A carrier positioning mechanism for unidirectional intermittent movement of a closed-loop carrier chain

Abstract

A carrier positioning mechanism for unidirectional intermittent movement of a closed-loop carrier chain, characterized in that the carrier positioning mechanism includes a positioning roller and a double-slider mechanism. This solution adopts a double-slider parallel positioning mechanism for the positioning roller installed on the carrier, and equips different sliders with springs of different elastic forces and other technical measures, thereby better overcoming the shortcomings of the existing single-slider elastic positioning mechanism, so that the carrier chain can meet the high-speed operation requirements in unidirectional intermittent movement (dynamic stop movement), reduce the carrier chain driving force and vibration, and meet the precise positioning requirements.

Description

Technical Field

[0001] The invention belongs to can body forming equipment for metal cans, and relates to equipment for forming the mouth of metal bottles and cans, and in particular to a carrier positioning mechanism for a closed-loop carrier chain with unidirectional intermittent movement in the equipment. Background Art

[0002] As people's living standards improve, high-end beverages in metal bottles and cans have various specifications in the market, especially in foreign countries where there is a large market demand. The appearance of metal bottles and cans is characterized by a conical mouth with an anti-theft groove 2 and a thread 3 for connecting the bottle cap, see Figure 1 As shown in the right figure in the figure. To manufacture it, the aluminum alloy plate must first be formed into a cylindrical shell through a stretching and thinning process (see Figure 1 The mouth (i.e., the can mouth) is then necked down multiple times to form a tapered shoulder, and the necked mouth is processed with threads, anti-theft grooves, trimming, and curling (see Figure 1 ).

[0003] At present, there are many forms of bottle mouth forming equipment, and its mainstream products are Belvac's BCMS (BottleCan Manufacturing System) and the turntable bottle mouth forming equipment of Mall Herlan, Hinterkopf, Frattini and other companies. Among them, Frattini's turntable bottle mouth forming equipment can be found in European patent EP0275369B1. The bottle mouth forming equipment of BCMS is the same as the two-piece can body necking machine, and is also modularly designed. The production capacity can reach 600 cans / minute, but its disadvantages are that it occupies a large area, is expensive, and has a large number of molds. The overall size of the turntable bottle mouth forming equipment is relatively small. The mold is installed on a huge tool plate for reciprocating motion, and the can is intermittently moved in the circumferential direction on another turntable. The problem brought about by this is that the equipment has a large vibration, and the process requirements for equipment manufacturing and assembly are very high. The equipment processing speed is low (150-200 cans / minute), and the cost performance is low.

[0004] In the bottle mouth forming equipment, the mouth forming mechanism is the core part of the whole equipment. Among them, it is an efficient and preferred solution to use a carrier chain to transport the metal can body to each station in a unidirectional intermittent movement mode and use a set of molds to perform progressive forming processing on a row of metal can bodies. Since the carrier chain needs to be positioned and stopped at each station after loading the processed metal can body in the mold progressive forming process, a special positioning mechanism is required to meet the positioning accuracy requirements. From the perspective of the unidirectional intermittent movement (dynamic stop motion) of the carrier chain along the track, ordinary technicians can easily think of an elastic positioning mechanism. Figure 2 and Figure 3 As shown, the elastic positioning mechanism 7 is composed of a positioning roller 8, a positioning block 9, a spring 10 and a positioning bracket 11, wherein the positioning roller 8 is positioned and installed on the top of the carrier 6, the positioning bracket 11 is located above the carrier 6 and is relatively fixed, a slideway is provided on the positioning bracket 11, the slideway faces the carrier 6 of the corresponding station, the positioning block 9 is located in the slideway and slides along the sliding direction of the slideway, the spring 10 presses between the positioning block 9 and the positioning bracket 11 and acts on the sliding direction of the positioning block 9, the slideway is provided with a limiting structure to limit the sliding of the positioning block 9, the positioning block 9 is provided with a positioning concave surface facing the carrier 6, and when the carrier 6 is displaced with the closed-loop carrier chain 5 in the working state, the positioning roller 8 cooperates with the positioning concave surface to form a positioning. The above positioning mechanism can meet the basic positioning function of the carrier when the carrier chain moves unidirectionally and intermittently along the track, but in actual use, since the unidirectional intermittent movement of the carrier chain has a certain moving speed and is always switching between moving and stopping, and the carrier chain itself is heavy and has a large inertia force, the actual application effect is not good. The main reasons are as follows: If the positioning concave surface of the positioning block is designed to be deeper and a larger spring top pressure is used, the result is that it is beneficial to increase the running speed, achieve rapid positioning, and ensure positioning accuracy, but the disadvantage is that the carrier chain requires a large driving force and the equipment vibrates greatly. If the positioning concave surface of the positioning block is designed to be shallower and the spring top pressure is reduced, the result is that the former's disadvantage is overcome, but the positioning accuracy is reduced and it is easy to slip due to inertia during high-speed movement. The two are contradictory and cannot be satisfied at the same time.

