Pitch changing mechanism

Abstract

The invention discloses a pitch changing mechanism, and relates to the technical field of keyboard production, the pitch changing mechanism comprises a bottom plate, and a first fixing plate and a second fixing plate are fixed on the plate surface of the bottom plate; a plurality of pairs of positioning rods are fixed between the first fixing plate and the second fixing plate; the outer sides of each pair of positioning rods are jointly sleeved with a first moving plate in a sliding manner; a moving assembly enabling the first moving plate to move is arranged on the bottom plate. A plurality of carriers are arranged on the outer sides of each pair of positioning rods in a sliding and sleeving manner; an H-shaped groove is formed in the bottom of the carrier, and the groove width of one end of the H-shaped groove is smaller than that of the other end of the H-shaped groove; a large-width groove of the H-shaped groove is set as a head groove, and a small-width groove of the H-shaped groove is set as a tail groove. The keyboard production line is applied to keyboard production, each carrying head used for placing the keycaps can slide, the carrying heads on the same transverse row are separated in a traction mode, and therefore the distance between every two adjacent carrying heads can be expanded, and the keyboard production line is suitable for keyboard production of another specification.

Description

Technical Field

[0001] The present invention relates to the technical field of keyboard production, and more particularly to a variable pitch mechanism. Background Art

[0002] A keyboard is an instruction and data input device used to operate a computer device, and is also a part of a keyboard instrument. It can also refer to an instrument using a keyboard, such as a piano, a digital piano, or an electronic organ.

[0003] After retrieval, a patent document with the authorization announcement number CN217933561U discloses a keyboard keycap pressing and installing jig, which relates to the field of keyboard production. The keyboard keycap pressing and installing jig includes an installing jig. One side of the installing jig is provided with a T-shaped limiting plate. One end of the T-shaped limiting plate penetrates through the installing jig and contacts the installing jig. A plurality of keycap placement grooves are opened on both the T-shaped limiting plate and one side of the installing jig. In this keyboard keycap pressing and installing jig, the keycap placement grooves opened on the T-shaped limiting plate are offset by a little from those opened on the installing jig, so as to limit and fix the keycaps placed in the plurality of keycap placement grooves. By using the T-shaped limiting plate to limit and fix the keycaps in the keycap placement grooves, a plurality of keycaps can be quickly pressed and installed on the keyboard at one time, reducing the pressure on the keyboard during the keycap installation process. With the cooperation of the installing jig and the T-shaped limiting plate, the safety of the keyboard when installing keycaps is ensured, and economic losses are reduced.

[0004] Based on the retrieval and the prior art, it is found that: in the processing process of the keycaps on the keyboard, a jig (such as the jig retrieved above) is required. However, for the production of another type of keyboard, another jig needs to be selected to meet the keycap spacing on the keyboard. Summary of the Invention

[0005] The purpose of the present invention is to provide a variable pitch mechanism to solve the problems raised in the above background art.

[0006] The technical solution of the present invention is: a variable pitch mechanism, including a bottom plate;

[0007] A first fixing plate and a second fixing plate are fixed on the plate surface of the bottom plate;

[0008] A plurality of pairs of positioning rods are fixed between the first fixing plate and the second fixing plate;

[0009] A first moving plate is slidably sleeved on the outer sides of each pair of the positioning rods;

[0010] A moving component for moving the first moving plate is arranged on the bottom plate;

[0011] A plurality of carriers are slidably sleeved on the outer sides of each pair of the positioning rods;

[0012] The bottom of the carrier is provided with an H-shaped groove, and the groove width at one end of the H-shaped groove is smaller than that at the other end;

[0013] Set the large-width groove of the H-shaped groove as the head groove, and set the small-width groove of the H-shaped groove as the tail groove. The H-shaped grooves of multiple carriers on each pair of the positioning rods are aligned end to end;

[0014] The head groove of each carrier and the tail groove of the adjacent carrier jointly and slidably embed a traction bar with an H-shaped contour, and the widths of both ends of the traction bar are the same and are the same as the width of the small-width groove of the H-shaped groove;

[0015] Each of the traction bars is in contact with the bottom plate;

[0016] One end of the traction bar adjacent to the first fixed plate is slidably embedded on the first fixed plate, and one end of the traction bar adjacent to the first moving plate is slidably embedded on the first moving plate.

