Auxiliary installation tool

Abstract

The utility model provides an auxiliary installation tool. The auxiliary installation tool comprises a first end part; a second end; the connecting part is used for connecting the first end part and the second end part, the first end part and the second end part are cylindrical and have the same outer diameter, the cylindrical peripheries of the first end part and the second end part are respectively provided with a first spiral linear structure and a second spiral linear structure, and the first spiral linear structure is aligned with the second spiral linear structure. By aligning the first spiral linear structure with the second spiral linear structure, the internal threads of the two nuts positioned by the tool are also aligned, so that the internal threads of the two nuts for splicing are ensured to be accurately butted.

Description

TECHNICAL FIELD

[0001] The present disclosure relates to the technical field of machinery, and in particular to an auxiliary installation tool. BACKGROUND

[0002] The radial size of the reverse planetary roller screw is small, and the internal thread needs to be machined in the inner hole of the nut through precision machining. The process of precision machining determines that when the length-diameter ratio (nut length / nut diameter) is large, the machining difficulty is large, and even it cannot be machined, and a long nut cannot be directly realized. In the reverse planetary screw, the nut is rotated to drive the screw to move linearly, and the stroke of the reverse planetary screw depends on the length of the nut, so it is urgent to increase the length-diameter ratio of the nut. At present, the length of the nut can be increased by splicing multiple short nuts. However, in order to splice multiple short nuts into a long nut, it is necessary to ensure that the threads of each short nut are accurately connected, and at present, it is still impossible to realize accurate thread connection. CONTENT OF THE UTILITY MODEL

[0003] The present disclosure provides an auxiliary installation tool.

[0004] The present disclosure provides an auxiliary installation tool, which comprises: a first end portion; a second end portion; a connecting portion connecting the first end portion and the second end portion, wherein the first end portion and the second end portion are both cylindrical and have the same outer diameter, the outer periphery of the first end portion and the second end portion is respectively provided with a first spiral line structure and a second spiral line structure, and the first spiral line structure and the second spiral line structure are aligned.

[0005] In some embodiments, the outer diameter of the connecting portion is smaller than the outer diameter of the first end portion and the second end portion.

[0006] In some embodiments, the first end portion, the second end portion and the connecting portion are all cylindrical and have the same outer diameter.

[0007] In some embodiments, the outer periphery of the connecting portion is provided with a third spiral line structure, and the third spiral line structure is respectively connected with and aligned with the first spiral line structure and the second spiral line structure.

[0008] In some embodiments, the first spiral line structure is an external thread provided on the outer periphery of the first end portion, and the second spiral line structure is an external thread provided on the second end portion.

[0009] In some embodiments, the first spiral line structure is a groove provided on the outer periphery of the first end portion, and the second spiral line structure is a groove provided on the second end portion, and a ball is arranged in the groove.

[0010] In some embodiments, a first ball return channel is arranged on the first end portion, a second ball return channel is arranged on the second end portion, the first ball return channel and the groove on the outer periphery of the first end portion are in communication to form a first circulating raceway, and the second ball return channel and the groove on the outer periphery of the second end portion are in communication to form a second circulating raceway.

[0011] In some embodiments, the first ball return channel penetrates the first end portion in the axial direction, a pair of first circulators are arranged at both ends of the first end portion to communicate the first ball return channel with the groove on the outer periphery of the first end portion, the second ball return channel penetrates the second end portion in the axial direction, and a pair of first circulators are arranged at both ends of the second end portion to communicate the second ball return channel with the groove on the outer periphery of the second end portion.

[0012] In some embodiments, the first end portion and the second end portion comprise surface circulators that communicate two adjacent grooves on the outer periphery of the first end portion or two adjacent grooves on the outer periphery of the second end portion.

[0013] In some embodiments, a plurality of mounting holes are arranged on the outer periphery of the first end portion in the circumferential direction, a plurality of mounting holes are arranged on the outer periphery of the second end portion in the circumferential direction, the surface circulators comprise second circulators that are mounted in the mounting holes, and the second circulators are provided with second circulating grooves that penetrate the second circulators and communicate two adjacent grooves on the outer periphery of the first end portion or two adjacent grooves on the outer periphery of the second end portion.

