig. 21 to Fig. 25, in the split-slotted push rod device using plastic nuts of the present disclosure, the reduction box is fixedly connected to the housing installation head 901 Above, the other end of the metal pipe 800 is fixedly connected with a metal pipe installation head 902, and the metal pipe installation head 902 and the housing installation head 901 are respectively located on both sides of the reduction box body. The transmission device 400 is a three-stage gear transmission mechanism or a one-stage worm gear transmission mechanism. Of course, it can also be converted to a metal dust-proof pipe with a housing installation head 901 on the reduction box body, and the other end of the metal pipe 800 has a pipe wall connection hole, so that it is suitable for the position compact occasions. The transmission device 400 can also be a gear transmission mechanism with no less than two stages or a one-stage or multi-stage worm gear transmission mechanism. Such a transmission device 400 can realize a simplified structure under the premise of satisfying the transmission function, wherein it is preferably to adopt a three-stage gear transmission mechanism or a one-stage worm gear transmission mechanism; Reach optimally make screw mandrel 500 drive nut 600 lift and realize the function of electric push rod device, also can choose to adopt two-stage or four-stage gear transmission mechanism or two-stage worm gear transmission mechanism.

As shown in Fig. 1, Fig. 3, Fig. 4, Fig. 5, Fig. 6, Fig. 7, Fig. 21, Fig. 23, and Fig. 25, in the split-slot push rod device adopting plastic nuts of the present disclosure, the input shaft The exposed end 121 of 120 is connected with 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 is a square shaft, hexagonal shaft, flat or spline shaft structure. The exposed end 121 in various structural forms can be adapted to external manual control or electric control mechanisms in various structural forms, which has the advantage of high assembly or matching stability, and has the replaceability of the input shaft 120 in various forms of exposed end 121 Strong, more suitable for mass production, and can better realize the transmission of external power to the transmission device 400 through the input shaft 120, and improve the stability of the push rod device.

As shown in FIG. 26 , in the double-slotted push rod device using plastic nuts of the present disclosure, the helix angle Ψ≤2.90° of the internal thread of the plastic nut 600 , and the screw rod 500 has a The helix angle Ψ of the internal thread of the nut 600 matches the external thread. The helix angle Ψ can only be selected when it is less than or equal to 2.90°. When the external ambient temperature reaches 70°C, the plastic nut 600 in the self-locking push rod device still has the self-locking function on the screw 500; when the helix angle Ψ is greater than 2. In the case of 90°, when the external ambient temperature reaches 70°C, the plastic nut 600 in the self-locking push rod device will no longer have the self-locking function on the screw rod 500. The self-locking push rod device has good self-lubricating performance and does not require frequent oiling due to the use of plastic nuts, so that it can move with the screw rod during screw transmission without adding lubricating grease again during the entire life cycle smooth. At the same time, because the helix angle of the internal thread of the plastic nut used is Ψ≤2.90°, and the screw rod has an external thread that matches the helix angle Ψ of the internal thread of the plastic nut, the internal thread and the internal thread of the plastic nut are reduced. The helix angle of the external thread of the screw rod, in the harsh temperature environment with a large temperature difference and under the condition of a large load, the plastic nut and the screw rod are used for screw transmission to make the self-locking push rod device reach the set lifting height And/or after the angular position, the small helix angle of the plastic nut can self-lock the screw and has a high self-locking ability, that is, when the driving force is lost and the axial load continues to exist, the screw will also There will be no relative rotation in the plastic nut and it can self-lock the screw rod well, so that the whole push rod device can be well maintained at the set lifting height and/or angle position without causing equipment and safety problems. ACCIDENT.

As shown in Fig. 1, Fig. 2, Fig. 8 to Fig. 11, Fig. 13, Fig. 15, Fig. 17, Fig. 19, Fig. 21, Fig. 22, and Fig. 24, the double slotted push rod device using plastic nuts of the present disclosure Among them, the plastic nut 600 is a split-slotted plastic nut with 4 circumferential wall ring segments, and the outer circumferential wall ring segments D1', D2', ..., D4 of the split-slotted plastic nut structure of the 4 circumferential wall ring segments 'At the same time, it is fixedly connected with the metal pipe 800 by threads. It can also be that each of the outer peripheral wall annular segments D1', D2',..., D4' of the four-section peripheral wall ring segment with a grooved plastic nut structure is fixedly connected to the metal pipe 800 with pins, and splits Between the annular sections D1', D2', ..., D4' of the grooved plastic nut structure and the metal pipe 800, the reliability of the fixed connection between the two can be enhanced by adding adhesive glue; or 4 Each of the ring segments D1', D2', ..., D4' of the ring segment of the ring segment of the ring wall of the segment wall is fixedly connected with the metal pipe 800 through a threaded connection, and the slotted plastic nut structure Between the annular sections D1', D2', ..., D4' of the outer peripheral wall of the type plastic nut and the metal pipe 800, the reliability of the fixed connection between the two can be enhanced by adding adhesive glue.

