Slotted Push Rod Device with Plastic Nut and Its Processing Method

Abstract

The present invention relates to a grooved push rod device using a plastic nut, which comprises an input shaft, an upper housing, a lower housing, a transmission device, a lead screw, a plastic nut and a metal tube. The plastic nut is a grooved plastic nut, and a circumferential annular groove or a helical groove is formed on the inner wall surface or the outer wall surface of the plastic nut. The remaining thickness H of the wall thickness between the bottom of the groove and the minor diameter of the external thread of the plastic nut is ≤ 4.0 mm, or the remaining thickness I of the wall thickness between the bottom of the groove and the major diameter of the internal thread of the plastic nut is ≤ 3.0 mm. The grooved plastic nut adopted by the present invention not only has good self-lubricating performance and does not need to be frequently refueled, but also will not be axially jammed under the harsh temperature environment with large temperature difference and under the condition of bearing large loads. It is particularly suitable for the push rod device of the solar power generation sun-tracking bracket and special environments and occasions such as scientific experiments, polar expeditions, deep-sea explorations, deserts, etc. The present invention also relates to a production method of a grooved push rod device using a plastic nut.

Description

Technical Field

[0001] The present invention belongs to the technical field of push rod devices, and particularly relates to a grooved push rod device using a plastic nut and a processing method thereof, especially a push rod device applicable to a solar power generation sun-tracking bracket and a processing method thereof. Background Art

[0002] The technology of using solar power generation devices for power generation is becoming more and more common globally. In order to maximize the utilization of solar energy by solar power generation devices, the existing technology realizes the lifting and / or real-time angle adjustment of the solar panels in the solar power generation device following different spatial angle positions of the sun through the use of a solar sun-tracking bracket, and the lifting and / or angle adjustment functions of the solar sun-tracking bracket are all realized by using a push rod device. Due to the harsh outdoor environment in which solar power generation devices are used, generally, they need to work under an environmental temperature of -30°C to 70°C, and solar power generation devices need to work in strong winds, and the force generated by the wind on the solar power generation device is relatively large. Therefore, this poses 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 be able to withstand a dynamic load of not less than 1 ton.

[0003] To ensure that the solar sun-tracking bracket can work normally under an environmental temperature of -30°C to 70°C, can withstand a static load of not less than 3 tons and a dynamic load of not less than 1 ton, and at the same time have a working life of not less than 5000 hours. For the push rod device that realizes the lifting and / or angle adjustment function of the solar sun-tracking bracket, its designed service life is required to reach more than 10,000 cycles of lifting and / or angle adjustment. Among them, the lead screw and the nut play a crucial role. To reduce the wear generated during the reciprocating spiral movement of the lead screw and the nut, generally, the lead screw is made of metal, but the nut usually uses more copper nuts and plastic nuts.

[0004] The copper nut has the following advantages: 1. When used in a harsh temperature environment with large temperature changes, the copper nut has high strength and can withstand large static and dynamic loads; 2. The copper nut has a small coefficient of linear expansion, and there will be no problem of axial seizure with the increase and decrease of the ambient temperature. However, the disadvantages of the copper nut are as follows: When the copper nut is used in a harsh temperature environment with large temperature changes, its self-lubricating ability is poor. Taking the lifting distance of the copper nut of 1 meter under a dynamic load of 1 ton as an example, the number of lifting times is less than 150 times. It is necessary to frequently add lubricating grease to ensure the smooth movement during the spiral transmission with the lead screw. If the lubricating grease is not added, when the number of lifting times reaches about 200 times, the lead screw can completely wear the copper nut, causing the entire push rod device to lose its working ability. Generally, there are thousands of push rod devices in a solar power plant, and the frequent addition of lubricating grease requires huge costs, manpower and material resources.

[0005] The advantages of the plastic nut are as follows: It has good self-lubricating performance. Adding lubricating grease once can meet the lubrication requirements throughout the life cycle, and it is not necessary to frequently add lubricating oil to ensure the smoothness of the spiral transmission with the lead screw. However, the plastic nut has the following disadvantages: The plastic material has poor strength and cannot withstand large static and dynamic loads. If the length of a single nut is increased to withstand higher static and dynamic loads and used in a harsh temperature environment with large temperature changes, axial seizure will occur due to the large coefficient of linear expansion of the plastic material. Summary of the Invention

[0006] The first object of the present invention is to provide a slotted push rod device using a plastic nut, which has good self-lubricating performance, does not require frequent refueling, and will not axially seize under harsh temperature environments with large temperature differences and under large loads.

[0007] The second object of the present invention is to provide a production method of a slotted push rod device using a plastic nut, which has good self-lubricating performance, does not require frequent refueling, and will not axially seize under harsh temperature environments with large temperature differences and under large loads.

[0008] To solve the above problems, the technical solution for achieving the first object of the present invention is a slotted push rod device using a plastic nut, which includes an input shaft, an upper housing, a lower housing, a transmission device, a lead screw, a plastic nut, and a metal tube. The upper housing and the lower housing are fixedly connected to form a reduction gearbox body and form a space for accommodating the transmission device. The transmission device is a gear transmission mechanism or a worm and worm gear transmission mechanism. The input shaft has an exposed end located outside the reduction gearbox body and an extending end located inside the reduction gearbox body. The extending end of the input shaft is a toothed shaft or a worm, and the toothed shaft or the worm at the extending end of the input shaft is respectively meshed with the first-stage gear or the worm of the transmission device. The last-stage gear or the worm of the transmission device is fixedly connected to or integrally formed with the lead screw to drive the lead screw to rotate. The plastic nut is helically installed on the lead screw, and one end of the metal tube is fixedly connected to the outer circumference of the plastic nut. When the lead screw rotates, it drives the plastic nut to perform a reciprocating linear motion on the lead screw. The improvement lies in:

[0009] 1), The plastic nut is a slotted plastic nut, and a circumferential ring groove or a spiral groove is formed on the inner wall surface or the outer wall surface of the plastic nut.

[0010] 2), When a circumferential ring groove is formed on the inner wall surface or the outer wall surface of the plastic nut:

[0011] a, The plastic nut is a ring groove type plastic nut structure, and the ring groove type plastic nut structure is composed of at least one or more circumferential ring grooves formed on the inner wall surface or the outer wall surface of the plastic nut.

[0012] b, The circumferential ring groove divides the plastic nut into at least two or more circumferential wall annular segments with their bases connected to each other, namely ring groove type plastic nuts D1, D2,..., D n , where n≥2 and n is a positive integer. The groove widths C1, C2,..., C of each circumferential ring groove n are all greater than 0.05 mm.

[0013] c, The length of each circumferential wall annular segment of the ring groove type plastic nuts D1, D2,..., D n is between 5 and 80 mm.

[0014] d, The remaining thickness H of the wall between the bottom of the circumferential ring groove and the minor diameter of the external thread of the ring groove type plastic nuts D1, D2,..., D n is ≤ 4.0 mm, or the remaining thickness I of the wall between the bottom of the spiral groove and the major diameter of the internal thread of the ring groove type plastic nuts D1, D2,..., D n is ≤ 3.0 mm.

[0015] e. Each circumferential wall annular segment of the annular groove type plastic nut is fixedly connected to the metal pipe simultaneously;

[0016] Or, when a helical groove is machined on the inner wall surface or the outer wall surface of the plastic nut:

[0017] a'. The plastic nut is of a helical groove type plastic nut structure, and the helical groove type plastic nut structure is a helical groove type plastic nut formed by machining at least one or more helical grooves on the inner wall surface or the outer wall surface of the plastic nut. The distance from one groove end of the helical groove to an adjacent end face of the helical groove type plastic nut is S1, and the distance from the other groove end to the other adjacent end face of the helical groove type plastic nut is S2, and S1 ≤ 80 mm, S2 ≤ 80 mm.

[0018] b'. The winding angle of the helical groove of the helical groove type plastic nut is greater than or equal to 360 degrees, and the groove width C of the helical groove is greater than 0.05 mm.

[0019] c'. The pitch S of the helical groove is between 5 and 80 mm.

[0020] d'. The remaining thickness H of the wall thickness between the bottom of the helical groove and the minor diameter of the external thread of the helical groove type plastic nut is ≤ 4.0 mm, or the remaining thickness I of the wall thickness between the bottom of the helical groove and the major diameter of the internal thread of the helical groove type plastic nut is ≤ 3.0 mm.

[0021] e'. The helical groove type plastic nut is fixedly connected to one end of the metal pipe.