[0014] In some embodiments, the second circulators are formed by two half circulators that are arranged in left-right central symmetry, the half circulators are provided with guide grooves that comprise concave segments and convex segments, the concave segment of the guide groove of one half circulator is complementary to the convex segment of the guide groove of the other half circulator, and the two half circulators form the second circulating groove.

[0015] In some embodiments, the surface circulators comprise third circulators that comprise a groove surface and a connecting surface, the groove surface is an arch surface, a plurality of third circulating grooves are arranged on the groove surface in the circumferential direction, the outer periphery of the first end portion and the outer periphery of the second end portion comprise mounting surfaces and threaded surfaces, the threaded surfaces are provided with grooves, the connecting surface is connected with the mounting surface, the groove surface is matched with the outer periphery of the threaded surface, and the third circulating grooves communicate two adjacent grooves on the threaded surface of the first end portion or two adjacent grooves on the threaded surface of the second end portion.

[0016] In some embodiments, retainers are arranged in the grooves to space adjacent balls apart.

[0017] In some embodiments, a plurality of positioning holes are arranged on the holder, and balls are arranged in the positioning holes, and the balls can rotate in the positioning holes without falling out.

[0018] In some embodiments, a stop mechanism is arranged at both ends of the channel of the first end portion, and a stop mechanism is arranged at both ends of the channel of the second end portion, for limiting the range of movement of the holder along the channel.

[0019] In some embodiments, a first connecting mechanism is arranged on the side of the first end portion opposite to the connecting portion, and / or a second connecting mechanism is arranged on the side of the second end portion opposite to the connecting portion, and the first connecting mechanism and / or the second connecting mechanism are used for connecting with a push rod.

[0020] The auxiliary installation tool provided by the embodiments of the present disclosure is used for positioning two nuts during the processing of the splice nut, and the inner threads of the two nuts are aligned due to the alignment of the first helical line structure at the first end and the second helical line structure at the second end of the auxiliary installation tool, so that the inner threads of the two nuts used for splicing are accurately butted, which is beneficial to realize the splice nut of any length, especially in the case of small size of the roller screw and the need for precision processing, which breaks through the limitation of the length-diameter ratio of the roller screw in the processing technology, and is beneficial to increase the stroke of the roller screw. BRIEF DESCRIPTION OF DRAWINGS

[0021] Figure 1 A schematic perspective view of an auxiliary installation tool for nut splicing according to some embodiments is shown.

[0022] Figure 2 A schematic perspective view of an auxiliary installation tool in the process of nut splicing according to some embodiments is shown.

[0023] Figure 3 A schematic cross-sectional view of an auxiliary installation tool in the process of nut splicing according to some embodiments and a partial enlarged view thereof are shown.

[0024] Figure 4 A schematic perspective view of a first circulator according to some embodiments is shown.

[0025] Figure 5 A partial schematic cross-sectional view of an auxiliary installation tool using a first circulator according to some embodiments is shown.

[0026] Figure 6 A partial schematic perspective view of an auxiliary installation tool using a surface circulator according to some embodiments is shown.

[0027] Figure 7 A schematic perspective view of a second circulator according to some embodiments is shown.

[0028] Figure 8 A schematic perspective view of a half circulator is shown according to some embodiments.

[0029] Figure 9 A schematic perspective view of a third circulator is shown according to some embodiments.

[0030] Figure 10 A partial schematic perspective view of an auxiliary installation tool using the third circulator is shown according to some embodiments.

[0031] Figure 11 A schematic perspective view of a retainer is shown according to some embodiments.

[0032] Figure 12 A schematic perspective view of a retainer disposed on a first end portion is shown according to some embodiments.

[0033] Figure 13 A schematic perspective view of an auxiliary installation tool for nut splicing is shown according to some embodiments.

[0034] Figure 14 A schematic perspective view of an electric cylinder is shown according to some embodiments.

[0035] Figure 15 A schematic cross-sectional view of an electric cylinder is shown according to some embodiments.