[0017] Preferably, the moving assembly includes a cylinder, a second moving plate and two pull rods. The cylinder is fixed to the bottom plate, the telescopic end of the cylinder is fixed to the second moving plate, and both ends of the two pull rods are respectively fixed to the first moving plate and the second moving plate.

[0018] Preferably, two positioning sleeves are fixed on the plate surface of the bottom plate, and the two pull rods are respectively slidably inserted on the two positioning sleeves.

[0019] Preferably, a rectangular opening is provided on the plate surface of the bottom plate, a frame plate aligned with the bottom plate is arranged outside the bottom plate, and an adjusting assembly for enabling the frame plate to linearly move relative to the bottom plate is arranged outside the bottom plate.

[0020] Preferably, the adjusting assembly includes a guiding structure. The guiding structure includes a plurality of positioning columns. One end of the positioning column is fixed to the bottom plate, and the frame plate is slidably sleeved on each positioning column.

[0021] Preferably, the adjusting assembly further includes a first fixed ear, a second fixed ear, a threaded column and an internal threaded sleeve. The first fixed ear is fixed to the frame plate, the second fixed ear is fixed to the bottom plate, a rotation hole is provided on the outer side of the first fixed ear, the internal threaded sleeve is rotatably installed in the rotation hole, the outer side of the threaded column is threadedly installed in the internal threaded sleeve, one end of the threaded column is fixed to the second fixed ear, and a rotation mechanism for rotating the internal threaded sleeve is arranged on the outer side of the first fixed ear.

[0022] Preferably, the rotation mechanism includes a servo motor, a first bevel gear and a second bevel gear. The servo motor is fixed to the first fixed ear, the output shaft of the servo motor is coaxially fixed to the second bevel gear, the first bevel gear is coaxially fixed to the internal threaded sleeve, and the first bevel gear meshes with the second bevel gear.

[0023] Preferably, a laser rangefinder is embedded and fixed in the first fixing ear, and the measuring end of the laser rangefinder faces the second fixing ear.

[0024] Preferably, a plurality of cylindrical rods are fixedly connected to both ends inside the frame opening of the frame plate, and a plurality of sliding sleeves are slidably sleeved on the outer sides of the cylindrical rods; the traction strip is divided into a first T-shaped body and a second T-shaped body, the first T-shaped body is located in the head groove of the H-shaped groove, the second T-shaped body is located in the tail groove of the H-shaped groove, a notch is formed at the non-T head end of the second T-shaped body, the non-T head end of the first T-shaped body is slidably inserted into the notch, a moving strip is fixed to the outer side of the first T-shaped body, a sliding strip is fixed to the outer side of the second T-shaped body, a hollow shell fixed to the sliding sleeve is slidably sleeved on the moving strip and the sliding strip together, an inclined groove is formed in the outer side of the hollow shell, a rectangular guiding block is fixed to the outer side of the moving strip, the guiding block is slidably arranged in the inclined groove, a top plate is arranged inside the hollow shell, the moving strip and the sliding strip are both in contact with the top plate, columns are fixed to the opposite sides of the hollow shell and the top plate, and a spring is sleeved on the outer sides of the two columns together.

[0025] The present invention provides a variable distance mechanism through improvement. Compared with the prior art, the following improvements and advantages are achieved:

[0026] First: The present invention is applied to keyboard production, and each carrier head for placing keycaps can slide. The carrier heads in the same horizontal row are separated by traction. It can be seen that the distance between every two adjacent carrier heads can be expanded, so as to adapt to the production of another specification of keyboard.

[0027] Second: The length of the traction strip for the carrier head of the present invention can be adjusted. Since each traction strip is adjusted by the same adjusting mechanism, and every two adjacent carrier heads are pulled and separated by the traction strip therebetween, the distance between every two adjacent carrier heads is determined by the length of the traction strip. Since the length of the traction strip can be adjusted, the distance between every two adjacent carrier heads can be changed, so as to adapt to the production of various keyboards.