[0022] Further, when a circumferential annular groove is machined on the inner wall surface or the outer wall surface of the plastic nut:

[0023] The external threads of each circumferential wall annular segment of the annular groove type plastic nuts D1, D2,..., D n are threadedly fixedly connected to the metal pipe simultaneously, or each circumferential wall annular segment of the annular groove type plastic nuts D1, D2,..., D n is fixedly connected to one end of the metal pipe by a pin and / or a screw simultaneously, or some of the circumferential wall annular segments of each circumferential wall annular segment of the annular groove type plastic nuts D1, D2,..., D n are fixedly connected to one end of the metal pipe by a pin and / or a screw, while the remaining circumferential wall annular segments are threadedly fixedly connected to one end of the metal pipe;

[0024] Or, when a helical groove is machined on the inner wall surface or the outer wall surface of the plastic nut:

[0025] The external thread of the helical groove type plastic nut is threadedly fixedly connected to one end of the metal pipe;

[0026] Either the spiral groove type plastic nut is fixedly connected to one end of the metal tube by a pin and / or a screw, or a part of the spiral groove type plastic nut is fixedly connected to one end of the metal tube by a pin and / or a screw while the remaining part is fixedly connected to one end of the metal tube by a thread.

[0027] Furthermore, there is also a driving motor which is fixedly connected to the lower housing. The driving shaft of the driving motor is the input shaft of the reduction gearbox housing. There is an integrally formed annular boss on the outer end face of the motor end cover of the driving motor. A cap is installed on the input shaft of the driving motor. The shape of the central hole of the cap matches the cross-sectional shape of the corresponding mating part of the input shaft. There is a groove on the cap 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.

[0028] Furthermore, a housing mounting head is provided on the reduction gearbox housing or a metal dust-proof pipe with a housing mounting head is provided. A pipe wall connection hole is opened at the other end of the metal tube or it is fixedly connected to a metal tube mounting head.

[0029] Furthermore, the reduction gearbox housing is fixedly connected with a housing mounting head, and the other end of the metal tube is fixedly connected with a metal tube mounting head. The metal tube mounting head and the housing mounting head are respectively located on both sides of the reduction gearbox housing. The transmission device is a three-stage gear transmission mechanism or a single-stage worm and worm gear transmission mechanism.

[0030] Furthermore, the helix angle Ψ of the internal thread of the plastic nut satisfies Ψ≤2.90°, and the lead screw has an external thread that matches the helix angle Ψ of the internal thread of the plastic nut.

[0031] To solve the above problems, the first technical solution to achieve the second object of the present invention is

[0032] A processing method of a grooved push rod device using a plastic nut, which is improved in that: in the grooved push rod device using a plastic nut, the processing steps for the external threads of the circumferential wall annular segments of the annular groove type plastic nuts D1, D2,..., D n of the annular groove type plastic nut structure to be simultaneously fixedly connected to one end of the metal tube by a thread are as follows:

[0033] Step 1: Make the outer circumference of the plastic nut blank into an external thread that matches the internal thread at one end of the metal tube;

[0034] Step 2: Open at least one or more circumferential annular grooves on the outer wall surface of the plastic nut blank. The circumferential annular grooves divide the plastic nut into an annular groove type plastic nut D1, D2,..., D with at least two or more circumferential wall annular segments and their bases being connected to each other n, the circumferential wall annular segments of the ring groove type plastic nuts D1, D2, …, D n each have a length between 5 and 80 mm, and the widths C1, C2, …, C of the respective circumferential ring grooves n are all greater than 0.05 mm, and the remaining thickness I of the wall between the bottom of the circumferential ring groove and the major diameter of the internal thread of the ring groove type plastic nuts D1, D2, …, D n is ≤ 3.0 mm;

[0035] Step Three: Apply adhesive glue to the outer wall surface of the plastic nut blank. The adhesive glue uses thread fastening glue, and rotate and install it into one end of the metal tube, so that the plastic nut blank can reach the set screwing position at one end of the metal tube and be thread-fastened to one end of the metal tube;

[0036] Step Four: After the glue solidifies, clamp the outer circle of the metal tube, and process the plastic nut blank into an internal thread that matches the external thread of the lead screw; the processing work of thread-fixing the external threads of the circumferential wall annular segments of the ring groove type plastic nuts D1, D2, …, D n to one end of the metal tube is completed.

[0037] To solve the above problems, the second technical solution for achieving the second object of the present invention is

[0038] A processing method of a segmented grooved push rod device using a plastic nut, which is characterized in that: the processing steps of thread-fixing the external threads of the circumferential wall annular segments of the ring groove type plastic nuts D1, D2, …, D in the grooved push rod device using a plastic nut n to one end of the metal tube are as follows:

[0039] Step One: Make the outer circumference of the plastic nut blank into an external thread that matches the internal thread at one end of the metal tube;

[0040] Step Two: Apply adhesive glue to the outer wall surface of the plastic nut blank. The adhesive glue uses thread fastening glue, and rotate and install it into one end of the metal tube, so that the plastic nut blank can reach the set screwing position at one end of the metal tube and be thread-fastened to one end of the metal tube;

[0041] Step Three: After the glue solidifies, clamp the outer circle of the metal tube, process the minor diameter hole of the internal thread of the plastic nut blank, and then cut at least one or more circumferential ring grooves on the inner wall surface of the minor diameter hole of the internal thread. The circumferential ring grooves divide the plastic nut into a ring groove type plastic nut D1, D2, …, D with at least two or more circumferential wall annular segments and their bases connected to each other n The ring groove type plastic nuts D1, D2, …, Dn The length of each circumferential wall annular segment is between 5 and 80 mm, and the groove widths C1, C2, …, C of each circumferential annular groove n are all greater than 0.05 mm, and the remaining thickness H of the wall thickness between the bottom of the circumferential annular groove and the minor diameter of the external thread of the annular groove type plastic nuts D1, D2, …, D n is ≤ 4.0 mm;

[0042] Step Four: Process the plastic nut blank into an internal thread that matches the external thread of the lead screw, and the processing of thread - fixing connection between the external thread of each circumferential wall annular segment of the annular groove type plastic nut and one end of the metal tube is completed.

[0043] To solve the above problems, the third technical solution to achieve the second object of the present invention is

[0044] A processing method of a grooved push rod device using a plastic nut, which is improved in that: the processing steps of thread - fixing connection between the external thread of the spiral - grooved plastic nut in the spiral - grooved plastic nut structure of the grooved push rod device using a plastic nut and one end of the metal tube are as follows:

[0045] Step One: Make the outer circumference of the plastic nut blank into an external thread that matches the internal thread of one end of the metal tube;

[0046] Step Two: Open at least one or more spiral grooves on the outer wall surface of the plastic nut blank. The distance from one groove end of the spiral groove to an adjacent end face of the spiral - grooved plastic nut is S 1， The distance from the other groove end of the spiral groove to the other adjacent end face of the spiral - grooved plastic nut is S 2， and S1 ≤ 80 mm, S2 ≤ 80 mm. The winding angle of the spiral groove is greater than or equal to 360 degrees. The groove width C of the spiral groove is greater than 0.05 mm. The pitch S of the spiral groove is between 5 and 80 mm. The remaining thickness I of the wall thickness between the bottom of the spiral groove and the major diameter of the internal thread of the spiral - grooved plastic nut is ≤ 3.0 mm;

[0047] Step Three: Apply adhesive glue on the outer wall surface of the plastic nut blank. The adhesive glue uses thread - fastening glue, and rotate and install it into one end of the metal tube so that the plastic nut blank can reach the set screwing position at one end of the metal tube and is thread - fastened to one end of the metal tube;

[0048] Step Four: After the glue solidifies, clamp the outer circle of the metal tube, and process the plastic nut blank into an internal thread that matches the external thread of the lead screw; the processing of thread - fixing connection between the external thread of the spiral - grooved plastic nut and one end of the metal tube is completed.

[0049] To solve the above problems, the fourth technical solution for achieving the second object of the present invention is as follows:

[0050] A processing method for a grooved push rod device using a plastic nut, which is improved in that: the processing steps of the external thread of the spiral groove type plastic nut in the spiral groove type plastic nut structure in the grooved push rod device using a plastic nut being threadedly fixed to one end of the metal tube are as follows:

[0051] Step 1: Make the outer circumference of the plastic nut blank into an external thread that matches the internal thread at one end of the metal tube;

[0052] Step 2: Apply adhesive glue to the outer wall surface of the plastic nut blank. The adhesive glue uses thread fastening glue, and rotate and install it into one end of the metal tube so that the plastic nut blank can reach the set screwing position at one end of the metal tube and is threadedly fastened to one end of the metal tube;

[0053] Step 3: After the glue solidifies, clamp the outer circle of the metal tube, process the inner thread small diameter hole of the plastic nut blank, and then cut at least one or more spiral grooves on the inner wall surface of the inner thread small diameter hole. The distance from one end of the spiral groove to an adjacent end face of the spiral groove type plastic nut is S 1， The distance from the other end of the spiral groove to the other adjacent end face of the spiral groove type plastic nut is S 2， And S1 ≤ 80 mm, S2 ≤ 80 mm, the winding angle of the spiral groove is greater than or equal to 360 degrees, the groove width C of the spiral groove is greater than 0.05 mm, the pitch S of the spiral groove is between 5 and 80 mm, and the remaining thickness H of the wall thickness between the bottom of the spiral groove and the external thread small diameter of the spiral groove type plastic nut is ≤ 4.0 mm;

[0054] Step 4: Process the plastic nut blank into an internal thread that matches the external thread of the lead screw, and the processing work of the external thread of the spiral groove type plastic nut being threadedly fixed to one end of the metal tube is completed.