As shown in FIG. 27 , it is a structural schematic diagram of the first type of plastic nut in which the outer wall surface and the inner wall surface bidirectionally split the circumferential ring groove in the double-slotted push rod device adopting plastic nuts of the present disclosure. The plastic nut 600 is simultaneously opened. The inner peripheral annular groove 603 on the inner wall surface and the outer peripheral annular groove 604 on the outer wall surface are formed, and at least n pairs of inner peripheral annular grooves 603 and their pairs are split on the inner wall surface and the outer wall surface of the plastic nut 600 at the same time The outer peripheral ring grooves 604 with the same axial position, where n is a positive integer and n≥1; in the split groove structure of the plastic nut 600 shown in the figure, the groove widths H1, H2, and The center sections O1-O1, O2-O2,..., On-On of ..., Hn and the center sections O1'-O1', O2'- O2',..., On'-On' have the same axial position, that is, the central sections of the inner circumferential groove 603 and the outer circumferential groove 604 are located on the same plane, and the positions of the inner circumferential groove 603 and the outer circumferential groove 604 Right on top. Each of the inner peripheral ring grooves 603 on the inner wall surface has a paired outer peripheral ring groove 604 on the outer wall surface with the same axial position to form a pair of grooves. The lengths L1, L2, ..., Ln+1 of the annular segments D1, D2, ..., Dn+1 of the inner peripheral wall of each section and the length L1', L1', D2', ..., Dn+1' of the annular sections of the outer peripheral wall of each section L2', ..., Ln+1' are all ≤ 80mm; the groove widths H1, H2, ..., Hn of each inner circumferential groove 603 and the groove widths H1', H2', ..., Hn' of each outer circumferential groove 604 are greater than 0.05mm; the radial wall thickness between each pair of slotted inner peripheral ring grooves 603 and the groove bottom of the outer peripheral ring groove 604 is γ≤3.0mm; the groove widths H1, H2, ..., of each inner peripheral ring groove 603 The center sections O1-O1, O2-O2,..., On-On of Hn and the center sections O1'-O1', O2'-O2' of the groove widths H1', H2',..., Hn' of each peripheral ring groove 604 , ..., On'-On', the axial distances J1, J2, ..., Jn are all zero.

As shown in FIG. 28 , it is a schematic diagram of the structure of the second type of plastic nut in which the outer wall surface and the inner wall surface bidirectionally split the circumferential ring groove in the double-slotted push rod device using a plastic nut. The plastic nut 600 is simultaneously opened. The inner peripheral annular groove 603 on the inner wall surface and the outer peripheral annular groove 604 on the outer wall surface are formed, and at least n pairs of inner peripheral annular grooves 603 and their pairs are split on the inner wall surface and the outer wall surface of the plastic nut 600 at the same time The axial positions of the outer circumferential grooves 604 are offset from each other, where n is a positive integer and n≥1; the figure shows the groove width H1 of each inner circumferential groove 603 in the split groove structure of the plastic nut 600 , H2,..., Hn central section O1-O1, O2-O2,..., On-On and the groove width H1', H2',..., Hn' central section O1'-O1', O2'-O2',..., On'-On' are mutually offset in axial position, that is, the central sections of the inner peripheral ring groove 603 and the outer peripheral ring groove 604 are located on two sides parallel to each other and with a certain offset. On this plane, the axial positions of the central section of the inner peripheral ring groove 603 and the outer peripheral ring groove 604 have a certain offset. Each of the inner peripheral ring grooves 603 on the inner wall surface has a pair of outer peripheral ring grooves 604 on the outer wall surface that are axially offset from each other to form a pair of grooves. The lengths L1, L2, ..., Ln+1 of the annular segments D1, D2, ..., Dn+1 of the inner peripheral wall of each section and the length L1', L1', D2', ..., Dn+1' of the annular sections of the outer peripheral wall of each section L2', ..., Ln+1' are all ≤ 80mm; the groove widths H1, H2, ..., Hn of each inner circumferential groove 603 and the groove widths H1', H2', ..., Hn' of each outer circumferential groove 604 are greater than 0.05mm; the radial distance between the groove bottoms of the inner peripheral ring grooves 603 and the outer peripheral ring grooves 604 of each pair of grooves is γ≤3.0mm; the groove widths H1, H2, ..., Hn of each inner peripheral ring groove 603 The center sections O1-O1, O2-O2,..., On-On and the center sections O1'-O1', O2'-O2', The axial distances J1, J2, ..., Jn between ..., On'-On' meet the following conditions:

0≤J1≤(0.5H1+5+0.5H1')mm,

0≤J2≤(0.5H2+5+0.5H2')mm,

...,

0≤Jn≤(0.5Hn+5+0.5Hn') mm.