[0036] BRIEF DESCRIPTION OF DRAWINGS

[0037] 1, auxiliary installation tool; 11, first end portion; 111, first helical structure; 12, second end portion; 121, second helical structure; 13, connecting portion; 14, retainer; 15, ball; 16, positioning hole; 17, stop mechanism; 18, splicing groove; 2, first nut; 21, first internal thread; 3, second nut; 31, second internal thread; 4, first circulator; 401, first surface; 402, second surface; 403, third surface; 404, fourth surface; 411, first port; 412, second port; 42, first circulation channel; 43, main body portion; 44, positioning block; 5, second circulator; 51, second circulation channel; 53, half circulator; 531, guide groove; 6, third circulator; 61, third circulation channel; 700, electric cylinder. DETAILED DESCRIPTION

[0038] In order for those skilled in the art to better understand the technical solutions of the present disclosure, the technical solutions of the present disclosure are described in detail below with reference to the drawings.

[0039] Example embodiments will be described more fully hereinafter with reference to the accompanying drawings; this example embodiment may, however, be embodied in different forms, and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the disclosure to those skilled in the art.

[0040] The various embodiments as well as the various features of the embodiments are not to be construed as limiting, but are exemplary embodiments of how the embodiments can be implemented.

[0041] As used herein, the term "and / or" includes any and all combinations of one or more of the associated listed items.

[0042] The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the disclosure. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. It will be further understood that the terms "comprises" and / or "comprising", when used in this specification, specify the presence of stated features, integers, steps, operations, elements, and / or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and / or groups thereof.

[0043] The embodiments described herein can be described with reference to plan views and / or cross-sectional views by virtue of the fact that the disclosed embodiments can be idealized schematic illustrations. Consequently, the example illustrations can be modified in terms of manufacturing techniques and / or tolerances. Thus, the embodiments are not limited to the embodiments illustrated in the drawings, but include modifications of configurations formed based on manufacturing processes. Therefore, the regions illustrated in the drawings are of a schematic nature and the shapes of the regions shown in the drawings illustrate the specific shapes of the regions of the elements, but are not intended to be limiting.

[0044] Unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art. It will be further understood that terms, such as those defined in commonly used dictionaries, should be interpreted as having a meaning that is consistent with their meaning in the context of the relevant art and the present disclosure, and will not be interpreted in an overly literal or overly formal sense unless expressly so defined herein.

[0045] A planetary roller screw is a transmission unit that converts rotational motion into linear motion. The transmission unit is a roller between a screw and a nut. A planetary roller screw has 6-8 threaded roller small screws installed around a main threaded screw. The planetary roller screw converts the rotation of a motor into linear motion of a screw or a nut. The screw, the roller, and the nut are connected by thread engagement. The screw is, for example, a multi-threaded screw with a 90° thread angle. The roller is, for example, a single-threaded screw with the same thread angle. The nut is an internal thread with the same number of threads and thread type as the screw.

[0046] Linear transmission occupies an important position in industrial applications, and the field has been pursuing linear transmission systems with high length-diameter ratio and high load density. As a new generation of design with small radial size and high load density, the reverse planetary ball screw has great application prospects in intelligent manufacturing and artificial intelligence equipment. However, due to the limitations of existing processes, the nut of the small reverse planetary ball screw cannot be processed for long-stroke products, and cannot meet the demand of long-stroke applications in the market. For example, the process of precision machining determines that when the length-diameter ratio (nut length / nut diameter) is large, the machining difficulty is greater, and even cannot be processed, and cannot directly realize long nut.

[0047] Figure 1 is a schematic perspective view of an auxiliary installation tool for nut splicing according to some embodiments. Figure 2 is a schematic perspective view of an auxiliary installation tool according to some embodiments during the nut splicing process. Figure 3 is a schematic cross-sectional view of an auxiliary installation tool according to some embodiments during the nut splicing process.

[0048] The auxiliary installation tool of the present disclosure can be used for splicing nut machining of ball screws, splicing nut machining of roller screws, and splicing nut machining of other application scenarios. The present disclosure does not specially limit this.

[0049] In some embodiments, referring to Figures 1 to 3 The auxiliary installation tool 1 for nut splicing of the present disclosure includes a first end portion 11, a second end portion 12, and a connecting portion 13 connecting the first end portion 11 and the second end portion 12. In some embodiments, the connecting portion 13 is located between the first end portion 11 and the second end portion 12. In some embodiments, the first end portion 11, the second end portion 12, and the connecting portion 13 are integrally formed. In some embodiments, the auxiliary installation tool 1 can be formed of a metal material (for example, stainless steel) or other materials (for example, plastic, resin), etc.