[0055] The beneficial effects of the present invention are as follows: The grooved push rod device with a plastic nut has good self-lubricating performance because it uses a plastic nut, so it does not need to be frequently refueled, and it can move smoothly during the spiral transmission with the lead screw without adding lubricating grease again throughout its entire life cycle. It can also be used in harsh temperature environments with large temperature differences and under large static and dynamic loads. At the same time, the technical solution of grooving on the plastic nut is adopted. The plastic nut is cut into an approximately segmented structure that is sequentially connected to each other. The length of each segment of the segmented structure cut from the plastic nut becomes shorter. Therefore, after the length of a single segmented plastic nut of the plastic nut cut into an approximately segmented structure becomes shorter, its deformation amount will become smaller in a harsh temperature environment with a large temperature difference. Even if the plastic nut is used in a harsh temperature environment between -30°C and 70°C, there will be no problem of axial jamming between the plastic nut and the lead screw. Since the plastic nut is used to replace the copper nut, the production cost can be greatly reduced and the efficiency can be improved. In particular, the present invention can adapt to large-scale production, meet the market demand to the greatest extent, and multiply the enterprise benefits. At the same time, it can generate great social and economic benefits.

[0056] The production method of the grooved push rod device with a plastic nut, and the produced grooved push rod device with a plastic nut not only has good self-lubricating performance and does not need to be frequently refueled, but also will not have axial jamming in a harsh temperature environment with a large temperature difference and under large loads. It is not only particularly suitable for the lifting and / or angle adjustment functions of the solar power generation sun-tracking bracket push rod device in a harsh temperature environment with a large temperature difference and under large loads, but also applicable to special environments and occasions, such as scientific experiments, polar expeditions, deep-sea explorations, desert or tropical environments, etc. Brief Description of the Drawings

[0057] Figure 1 It is a schematic structural diagram of the first embodiment of the grooved push rod device with a plastic nut of the present invention, showing the structure of a circumferential ring groove opened on the inner wall surface of the plastic nut;

[0058] Figure 2 It is a schematic structural diagram of the first embodiment of the grooved push rod device with a plastic nut of the present invention, showing the structure of a spiral groove opened on the inner wall surface of the plastic nut;

[0059] Figure 3 It is a schematic diagram of a partial cross-section of the oil-blocking structure of the first embodiment of the grooved push rod device with a plastic nut of the present invention;

[0060] Figure 4 It is an enlarged schematic diagram of a partial cross-section of the oil-blocking structure of the first embodiment of the grooved push rod device with a plastic nut of the present invention;

[0061] Figure 5It is the first schematic diagram of the oil-blocking structure of the first embodiment of the grooved push rod device with a plastic nut in the present invention;

[0062] Figure 6 It is the second schematic diagram of the oil-blocking structure of the first embodiment of the grooved push rod device with a plastic nut in the present invention;

[0063] Figure 7 It is the installation schematic diagram of the input shaft and the lower housing of the oil-blocking structure of the first embodiment of the grooved push rod device with a plastic nut in the present invention;

[0064] Figure 8 It is the sectional structure schematic diagram of a plastic nut with a circumferential ring groove machined on the inner wall surface of the plastic nut of the first embodiment of the grooved push rod device with a plastic nut in the present invention being screwed onto a metal tube;

[0065] Figure 9 It is the sectional structure schematic diagram of a plastic nut with a circumferential ring groove machined on the inner wall surface of the plastic nut of the first embodiment of the grooved push rod device with a plastic nut in the present invention being screwed onto a switch contact ring;

[0066] Figure 10 It is the sectional structure schematic diagram of a plastic nut with a circumferential ring groove machined on the inner wall surface of the plastic nut of the first embodiment of the grooved push rod device with a plastic nut in the present invention;

[0067] Figure 11 It is the sectional structure schematic diagram of a plastic nut with a single-start spiral groove machined on the inner wall surface of the plastic nut of the first embodiment of the grooved push rod device with a plastic nut in the present invention;

[0068] Figure 12 It is the overall structure schematic diagram of the second embodiment of the grooved push rod device with a plastic nut in the present invention;

[0069] Figure 13 It is the overall structure schematic diagram of the third embodiment of the grooved push rod device with a plastic nut in the present invention;

[0070] Figure 14 It is the sectional structure schematic diagram along the A-A direction of the third embodiment of the grooved push rod device with a plastic nut in the present invention;

[0071] Figure 15 It is the overall structure schematic diagram of the fourth embodiment of the grooved push rod device with a plastic nut in the present invention;

[0072] Figure 16 It is the sectional structure schematic diagram along the B-B direction of the fourth embodiment of the grooved push rod device with a plastic nut in the present invention;

[0073] Figure 17 It is a schematic structural view of the fifth embodiment of the grooved push rod device with a plastic nut according to the present invention, showing the circumferential annular groove formed on the outer wall surface of the plastic nut;

[0074] Figure 18 It is a schematic structural view of the fifth embodiment of the grooved push rod device with a plastic nut according to the present invention, showing the helical groove formed on the outer wall surface of the plastic nut;

[0075] Figure 19 It is a schematic sectional view of the fifth embodiment of the grooved push rod device with a plastic nut according to the present invention, showing the plastic nut with a circumferential annular groove on its outer wall surface screwed onto a metal tube;

[0076] Figure 20 It is a schematic sectional view of the fifth embodiment of the grooved push rod device with a plastic nut according to the present invention, showing the plastic nut with a helical groove on its outer wall surface screwed onto a switch contact ring;

[0077] Figure 21 It is a schematic sectional view of the fifth embodiment of the grooved push rod device with a plastic nut according to the present invention, showing the plastic nut with a circumferential annular groove on its outer wall surface;

[0078] Figure 22 It is a schematic sectional view of the fifth embodiment of the grooved push rod device with a plastic nut according to the present invention, showing the plastic nut with a single - start helical groove on its outer wall surface;

[0079] Figure 23 It is a schematic overall structure view of the fifth embodiment of the grooved push rod device with a plastic nut according to the present invention, showing the plastic nut with a single - start helical groove on its outer wall surface;

[0080] Figure 24 It is a schematic view of the helix angle of the nut of the grooved push rod device with a plastic nut according to the present invention;

[0081] Figure 25 It is a schematic sectional view of the first embodiment of the grooved push rod device with a plastic nut according to the present invention, showing the plastic nut with a double - start helical groove formed on its inner wall surface;

[0082] Figure 26 It is a schematic overall structure view of the fifth embodiment of the grooved push rod device with a plastic nut according to the present invention, showing the plastic nut with a double - start helical groove on its outer wall surface.

[0083] In the figure: drive motor 100, input shaft 120, exposed end 121 of the output shaft, upper housing 200, lower housing 300, transmission device 400, lead screw 500, nut 600, circumferential ring groove 601, helical groove 602, switch contact ring 700, metal tube 800, housing mounting head 901, metal tube mounting head 902, ring groove type plastic nut D1, ring groove type plastic nut D2, ring groove type plastic nut D3, ring groove type plastic nut D4. Detailed implementation mode

[0084] Next, the technical solutions of the present invention will be clearly and completely described in conjunction with the drawings of the embodiments of the present invention.

