Fixed protection tool for adjusting moment of lead screw assembly of speed reducer

Abstract

The utility model provides a fixing and protecting tool for adjusting the torque of a speed reducer lead screw assembly. The fixing and protecting tool comprises a fixing tool and a protecting tool, a speed reducer lead screw assembly is installed in the fixing tool in an embedded mode; the fixing tool forms a complete placing and clamping plane used for filling up the height difference of all structures of the lead screw assembly, and the lead screw assembly and the fixing tool are attached, limited and matched to limit rotation of a lead screw sliding block and swing of a lead screw shell. The protection tool is composed of a handle and a head portion, and the head portion is used for adjusting a thin pressing nut in a speed reducer lead screw assembly and does not interfere with installation of a thick pressing nut or touch a lead screw shell hole opening. The tool is used for improving the efficiency in the assembling process and protecting the appearance of the assembly, is simple in structure, convenient to install, safe to use and long in service life, greatly improves the torque adjusting efficiency of the speed reducer lead screw assembly, effectively protects the assembly in the adjusting process, and is suitable for popularization.

Description

Technical Field

[0001] This utility model specifically relates to a fixing and protective fixture for adjusting the torque of a reducer lead screw assembly. Background Technology

[0002] Reducer screw assemblies can meet the working needs of mechanical equipment by reducing speed and increasing torque. The reducer typically consists of multiple gears of different sizes, which mesh to reduce speed and increase output torque; the screw relies on the rotation and movement of its helix to convert rotary motion into linear motion. This type of assembly is widely used in specialized fields such as material handling, lifting and transportation, military applications, and robot joints.

[0003] As shown in Figure 1, before use, the tightening torque of the thin-pressure nut 4 and the thick-pressure nut 2, as well as the starting torque of the screw 102, directly affect the starting performance and load capacity of the reducer screw assembly. If the starting torque of the screw 102 is too small, the system will not be able to effectively drive the load, resulting in insufficient force. Therefore, in the reducer, the adjustment of the starting torque of the screw assembly is particularly critical. A reasonable and accurate starting torque of the screw assembly is essential to ensuring the stable operation and efficient work of the mechanical system.

[0004] In the existing technology, during the assembly process of the reducer screw assembly shown in Figure 1, the starting torque of the screw assembly 1 is required to be 0.2 N·m to 0.4 N·m. Before testing the starting torque of the screw assembly 1, the rotational tightening torque of the thick-pressure nut 2 must first be 23 N·m before the starting torque of the screw assembly 1 can be measured. Only after the starting torque of the screw assembly 1 meets the standard can the next process be carried out. If the starting torque of the screw assembly 1 does not meet the required value, the thick-pressure nut 2 and the washer 3 must be loosened first, and then the tightness of the thin-pressure nut 4 must be adjusted. Then the thick-pressure nut 2 is tightened again, and the rotational tightening torque of the thick-pressure nut 2 is ensured to be 23 N·m. After that, the starting torque of the screw assembly 1 is measured again. Therefore, it is necessary to repeatedly loosen, tighten, and adjust the thin-pressure nut 4 until the final starting torque of the screw 102 of the screw assembly 1 reaches the standard of 0.2 N·m to 0.4 N·m.

[0005] As can be seen, the assembly process of the reducer screw assembly shown in Figure 1 under the existing technology has the following problems: ① The screw slider 103 will rotate; ② The screw housing 101 and the screw assembly 1 have a height difference and no regular plane, so when adjusting the torque, the screw housing 101 will swing randomly, which is very inconvenient and requires two people to adjust, which is time-consuming and laborious; ③ When adjusting the torque, the screw housing 101 will experience wear and discoloration; ④ When adjusting the thin-pressure nut 4, because the thin-pressure nut 4 is located inside the hole of the screw housing 101, it is very easy to touch and interfere with the screw housing 101 and damage it when using an ordinary wrench. In view of this, the following improved technical solution is proposed. Utility Model Content

[0006] The technical problem solved by this utility model is to provide a fixed protective fixture for adjusting the torque of a reducer screw assembly, which solves the technical problems of easy rotation of the screw slider, easy swinging of the screw housing, need for multiple people to cooperate in adjustment, time-consuming and labor-intensive adjustment, and easy wear of the screw housing when adjusting the torque of the reducer screw assembly as shown in Figure 1.