[0050] In some embodiments, the first end portion 11 and the second end portion 12 are both cylindrical and have the same outer diameter. In some embodiments, the first end portion 11 and the second end portion 12 are respectively provided with a first helical line structure 111 and a second helical line structure 121 on the outer periphery thereof, and the first helical line structure 111 and the second helical line structure 121 are aligned. Therefore, the structures of the first end portion 11 and the second end portion 12 can be the same. In some embodiments, the alignment of the first helical line structure 111 and the second helical line structure 121 means that if the first helical line structure 111 and the second helical line structure 121 extend to the connecting portion 13, a continuous helical line structure can be formed, as if a single thread or a single raceway is formed on the outer periphery of the tool.

[0051] By aligning the first helical structure 111 and the second helical structure 121, the internal threads of the two nuts (e.g., nuts 2 and 3) positioned by the auxiliary installation tool 1 are also aligned, thereby ensuring that the internal threads of the two nuts used for splicing are precisely aligned.

[0052] In some embodiments, such as Figure 2 and Figure 3 As shown, during the nut splicing process, the first helical structure 111 is connected to the first nut 2, and the second helical structure 121 is connected to the second nut 3, so as to splice the first nut 2 and the second nut 3 together.

[0053] In some embodiments, such as Figure 3 As shown, the auxiliary installation tool 1 is dumbbell-shaped, with the first end 11 and the second end 12 forming a dumbbell-shaped double head. At this time, the connecting part 13 is recessed relative to the first end 11 and the second end 12, which facilitates the splicing operation between nuts.

[0054] In some embodiments, the auxiliary installation tool 1 is cylindrical in shape, with the first end 11, the second end 12, and the connecting portion 13 all being cylindrical with the same outer diameter; that is, the auxiliary installation tool 1 is cylindrical in its entirety. In some embodiments, a third helical structure (not shown) is provided on the outer circumference of the cylindrical portion 13, and the third helical structure is aligned with both the first helical structure 111 and the second helical structure 121. In some embodiments, the first helical structure 111, the second helical structure 121, and the third helical structure may be continuous or discontinuous. If continuous, the outer circumference of the auxiliary installation tool 1 may form a continuous helical structure (e.g., a single thread or a single raceway), in which case the thread or raceway penetrates the outer circumference of the cylinder.

[0055] In some embodiments, both the first helical structure 111 and the second helical structure 121 are external threads. The external threads of the first helical structure 111 and the second helical structure 121 can engage with the internal threads of the nut to be joined, for example, in a rotatable connection. In some embodiments, both the first helical structure 111 and the second helical structure 121 are raceways for balls. Thus, the first helical structure 111 and the second helical structure 121 can be connected to the nut via ball engagement, thereby reducing the contact area between the auxiliary installation tool 1 and the nut, and consequently reducing the frictional resistance between the auxiliary installation tool 1 and the nut. In some embodiments, the balls can be made of metal, for example, stainless steel.

[0056] In this embodiment of the present disclosure, a circulating raceway can be provided on the outer periphery of the first end 11 and the second end 12, and the ball can circulate in the circulating raceway on the outer periphery of the first end 11 or the second end 12, thereby not limiting the stroke.

[0057] In the embodiments of the present disclosure, the circulation track can be formed by the ball return channels, or can be formed on the surface of the outer periphery of the first end portion 11 and the second end portion 12, to realize the circulation rolling of the balls.

[0058] In some embodiments, the first end portion 11 is provided with a first ball return channel, and the second end portion 12 is provided with a second ball return channel. The first ball return channel and the groove of the outer periphery of the first end portion 11 are in communication with each other to form a first circulation track, and the balls circulate and roll in the first circulation track. The second ball return channel and the groove of the outer periphery of the second end portion 12 are in communication with each other to form a second circulation track, and the balls circulate and roll in the second circulation track.

[0059] Figure 5 Fig. 4 is a partial cross-sectional view of the first end portion 11 or the second end portion 12, Figure 5 Fig. 4 shows the structure of the ball return channel and the first circulation device 4. In some embodiments, referring to Fig. 4, Figure 5 As shown in Fig. 4, the first ball return channel penetrates the first end portion 11 in the axial direction, and a pair of first circulation devices 4 are arranged at both ends of the first end portion 11 to communicate the first ball return channel with the groove of the outer periphery of the first end portion 11. The second ball return channel penetrates the second end portion 12 in the axial direction, and a pair of first circulation devices 4 are arranged at both ends of the second end portion 12 to communicate the second ball return channel with the groove of the outer periphery of the second end portion 12.