[0005] In view of this, how to design a device that can meet the high-speed operation requirements, reduce the carrier chain driving force and meet the precise positioning requirements is the research topic of the present invention. Summary of the invention

[0006] The present invention provides a carrier positioning mechanism for unidirectional intermittent movement of a closed-loop carrier chain, and its purpose is to provide a carrier positioning mechanism that can meet the requirements of high-speed operation, reduce the driving force of the carrier chain and meet the requirements of precise positioning, and overcome the shortcomings of the above-mentioned existing designs, namely, either the driving force of the carrier chain is large and the equipment vibration is large, or the positioning accuracy is reduced and it is easy to slip.

[0007] To achieve the above-mentioned purpose, the technical solution adopted by the present invention is: a carrier positioning mechanism with unidirectional intermittent movement of a closed-loop carrier chain, the innovation of which is that the carrier positioning mechanism includes a positioning roller and a double slider mechanism, wherein:

[0008] The positioning roller is a roller structure used to position the carrier relative to the workstation on the track. The positioning roller is installed on the carrier and moves or positions along with the carrier on the track.

[0009] The double slider mechanism has a positioning bracket, which is a seat structure, and the seat is fixedly connected to the track that carries the carrier chain, or is an integral structure with the track. The positioning bracket is provided with a slideway, and the direction of the slideway is perpendicular to the moving direction of the carrier. The slideway is provided with a first positioning slider and a second positioning slider in parallel, and a first spring is provided for the first positioning slider, and a second spring is provided for the second positioning slider. The first spring presses between the first positioning slider and the positioning bracket and acts in the sliding direction of the first positioning slider, and the second spring presses between the second positioning slider and the positioning bracket and acts in the sliding direction of the second positioning slider. The slideways are respectively provided with limiting structures that limit the first positioning slider and the second positioning slider from sliding out of the slideways. The first positioning slider is located in the slideway at the side where the positioning roller rolls in, and the second positioning slider is located in the slideway at the side where the positioning roller rolls out. The first positioning slider is provided with a guiding surface and a first positioning surface facing the rim of the positioning roller, the guiding surface is located at the side where the positioning roller rolls in, and the first positioning surface is located at the side where the positioning roller rolls out, the guiding surface is an inclined surface or an arc surface, and the guiding surface is higher at the entry end and lower at the exit end in the direction of the slideway, the first positioning surface is an inclined surface or an arc surface, and the first positioning surface is lower at the entry end and higher at the exit end in the direction of the slideway, the second positioning slider is provided with a second positioning surface facing the rim of the positioning roller, the second positioning surface is an inclined surface or an arc surface, and the second positioning surface is higher at the entry end and lower at the exit end in the direction of the slideway, the first positioning surface is adjacent to the second positioning surface and forms a positioning concave surface; the first spring top pressure acting on the first positioning slider is greater than the second spring top pressure acting on the second positioning slider.