[0007] The technical solution adopted by this utility model is as follows: a fixing and protective fixture for adjusting the torque of a reducer screw assembly, the fixing and protective fixture including a fixing fixture and a protective tool; the fixing fixture is embedded in the reducer screw assembly; the fixing fixture forms a complete placement and clamping plane to fill the height difference of each structure of the screw assembly, wherein the screw assembly is fitted and limited by the fixing fixture, thereby restricting the rotation of the screw slider in the screw assembly and restricting the swing of the screw housing; the protective tool consists of a handle and a head, the head being used to adjust the thin pressure nut in the reducer screw assembly without interfering with the installation of the thick pressure nut or touching the screw housing orifice.

[0008] In the above technical solution, further: the fixed fixture has a cuboid shape; the fixed fixture has a track-type keyway structure formed by L1 and L2, which is used to adapt to the slider key on the lead screw slider to prevent the lead screw slider from rotating; the cavity I formed by D1, L1, and L2 has a clearance fit with the lead screw slider; the cavity II formed by L6, R2, R7, and 2-R5 of the fixed fixture is used to fill the structural height difference of the lead screw assembly; the cavity II and the lead screw housing have a single-sided outer contour dimension. A 0.5mm gap is left to form a protective cavity for the lead screw housing; the cavity III formed by D2 and L7 of the fixing fixture is adapted to the locking boss of the lead screw housing for positioning the lead screw assembly; the fixing fixture has 2-M5 deep threaded holes symmetrical on the left and right axes, the 2-M5 deep threaded holes are aligned with the screw holes of the lead screw housing, and the lead screw housing is fastened to the fixing fixture with screws; the lead screw assembly is embedded in the fixing fixture to ensure that the appearance of the reducer lead screw assembly is not worn or faded.

[0009] In the above technical solution, further: the handle and the head are integrally formed; the head has a small-diameter annular embedded boss, the gap of which is adapted to fit into the inner hole of the lead screw housing; the center of the embedded boss has an internal hexagonal through hole, the gap of which is adapted to the outer edge of the thin-pressure nut for rotating and adjusting the thin-pressure nut, while the internal hexagonal through hole does not affect the installation of the thick-pressure nut; and the internal hexagonal wrench can be inserted into the internal hexagonal countersunk hole in the center of the lead screw to fix or rotate the lead screw.

[0010] In the above technical solution, further: the internal hexagonal through hole size L01 is clearance-fitted with the outer dimensions of the thin-walled nut; the head height size L02 is less than the corner height when the internal hexagonal wrench is inserted; the inner diameter size D01 of the inserted boss is greater than the bearing inner ring size, and the outer diameter size D02 of the inserted boss is less than the inner diameter of the lead screw housing end face.

[0011] In the above technical solution, the fixing fixture is further made of aluminum alloy.

[0012] In the above technical solution, the thin-pressure nut is further described as a steel component.

[0013] Advantages of this utility model compared to the prior art:

[0014] 1. After being fixed by using flat-jaw pliers, the fixing fixture of this utility model can restrict the rotation of the lead screw slider. When adjusting the torque, the fixing fixture can also restrict the free swing of the lead screw housing. No multiple people are required to adjust it. Only one person is needed to operate it to adjust the tightening torque of the thick pressure nut and the starting torque of the lead screw, and the adjustment is time-saving and labor-saving. The embedded structure effectively avoids wear and discoloration of the lead screw housing when adjusting the torque. Especially when adjusting the thin pressure nut, the use of protective tools can prevent the protective tools from damaging the orifice of the lead screw housing.

[0015] 2. This utility model has a simple structure and can realize the assembly, fixing and convenient adjustment of the tightening torque of the thick pressure nut and the starting torque of the lead screw, which greatly improves the production and assembly efficiency and achieves the effect of ensuring quality and delivery.