[0028] Third, the present invention is improved based on the existing traction variable distance mechanism, and at the same time, the length of the traction strip for the carrier head can be adjusted, so that the flexibility characteristic of the traction variable distance mechanism can be retained, and the variable distance process can be carried out quickly. Description of the Drawings

[0029] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the following will briefly introduce the drawings required for the description of the specific embodiments or the prior art. Obviously, the drawings in the following description are some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0030] Figure 1 Schematic diagram of the overall three-dimensional structure of the present invention from the first perspective;

[0031] Figure 2 Schematic diagram of the overall three-dimensional structure of the present invention from the second perspective;

[0032] Figure 3 Schematic diagram of the three-dimensional structure of the present invention in the state without a bottom plate;

[0033] Figure 4 For Figure 3 Enlarged structure schematic diagram of part A;

[0034] Figure 5 Schematic diagram of the three-dimensional structure of the present invention in the state without a carrier;

[0035] Figure 6 For Figure 5 Schematic diagram of the sectional view;

[0036] Figure 7 Schematic diagram of the frame plate installation structure of the present invention (this drawing only shows a single carrier);

[0037] Figure 8 For Figure 7 Enlarged structure schematic diagram of part B;

[0038] Figure 9 Schematic diagram of the three-dimensional structure of the adjustment component of the present invention;

[0039] Figure 10 Top view structure schematic diagram of the adjustment component of the present invention;

[0040] Figure 11 Schematic diagram of the installation structure of the first T body and the second T body of the present invention;

[0041] Figure 12 Schematic diagram of the installation structure of the hollow shell of the present invention;

[0042] Figure 13 Schematic diagram of the internal structure of the hollow shell of the present invention;

[0043] Figure 14 Schematic diagram of the three-dimensional structures of both the first T body and the second T body of the present invention;

[0044] Figure 15 Front view structural schematic diagrams of the first T body and the second T body of the present invention.

[0045] Reference numerals:

[0046] 1. Base plate; 2. Carrier; 3. First fixing plate; 4. First moving plate; 5. Second fixing plate; 6. Second moving plate; 7. Cylinder; 8. Positioning sleeve; 9. Pull rod; 10. H-shaped groove; 11. Traction strip; 12. Positioning rod; 13. Frame plate; 14. Cylindrical rod; 15. Positioning column; 16. Sliding sleeve; 17. First fixing ear; 18. Laser rangefinder; 19. Second fixing ear; 20. Internal thread sleeve; 21. First bevel gear; 22. Second bevel gear; 23. Servo motor; 24. Hollow shell; 25. First T body; 26. Second T body; 27. Moving strip; 28. Sliding strip; 29. Spring; 30. Guide block; 31. Top plate; 32. Cylindrical body; 33. Inclined groove. Detailed implementation manners

[0047] The present invention will be described in detail below. The technical solutions in the embodiments of the present invention are clearly and completely described. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0048] The present invention provides a variable pitch mechanism through improvement. The technical solution of the present invention is as follows:

[0049] Embodiment 1

[0050] As Figures 1 to 6 shown, the embodiment of the present invention provides a variable pitch mechanism, including a base plate 1;

[0051] A first fixing plate 3 and a second fixing plate 5 are fixed on the plate surface of the base plate 1;

[0052] A plurality of pairs of positioning rods 12 are fixed between the first fixing plate 3 and the second fixing plate 5;

[0053] A first moving plate 4 is slidably sleeved on the outside of each pair of positioning rods 12. The positioning rods 12 are provided to enable the first moving plate 4 to only move linearly;

[0054] A moving assembly for moving the first moving plate 4 is provided on the base plate 1;

[0055] A plurality of carriers 2 are slidably sleeved on the outside of each pair of positioning rods 12. Here, a supplementary description is made for the carrier 2. A mold adapted to the keyboard keycap is fixed at one end of the carrier 2. The mold is provided with a round hole, and an adsorption hole is opened on the carrier 2. The adsorption hole can be connected to a vacuum pump for adsorbing the keycap;

[0056] The bottom of the carrier 2 is provided with an H-shaped groove 10, and the width of one end of the H-shaped groove 10 is smaller than that of the other end.