Claims

A split-groove push rod device using plastic nuts, comprising an input shaft (120), an upper casing (200), a lower casing (300), a transmission device (400), a screw rod (500), a plastic nut ( 600) and a metal pipe (800), the upper casing (200) and the lower casing (300) are fixedly connected to form a reduction box and form a space for accommodating the transmission (400), and the transmission ( 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) The extending end of the 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 meshed with the first stage gear or worm gear of the transmission (400), and the transmission The final gear or worm wheel of the device (400) is fixedly connected or integrated with the screw rod (500) to drive the screw rod (500) to rotate, and the plastic nut (600) is screw mounted on the screw rod ( 500), and one end of the metal pipe (800) is fixedly connected to the plastic nut (600), and when the screw mandrel (500) rotates, it drives the plastic nut (600) to rotate on the screw mandrel (500) Do reciprocating linear motion; it is characterized in that:

1), the plastic nut (600) is a grooved plastic nut structure, that is, the plastic nut (600) is simultaneously formed with an inner peripheral ring groove (603) on the inner wall surface and an outer peripheral ring groove on the outer wall surface. slots (604), and at least one pair or n pairs of inner circumferential grooves (603) and their paired axial positions are the same or axial positions Outer peripheral ring grooves (604) offset from each other, wherein n is a positive integer and n≥1; in each pair of slots, the central sections (O1-O1, O2-O2,..., On-On) and its matching axial position are the same or the axial positions are offset from each other. The central section of each outer peripheral ring groove (604) (O1'-O1', O2'-O2', ..., On'-On' ) is (J1, J2, ..., Jn), and each axial distance J1, J2, ..., Jn meets the following conditions:

0≤J1≤(0.5H1+5+0.5H1')mm,

0≤J2≤(0.5H2+5+0.5H2')mm,

...,

0≤Jn≤(0.5Hn+5+0.5Hn')mm;

2), the lengths (L1, L2, ..., Ln+1) of the ring sections (D1, D2, ..., Dn+1) of the inner peripheral walls formed by cutting the pair of slotted plastic nut structures are all ≤ 80mm ; The length (L1', L2', ..., Ln+1') of each segment of the outer peripheral wall ring segment (D1', D2', ..., Dn+1') formed by cutting the grooved plastic nut structure ) are ≤80mm;

3) The groove widths (H1, H2, ..., Hn) of each inner circumferential groove (603) are greater than 0.05mm; the groove widths (H1', H2', ..., Hn') of each outer circumferential groove (604) All greater than 0.05mm;

4) The radial wall thickness or radial distance between the groove bottoms of the inner peripheral ring groove (603) and the outer peripheral ring groove (604) of each pair of grooves is γ≤3.0mm.
The split-slotted push rod device using plastic nuts according to claim 1, characterized in that:

The external thread of each peripheral wall ring section (D1', D2', ..., Dn+1') of the pair of slotted plastic nut structures is fixedly connected with the metal pipe (800) by threads at the same time; or the split Each peripheral wall annular section (D1', D2', ..., Dn+1') of the grooved plastic nut structure is fixedly connected to one end of the metal pipe (800) with pins and/or screws at the same time; or the pair of grooves In each peripheral wall annular section (D1', D2', ..., Dn+1') of the type plastic nut structure, part of the peripheral wall annular section is fixedly connected with one end of the metal tube (800) by pins and/or screws, while the rest of the peripheral wall The ring segment is screwed and fixedly connected with one end of the metal pipe (800).
The split-slotted push rod device using plastic nuts according to claim 1, characterized in that: the large diameter Ф2 of the external thread of the screw rod (500) is between 15 and 35 mm, and the matched The outer diameter Φ4 of the plastic nut (600) is between 30-50mm, and the total length E2 of the plastic nut (600) is between 50-200mm.
The double-slotted push rod device using plastic nuts according to claim 1, characterized in that: it also has a drive motor (100), and the drive motor (100) is fixedly connected to the lower casing (300), The driving shaft of the driving motor (100) is the input shaft (120) of the reduction box body, and the outer end surface of the motor end cover (110) of the driving motor (100) has an integrally formed annular boss (111 ), the input shaft (120) of the drive motor (100) is equipped with a cap (130), the shape of the central hole of the cap (130) matches the cross-sectional shape of the corresponding fit of the input shaft (120) , the cap (130) has a groove that matches the annular boss (111) of the motor end cover (110), and the cap (130) is compatible with the annular boss (110) of the motor end The boss (111) forms a labyrinth oil-repelling structure.
The split-slotted push rod device using plastic nuts according to claim 1, characterized in that: the reduction box body is provided with a housing installation head (901) or is provided with a housing installation head (901) A metal dust-proof pipe, the other end of the metal pipe (800) is provided with a pipe wall connection hole or fixedly connected with the metal pipe installation head (902).
The double-slotted push rod device using plastic nuts according to claim 1, characterized in that: the reduction box body is fixedly connected with a housing installation head (901), and the other end of the metal pipe (800) is fixed A metal pipe installation head (902) is connected, and the metal pipe installation head (902) and the housing installation head (901) are respectively located on both sides of the reduction box body.
The split-slot push rod device using plastic nuts according to claim 1, characterized in that: the transmission device (400) is a three-stage gear transmission mechanism or a one-stage worm gear transmission mechanism.
The split-slotted push rod device using plastic nuts according to claim 1, characterized in that: the helix angle Ψ≤2.90° of the internal thread of the plastic nut (600), and the screw rod (500) It has an external thread matching the helix angle Ψ of the internal thread of the plastic nut (600).