[0016] 3. This utility model tooling has a simple structure, is easy to install, safe to use, and has a long service life. It greatly improves the efficiency of torque adjustment of the reducer screw assembly and effectively protects the components during the adjustment process, making it suitable for widespread application. Attached Figure Description

[0017] Figure 1(a) is a perspective view of the reducer lead screw assembly;

[0018] Figure 1(b) is a cross-sectional view of the reducer lead screw assembly;

[0019] Figure 2(a) is a perspective view of the fixing fixture of this utility model;

[0020] Figure 2(b) is a front view of the fixing fixture of this utility model;

[0021] Figure 2(c) is a cross-sectional view of the fixed fixture in Figure 2(b);

[0022] Figure 3(a) is a cross-sectional view of the protective tool of this utility model;

[0023] Figure 3(b) is a front view of the protective tool of this utility model;

[0024] Figure 4(a) is a perspective view of the reducer screw assembly after the fixed tooling of this utility model is installed;

[0025] Figure 4(b) is a top view of the reducer screw assembly after the fixed tooling in Figure 4(a) is installed;

[0026] Figure 4(c) is a cross-sectional view of the reducer screw assembly after the fixed tooling in Figure 4(b) is installed;

[0027] Figure 5 This is a schematic diagram illustrating the adjustment of the thick-pressure nut of this utility model;

[0028] Figure 6(a) is a schematic diagram of the starting torque adjustment of the lead screw assembly of this utility model;

[0029] Figure 6(b) is a three-dimensional view of the thin-pressure nut adjustment after the starting torque of the lead screw assembly fails to meet the standard;

[0030] Figure 6(c) is a cross-sectional view of the thin-pressure nut in Figure 6(b) during adjustment;

[0031] In the diagram: 1-Lead screw assembly, 101-Lead screw housing, 1011-Lead screw housing retaining structure, 1012-M5 screw hole, 102-Lead screw, 1021-Hexagonal countersunk hole, 1022-Lead screw external teeth, 103-Lead screw slider, 1031-Slider key, 2-Thick pressure nut, 3-Washer, 4-Thin pressure nut, 5-Bearing, 6-Fixed fixture, 601-Railway keyway structure, 602-Cavity I, 603-Cavity II, 6031-0.5mm clearance, 604-Cavity III, 605-2-M5 deep thread hole, 7-Protective tool, 701-Handle, 702-Head, 7021-Embedded boss, 7022-Hexagonal through hole, 8-Hexagonal wrench, 9-Standard 19mm size wrench, 10-Torque wrench, 11-Digital torque screwdriver. Detailed Implementation

[0032] The technical solutions of the present utility model will be clearly and completely described below with reference to Figures 1-6 in the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0033] First, regarding the reducer screw assembly shown in Figures 1(a) and 1(b), it should be noted that: this utility model is designed based on the reducer screw assembly shown in Figure 1, which includes a screw assembly 1; the screw assembly 1 includes a screw housing 101, a split-type screw 102, and a screw slider 103; wherein, the middle optical shaft portion of the split-type screw 102 is rotatably supported and mounted in the screw housing 101 by a bearing 5, and the left end of the split-type screw 102 is screwed... Thin-pressure nut 4, washer 3, and thick-pressure nut 2 are sequentially installed on the threaded part. The thin-pressure nut 4, washer 3, and thick-pressure nut 2 coaxially and fixedly connect the split-structure lead screw 102 into a whole and are used to adjust the torque of the split-structure lead screw 102. The right end of the split-structure lead screw 102 is externally threaded and fitted with a lead screw slider 103. The lead screw 102 and lead screw slider 103 form a lead screw nut helical pair, which converts the rotational motion of the lead screw 102 into the linear displacement motion of the lead screw slider 103. The lead screw slider 103 is provided with a slider key 1031. At the same time, the T-shaped outer circle of the split-structure rotating lead screw 102 is provided with lead screw external teeth 1022. The lead screw external teeth 1022 are fitted with the inner hole of the right end of the lead screw housing 101. The lead screw external teeth 1022 also serve as the driven gear of the reducer gear set to realize the reduction transmission. The driving gear is not shown. It should be added that the center of the threaded portion of the left end of the lead screw 102 has a hexagonal countersunk hole 1021, into which an internal hexagonal wrench 8 can be inserted to fix or rotate the lead screw 102. The lead screw housing 101 has an irregular, non-coplanar structure, and has M5 screw holes 1012 that are symmetrical about the left and right axes; the bottom end of the lead screw housing 101 also has a lead screw housing locking structure 1011.