[0085] Embodiment 1:

[0086] As Figure 1 、 Figure 2 、 Figures 8 to 23 、 Figure 25 、 Figure 26 shown, a slotted push rod device using a plastic nut according to the present invention includes an input shaft 120, an upper housing 200, a lower housing 300, a transmission device 400, a lead screw 500, a plastic nut 600, and a metal tube 800. The upper housing 200 and the lower housing 300 are fixedly connected to form a reduction gearbox and form a space for accommodating the transmission device 400. The transmission device 400 is a gear transmission mechanism or a worm and worm gear transmission mechanism. The input shaft 120 has an exposed end 121 located outside the reduction gearbox and an extending end located inside the reduction gearbox. The extending end of the input shaft 120 is a toothed shaft or a worm, and the toothed shaft or the worm at the extending end of the input shaft 120 is respectively meshed with the first-stage gear or the worm wheel of the transmission device 400. The final-stage gear or the worm wheel of the transmission device 400 is fixedly connected to or integrally formed with the lead screw 500 to drive the lead screw 500 to rotate. The plastic nut 600 is helically installed on the lead screw 500, and one end of the metal tube 800 is fixedly connected to the outer circumference of the plastic nut 600. When the lead screw 500 rotates, it drives the plastic nut 600 to perform a reciprocating linear motion on the lead screw 500. The improvement lies in:

[0087] 1), the plastic nut 600 is a slotted plastic nut, and a circumferential ring groove 601 or a helical groove 602 is formed on the inner wall surface or the outer wall surface of the plastic nut 600,

[0088] 2), when the circumferential ring groove 601 is formed on the inner wall surface or the outer wall surface of the plastic nut 600:

[0089] a, the plastic nut 600 has a ring groove type plastic nut structure, and the ring groove type plastic nut structure is composed of at least one or more circumferential ring grooves 601 formed on the inner wall surface or the outer wall surface of the plastic nut 600,

[0090] b. The circumferential annular groove 601 divides the plastic nut 600 into annular-groove plastic nuts D1, D2, …, D with at least two or more circumferential wall annular segments and their bases connected to each other, n , where n≥2 and n is a positive integer. The groove widths C1, C2, …, C of each circumferential annular groove 601 n are all greater than 0.05 mm.

[0091] c. The length of each circumferential wall annular segment of the annular-groove plastic nuts D1, D2, …, D n is between 5 and 80 mm.

[0092] d. The remaining thickness H of the wall thickness between the bottom of the circumferential annular groove 601 and the minor diameter of the external thread of the annular-groove plastic nuts D1, D2, …, D is ≤4.0 mm, or the remaining thickness I of the wall thickness between the bottom of the circumferential annular groove 601 and the major diameter of the internal thread of the annular-groove plastic nuts D1, D2, …, D is ≤3.0 mm. n n

[0093] e. Each circumferential wall annular segment of the annular-groove plastic nuts D1, D2, …, D is fixedly connected to the metal tube 800 at the same time; n

[0094] Or, when a helical groove 602 is machined on the inner wall surface or the outer wall surface of the plastic nut 600:

[0095] a'. The plastic nut 600 is a helical-groove plastic nut structure, which is composed of at least one or more helical grooves 602 machined on the inner wall surface or the outer wall surface of the plastic nut 600. The distance from one groove end of the helical groove 602 to an adjacent end face of the helical-groove plastic nut is S 1， The distance from the other groove end to the other adjacent end face of the helical-groove plastic nut is S 2， and S1≤80 mm, S2≤80 mm.

[0096] b'. The winding angle of the helical groove 602 of the helical-groove plastic nut is greater than or equal to 360 degrees, and the groove width C of the helical groove 602 is greater than 0.05 mm.

[0097] c'. The pitch S of the helical groove 602 is between 5 and 80 mm.

[0098] d', the remaining thickness H of the wall thickness between the bottom of the spiral groove 602 and the minor diameter of the external thread of the spiral groove type plastic nut is ≤ 4.0 mm, or the remaining thickness I of the wall thickness between the bottom of the spiral groove 602 and the major diameter of the internal thread of the spiral groove type plastic nut is ≤ 3.0 mm,

[0099] e', the spiral groove type plastic nut is fixedly connected to one end of the metal tube 800.

[0100] In the present invention, the reduction gearbox encloses the transmission device 400 in a space enveloped by the upper housing 200 and the lower housing 300, and the input shaft 120 and the exposed end 121 can be of an integral structure or can be of a split structure installed integrally. The input shaft 120 extends into the space enveloped by the upper housing 200 and the lower housing 300. The end of the input shaft 120 is a straight tooth shaft and meshes with the first-stage straight gear of the transmission device 400; or the end of the input shaft 120 is a helical tooth shaft and meshes with the first-stage helical gear of the transmission device 400; or the end of the input shaft 120 is a worm and meshes with the first-stage worm gear of the transmission device 400. The metal tube 800 and the plastic nut 600 can be connected and fixed into one body by various methods such as but not limited to threaded connection, pin connection, screw connection, circlip connection, etc. During threaded connection, the plastic nut 600 can also use thread fastening glue or anaerobic glue at the threaded contact part with the metal tube 800 to realize the positioning of the plastic nut 600 inside the metal tube 800 and achieve a fixed connection with the metal tube 800.

[0101] 1), when the circumferential ring groove 601 is machined on the inner wall surface or the outer wall surface of the plastic nut in the present invention: according to the length of the plastic nut 600, the machined circumferential ring groove 601 can be one or more. The circumferential ring groove 601 is machined at equal or unequal intervals along the axial direction of the plastic nut 600;

[0102] When ensuring that the static load and dynamic load that each section of the ring groove type plastic nut D1, D2,..., D n can bear meet the design requirements, the ring groove type plastic nut D1, D2,..., D with the circumferential ring groove 601 machined n The length of each circumferential wall annular section of each section is 5 - 80 mm. The ring groove type plastic nut D1, D2,..., D at this length n can bear a large static load and dynamic load and can be used in various occasions such as coal mine machinery, etc. When used in the push rod device of the solar power generation sun-tracking bracket, the length L1, L2,..., L of each circumferential wall annular section of the ring groove type plastic nut D1, D2,..., D formed after the plastic nut 600 is machined with the circumferential ring groove 601 n nAll can be between 5 and 50 mm, and the groove widths C1, C2, …, C of each circumferential annular groove 601 n are all greater than 0.05 mm. After the circumferential annular grooves 601 are machined on the plastic nut 600, the lengths L1, L2, …, L of each circumferential wall annular segment of the annular groove type plastic nuts D1, D2, …, D n n are preferably between 20 and 50 mm. Using the preferred dimensions can further improve the ability of the plastic nut 600 to withstand static loads and dynamic loads;

[0103] After the circumferential annular grooves 601 are machined on the plastic nut 600, the remaining thickness H of the wall thickness between the groove bottom of the circumferential annular groove 601 and the minor diameter of the external thread of the annular groove type plastic nuts D1, D2, …, D n is ≤ 4.0 mm, which is beneficial to keeping the plastic nut 600 after grooving as a whole and avoiding the plastic nut 600 being cut and broken due to excessive cutting. According to the actual use situation and processing situation, the minimum remaining thickness H can be close to 0.1 mm;

[0104] After the circumferential annular grooves 601 are machined on the plastic nut 600, the remaining thickness I of the wall thickness between the groove bottom of the circumferential annular groove 601 and the major diameter of the internal thread of the annular groove type plastic nuts D1, D2, …, D n is ≤ 3.0 mm, which is beneficial to keeping the plastic nut 600 after grooving as a whole and avoiding the plastic nut 600 being cut and broken due to excessive cutting. According to the actual use situation and processing situation, the minimum remaining thickness I can be close to 0.1 mm.

[0105] 2) In the present invention, when a helical groove 602 is machined on the inner wall surface or the outer wall surface of the plastic nut 600: The helical groove 602 can be a single - start helical groove or a multi - start helical groove, and a double - start helical groove is preferably used in the multi - start helical grooves;

[0106] On the premise of ensuring that the static load and dynamic load that each section of the grooved plastic nut can withstand meet the design requirements, the pitch S of the helical groove 602 is between 5 and 80 mm. The helical groove type plastic nut formed by cutting the helical groove at this pitch can withstand large static loads and dynamic loads and can be used in various occasions, such as coal mine machinery, etc.; When used in the push rod device of the solar power generation sun - tracking bracket, the pitch S of the helical groove type plastic nut formed after the plastic nut 600 is machined with the helical groove 602 can be between 5 and 50 mm, and the groove widths C1, C2, …, C of the helical groove 602 n ​All are greater than 0.05 mm. The pitch S of the helical groove type plastic nut formed after the plastic nut 600 is machined with a helical groove 602 is preferably between 20 and 50 mm. Using the preferred dimensions can further improve the ability of the plastic nut 600 to withstand static and dynamic loads;

[0107] The remaining thickness H of the wall thickness between the bottom of the helical groove 602 machined on the plastic nut 600 and the minor diameter of the external thread of the helical groove type plastic nut is H ≤ 4.0 mm, which is beneficial to keeping the plastic nut 600 after grooving as a whole and avoiding the plastic nut 600 being cut and broken due to excessive cutting. According to the actual use and processing conditions, the minimum remaining thickness H can be close to 0.1 mm;

[0108] The remaining thickness I of the wall thickness between the bottom of the helical groove 602 machined on the plastic nut 600 and the major diameter of the internal thread of the helical groove type plastic nut is I ≤ 3.0 mm, which is beneficial to keeping the plastic nut 600 after grooving as a whole and avoiding the plastic nut 600 being cut and broken due to excessive cutting. According to the actual use and processing conditions, the minimum remaining thickness I can be close to 0.1 mm.