[0010] The relevant contents in the above technical solution are explained as follows:

[0011] 1. In the above scheme, the "carrier" is a device used to install and position the formed can body. The existing technology can be used in the present invention, so there is no specific limitation or detailed description for this, which is known to those skilled in the art. The "carrier chain" refers to a closed-loop chain structure formed by a number of identical carriers connected end to end and connected in series, with the carriers as chain links.

[0012] 2. In the above solution, the “track” refers to a channel specially used to carry the ring carrier chain and capable of moving along the track direction of the track.

[0013] 3. In the above solution, the “limiting structure for limiting the first positioning slider and the second positioning slider from sliding out of the slideway” refers to a step or a blocking block or the like that can limit the slider from sliding out of the slideway.

[0014] 4. In the above scheme, a lifting mechanism is provided for the second positioning slider, and the lifting mechanism includes a lifting roller, a wedge block and a sliding bar, wherein the lifting roller is positioned and installed on the second positioning slider, the wedge block is fixed on the sliding bar, the sliding bar is slidably connected with the track of the carrier chain, the sliding direction is parallel to the moving direction of the carrier, and the wedge surface of the wedge block cooperates with the rim of the lifting roller. In the working state, when it is necessary to release the positioning of the carrier, a driving mechanism drives the wedge block to move through the sliding bar, and the wedge surface of the wedge block acts on the rim of the lifting roller to slide and lift the second positioning slider upward, thereby releasing the second positioning surface on the second positioning slider from limiting the positioning roller.

[0015] 5. In the above solution, the projection length of the guiding surface in the moving direction of the carrier is greater than the projection length of the first positioning surface in the moving direction of the carrier.

[0016] 6. In the above solution, the guide surface is relatively flat, and the first positioning surface and the second positioning surface are relatively steep.

[0017] 7. In the above solution, the guide surface is an inclined surface, and the first positioning surface and the second positioning surface are both arc surfaces.

[0018] 8. In the above solution, the guide surface, the first positioning surface and the second positioning surface are all inclined surfaces.

[0019] 9. In the above solution, the guide surface, the first positioning surface and the second positioning surface are all arc surfaces.

[0020] 10. In the above scheme, a first adjusting screw is provided for the first spring, a first screw hole is provided on the positioning bracket, the first adjusting screw is screwed into the first screw hole, and the first adjusting screw acts on the top pressure direction of the first spring. A second adjusting screw is provided for the second spring, a second screw hole is provided on the positioning bracket, the second adjusting screw is screwed into the second screw hole, and the second adjusting screw acts on the top pressure direction of the second spring.

[0021] 11. In the above scheme, the carrier positioning mechanism includes an auxiliary deceleration structure, which is composed of an auxiliary deceleration roller, a deceleration block and a deceleration spring, wherein the auxiliary deceleration roller is positioned and installed on the carrier, the deceleration block is a block and is rotatably positioned on the moving path of the auxiliary deceleration roller, and the deceleration spring is pressed between the deceleration block and the track carrying the carrier chain, and acts on the path that hinders the advancement of the auxiliary deceleration roller.

[0022] The design principle and concept of the present invention is: in order to solve the problems of large driving force, large equipment vibration and poor positioning accuracy in the unidirectional intermittent movement (stop-and-go motion) of the carrier chain caused by the existing elastic positioning mechanism, the present invention adopts a double-slider parallel positioning mechanism for the positioning roller installed on the carrier, and equips different sliders with springs with different elastic forces and other technical measures, thereby better overcoming the shortcomings of the existing single-slider elastic positioning mechanism, so that the carrier chain can meet the high-speed operation requirements in the unidirectional intermittent movement (stop-and-go motion) while reducing the driving force and vibration of the carrier chain and meeting the precise positioning requirements.