[0034] To address this issue, and to adjust the tightening torque of the thin-pressure nut 4 and the thick-pressure nut 2, as shown in Figure 1, as well as the starting torque of the lead screw 102, this invention provides a fixing and protective fixture for adjusting the torque of the reducer lead screw assembly. The fixing and protective fixture includes a fixing fixture 6 and a protective tool 7. The fixing fixture 6 is shown in Figures 2(a), 2(b), and 2(c); the protective tool is shown in Figures 3(a) and 3(b).

[0035] As shown in Figures 4(a), 4(b), and 4(c), the fixing fixture 6 is embedded in the reducer screw assembly; the fixing fixture 6 forms a complete placement and clamping plane to fill the height difference of each structure of the screw assembly 1, wherein the screw assembly 1 is fitted and limited by the fixing fixture 6, thereby restricting the rotation of the screw slider 103 in the screw assembly 1 and restricting the swing of the screw housing 101.

[0036] It should be noted that the structure of the fixed fixture 6 forms a complete placement and clamping plane, used to fill the height differences between the various structures of the lead screw assembly 1. In actual reducer lead screw assemblies, due to differences in the design and manufacturing of various structures, there may be inconsistencies in height, which can lead to instability and inaccuracy during torque adjustment and other operations. The fixed fixture 6 fills these height differences, providing a flat and stable operating platform for the entire lead screw assembly. The fit and limiting adaptation between the lead screw assembly 1 and the fixed fixture 6 brings two important technical advantages. First, it restricts the rotation of the lead screw slider 103. When adjusting the torque of the reducer lead screw assembly, the rotation of the lead screw slider 103 may interfere with the normal torque adjustment process, leading to inaccurate torque adjustment or unexpected situations. Through the fit and limiting adaptation between the fixed fixture 6 and the lead screw assembly 1, the rotation of the lead screw slider 103 can be effectively prevented, ensuring the smooth progress of torque adjustment. Second, it restricts the swing of the lead screw housing 101. The oscillation of the lead screw housing 101 also affects the accuracy and stability of torque adjustment. The limiting and adapting function of the fixed fixture 6 can prevent unnecessary oscillation of the lead screw housing 101, thereby improving the reliability and accuracy of the entire torque adjustment process.

[0037] In the above embodiments, further: the fixing fixture 6 has a cuboid structure; the cuboid has a height of L3, a width of L4, and a length of L5; the fixing fixture 6 has a track-type keyway structure 601 formed by L1 and L2, the track-type keyway structure 601 is used to adapt to and limit the slider key 1031 on the lead screw slider 103 to prevent the lead screw slider 103 from rotating. The cavity I 602 formed by D1, L1, and L2 is clearance-fitted with the lead screw slider 103; the cavity II 603 formed by L6, R2, R7, and 2-R5 of the fixing fixture 6 is used to fill the structural height difference of the lead screw assembly 1. The cavity II 603 and the outer contour dimension of the lead screw housing 101 have a 0.5mm gap 6031 on one side, forming a protective cavity for the lead screw housing 101. The cavity III 604 formed by D2 and L7 of the fixing fixture 6 is adapted to the lead screw housing retaining boss 1011 for positioning the lead screw assembly 1. The fixing fixture 6 has symmetrical 2-M5 deep threaded holes 605 on the left and right axes. The 2-M5 deep threaded holes 605 are aligned with the M5 screw holes 1012 on the lead screw housing 101, and the lead screw housing 101 is fastened to the fixing fixture 6 with M5×12 screws. The lead screw assembly 1 is embedded in the fixing fixture 6 to ensure that the appearance of the reducer lead screw assembly is not worn or faded.