[0109] Such as Figures 8 to 11 、 Figures 19 to 23 、 Figure 25 、 Figure 26 As shown in

[0110] Such as Figure 1 、 Figure 2 、 Figures 8 to 13 、 Figure 15 、 Figures 17 to 26 As shown in n The external threads of the circumferential wall annular segments of the annular groove type plastic nuts D1, D2,..., D nEach circumferential wall annular segment thereof is simultaneously fixedly connected to one end of the metal tube 800 by pins and / or screws, or the annular groove type plastic nuts D1, D2, …, D n Among the circumferential wall annular segments of each part, some circumferential wall annular segments are fixedly connected to one end of the metal tube 800 by pins and / or screws, while the remaining circumferential wall annular segments are fixedly connected to one end of the metal tube 800 by threads;

[0111] Alternatively, when the inner wall surface or the outer wall surface of the plastic nut 600 is provided with a spiral groove 602: the external thread of the spiral groove type plastic nut is fixedly connected to one end of the metal tube 800 by threads; or the spiral groove type plastic nut is fixedly connected to one end of the metal tube 800 by pins and / or screws, or some of the spiral groove type plastic nuts are fixedly connected to one end of the metal tube 800 by pins and / or screws while the remaining parts are fixedly connected to one end of the metal tube 800 by threads.

[0112] As Figures 8 to 13 、 Figures 19 to 26 shown, the major diameter Ф2 of the external thread of the lead screw 500 is between 15 and 35 mm, and the outer diameter Ф4 of the matching plastic nut 600 is between 30 and 50 mm. The matching selection of the lead screw 500 and the plastic nut 600 can enable the plastic nut 600 to still have good comprehensive mechanical properties in a harsh temperature environment with a large temperature difference, so that it has the ability to bear large static loads and dynamic loads.

[0113] As Figure 1 、 Figure 2 、 Figure 3 、 Figure 8 、 Figure 9 、 Figure 12 、 Figure 13 、 Figure 15 、 Figure 17 、 Figure 18 、 Figure 19 、 Figure 20As shown, in the grooved push rod device with a plastic nut of the present invention, 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. To prevent the nut 600 from separating from the switch contact ring 700 or the metal tube 800, anaerobic glue or thread fastening glue is applied at the screwed joint to fix and connect them. A switch for starting the drive motor 100 in the electric push rod device is installed on the switch contact ring 700. When it is necessary for the electric push rod device to lift and / or adjust the angle of an external mechanism, the moving part on the external mechanism for starting the electric push rod device touches the switch device located on the switch contact ring 700, so that the drive motor 100 is powered on and rotates to start. The input shaft 120 drives the transmission device 400 to rotate, so that the lead screw 500 rotates accordingly, and then drives the nut 600 screwed and fixedly connected to the metal tube 800 to perform a 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.

[0114] As Figure 1 , Figure 3 , Figure 4 , Figure 5 , Figure 6 , Figure 7As shown in the figure, in the grooved push rod device with a plastic nut of the present invention, there is also a driving motor 100. 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 gearbox housing. An integrally formed annular boss 111 is provided on the outer end face of the motor end cover 110 of the driving motor 100. A cap 130 is installed on the input shaft 120 of the driving motor 100. The shape of the central hole of the cap 130 matches the cross-sectional shape of the corresponding mating part of the input shaft 120. The cap 130 has a groove that matches the annular boss 111 of the motor end cover 110. The cap 130 and the annular boss 111 of the motor end cover 110 form a labyrinth oil-blocking structure. The shape of the central hole of the cap 130 is tooth-shaped or circular, which matches the tooth-shaped or circular shape of the cross-section of the corresponding mating part of the input shaft 120. The cap 130 and the input shaft 120 are in interference fit. There is a gap between the groove of the cap 130 and the annular boss 111 of the motor end cover 110 to form a spatial separation. The separation gap can be between 0.2 and 0.5 mm. The separation gap of 0.2 to 0.5 mm can prevent the cap 130, which is integrally installed with the input shaft 120 of the driving motor 100 in interference fit, from rubbing against the annular boss 111 when the input shaft 120 rotates, and will not cause jamming to the rotation of the driving motor 100. At the same time, the cap 130 and the annular boss 111 form an oil-blocking structure that can prevent lubricating grease from flowing from the inside of the reduction gearbox into the driving motor, which well solves the problem that the lubricating grease seeps into the driving motor along the driving shaft of the driving motor.

[0115] As Figure 1 , Figure 3 , Figure 4 , Figure 5 , Figure 6 , Figure 7As shown in the figure, in the slotted push rod device with a plastic nut of the present invention, the cap 130 is in interference fit with the input shaft 120. The cap 130 has an umbrella-like structure, and the cap 130 keeps covering or partially covering the annular boss 111 of the motor end cover 110 with a certain gap. When the toothed shaft or worm at the end of the input shaft 120 of the driving motor 100 meshes and drives with the first-stage straight toothed shaft, helical toothed shaft or worm wheel of the transmission device 400 respectively, since the cap 130 covers or partially covers the outside of the annular boss 111 of the motor end cover 110, the lubricating grease used to achieve the lubrication function between the transmission device 400 and the input shaft 120 is blocked outside the cap 130 and flows along the outer surface of the umbrella-like structure of the cap 130 into the annular cavity space formed by the connection of the motor end cover 110 and the lower housing 300. And the annular boss 111 inside the cap 130 and the cap 130 form a stepped labyrinth structure. Even when the height of the lubricating grease in the annular cavity space formed by the connection of the motor end cover 110 and the lower housing 300 exceeds the height of the cap 130, due to the stepped labyrinth structure and the centrifugal force of the cap 130 and the annular boss 111 on the attached grease, the lubricating grease still cannot flow into the area above the annular boss 111 of the input shaft 120. Thus, the oil-blocking structure formed by the cap 130 and the annular boss 111 can prevent the lubricating grease from flowing from the inside of the speed reducer into the driving motor, which well solves the problem in the prior art that the lubricating grease seeps into the driving motor along the driving shaft of the driving motor.

[0116] As Figure 1 , Figure 3 , Figure 4 , Figure 5 , Figure 6 , Figure 7 As shown in the figure, in the slotted push rod device with a plastic nut of the present invention, the outer periphery of the cap 130 has a circular or polygonal structure, and the shape of the central hole of the cap 130 is an internal gear ring shape or a circular shape. The annular boss 111 that is matched with the cap 130 to form a labyrinth oil-blocking 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 mating part of the input shaft 120. At the same time, the diversity of the shape of the central hole of the cap 130 enables the cap 130 to be applicable and matched with input shafts 120 of different shapes, and is applicable to motor end covers 110 with different types of annular bosses 111. Its versatility is more extensive, and the structure can be selected according to different motor end covers 110, which is more conducive to the matching of the cap 130 and the annular boss 111 of the motor end cover 110.

[0117] As Figure 1 ,Figure 3 , Figure 4 , Figure 5 , Figure 6 , Figure 7 As shown in Figure 7 , in the grooved push rod device with 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 the following two material combination methods: 1. Both the cap 130 and the motor end cover 110 are 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 anti-friction effect. When the driving motor 100 drives the cap 130 located on the input shaft 120 to rotate, even if the cap 130 rubs against the annular boss 111 of the motor end cover 110, the cap 130 will not be excessively worn and damaged.

[0118] As Figure 1 , Figure 2 , Figure 3 , Figure 12 , Figure 13 , Figure 15 , Figure 17 , Figure 18 As shown in Figure 18 , in the grooved push rod device with a plastic nut of the present invention, the reduction gearbox body is provided with a housing mounting head 901 or a metal dust-proof pipe with a housing mounting head 901. The other end of the metal pipe 800 is provided with a pipe wall connection hole or is fixedly connected to a metal pipe mounting head 902. Specifically, the housing mounting head 901 is installed on the upper housing 200 of the reduction gearbox body or the lower housing 300 of the reduction gearbox body; or the upper housing 200 of the reduction gearbox body is integrally formed with the housing mounting head 901 or the lower housing 300 of the reduction gearbox body is integrally formed with the housing mounting head 901; or the housing mounting head 901 is located on a metal dust-proof pipe integrally installed and connected with the reduction gearbox body, or on a component installed and connected with the reduction gearbox body. The housing mounting head 901 can be used to connect the fixed end of an external mechanism, and the metal pipe mounting head 902 can be used to connect the moving end of an external mechanism, and vice versa.