[0023] Due to the adoption of the above technical measures, the present invention has the following advantages and effects compared with the existing single-slider elastic positioning mechanism:

[0024] 1. The present invention adopts a double-slider parallel positioning mechanism for the positioning roller installed on the carrier, and equipping different sliders with springs of different elastic forces can effectively alleviate the vibration generated during the dynamic and stop movement of the carrier, reduce the driving force of the carrier chain, and achieve precise positioning. The specific principle and effect are: the first positioning slider is provided with a guide surface and a first positioning surface facing the positioning roller, and the second positioning slider is provided with a second positioning surface facing the positioning roller. Among them, the guide surface is used to decelerate the carrier loaded with the tank body. The guide surface is designed to be relatively flat and equipped with a first spring with a large elastic force. It can play a good buffering and deceleration effect in a short time, and also has a good vibration reduction effect. It can be seen from this that the main function of the first positioning slider is buffering and deceleration. This is also the main reason why the top pressure of the first spring acting on the first positioning slider is greater than the top pressure of the second spring acting on the second positioning slider. The first positioning surface on the first positioning slider and the second positioning surface on the second positioning slider jointly form a positioning concave surface, that is, they play a positioning role together. In this way, on the one hand, the carrier can be quickly and accurately positioned, and on the other hand, vibration can be reduced. Since the first positioning slider and the second positioning slider are subjected to different pressing forces, theoretically, it is better that the projection length of the guide surface in the moving direction of the carrier is greater than the projection length of the first positioning surface in the moving direction of the carrier.

[0025] 2. The present invention provides a lifting mechanism for the second positioning slide block, which can not only meet the precise positioning requirements in practical applications, but also effectively alleviate the vibration generated by the carrier from positioning to starting, and can effectively reduce the driving force of the carrier chain.

[0026] 3. The present invention provides a guide surface and a first positioning surface on the first positioning slider facing the positioning roller rim, and a second positioning surface on the second positioning slider facing the positioning roller rim. Such a double slider design plus the cooperation of the guide surface, the first positioning surface and the second positioning surface can effectively buffer and control the impact and vibration caused by the vehicle's movement and stop, and effectively reduce the vehicle chain driving force. The effect is more obvious when the guide surface is relatively flat.

[0027] 4. The present invention is provided with a first adjusting screw for the first spring and a second adjusting screw for the second spring, and the elastic force of the first spring and the second spring can be adjusted according to actual needs, which is beneficial for installation and debugging, and also convenient for adjusting the size of the elastic force.

[0028] 5. The present invention also provides an auxiliary deceleration structure for the carrier, which can achieve the best effect when used in combination with the guide surface and positioning rollers in the double slider mechanism for decelerating the carrier loaded with the tank body. Because in this combined use design, the guide surface and positioning rollers buffer and decelerate the carrier at the top, while the auxiliary deceleration structure buffers and decelerates the carrier at the bottom at the same time, so the combination of the two not only buffers and decelerates the carrier from the perspective of balancing inertia, but also can assist the carrier in achieving rapid and accurate positioning, which is conducive to increasing the moving speed of the carrier chain and meeting the high-speed operation requirements. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Attached Figure 1 This is a schematic diagram of the bottle molding of the present invention;

[0030] Attached Figure 2 It is the layout diagram of the existing positioning mechanism;

[0031] Attached Figure 3 A magnified view of the existing positioning mechanism;

[0032] Attached Figure 4 It is the layout diagram of the positioning mechanism of the present invention;

[0033] Attached Figure 5 It is an enlarged view of the positioning mechanism of the present invention;

[0034] Attached Figure 6 It is a three-dimensional diagram of the carrier shifting mechanism of the present invention;

[0035] Attached Figure 7 It is a three-dimensional diagram of the oblong track of the present invention;

[0036] Attached Figure 8 It is a front perspective view of the carrier and tank of the present invention;

[0037] Attached Fig. 9 It is a three-dimensional view of the back of the carrier and the tank body of the present invention.