[0038] It should be noted that the fixed fixture 6 has a rectangular parallelepiped structure with clearly defined length, width, and height dimensions, which are L5 (length), L4 (width), and L3 (height). This regular rectangular parallelepiped structure facilitates manufacturing and provides a stable foundation for subsequent mating with the lead screw assembly 1. The fixed fixture 6 has a track-type keyway structure 601 formed by L1 and L2. This structure is specifically designed to accommodate and limit the slider key 1031 on the lead screw slider 103. During the torque adjustment process of the reducer lead screw assembly, the rotation of the lead screw slider 103 can seriously affect the accuracy and stability of the adjustment. The mating of the track-type keyway structure 601 and the slider key 1031 can effectively prevent the rotation of the lead screw slider 103, ensuring the smooth progress of the torque adjustment process. The cavity I 602 formed by D1, L1, and L2 has a clearance fit with the lead screw slider 103. The clearance fit design ensures that the lead screw slider 103 can be smoothly embedded in the fixed fixture 6, while also restricting other degrees of freedom of the lead screw slider 103 to a certain extent. The auxiliary track-type keyway structure 601 better fulfills its limiting function for the lead screw slider 103. The cavity II 603 formed by L6, R2, R7, and 2-R5 in the fixed fixture 6 is used to fill the structural height difference of the lead screw assembly 1. In the lead screw assembly 1, due to differences in the design and manufacturing of various components, there may be inconsistencies in height, which can lead to instability during torque adjustment. The design of cavity II 603 effectively solves this problem, providing a flat installation environment for the lead screw assembly 1. A 0.5mm gap 6031 is left on one side between cavity II 603 and the outer contour dimension of the lead screw housing 101, forming a protective cavity for the lead screw housing 101. The 0.5mm gap ensures that the lead screw housing 101 can be smoothly embedded in the cavity II 603, while also preventing wear and other problems caused by excessive tightness between the lead screw housing 101 and the fixed fixture 6. Simultaneously, the protective cavity provides additional protection for the lead screw housing 101, preventing damage from external factors during torque adjustment. The cavity III 604 formed by D2 and L7 in the fixed fixture 6 is adapted to the lead screw housing retaining boss 1011 for positioning the lead screw assembly 1. The adaptation between the lead screw housing retaining boss 1011 and the cavity III 604 accurately determines the position of the lead screw assembly 1 in the fixed fixture 6, ensuring the relative positional accuracy between the lead screw assembly 1 and the fixed fixture 6, thus providing an accurate reference for subsequent torque adjustment. The fixed fixture 6 has two M5 deep threaded holes 605 symmetrically arranged on both sides of the axis. These holes 605 are aligned with the M5 screw holes 1012 on the lead screw housing 101, and the lead screw housing 101 is securely connected to the fixed fixture 6 using M5×12 screws. This secure connection ensures a stable connection between the lead screw assembly 1 and the fixed fixture 6 during torque adjustment, preventing loosening from affecting the accuracy and stability of torque adjustment. The lead screw assembly 1 is fully embedded in the fixed fixture 6; this design ensures that the reducer lead screw assembly's appearance does not wear or fade.During torque adjustment, the lead screw assembly 1 may be subjected to collisions, friction, or other impacts from external objects, resulting in damage to its appearance. The overall embedded protection of the fixing fixture 6 effectively prevents these situations from occurring, maintaining the appearance integrity and aesthetics of the lead screw assembly 1.

[0039] As shown in Figures 6(b) and 6(c), the protective tool 7 consists of a handle 701 and a head 702. The head 702 is used to adjust the thin pressure nut 4 in the reducer screw assembly, without interfering with the installation of the thick pressure nut 2 or with touching the screw housing 101 orifice.

[0040] It should be noted that, as shown in Figures 6(b) and 6(c), the protective tool 7 consists of a handle 701 and a head 702. The handle 701 provides a gripping area for the operator, facilitating the application of force. The head 702 is the key working part of the protective tool 7, used to contact and adjust the thin-pressure nut 4 in the reducer screw assembly. The head 702 is used to adjust the thin-pressure nut 4 in the reducer screw assembly without interfering with the installation of the thick-pressure nut 2 or touching the orifice of the screw housing 101. In the actual reducer screw assembly, the thin-pressure nut 4 and the thick-pressure nut 2 have different positions and functions. The head 702 of the protective tool 7 is designed to precisely act on the thin-pressure nut 4 while avoiding interference with the installation of the thick-pressure nut 2 and without touching the orifice of the screw housing 101, thus ensuring the normal structure and function of the reducer screw assembly and improving the efficiency and accuracy of torque adjustment.