[0060] In some embodiments, as shown in Fig. 5, Figure 4 As shown in Fig. 5, the first circulation device 4 includes a first surface 401, a second surface 402, and a third surface 403, and the first surface 401, the second surface 402, and the third surface 403 intersect with each other. The third surface 403 is provided with a first port 411, the second surface 402 is provided with a second port 412, and the first surface 411 is provided with a first circulation groove 42. The first circulation groove 42 penetrates the first circulation device 4 to communicate the first port 411 and the second port 412. The first port 411 is connected with the first ball return channel or the second ball return channel, and the second port 412 is connected with one end of the groove of the outer periphery of the first end portion 11 or the groove of the outer periphery of the second end portion 12, to form the first circulation track or the second circulation track.

[0061] In some embodiments, as shown in Fig. 6, Figure 4As shown in FIG. 1, the first circulator 4 includes a main body 43 and a positioning block 44, the main body 43 includes a first surface 401, a second surface 402, a third surface 403, and a fourth surface 404 parallel to the third surface 403, the positioning block 44 protrudes from the fourth surface 404, and the first circulation channel 42 penetrates through the main body 43 and the positioning block 44; the first return channel or the second return channel is provided with a positioning groove matching the shape of the positioning block 44 at both ends thereof, the first end portion 11 or the second end portion 12 is provided with a mounting groove matching the shape of the main body 43 at both ends thereof, and the positioning groove is arranged in the mounting groove; the main body 43 cooperates with the mounting groove, and the positioning block 44 cooperates with the positioning groove, so that the first circulator 4 is mounted on the first end portion 11 or the second end portion 12.

[0062] In some embodiments, the first end portion 11 and the second end portion 12 include a surface circulator, and the surface circulator connects two adjacent channels on the outer periphery of the first end portion 11 or the second end portion 12.

[0063] Figure 6 FIG. 1 is a schematic view of the first end portion 11 or the second end portion 12. In some embodiments, as shown in FIG. 1, Figure 6 , Figure 7 the first end portion 11 is provided with a plurality of mounting holes distributed in the circumferential direction on the outer periphery thereof, and the second end portion 12 is provided with a plurality of mounting holes distributed in the circumferential direction on the outer periphery thereof; the surface circulator includes a second circulator 5, and the second circulator 5 is mounted in the mounting hole; the second circulator 5 is provided with a second circulation channel 51 penetrating through the second circulator 5, and the second circulation channel 51 connects two adjacent channels on the outer periphery of the first end portion 11 or the second end portion 12.

[0064] In some embodiments, as shown in FIG. 1, Figure 8 the second circulator 5 is composed of two half circulators 53, and the two half circulators 53 are arranged in a left-right central symmetry; the half circulator 53 is provided with a guide groove 531, the guide groove 531 includes a concave section protruding inward and a convex section protruding outward; the concave section of the guide groove 531 of one half circulator 53 is complementary to the convex section of the guide groove 531 of the other half circulator 53, thereby forming the second circulation channel 51.

[0065] Figure 10 FIG. 1 is a schematic view of the first end portion 11 or the second end portion 12. In some embodiments, as shown in FIG. 1, Figure 9 , Figure 10As shown, the surface circulator comprises a third circulator 6, the third circulator 6 comprises a groove surface and a connecting surface, the groove surface is an arch surface, and a plurality of third circulation grooves 61 extending in the circumferential direction are arranged on the groove surface; the outer periphery of the first end portion 11 and the outer periphery of the second end portion 12 comprise a mounting surface and a threaded surface, and a groove is arranged on the threaded surface; the connecting surface is connected with the mounting surface in a matched manner, the groove surface is matched with the outer periphery of the threaded surface, and the third circulation grooves 61 connect two adjacent grooves on the threaded surface of the first end portion 11 or two adjacent grooves on the threaded surface of the second end portion 12.