[0038] In the above drawings: 1. tank body; 2. anti-theft groove; 3. thread; 4. track; 5. carrier chain; 6. carrier; 7. elastic positioning mechanism; 8. positioning roller; 9. positioning block; 10. spring; 11. positioning bracket; 12. double slider mechanism; 13. first positioning slider; 14. second positioning slider; 15. lifting roller; 16. first spring; 17. second spring; 18. wedge block; 19. sliding bar; 20. linear guide; 21. deceleration block; 22. deceleration spring; 23. first adjusting screw; 24. second adjusting screw; 25. shift roller; 26. guide roller; 27. carrier roller; 28. auxiliary deceleration roller. DETAILED DESCRIPTION

[0039] The present invention will be further described below in conjunction with the accompanying drawings and embodiments:

[0040] Embodiment: A carrier positioning mechanism for a closed-loop carrier chain with unidirectional intermittent movement,

[0041] like Figure 4-9 As shown, the carrier positioning mechanism includes a positioning roller 8 and a double slider mechanism 12, wherein:

[0042] The positioning roller 8 is a roller structure used to position the carrier 6 relative to the workstation on the track 4 (see Figure 4 and Figure 5 ,), the positioning roller 8 is positioned and installed on the carrier 6 and moves or positions with the carrier 6 on the track 4 (see Figure 4 , Figure 5 , Figure 8 and Fig. 9 The carrier 6 is a device for installing and positioning the formed can body 1 (see Figure 8 and Fig. 9 In the present invention, the carrier 6 uses the existing technology, which is not specifically limited or described in detail. The track 4 refers to a channel specifically used to carry the ring carrier chain 5 and can move along the track direction of the track 4 (see Figure 6 and Figure 7 The carrier chain 5 refers to a closed-loop chain structure formed by connecting a plurality of identical carriers 5 end to end and connecting them in series, with the carriers 5 serving as chain links (see Figure 6 ).

[0043] The double slider mechanism 12 has a positioning bracket 11 (see Figure 5 ), the positioning bracket 11 is a seat structure, the seat is fixedly connected to the track 4 carrying the carrier chain 5, or is an integral structure with the track 4. In this embodiment, the positioning bracket 11 is fixed on the track 4 as an independent component and is located above the track of the positioning roller 8. The positioning bracket 11 is provided with a slideway (not shown in the figure, but can be provided according to the embodiment of the present invention). Figure 5Imagine a slideway), the slideway direction is perpendicular to the moving direction of the carrier 6, and a first positioning slider 13 and a second positioning slider 14 are arranged side by side in the slideway (see Figure 5 A first spring 16 is provided for the first positioning slide block 13, and a second spring 17 is provided for the second positioning slide block 14 (see Figure 5 ), the first spring 16 presses between the first positioning slider 13 and the positioning bracket 11 and acts on the sliding direction of the first positioning slider 13, and the second spring 17 presses between the second positioning slider 14 and the positioning bracket 11 and acts on the sliding direction of the second positioning slider 14 (see Figure 5 The slideway is provided with a limiting structure (not shown in the figure, but can be configured according to the Figure 5 Imagine a limiting structure, such as a step or a blocking block on the slideway. The first positioning slide block 13 is located on the side where the positioning roller 8 rolls in the slideway (see Figure 5 The second positioning slide block 14 is located on the side where the positioning roller 8 rolls out in the slideway (see Figure 5 The first positioning slide block 13 is provided with a guide surface and a first positioning surface facing the wheel edge of the positioning roller 8 (see Figure 5 The lower end surface of the first positioning slide block 13 has a guide surface located on the side where the positioning roller 8 rolls in (see Figure 5 The guide surface is the lower end surface on the left side of the first positioning slide block 13. The first positioning surface is located on the side where the positioning roller 8 rolls out (see Figure 5 The first positioning surface is the lower end surface on the right side of the first positioning slider 13). The guide surface is an inclined surface or an arc surface, and the guide surface is higher at the entry end and lower at the exit end in the direction of the slideway (here the height refers to the relative height in the direction of the vertical center moving track with the center moving track of the positioning roller 8 as a reference). The first positioning surface is an inclined surface or an arc surface, and the first positioning surface is lower at the entry end and higher at the exit end in the direction of the slideway (here the height has the same meaning as above). The second positioning slider 14 is provided with a second positioning surface facing the wheel edge of the positioning roller 8 (see Figure 5 The second positioning slide block 14 has a lower end surface, and the second positioning surface is an inclined surface or an arc surface. The second positioning surface is higher at the entry end and lower at the exit end in the slideway direction (here the high and low have the same meaning as above). The first positioning surface is adjacent to the second positioning surface and forms a positioning concave surface (see Figure 5 ). In this embodiment, Figure 5 The guide surface is an inclined surface, and the first positioning surface and the second positioning surface are both cambered surfaces. Moreover, the guide surface is relatively flat, and the first positioning surface and the second positioning surface are relatively steep. This design is the best, but the present invention is not limited thereto. The guide surface, the first positioning surface and the second positioning surface can all be designed as inclined surfaces. The guide surface, the first positioning surface and the second positioning surface can also be designed as cambered surfaces, or even other combinations, which are easy to understand and accept by those skilled in the art after reading.