[0119] As Figure 1 , Figure 2 , Figure 3 , Figure 12 , Figure 13 , Figure 15 , Figure 17 , Figure 18As shown, in the grooved push rod device with a plastic nut of the present invention, the reduction gearbox is fixedly connected to the housing mounting head 901, the other end of the metal tube 800 is fixedly connected with 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 gearbox. The transmission device 400 is a three-stage gear transmission mechanism or a single-stage worm and gear transmission mechanism. Of course, it can also be changed to an installation structure in which the reduction gearbox is provided with a metal dust-proof tube with a housing mounting head 901, and the other end of the metal tube 800 is provided with a pipe wall connection hole, so as to be applicable to occasions with a compact position. The transmission device 400 can also be a gear transmission mechanism with no less than two stages or a single-stage or multi-stage worm and gear transmission mechanism. Such a transmission device 400 can simplify the structure on the premise of meeting the transmission function, and preferably a three-stage gear transmission mechanism or a single-stage worm and gear transmission mechanism is adopted; according to the output torque of the driving motor 100 and the rotation speed of the input shaft 120 being different, in order to achieve the best function of the screw rod 500 driving the nut 600 to lift to realize the function of the electric push rod device, a two-stage or four-stage gear transmission mechanism or a two-stage worm and gear transmission mechanism can also be selected.

[0120] As Figure 1 , Figure 3 , Figure 4 , Figure 7 , Figures 12 to 17 As shown, in the grooved push rod device with 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 is in the structure of a square shaft, a hexagonal shaft, a flat potential or a spline shaft. The exposed ends 121 in various structural forms can be adapted to various structural forms of external manual control or electric control mechanisms, having the advantages of high assembly or cooperation stability. At the same time, the input shaft 120 with various forms of exposed ends 121 has strong replaceability, is more suitable for mass production, and can also better realize the transmission of external power to the transmission device 400 through the input shaft 120, improving the working stability of the push rod device.

[0121] As Figure 24As shown in the figure, in the slotted push rod device with a plastic nut according to the present invention, the helix angle Ψ of the internal thread of the plastic nut 600 satisfies Ψ ≤ 2.90°, and the lead screw 500 has an external thread that matches the helix angle Ψ of the internal thread of the plastic nut 600. Only when the helix angle Ψ is selected to be less than or equal to 2.90°, when the external environmental temperature reaches 70 °C, the plastic nut 600 in the self-locking push rod device still has a self-locking function for the lead screw 500; when the helix angle Ψ is greater than 2.90°, when the external environmental temperature reaches 70 °C, the plastic nut 600 in the self-locking push rod device no longer has a self-locking function for the lead screw 500. Since the self-locking push rod device uses a plastic nut, it has good self-lubricating performance and does not require frequent refueling, enabling smooth movement during the helical transmission with the lead screw without the need to add lubricating grease again throughout its entire life cycle. At the same time, because the helix angle of the internal thread of the plastic nut used is Ψ ≤ 2.90°, and the lead screw has an external thread that matches the helix angle Ψ of the internal thread of the plastic nut, the helix angles of the internal thread of the plastic nut and the external thread of the lead screw are reduced. In a harsh temperature environment with a large temperature difference and under a large load, after the self-locking push rod device reaches the set lifting height and / or angular position during the helical transmission between the plastic nut and the lead screw, the smaller helix angle of the plastic nut can lock the lead screw and has a high self-locking ability. That is, even when the driving force is lost and the axial load force continues to exist, the lead screw will not rotate relative to the plastic nut and can lock the lead screw well, enabling the entire push rod device to maintain the set lifting height and / or angular position well and preventing equipment and safety accidents.

[0122] As Figure 1 , Figures 8 to 10 , Figure 12 , Figure 13 , Figure 15 , Figure 17 , Figure 19 , Figure 20 , Figure 21 As shown in the figure, in the slotted push rod device with a plastic nut according to the present invention, the plastic nut 600 is a ring groove type plastic nut with 4 circumferential wall annular segments, and the 4 circumferential wall annular segments of the ring groove type plastic nut D1, D2, D3, D4 are simultaneously threadedly fixed to the metal tube 800. It can also be that each of the 4 circumferential wall annular segments of the ring groove type plastic nut D1, D2, …, D n is fixed to the metal tube 800 by a pin for each segment. Between the ring groove type plastic nut D1, D2, …, D n and the metal tube 800, the reliability of their fixed connection can also be enhanced by applying adhesive glue; or each of the 4 circumferential wall annular segments of the ring groove type plastic nut D1, D2, …, D nEach section in it is fixedly connected to the metal tube 800 through a threaded connection method. Between the annular groove type plastic nuts D1, D2, …, D n and the metal tube 800, the reliability of the fixed connection between the two can also be enhanced by applying adhesive glue.

[0123] Embodiment 2:

[0124] As Figure 17 、 Figures 19 to 21 shown, in the slotted push rod device with plastic nuts of the present invention, a processing method for the first slotted push rod device with plastic nuts is provided. The improvement lies in that: in the slotted push rod device with plastic nuts, the external threads of the circumferential wall annular segments of the annular groove type plastic nuts D1, D2, …, D n of the annular groove type plastic nut structure are simultaneously fixedly connected to one end of the metal tube 800 by threads. The processing steps are as follows:

[0125] Step 1: Make the outer circumference of the plastic nut 600 blank into an external thread matching the internal thread at one end of the metal tube 800;

[0126] Step 2: Open at least one or more circumferential annular grooves 601 on the outer wall surface of the plastic nut 600 blank. The circumferential annular grooves 601 divide the plastic nut 600 into annular groove type plastic nuts D1, D2, …, D n with at least two or more circumferential wall annular segments and their bases being connected to each other. The length of each circumferential wall annular segment of the annular groove type plastic nuts D1, D2, …, D n is between 5 and 80 mm. The groove widths C1, C2, … C n of the circumferential annular grooves 601 are all greater than 0.05 mm. The remaining thickness I of the wall between the bottom of the circumferential annular groove 601 and the major diameter of the internal thread of the annular groove type plastic nuts D1, D2, …, D n is ≤ 3.0 mm;

[0127] Step 3: Apply adhesive glue to the outer wall surface of the plastic nut 600 blank. The adhesive glue uses thread fastening glue, and rotate and install it into the internal thread at one end of the metal tube 800, so that the plastic nut 600 blank can reach the set screwing position at one end of the metal tube 800 and is thread-fastened to the metal tube 800 at one end;

[0128] Step 4: After the glue solidifies, clamp the outer circle of the metal tube 800, and process the plastic nut 600 blank into an internal thread matching the external thread of the lead screw 500; The processing work of the external threads of the circumferential wall annular segments of the annular groove type plastic nuts D1, D2, …, D n being fixedly connected to one end of the metal tube 800 is completed.

[0129] Example 3:

[0130] As Figure 1 , Figures 8 to 10 , Figure 12 , Figure 13 , Figure 15 shown, in the grooved push rod device with plastic nuts of the present invention, a second processing method of the segmented grooved push rod device with plastic nuts is provided. The improvement lies in that: in the grooved push rod device with plastic nuts, the external threads of the circumferential wall annular segments of the ring groove type plastic nuts D1, D2,..., D n of the ring groove type plastic nut structure are simultaneously thread-fixedly connected to one end of the metal tube 800, and the processing steps are as follows:

[0131] Step 1: Make the outer circumference of the plastic nut 600 blank match the internal thread of one end of the metal tube 800 with an external thread;

[0132] Step 2: Apply adhesive glue to the outer wall surface of the plastic nut 600 blank. The adhesive glue uses thread fastening glue, and rotate and install it into the internal thread of one end of the metal tube 800, so that the plastic nut 600 blank can reach the set screwing position at one end of the metal tube 800 and is thread-fastenedly connected to one end of the metal tube 800;

[0133] Step 3: After the glue solidifies, clamp the outer circle of the metal tube, process the inner thread small diameter hole of the plastic nut 600 blank, and then cut at least one or more circumferential ring grooves 601 on the inner wall surface of the inner thread small diameter hole. The circumferential ring grooves 601 divide the plastic nut 600 into ring groove type plastic nuts D1, D2,..., D n with at least two or more circumferential wall annular segments and their bases being interconnected. The length of each circumferential wall annular segment of the ring groove type plastic nuts D1, D2,..., D n is between 5 and 80 mm. The groove widths C1, C2,... C n of the circumferential ring grooves 601 are all greater than 0.05 mm. The remaining thickness H of the wall thickness between the groove bottom of the circumferential ring groove 601 and the external thread small diameter of the ring groove type plastic nuts D1, D2,..., D n ≤ 4.0 mm;

[0134] Step 4: Process the plastic nut 600 blank into an internal thread that matches the external thread of the lead screw 500, and the processing of the external threads of the circumferential wall annular segments of the ring groove type plastic nuts D1, D2,..., D n being thread-fixedly connected to one end of the metal tube 800 is completed.