[0057] The large-width groove of the H-shaped groove 10 is set as the head groove, and the small-width groove of the H-shaped groove 10 is set as the tail groove. The H-shaped grooves 10 of multiple carriers 2 on each pair of positioning rods 12 are aligned end to end.

[0058] The head groove of each carrier 2 and the tail groove of the adjacent carrier 2 jointly and slidably embed a traction strip 11 with an H-shaped contour, and the widths of both ends of the traction strip 11 are the same and are the same as the width of the small-width groove of the H-shaped groove 10. When one carrier 2 is pulled, when the head groove of the carrier 2 contacts the traction strip 11, the traction strip 11 pulls the adjacent carrier 2, and at the same time, the two carriers 2 are separated from each other with a gap left.

[0059] Each traction strip 11 contacts the bottom plate 1, so that the traction strip 11 will not slide out of the H-shaped groove 10.

[0060] One end of the traction strip 11 adjacent to the first fixed plate 3 is slidably embedded on the first fixed plate 3, and one end of the traction strip 11 adjacent to the first moving plate 4 is slidably embedded on the first moving plate 4. This installation method refers to Figure 3 and Figure 4 ;

[0061] From the above connection relationship, it can be seen that when the first moving plate 4 moves, the traction strip 11 on the first moving plate 4 pulls the adjacent carriers 2. When the head groove of the carrier 2 contacts the traction strip 11 of the adjacent carrier 2, the traction strip 11 pulls the adjacent carrier 2, and at the same time, the two carriers 2 are separated, and so on until all the carriers 2 are separated.

[0062] Specifically, as shown in the attached Figure 1 - attached Figure 3 shown, the moving assembly includes a cylinder 7, a second moving plate 6 and two pull rods 9. The cylinder 7 is fixed to the bottom plate 1, the telescopic end of the cylinder 7 is fixed to the second moving plate 6, and both ends of the two pull rods 9 are fixed to the first moving plate 4 and the second moving plate 6 respectively. The telescopic end of the cylinder 7 pushes the second moving plate 6 outwards, and the second moving plate 6 pulls the first moving plate 4 through the pull rods 9.

[0063] Specifically, as shown in the attached Figure 1 shown, two positioning sleeves 8 are fixed on the plate surface of the bottom plate 1, and the two pull rods 9 are respectively slidably inserted into the two positioning sleeves 8. The setting of the positioning sleeves 8 is to improve the stability of the pull rods 9.

[0064] Working principle: The telescopic end of the cylinder 7 pushes the second moving plate 6 outwards, and the second moving plate 6 pulls the first moving plate 4 through the pull rod 9; when the first moving plate 4 moves, the traction strip 11 on the first moving plate 4 pulls each adjacent carrier 2. When the head groove of the carrier 2 comes into contact with the traction strip 11 of the adjacent carrier 2, the traction strip 11 pulls the adjacent carrier 2, and at the same time, the two carriers 2 are separated. And so on, until all the carriers 2 are separated, thus completing the pitch change.

[0065] Embodiment Two

[0066] Combined with the attached Figures 7 - 15 As shown, based on a pitch-changing mechanism provided by the first embodiment of the present application, another pitch-changing mechanism is proposed in the second embodiment of the present application. The second embodiment is merely a further form of the first embodiment, and the implementation of the second embodiment will not affect the independent implementation of the first embodiment: A rectangular opening is provided on the plate surface of the bottom plate 1, a frame plate 13 aligned with the bottom plate 1 is arranged outside the bottom plate 1, and an adjusting component for enabling the frame plate 13 to linearly move relative to the bottom plate 1 is arranged outside the bottom plate 1.

[0067] Specifically, combined with the attached Figure 7 As shown, the adjusting component includes a guiding structure. The guiding structure includes a plurality of positioning columns 15. One end of the positioning column 15 is fixed on the bottom plate 1, and the frame plate 13 is slidably sleeved on each positioning column 15. The positioning columns 15 are provided to enable the frame plate 13 to only linearly move relative to the bottom plate 1.