[0066] In some embodiments, as shown in Figure 11 and Figure 12 When the first helical line structure 111 and the second helical line structure 121 are both ball tracks, retainers 14 for the balls 15 are arranged in the ball tracks to space the adjacent balls 15 apart. In this way, the mutual friction between the balls 15 can be avoided, and the resistance can be reduced. In some embodiments, the retainers 14 are helical in shape.

[0067] In some embodiments, as shown in Figure 11 and Figure 12 The retainers 14 are provided with positioning holes 16 and allow the balls 15 to rotate in the positioning holes 16 without falling out. In some embodiments, the positioning holes 16 of the retainers 14 are provided with limiting structures matched with the shape of the balls 15, so that the balls 15 cannot fall out of the positioning holes 16.

[0068] In some embodiments, the retainers 14 can be made of elastic or rigid materials.

[0069] In some embodiments, the retainers 14 can be flexible injection-molded elastomers made by plastic injection molding, for example, flat injection molding. In some embodiments, as shown in Figure 5 The retainers 14 are helically wound on the first end portion 11. After the balls 15 are installed in the ball tracks of the tool by the retainers 14, when the tool rotates relative to the nut, the balls 15 can rotate in the positioning holes 16 of the retainers 14, thereby rolling in the ball tracks, and the retainers 14 move along the ball tracks together. It should be understood that although Figure 12 only the retainers 14 installed on the first end portion 11 are shown, the same retainers 14 can be installed on the second end portion 12.

[0070] In some embodiments, as shown in Figure 12As shown, the axial end side of the first end portion 11 opposite to the connecting portion 13 and the axial end side of the second end portion 12 opposite to the connecting portion 13 are provided with a stop mechanism 17 for preventing further movement of the retainer 14. Thus, the stop mechanism 17 can be provided at both ends of the auxiliary installation tool 1 for limiting the stroke of the retainer 14, thereby limiting the stroke of the auxiliary installation tool. For example, when the retainer 14 moves to the position of the stop mechanism 17, the retainer 14 stops, and the auxiliary installation tool 1 also stops, thereby playing a role in limiting the stroke, and also preventing the rolling ball 15 from falling out of the raceway. Of course, since the auxiliary installation tool 1 will eventually be withdrawn, even if the rolling ball falls off, it does not affect, and therefore, the stop mechanism 17 is not necessary.

[0071] In some embodiments, the axial end side of the first end portion 11 opposite to the connecting portion 13 is provided with a first connecting mechanism. In some embodiments, as shown, Figure 13 As shown, the axial end side of the second end portion 12 opposite to the connecting portion 13 is provided with a second connecting mechanism 19. The first connecting mechanism and the second connecting mechanism are used for connecting with a push rod. Thus, the connecting mechanism can be provided at one end or both ends of the auxiliary installation tool 1, and when the auxiliary installation tool 1 is installed after the first nut 2 and the second nut 3 is installed on the auxiliary installation tool 1, it is convenient to fix the auxiliary installation tool 1 with a push rod, prevent the auxiliary installation tool 1 from rotating so that the second nut 3 cannot be installed; after the two nuts are welded and assembled together, it is convenient to rotate the auxiliary installation tool 1 with a push rod, thereby withdrawing or removing the auxiliary installation tool 1 from the spliced nut.

[0072] The auxiliary installation tool of the embodiments of the present disclosure can splice short nuts into long nuts, and can realize accurate alignment of the internal threads of the spliced nuts.

[0073] In some embodiments, the inner diameter of the spliced nut is 1 mm to 10 mm. In some embodiments, the inner diameter of the spliced nut is less than 6 mm. In some embodiments, the inner diameter of the spliced nut is 1 mm to 6 mm, for example, 1 mm, 2 mm, 3 mm, 4 mm, 5 mm or 6 mm or any suitable value therebetween. It should be understood that the smaller the inner diameter of the nut, the more difficult it is to process the internal thread.

[0074] In some embodiments, the length-diameter ratio of the spliced nut is 1 to 100. In some embodiments, the length-diameter ratio of the spliced nut is 20, 30, 40, 50, 60, 70, 80, 90, 100, etc. or any suitable value therebetween. It should be understood that the greater the length-diameter ratio of the nut, the more difficult it is to process the internal thread. At present, it is not yet possible to process accurate internal threads for nuts with a large length-diameter ratio in the process. The present disclosure overcomes this technical problem by splicing using a tool, thereby achieving a nut with a large length-diameter ratio (in fact, a long spliced nut of any length can be obtained) while achieving accurate butt joint of the threads of the nut.