[0135] Example 4:

[0136] As Figure 18 , Figure 22 , Figure 23 , Figure 26 shown, in the grooved push rod device with a plastic nut of the present invention, a third processing method of the grooved push rod device with a plastic nut is provided. The improvement lies in that: the processing steps of the external thread of the spiral groove type plastic nut in the spiral groove type plastic nut structure in the grooved push rod device with a plastic nut being threadedly fixed to one end of the metal tube 800 are as follows:

[0137] Step 1: Make the outer circumference of the blank of the plastic nut 600 into an external thread matching the internal thread at one end of the metal tube 800;

[0138] Step 2: Open at least one or more spiral grooves 602 on the outer wall surface of the blank of the plastic nut 600. The distance from one groove end of the spiral groove 602 to an adjacent end face of the spiral groove type plastic nut is S 1， The distance from the other groove end to the other adjacent end face of the spiral groove type plastic nut is S 2， And S1≤80mm, S2≤80mm. The winding angle of the spiral groove 602 is greater than or equal to 360 degrees. The groove width C of the spiral groove 602 is greater than 0.05mm. The pitch S of the spiral groove 602 is between 5 and 80mm. The remaining thickness I of the wall thickness between the bottom of the circumferential ring groove 602 and the major diameter of the internal thread of the spiral groove type plastic nut is ≤3.0mm;

[0139] Step 3: Apply adhesive glue on the outer wall surface of the blank of the plastic nut 600. The adhesive glue uses thread fastening glue, and rotate and install it into one end of the metal tube 800, so that the blank of the plastic nut 600 can reach the set screwing position at one end of the metal tube 800 and be threadedly fastened to one end of the metal tube 800;

[0140] Step 4: After the glue solidifies, clamp the outer circle of the metal tube, and process the blank of the plastic nut 600 into an internal thread matching the external thread of the lead screw 500; the processing of the external thread of the spiral groove type plastic nut being threadedly fixed to one end of the metal tube 800 is completed.

[0141] Example Five:

[0142] As Figure 2 , Figure 11 , Figure 25As shown, in the grooved push rod device with a plastic nut of the present invention, a fourth processing method for the grooved push rod device with a plastic nut is provided. The improvement lies in that the processing steps for the external thread of the spiral groove type plastic nut in the spiral groove type plastic nut structure in the grooved push rod device with a plastic nut to be threadedly fixed to one end of the metal tube 800 are as follows:

[0143] Step 1: Make the outer circumference of the blank of the plastic nut 600 into an external thread that matches the internal thread at one end of the metal tube 800;

[0144] Step 2: Apply an adhesive glue to the outer wall surface of the blank of the plastic nut 600. The adhesive glue uses a thread fastening glue, and rotate and install it into the internal thread at one end of the metal tube 800 so that the blank of the plastic nut 600 can reach the set screwing position at one end of the metal tube 800 and be threadedly fastened to the internal thread at one end of the metal tube 800;

[0145] Step 3: After the glue solidifies, clamp the outer circle of the metal tube, process the minor diameter hole of the internal thread of the blank of the plastic nut 600, and then cut at least one or more spiral grooves 602 on the inner wall surface of the minor diameter hole of the internal thread. The distance from one end of the spiral groove 602 to an adjacent end face of the spiral groove type plastic nut is S 1， The distance from the other end of the spiral groove to the other adjacent end face of the spiral groove type plastic nut is S 2， And S1≤80mm, S2≤80mm, the winding angle of the spiral groove 602 is greater than or equal to 360 degrees, the groove width C of the spiral groove 602 is greater than 0.05mm, the pitch S of the spiral groove 602 is between 5 and 80mm, and the remaining thickness H of the wall thickness between the bottom of the spiral groove 602 and the minor diameter of the external thread of the spiral groove type plastic nut is ≤4.0mm;

[0146] Step 4: Process the blank of the plastic nut 600 into an internal thread that matches the external thread of the lead screw 500, and the processing work for the external thread of the spiral groove type plastic nut to be threadedly fixed to one end of the metal tube 800 is completed.

Claims

1. A slotted push rod device using a plastic nut, comprising an input shaft (120), an upper housing (200), a lower housing (300), a transmission device (400), a lead screw (500), a plastic nut (600) and a metal tube (800). The upper housing (200) and the lower housing (300) are fixedly connected to form a reduction gearbox body and form a space for accommodating the transmission device (400). The transmission device (400) is a gear transmission mechanism or a worm and worm gear transmission mechanism. The input shaft (120) has an exposed end (121) located outside the reduction gearbox body and an extending end located inside the reduction gearbox body. The extending end of the input shaft (120) is a toothed shaft or a worm, and the toothed shaft or the worm at the extending end of the input shaft (120) is respectively meshed with the first-stage gear or the worm wheel of the transmission device (400). The last-stage gear or the worm wheel of the transmission device (400) is fixedly connected to or integrally formed with the lead screw (500) to drive the lead screw (500) to rotate. The plastic nut (600) is helically installed on the lead screw (500), and one end of the metal tube (800) is fixedly connected to the outer circumference of the plastic nut (600). When the lead screw (500) rotates, it drives the plastic nut (600) to perform a reciprocating linear motion on the lead screw (500). It is characterized in that: 1), The plastic nut (600) is a slotted plastic nut, and a circumferential ring groove (601) or a helical groove (602) is formed on the inner wall surface or the outer wall surface of the plastic nut (600). 2), When a circumferential ring groove (601) is formed on the inner wall surface or the outer wall surface of the plastic nut (600): a, The plastic nut (600) has a ring groove type plastic nut structure, and the ring groove type plastic nut structure is composed of at least one or more circumferential ring grooves (601) formed on the inner wall surface or the outer wall surface of the plastic nut (600). b. The circumferential annular groove (601) divides the plastic nut (600) into an annular-groove type plastic nut (D1, D2, …, D n ) with at least two or more circumferential wall annular segments and their bases connected to each other, where n≥2 and n is a positive integer. The groove widths (C1, C2, …, C n ) of the circumferential annular grooves (601) are all greater than 0.05 mm. c, for the circumferential groove type plastic nuts (D1, D2, …, D n ), the length of each circumferential wall annular segment is between 5 and 80 mm, d, the remaining thickness H of the wall thickness between the bottom of the circumferential annular groove (601) and the minor diameter of the external thread of the annular groove type plastic nut (D1, D2, …, D n ) is ≤ 4.0 mm, or the remaining thickness I of the wall thickness between the bottom of the circumferential annular groove (601) and the major diameter of the internal thread of the annular groove type plastic nut (D1, D2, …, D n ) is ≤ 3.0 mm; e, each circumferential wall annular segment of the annular groove plastic nut (D1, D2,..., D n ) is fixedly connected to the metal pipe (800) simultaneously; Or, when a helical groove (602) is formed on the inner wall surface or the outer wall surface of the plastic nut (600): a', The plastic nut (600) has a helical groove type plastic nut structure. The helical groove type plastic nut structure is a helical groove type plastic nut composed of at least one or more helical grooves (602) formed on the inner wall surface or the outer wall surface of the plastic nut (600). The distance from one groove end of the helical groove (602) to an adjacent end face of the helical groove type plastic nut is S1, and the distance from the other groove end to an adjacent other end face of the helical groove type plastic nut is S2, and S1 ≤ 80 mm, S2 ≤ 80 mm. b', The winding angle of the helical groove (602) of the helical groove type plastic nut is greater than or equal to 360 degrees, and the groove width C of the helical groove (602) is greater than 0.05 mm. c', The pitch S of the helical groove (602) is between 5 and 80 mm. d', the remaining thickness H of the wall thickness between the bottom of the spiral groove (602) and the minor diameter of the external thread of the spiral groove type plastic nut is ≤ 4.0 mm, or the remaining thickness I of the wall thickness between the bottom of the spiral groove (602) and the major diameter of the internal thread of the spiral groove type plastic nut is ≤ 3.0 mm. e', the spiral groove type plastic nut is fixedly connected to one end of the metal pipe (800).

2. The grooved push rod device using a plastic nut according to claim 1, characterized in that: When a circumferential ring groove (601) is formed on the inner wall surface or the outer wall surface of the plastic nut (600): The external threads of the circumferential wall annular segments of the ring groove type plastic nuts (D1, D2, …, D n ) are simultaneously threadedly fixedly connected to the metal pipe (800), or the circumferential wall annular segments of the ring groove type plastic nuts (D1, D2, …, D n ) are simultaneously fixedly connected to one end of the metal pipe (800) by pins and / or screws, or among the circumferential wall annular segments of the ring groove type plastic nuts (D1, D2, …, D n ), some of the circumferential wall annular segments are fixedly connected to one end of the metal pipe (800) by pins and / or screws while the remaining circumferential wall annular segments are threadedly fixedly connected to one end of the metal pipe (800); Or, when a spiral groove (602) is formed on the inner wall surface or the outer wall surface of the plastic nut (600): The external thread of the spiral groove type plastic nut is threadedly and fixedly connected to one end of the metal pipe (800); or the spiral groove type plastic nut is fixedly connected to one end of the metal pipe (800) by a pin and / or a screw, or a part of the spiral groove type plastic nut is fixedly connected to one end of the metal pipe (800) by a pin and / or a screw while the remaining part is threadedly and fixedly connected to one end of the metal pipe (800).