[0068] More specifically, combined with the attached Figure 7 , the attached Figure 9 and the attached Figure 10 As shown, the adjusting component further includes a first fixing ear 17, a second fixing ear 19, a threaded column and an internal thread sleeve 20. The first fixing ear 17 is fixed to the frame plate 13, the second fixing ear 19 is fixed to the bottom plate 1. A rotation hole is provided on the outer side of the first fixing ear 17, the internal thread sleeve 20 is rotatably installed in the rotation hole, the outer side of the threaded column is installed in the internal thread sleeve 20 through threads, one end of the threaded column is fixed to the second fixing ear 19, and a rotation mechanism for rotating the internal thread sleeve 20 is arranged on the outer side of the first fixing ear 17; when the internal thread sleeve 20 rotates, the internal thread sleeve 20 moves along the threaded rod in a form of screw drive. Since one end of the threaded column is fixed to the second fixing ear 19 and the internal thread sleeve 20 is rotatably installed on the first fixing ear 17, and since the first fixing ear 17 and the second fixing ear 19 are respectively fixed on the frame plate 13 and the bottom plate 1, the distance between the frame plate 13 and the bottom plate 1 is thus adjusted.

[0069] Specifically, combined with the attached Figure 9 and the attached Figure 10As shown, the rotating mechanism includes a servo motor 23, a first bevel gear 21, and a second bevel gear 22. The servo motor 23 is fixed to the first fixed ear 17. The output shaft of the servo motor 23 is coaxially fixed to the second bevel gear 22. The first bevel gear 21 is coaxially fixed to the internal thread sleeve 20. The first bevel gear 21 meshes with the second bevel gear 22. The servo motor 23 rotates the second bevel gear 22 through the output shaft, and the second bevel gear 22 drives the internal thread sleeve 20 to rotate through the first bevel gear 21 engaged therewith.

[0070] Specifically, as shown in the attached Figure 10 As shown, a laser rangefinder 18 is embedded and fixed in the first fixed ear 17. The measuring end of the laser rangefinder 18 faces the second fixed ear 19. The laser rangefinder 18 is a prior art, and its specific structure and working principle will not be elaborated in detail here. The laser rangefinder 18 is used to measure the distance between the first fixed ear 17 and the second fixed ear 19.

[0071] Specifically, as shown in the attached Figure 8 and Figures 11 - 15 As shown, a plurality of cylindrical rods 14 are commonly fixed at both ends inside the frame opening of the frame plate 13. A plurality of sliding sleeves 16 are slidably sleeved on the outer sides of the cylindrical rods 14. The traction strip 11 is divided into a first T-shaped body 25 and a second T-shaped body 26. The first T-shaped body 25 is located in the head groove of the H-shaped groove 10, and the second T-shaped body 26 is located in the tail groove of the H-shaped groove 10. A notch is formed at the non-T head end of the second T-shaped body 26. The non-T head end of the first T-shaped body 25 is slidably inserted into the notch. A moving strip 27 is fixed to the outer side of the first T-shaped body 25, and a sliding strip 28 is fixed to the outer side of the second T-shaped body 26. A hollow shell 24 fixed to the sliding sleeve 16 is commonly slidably sleeved on the moving strip 27 and the sliding strip 28. An inclined groove 33 is formed on the outer side of the hollow shell 24. A rectangular guide block 30 is fixed to the outer side of the moving strip 27. The guide block 30 is slidably arranged in the inclined groove 33. A top plate 31 is arranged inside the hollow shell 24. Both the moving strip 27 and the sliding strip 28 are in contact with the top plate 31. Columns 32 are fixed to the opposite sides of the hollow shell 24 and the top plate 31. A spring 29 is commonly sleeved on the outer sides of the two columns 32. If the frame plate 13 approaches the bottom plate 1, that is, the sliding sleeve 16 on the frame plate 13 approaches the carrier 2, and the hollow shell 24 on the sliding sleeve 16 approaches the first T-shaped body 25 and the second T-shaped body 26, the top inside the hollow shell 24 is pushed in. At this time, the spring 29 is compressed, so that the first T-shaped body 25 and the second T-shaped body 26 can be stably located in the H-shaped groove 10. At the same time, the guide block 30 on the moving strip 27 on the first T-shaped body 25 slides along the inclined groove 33. Since the hollow shell 24 approaches the first T-shaped body 25, the guide block 30 slides downward along the inclined groove 33, that is, the moving plate approaches the sliding strip 28 of the second T-shaped body 26. At this time, the non-T head end of the first T-shaped body 25 moves into the notch of the second T-shaped body 26, and the overall length of the traction strip 11 composed of the first T-shaped body 25 and the second T-shaped body 26 is shortened.