[0075] Another embodiment of the present disclosure provides a nut, which is a spliced nut processed using the above-mentioned auxiliary installation tool.

[0076] As shown in Figure 14 and Figure 15 Another embodiment of the present disclosure provides an electric cylinder 700 comprising the above-mentioned nut or spliced nut. In some embodiments, the electric cylinder 700 is a long-stroke integrated electric cylinder. The long spliced nut manufactured using the above-mentioned auxiliary installation tool enables a larger stroke, and by adding multiple motors (for example, one motor for each pair of short nuts for splicing, and the longer the nut, the more motors that can be added), a larger processing and higher power electric cylinder system is achieved. Based on the process of processing a long spliced nut, the present disclosure can integrate as many frameless motors as possible by utilizing the long motor chamber size provided by the long spliced nut, so as to double the output power. Since the screw life is directly related to the rated load, and the rated load is directly related to the nut length and motor power. By adopting a long spliced nut, the present disclosure allows more frameless motors to be integrated, so that the stroke, power, and life of the electric cylinder are all improved by several times.

[0077] In the working process of the electric cylinder, the motor drives the screw to rotate, thereby enabling the nut to complete linear motion. The working principle of the planetary roller screw is that the screw can be regarded as a sun gear, the roller can be regarded as a planet gear, and the nut can be regarded as a center gear. When the screw rotates and the circumference of the nut is fixed, the roller moves in the circumferential direction like a planet, and at the same time, the rotation of the screw (or the nut) is converted into the linear reciprocating motion of the nut (or the screw) through helical transmission. The working principle of the planetary roller screw is similar to that of the roller screw, i.e. the servo motor drives the screw to rotate, thereby enabling the planetary roller nut assembly to drive the electric cylinder push rod to complete linear reciprocating push-pull motion.

[0078] According to the structural composition and the motion relationship, the planetary roller screw can be divided into five types: standard planetary roller screw, reverse planetary roller screw, circulating planetary roller screw, differential planetary roller screw and bearing ring planetary roller screw. The reverse planetary roller screw has high integration and miniaturization, and the nut is used as a force transmission component and a rotor of the motor. The planetary roller screw transmission is an important actuator of electromechanical devices. Common electromechanical actuators can be divided into integrated electromechanical actuators (I-EMA) and integrated electromechanical actuators (C-EMA). The structure of a typical integrated electromechanical actuator is composed of a brushless DC motor, a controller (including a speed, position, torque controller and a power converter), a reducer (gear transmission or belt transmission) and a planetary roller screw. The structure of an integrated electromechanical actuator is mainly composed of a planetary roller screw (including a screw, a roller and a nut), a motor (magnet and coil winding) and a controller (control, measurement, feedback unit and corresponding interface). For the reverse planetary roller screw, the nut is used as a force transmission component and a rotor of the motor, and the linear servo is realized through the meshing transmission of the screw, the roller and the nut, which is a truly integrated electromechanical actuator.

[0079] Example embodiments have been disclosed herein and, although the use of specific terms is expressly used herein, they are intended in the sense only of generically describing and only the general meaning shall be understood and are not for limiting purposes. In some instances, it will be apparent to those skilled in the art that features, characteristics and / or elements described in connection with a particular embodiment can be used alone or in combination with other embodiments, unless explicitly stated otherwise. Therefore, those skilled in the art will appreciate that various changes can be made in form and detail without departing from the scope of the present disclosure as set forth in the appended claims.

Claims

1. An installation aid tool, characterized in that, The auxiliary installation tool (1) comprises: a first end portion (11); a second end portion (12); a connecting portion (13) connecting the first end portion (11) and the second end portion (12), wherein the first end portion (11) and the second end portion (12) are both cylindrical and have the same outer diameter, the outer periphery of the first end portion (11) is provided with a first helical structure (111), and the outer periphery of the second end portion (12) is provided with a second helical structure (121), and the first helical structure (111) and the second helical structure (121) are aligned.

2. The supplemental installation tool of claim 1, wherein, The outer diameter of the connecting portion (13) is smaller than the outer diameter of the first end portion (11) and the second end portion (12).