3. The grooved push rod device using a plastic nut according to claim 1, wherein: It also has a driving motor (100), 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 speed reduction box body, an integrally formed annular boss (111) is provided on the outer end surface of the motor end cover (110) of the driving motor (100), a cap (130) is installed on the input shaft (120) of the driving motor (100), the shape of the central hole of the cap (130) coincides with the cross-sectional shape of the corresponding mating part of the input shaft (120), the cap (130) has a groove matching with 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 type oil blocking structure.

4. The grooved push rod device using plastic nuts according to claim 1, characterized in that, The speed reduction box body is provided with a housing mounting head (901) or a metal dust-proof pipe with a housing mounting head (901), and the other end of the metal pipe (800) is provided with a pipe wall connection hole or is fixedly connected to a metal pipe mounting head (902).

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

6. The grooved push rod device using a plastic nut according to claim 1, wherein: The helix angle Ψ of the internal thread of the plastic nut (600) is ≤ 2.90°, and the lead screw (500) has an external thread matching with the helix angle Ψ of the internal thread of the plastic nut (600).

7. A processing method of a grooved push rod device using a plastic nut as described in any one of claims 1-6, characterized in that: In the grooved push rod device using plastic nuts, the external threads of the circumferential wall annular segments of the annular groove type plastic nut (D1, D2, …, D n ) of the annular groove type plastic nut structure are simultaneously threadedly and fixedly connected to one end of the metal tube (800) through the following processing steps: Step 1: Make the outer circumference of the blank of the plastic nut (600) into an external thread matching with the internal thread at one end of the metal pipe (800). Step 2: Machine at least one or more circumferential annular grooves (601) on the outer wall surface of the plastic nut (600) blank. The circumferential annular grooves (601) divide the plastic nut (600) into an annular groove type plastic nut (D1, D2, …, D n ) with at least two or more circumferential wall annular segments and their bases connected to each other. The length of each circumferential wall annular segment of the annular groove type plastic nut (D1, D2, …, D n ) is between 5 and 80 mm. The groove widths (C1, C2, …, C n ) of the circumferential annular grooves (601) are all greater than 0.05 mm. The remaining thickness I of the wall thickness between the bottom of the circumferential annular groove (601) and the major diameter of the internal thread of the annular groove type plastic nut (D1, D2, …, D n ) is ≤ 3.0 mm; Step 3: Apply adhesive glue on the outer wall surface of the plastic nut (600) blank. The adhesive glue is a thread fastening glue. Rotate and install it into one end of the metal tube (800) so that the plastic nut (600) blank can reach the set screwing position at one end of the metal tube (800) and is thread-fastened to one end of the metal tube (800). Step 4: After the glue solidifies, clamp the outer circle of the metal tube, and process the blank of the plastic nut (600) into an internal thread that matches the external thread of the lead screw (500); the processing of the external threads of the circumferential wall annular segments of each section of the ring groove type plastic nut (D1, D2, …, D n ) and the threaded fixed connection of one end of the metal tube (800) are completed.

8. A processing method of a grooved push rod device using a plastic nut as described in any one of claims 1-6, characterized in that: In the grooved push rod device using plastic nuts, the external threads of the circumferential wall annular segments of the annular groove type plastic nut (D1, D2, …, D n ) of the annular groove type plastic nut structure are simultaneously threadedly and fixedly connected to one end of the metal tube (800) through the following processing steps: Step 1: Make the outer circumference of the plastic nut (600) blank into an external thread that matches the internal thread at one end of the metal tube (800). Step 2: Apply adhesive glue on the outer wall surface of the plastic nut (600) blank. The adhesive glue is a thread fastening glue. Rotate and install it into one end of the metal tube (800) so that the plastic nut (600) blank can reach the set screwing position at one end of the metal tube (800) and is thread-fastened to one end of the metal tube (800). Step 3: After the glue solidifies, clamp the outer circle of the metal pipe, machine the inner thread small-diameter hole of the blank of the plastic nut (600), and then machine at least one or more circumferential annular grooves (601) on the inner wall surface of the inner thread small-diameter hole. The circumferential annular groove (601) divides the plastic nut 600 into a grooved plastic nut (D1, D2, …, D n ) with at least two or more circumferential wall annular segments and their bases connected to each other. n The length of each circumferential wall annular segment of the grooved plastic nut (D1, D2, …, D n ) is between 5 and 80 mm. The groove widths (C1, C2, …, C n ) of each circumferential annular groove (601) are all greater than 0.05 mm. The remaining thickness H of the wall thickness between the groove bottom of the circumferential annular groove (601) and the outer thread small diameter of the grooved plastic nut (D1, D2, …, D n ) is ≤ 4.0 mm. Step 4: Process the blank of the plastic nut (600) into an internal thread that matches the external thread of the lead screw (500). The processing of the external threads of the circumferential wall annular segments of each section of the annular groove type plastic nut (D1, D2, …, D n ) being threadedly fixed to one end of the metal tube (800) is completed.

9. A processing method of a grooved push rod device using a plastic nut as described in any one of claims 1-6, characterized in that: The processing steps for the external thread of the spiral groove type plastic nut in the spiral groove type plastic nut structure of the grooved push rod device using a plastic nut to be thread-fixedly connected to one end of the metal tube (800) are as follows: Step 1: Make the outer circumference of the plastic nut (600) blank into an external thread that matches the internal thread at one end of the metal tube (800). Step 2: Cut at least one or more spiral grooves (602) on the outer wall surface of the plastic nut (600) blank. The distance from one end of the spiral groove (602) to an adjacent end face of the spiral groove type plastic nut is S1, and the distance from the other end of the spiral groove to the other adjacent end face of the spiral groove type plastic nut is S2, and S1 ≤ 80 mm, S2 ≤ 80 mm. The angle that the spiral groove (602) winds is greater than or equal to 360 degrees. The groove width C of the spiral groove (602) is greater than 0.05 mm. The pitch S of the spiral groove (602) is between 5 and 80 mm. The remaining thickness I of the wall thickness between the bottom of the circumferential ring groove (602) and the major diameter of the internal thread of the spiral groove type plastic nut is ≤ 3.0 mm. Step 3: Apply adhesive glue on the outer wall surface of the plastic nut (600) blank. The adhesive glue is a thread fastening glue. Rotate and install it into one end of the metal tube (800) so that the plastic nut (600) blank can reach the set screwing position at one end of the metal tube (800) and is thread-fastened to one end of the metal tube (800). Step 4: After the glue solidifies, clamp the outer circle of the metal tube and machine the plastic nut (600) blank into an internal thread that matches the external thread of the lead screw (500). The processing of the external thread of the spiral groove type plastic nut being thread-fixedly connected to one end of the metal tube (800) is completed.

10. A processing method of a slotted push rod device using a plastic nut as described in any one of claims 1-6, characterized in that: The processing steps for the external thread of the spiral groove type plastic nut in the spiral groove type plastic nut structure of the grooved push rod device using a plastic nut to be thread-fixedly connected to one end of the metal tube (800) are as follows: Step 1: Make the outer circumference of the blank of the plastic nut (600) into an external thread that matches the internal thread at one end of the metal tube (800). Step 2: Apply adhesive glue to the outer wall surface of the blank of the plastic nut (600). The adhesive glue is a thread fastening glue. Then rotate and install it into the internal thread at one end of the metal tube (800) so that the blank of the plastic nut (600) can reach the set screwing position at one end of the metal tube (800) and be thread-fastened to the internal thread at one end of the metal tube (800). Step 3: After the glue solidifies, clamp the outer circumference of the metal tube and machine the minor diameter hole of the internal thread of the blank of the plastic nut (600). Then machine at least one or more spiral grooves (602) on the inner wall surface of the minor diameter hole of the internal thread. The distance from one end of the spiral groove (602) to an adjacent end face of the spiral groove type plastic nut is S1, and the distance from the other end of the spiral groove to the other adjacent end face of the spiral groove type plastic nut is S2, and S1 ≤ 80 mm, S2 ≤ 80 mm. The winding angle of the spiral groove (602) is greater than or equal to 360 degrees. The groove width C of the spiral groove (602) is greater than 0.05 mm. The pitch S of the spiral groove (602) is between 5 and 80 mm. The remaining thickness H of the wall thickness between the bottom of the spiral groove (602) and the minor diameter of the external thread of the spiral groove type plastic nut is ≤ 4.0 mm. Step 4: Machine the blank of the plastic nut (600) into an internal thread that matches the external thread of the lead screw (500), and the processing of thread-fixing the external thread of the spiral groove type plastic nut to one end of the metal tube (800) is completed.

Images