[0041] In the above embodiments, further: the handle 701 and the head 702 are integrally formed; the head 702 has a small-diameter annular embedded boss 7021, the embedded boss 7021 being fitted into the inner hole of the lead screw housing 101 with a gap; the embedded boss 7021 has an internal hexagonal through hole 7022 at its center, the internal hexagonal through hole 7022 being fitted into the outer edge of the thin pressure nut 4 with a gap for rotating and adjusting the thin pressure nut 4, while the internal hexagonal through hole 7022 does not affect the installation of the thick pressure nut 2; and the internal hexagonal wrench 8 can be inserted into the internal hexagonal countersunk hole 1021 at the center of the lead screw 102 to fix or rotate the lead screw 102.

[0042] That is, the size L01 of the internal hexagonal through hole 7022 is clearance-fitted with the outer dimensions of the thin-walled nut 4; the height L02 of the head 702 is smaller than the corner height when the internal hexagonal wrench 8 is inserted. To ensure that the protective tool 7 can rotate flexibly after the head 702 is inserted, and to provide external protection for the lead screw housing 101: the inner diameter D01 of the insertion boss 7021 is larger than the inner ring size of the bearing 5, and the outer diameter D02 of the insertion boss 7021 is smaller than the inner diameter of the end face of the lead screw housing 101; a gap is left between the D01 and D02 steps of the head 702 and the inner diameter of the end face of the lead screw housing 101.

[0043] It should be noted that the handle 701 and head 702 are integrally molded, a design that offers numerous advantages. The integral molding structure ensures the overall strength and stability of the protective tool 7, preventing potential loosening or breakage at the connection points, ensuring reliable force transmission during operation, and improving the tool's lifespan and reliability. The head 702 features a small-diameter annular embedded boss 7021, whose clearance is adapted to fit into the inner hole of the lead screw housing 101. This design allows the protective tool 7 to be accurately embedded in the lead screw housing 101, providing a stable positioning base for subsequent operations and preventing the protective tool 7 from shifting during operation to a certain extent. The embedded boss 7021 has a hexagonal through hole 7022 at its center, which is clearance-fitted to the outer edge of the thin-pressure nut 4 for rotating and adjusting the thin-pressure nut 4. This clearance fit design ensures that the protective tool 7 can smoothly engage with the thin-pressure nut 4 while providing sufficient room for movement during rotation, reducing wear and jamming caused by excessive tightness. Meanwhile, the internal hexagonal through hole 7022 does not affect the installation of the thick-pressure nut 2, demonstrating the precision and independence of the design in terms of function. The size L01 of the internal hexagonal through hole 7022 is clearance-fitted with the outer dimensions of the thin-pressure nut 4. This precise dimensional fit ensures that when the protective tool 7 rotates the thin-pressure nut 4, the force can be evenly and effectively transmitted to the thin-pressure nut 4, achieving precise adjustment, while avoiding problems such as damage to the thin-pressure nut 4 or inaccurate adjustment due to improper fit. The height dimension L02 of the head 702 is smaller than the corner height when the internal hexagonal wrench 8 is inserted. This design allows the internal hexagonal wrench 8 to be smoothly inserted into the internal hexagonal countersunk hole 1021 in the center of the screw 102 to fix or rotate the screw 102 during operation, without being interfered with by the head 702, ensuring the flexibility and convenience of operation. The protective tool 7, through its one-piece molded structure, unique embedded boss 7021 and internal hexagonal through hole 7022 design, and precise dimensional fit, achieves accurate adjustment of the thin-pressure nut 4 without affecting the installation of the thick-pressure nut 2 and the operation of the lead screw 102. Furthermore, this design ensures that the protective tool 7 can rotate freely and provides effective external protection for the lead screw housing 101, demonstrating significant technical advantages and practical value.

[0044] In the above embodiments, the fixing fixture 6 is further made of aluminum alloy. Aluminum alloy is corrosion-resistant, lightweight, easy to process, and wear-resistant.

[0045] In the above embodiments, furthermore, the thin-pressure nut 4 is made of steel. Using steel provides high strength and wear resistance. The thin-pressure nut 4 plays a crucial role in the reducer screw assembly, needing to withstand certain pressure and torque. The steel thin-pressure nut 4 has high strength and can withstand large loads without deformation or damage. This allows the thin-pressure nut 4 to reliably fix and adjust related components in the screw assembly, ensuring the normal operation and stable performance of the screw assembly 1. During the long-term use of the screw assembly 1, the thin-pressure nut 4 will frequently move relative to components such as the screw 102, easily causing wear. The steel thin-pressure nut 4 has good wear resistance, resisting friction and wear to a certain extent, extending its service life. This helps reduce the replacement frequency of the thin-pressure nut 4, lowering maintenance costs and ensuring the long-term stable operation of the screw assembly 1.