3. The supplemental installation tool of claim 1, wherein, The first end portion (11), the second end portion (12), and the connecting portion (13) are all cylindrical and have the same outer diameter.

4. The supplemental installation tool of claim 3, wherein, The outer periphery of the connecting portion (13) is provided with a third helical structure, which is connected to and aligned with the first helical structure (111) and the second helical structure (121) respectively.

5. The installation aid of any one of claims 1 to 4, wherein, The first helical structure (111) is an external thread provided on the outer periphery of the first end portion (11), and the second helical structure (121) is an external thread provided on the second end portion (12).

6. The installation aid of any one of claims 1 to 4, wherein, The first helical structure (111) is a groove provided on the outer periphery of the first end portion (11), and the second helical structure (121) is a groove provided on the second end portion (12), and a ball is arranged in the groove.

7. The supplemental installation tool of claim 6, wherein, A first ball return channel is arranged on the first end portion (11), and a second ball return channel is arranged on the second end portion (12), the first ball return channel and the groove on the outer periphery of the first end portion (11) are in communication to form a first circulating track, and the second ball return channel and the groove on the outer periphery of the second end portion (12) are in communication to form a second circulating track.

8. The supplemental installation tool of claim 7, wherein, The first ball return channel penetrates the first end portion (11) in the axial direction, and a pair of first circulators (4) are arranged at both ends of the first end portion (11) to connect the first ball return channel and the groove on the outer periphery of the first end portion (11). The second ball return channel penetrates the second end portion (12) in the axial direction, and a pair of first circulators (4) are arranged at both ends of the second end portion (12) to connect the second ball return channel and the groove on the outer periphery of the second end portion (12).

9. The supplemental installation tool of claim 6, wherein, The first end portion (11) and the second end portion (12) comprise a surface circulator which connects two adjacent grooves on the outer periphery of the first end portion (11) or the second end portion (12).

10. The supplemental installation tool of claim 9, wherein, A plurality of mounting holes are arranged on the outer periphery of the first end portion (11) and the second end portion (12) in the circumferential direction, and the surface circulator comprises a second circulator (5) which is mounted in the mounting hole. The second circulator (5) is provided with a second circulation channel (51) penetrating through the second circulator (5), and the second circulation channel (51) connects two adjacent channels on the outer periphery of the first end (11) or two adjacent channels on the outer periphery of the second end (12).

11. The supplemental installation tool of claim 10, wherein, The second circulator (5) is composed of two half circulators (53) which are arranged in a left-right central symmetry; the half circulator (53) is provided with a guide groove (531), and the guide groove (531) includes a concave section and a convex section; the concave section of the guide groove (531) of one half circulator (53) is complementary to the convex section of the guide groove (531) of the other half circulator (53), thereby forming the second circulation channel (51).

12. The supplemental installation tool of claim 9, wherein, The surface circulator includes a third circulator (6), and the third circulator (6) includes a groove surface and a connecting surface; the groove surface is an arch surface, and a plurality of third circulation channels (61) extending in the circumferential direction are formed in the groove surface. The outer periphery of the first end (11) and the outer periphery of the second end (12) include a mounting surface and a threaded surface, and the threaded surface is provided with channels; the connecting surface is connected with the mounting surface, the groove surface is matched with the outer periphery of the threaded surface, and the third circulation channels (61) connect two adjacent channels on the threaded surface of the first end (11) or two adjacent channels on the threaded surface of the second end (12).

13. The supplemental installation tool of claim 6, wherein, A retainer (14) is arranged in the channel to space the adjacent balls.

14. The supplemental installation tool of claim 13, wherein, The retainer (14) is provided with a plurality of positioning holes, and the balls are arranged in the positioning holes; the balls can rotate in the positioning holes without falling out.

15. The supplemental installation tool of claim 14, wherein, The channels of the first end (11) are provided with stop mechanisms at both ends, and the channels of the second end (12) are provided with stop mechanisms at both ends, thereby limiting the range of movement of the retainer (14) along the channels.

16. The installation aid of any one of claims 1 to 4, wherein, A first connecting mechanism is arranged on the side opposite to the connecting portion (13) of the first end (11), and / or a second connecting mechanism is arranged on the side opposite to the connecting portion (13) of the second end (12); the first connecting mechanism and / or the second connecting mechanism are used for connecting with a push rod.

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