[0072] Working principle:

[0073] The servo motor 23 rotates the second bevel gear 22 through the output shaft, and the second bevel gear 22 drives the internal thread sleeve 20 to rotate through the first bevel gear 21 meshing with it;

[0074] When the internal thread sleeve 20 rotates, the internal thread sleeve 20 moves along the threaded rod in the form of screw drive. Since one end of the threaded post is fixed to the second fixed ear 19, and the internal thread sleeve 20 is rotatably installed on the first fixed ear 17, and since the first fixed ear 17 and the second fixed ear 19 are respectively fixed to the frame plate 13 and the bottom plate 1, the distance between the frame plate 13 and the bottom plate 1 is adjusted;

[0075] If the frame plate 13 and the bottom plate 1 approach each other, that is, the sliding sleeve 16 on the frame plate 13 approaches the carrier 2, the hollow shell 24 on the sliding sleeve 16 approaches the first T-body 25 and the second T-body 26, and the inner top of the hollow shell 24 is pushed in. At this time, the spring 29 is compressed, so that the first T-body 25 and the second T-body 26 can be stably located in the H-shaped groove 10. At the same time, the guide block 30 on the moving bar 27 of the first T-body 25 slides along the inclined groove 33. Since the hollow shell 24 approaches the first T-body 25, the guide block 30 slides downward along the inclined groove 33, that is, the moving plate approaches the sliding bar 28 of the second T-body 26. At this time, the non-T head end of the first T-body 25 moves into the notch of the second T-body 26, and the overall length of the traction bar 11 composed of the first T-body 25 and the second T-body 26 is shortened;

[0076] After the overall length of the traction bar 11 composed of the first T-body 25 and the second T-body 26 is determined, when the variable distance operation is performed, the variable distance operation is carried out in the manner of Embodiment 1.

[0077] The above description enables those skilled in the art to implement or use the present invention. Various modifications to these embodiments will be obvious to those skilled in the art, and the general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to these embodiments shown herein, but will be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A variable pitch mechanism, comprising a bottom plate (1), characterized in that: A first fixed plate (3) and a second fixed plate (5) are fixed on the plate surface of the bottom plate (1); A plurality of pairs of positioning rods (12) are fixed between the first fixed plate (3) and the second fixed plate (5); A first moving plate (4) is slidably sleeved on the outside of each pair of the positioning rods (12) together; A moving assembly for moving the first moving plate (4) is arranged on the bottom plate (1); A plurality of carriers (2) are slidably sleeved on the outside of each pair of the positioning rods (12); An H-shaped groove (10) is formed at the bottom of the carrier (2), and the groove width at one end of the H-shaped groove (10) is smaller than that at the other end; The large-width groove of the H-shaped groove (10) is set as the head groove, and the small-width groove of the H-shaped groove (10) is set as the tail groove. The H-shaped grooves (10) of the plurality of carriers (2) on each pair of the positioning rods (12) are aligned end to end; A traction bar (11) with an H-shaped contour is slidably embedded in the head groove of each carrier (2) and the tail groove of the adjacent carrier (2), and the widths of both ends of the traction bar (11) are the same and are the same as the width of the small-width groove of the H-shaped groove (10); Each of the traction bars (11) is in contact with the bottom plate (1); One end of the traction bar (11) adjacent to the first fixed plate (3) is slidably embedded in the first fixed plate (3), and one end of the traction bar (11) adjacent to the first moving plate (4) is slidably embedded in the first moving plate (4).