[0046] The working principle of this utility model includes the following steps:

[0047] Step 1: As shown in Figure 4(a), install the lead screw assembly 1 with the torque to be adjusted onto the fixed fixture 6.

[0048] Step 1 includes the following steps:

[0049] Step 101: First, fix the fixture 6 onto the flat-jaw vise. Then, pick up the lead screw assembly 1 and align the slider key 1031 in the lead screw assembly 1 with the track-type keyway structure 601 of the fixture 6.

[0050] Step 102: Adjust the lead screw housing retaining boss 1011 so that the lead screw housing retaining boss 1011 is embedded in the fixing fixture 6. Rotate the lead screw housing 101 so that the M5 screw hole 1012 of the lead screw housing 101 is aligned with the 2-M5 deep thread hole 605 of the fixing fixture 6. Use M5×12 screws to fasten the lead screw assembly 1 to the fixing fixture 6.

[0051] Step 103: Insert the thin pressure nut 4, washer 3, and thick pressure nut 2 into the threaded end of the lead screw 102 in sequence.

[0052] Step 2: As Figure 5 As shown, the tightening torque of the thick-pressure nut 2 is adjusted using a standard 19-size wrench 9 and a torque wrench 10; wherein, the torque wrench 10 is inserted into the internal hexagonal countersunk hole 1021 of the lead screw 102 to ensure that the tightening torque of the thick-pressure nut 2 is 23 N·m.

[0053] Step 3: As shown in Figure 6(a), adjust the starting torque of the lead screw assembly 1 so that the starting torque of the lead screw assembly 1 is 0.2 N·m to 0.4 N·m to meet the standard.

[0054] Specifically, use a digital torque screwdriver 11 to insert into the internal hexagonal countersunk hole 1021 at the end of the lead screw 102 and rotate it to check whether the starting torque of the lead screw assembly 1 meets the standard of 0.2 N·m to 0.4 N·m. If it meets the standard, proceed to the next process; if it does not meet the standard, as shown in Figures 6(b) and 6(c), first loosen the thick pressure nut 2 and the washer 3, then use the protective tool 7 to adjust the tightness of the thin pressure nut 4, then tighten the thick pressure nut 2, return to step 2, the tightening torque of the thick pressure nut 2 remains unchanged at 23 N·m, and use the digital torque screwdriver 11 again to measure the starting torque until the starting torque meets the standard.

[0055] Step 4: After the torque of lead screw assembly 1 is adjusted, disassemble lead screw assembly 1, and then replace it with a new lead screw assembly 1 on the fixed fixture 6 for readjustment, so as to achieve efficient batch adjustment of lead screw assembly 1.

[0056] From the above description, it can be seen that: after the fixing fixture 6 of this utility model is fixed by using flat-jaw pliers, the rotation of the lead screw slider 103 can be restricted by the fixing fixture 6; when adjusting the torque, the fixing fixture 6 can also restrict the free swing of the lead screw housing 101; no multiple people are needed to cooperate in the adjustment, only one person is needed to operate to realize the adjustment of the tightening torque of the thick pressure nut 2 and the starting torque of the lead screw 102, and the adjustment is time-saving and labor-saving; the embedded structure of the lead screw assembly 1 effectively avoids wear and discoloration of the lead screw housing 101 when adjusting the torque; especially when adjusting the thin pressure nut 4, the protective tool 7 is used to adjust, which avoids damage to the orifice of the lead screw housing 101 when adjusting the thin pressure nut 4, and the thin pressure nut 4 can be rotated and adjusted flexibly.

[0057] This utility model has a simple structure and can realize the assembly, fixing and convenient adjustment of the tightening torque of the thick pressure nut 2 and the starting torque of the lead screw 102, which greatly improves the production and assembly efficiency and achieves the effect of ensuring quality and delivery.

[0058] In summary, this utility model tooling has a simple structure, is easy to install, safe to use, and has a long service life. It greatly improves the efficiency of torque adjustment of the reducer screw assembly and effectively protects the components during the adjustment process, making it suitable for widespread application.

[0059] The various embodiments in this specification are described in a related manner. The same or similar parts between the various embodiments can be referred to each other. Each embodiment focuses on describing the differences from other embodiments.

[0060] The above description is merely a preferred embodiment of the present utility model and is not intended to limit the scope of protection of the present utility model. Any modifications and equivalent substitutions made within the spirit and principles of the present utility model are included within the scope of protection of the present utility model.

Claims

1. A fixing and protective fixture for adjusting the torque of a reducer lead screw assembly, characterized in that: The fixed protective fixture includes a fixed fixture (6) and a protective tool (7); the fixed fixture (6) is embedded in the reducer screw assembly; the fixed fixture (6) forms a complete placement and clamping plane to fill the height difference of each structure of the screw assembly (1), wherein the screw assembly (1) is fitted and limited by the fixed fixture (6), thereby restricting the rotation of the screw slider (103) in the screw assembly (1) and restricting the swing of the screw housing (101); the protective tool (7) consists of a handle (701) and a head (702), the head (702) is used to adjust the thin pressure nut (4) in the reducer screw assembly, and does not interfere with the installation of the thick pressure nut (2), nor interfere with touching the hole of the screw housing (101).

2. The fixing and protective fixture according to claim 1, characterized in that: The fixed fixture (6) has a rectangular parallelepiped structure. The fixed fixture (6) has a track-type keyway structure (601) formed by L1 and L2. The track-type keyway structure (601) is used to adapt to the slider key (1031) on the lead screw slider (103) to prevent the lead screw slider (103) from rotating. The cavity I (602) formed by D1, L1 and L2 is clearance-fitted with the lead screw slider (103). The fixed fixture (6) is used to fill the structural height difference of the lead screw assembly (1) by forming a cavity II (603) surrounded by L6, R2, R7, and 2-R5; the cavity II (603) and the lead screw housing (101) have a 0.5mm gap (6031) on one side, forming a protective cavity for the lead screw housing (101); The fixed fixture (6) is adapted by the cavity Ⅲ (604) formed by D2 and L7 to the lead screw housing buckle boss (1011) for positioning the lead screw assembly (1); The fixed fixture (6) is provided with 2-M5 deep threaded holes (605) that are symmetrical about the left and right axes. The 2-M5 deep threaded holes (605) are aligned with the screw holes (1012) provided in the lead screw housing (101), and the lead screw housing (101) is fastened to the fixed fixture (6) using screws. The lead screw assembly (1) is embedded in the fixing fixture (6) to ensure that the appearance of the reducer lead screw assembly is not worn or faded.

3. The fixing and protective fixture according to claim 1, characterized in that: The handle (701) and head (702) are integrally formed; The head (702) has a small-diameter annular embedded boss (7021), the embedded boss (7021) is fitted into the inner hole of the screw housing (101) with a gap; the embedded boss (7021) has an internal hexagonal through hole (7022) at its center, the internal hexagonal through hole (7022) is fitted into the outer edge of the thin pressure nut (4) with a gap, and while the thin pressure nut (4) is rotated and adjusted, the internal hexagonal through hole (7022) does not affect the installation of the thick pressure nut (2); and the internal hexagonal wrench (8) can be inserted into the internal hexagonal countersunk hole (1021) at the center of the screw (102) to fix or rotate the screw (102).

4. The fixing and protective fixture according to claim 3, characterized in that: The size L01 of the internal hexagonal through hole (7022) is clearance-fitted with the outer dimensions of the thin pressure nut (4); the height L02 of the head (702) is less than the corner height when the internal hexagonal wrench (8) is inserted; the inner diameter D01 of the embedded boss (7021) is greater than the bearing inner ring size of the bearing (5); and the outer diameter D02 of the embedded boss (7021) is less than the inner diameter of the end face of the lead screw housing (101).

5. The fixing and protective fixture according to claim 1 or 2, characterized in that: The fixed fixture (6) is made of aluminum alloy.

6. The fixing and protective fixture according to claim 1, 3, or 4, characterized in that: The thin-pressure nut (4) is made of steel.

Images