2. The variable pitch mechanism according to claim 1, characterized in that: The moving assembly includes a cylinder (7), a second moving plate (6) and two pull rods (9). The cylinder (7) is fixed to the bottom plate (1), the telescopic end of the cylinder (7) is fixed to the second moving plate (6), and both ends of the two pull rods (9) are fixed to the first moving plate (4) and the second moving plate (6) respectively.

3. The variable pitch mechanism according to claim 2, characterized in that: Two positioning sleeves (8) are fixed on the plate surface of the bottom plate (1), and the two pull rods (9) are respectively slidably inserted into the two positioning sleeves (8).

4. A variable pitch mechanism according to claim 1, characterized in that: A rectangular opening is formed on the plate surface of the bottom plate (1). A frame plate (13) aligned with the bottom plate (1) is arranged outside the bottom plate (1), and an adjusting assembly for enabling the frame plate (13) to linearly move relative to the bottom plate (1) is arranged outside the bottom plate (1).

5. The variable pitch mechanism according to claim 4, characterized in that: The adjusting assembly includes a guiding structure. The guiding structure includes a plurality of positioning columns (15). One end of the positioning column (15) is fixed to the bottom plate (1), and the frame plate (13) is slidably sleeved on each of the positioning columns (15).

6. The variable pitch mechanism according to claim 5, characterized in that: The adjusting assembly further includes a first fixing ear (17), a second fixing ear (19), a threaded column, and an internal thread sleeve (20). The first fixing ear (17) is fixed to the frame plate (13), the second fixing ear (19) is fixed to the bottom plate (1), a rotation hole is formed on the outer side of the first fixing ear (17), the internal thread sleeve (20) is rotatably installed in the rotation hole, the outer side of the threaded column is threadedly installed in the internal thread sleeve (20), one end of the threaded column is fixed to the second fixing ear (19), and a rotation mechanism for rotating the internal thread sleeve (20) is arranged on the outer side of the first fixing ear (17).

7. The variable pitch mechanism according to claim 6, characterized in that: The rotation mechanism includes a servo motor (23), a first bevel gear (21), and a second bevel gear (22). The servo motor (23) is fixed to the first fixing ear (17), the output shaft of the servo motor (23) is coaxially fixed to the second bevel gear (22), the first bevel gear (21) is coaxially fixed to the internal thread sleeve (20), and the first bevel gear (21) meshes with the second bevel gear (22).

8. The variable pitch mechanism according to claim 6, characterized in that: A laser rangefinder (18) is embedded and fixed in the first fixing ear (17), and the measuring end of the laser rangefinder (18) faces the second fixing ear (19).

9. A variable pitch mechanism according to claim 4, characterized in that: A plurality of cylindrical rods (14) are commonly fixed at both ends inside the frame opening of the frame plate (13). A plurality of sliding sleeves (16) are slidably sleeved on the outer sides of the cylindrical rods (14); the sliding sleeves (16) divide the traction strip (11) into a first T-shaped body (25) and a second T-shaped body (26). The first T-shaped body (25) is located in the head groove of the H-shaped groove (10), and the second T-shaped body (26) is located in the tail groove of the H-shaped groove (10). A notch is formed at the non-T head end of the second T-shaped body (26), the non-T head end of the first T-shaped body (25) is slidably inserted into the notch, a moving strip (27) is fixed to the outer side of the first T-shaped body (25), a sliding strip (28) is fixed to the outer side of the second T-shaped body (26), a hollow shell (24) fixed to the sliding sleeve (16) is commonly slidably sleeved on the moving strip (27) and the sliding strip (28). An inclined groove (33) is formed on the outer side of the hollow shell (24). A rectangular guide block (30) is fixed to the outer side of the moving strip (27), and the guide block (30) is slidably arranged in the inclined groove (33). A top plate (31) is arranged inside the hollow shell (24). Both the moving strip (27) and the sliding strip (28) are in contact with the top plate (31). Columns (32) are fixed to the opposite sides of the hollow shell (24) and the top plate (31), and a spring (29) is commonly sleeved on the outer sides of the two columns (32).

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