[0044] In order to ensure the effect of the present invention, the present invention is equipped with springs of different elastic forces for different sliders, that is, the top pressure of the first spring 16 acting on the first positioning slider 13 is designed to be greater than the top pressure of the second spring 17 acting on the second positioning slider 14. In addition, in the present invention, it is preferred that the projection length of the guide surface in the moving direction of the carrier 6 is greater than the projection length of the first positioning surface in the moving direction of the carrier 6 (see Figure 5 ).

[0045] In this embodiment, in order to further improve the effect of the carrier positioning mechanism, a lifting mechanism is provided for the second positioning slide block 14, and the lifting mechanism is composed of a lifting roller 15, a wedge block 18, a sliding bar 19 and a linear guide rail 20 (see Figure 4 and Figure 5 ), wherein the lifting roller 15 is positioned and installed on the second positioning slide block 14 (see Figure 5 ), the wedge block 18 is fixed on the sliding bar 19 (see Figure 5 ), the slide bar 19 is installed on the linear guide 20 (see Figure 4 ), so that the sliding bar 19 is slidably connected with the track 4 carrying the carrier chain 5, the sliding direction is parallel to the moving direction of the carrier 6, and the wedge surface of the wedge block 18 cooperates with the rim of the lifting roller 15 (see Figure 5 In the working state, when the positioning of the carrier 6 needs to be released, a driving mechanism drives the wedge block 18 to move through the sliding bar 19, and the wedge surface of the wedge block 18 acts on the rim of the lifting roller 15 to slide the second positioning slider 14 upward and lift it, releasing the second positioning surface on the second positioning slider 14 from limiting the positioning roller 8 (see Figure 5 ).

[0046] In this embodiment, in order to adjust the elastic force of the first spring 16 and the second spring 17, a first adjusting screw 23 (see Figure 5 ), the positioning bracket 11 is provided with a first screw hole, the first adjusting screw 23 is screwed into the first screw hole, and the first adjusting screw 23 acts on the top pressure direction of the first spring 16. A second adjusting screw 24 is provided for the second spring 17 (see Figure 5 ), the positioning bracket 11 is provided with a second screw hole, and the second adjusting screw 24 is screwed into the second screw hole, and the second adjusting screw 24 acts on the top pressure direction of the second spring 17.

[0047] In this embodiment, in order to further improve the deceleration effect of the carrier positioning mechanism, the carrier positioning mechanism is further provided with an auxiliary deceleration structure, which is composed of an auxiliary deceleration roller 28, a deceleration block 21 and a deceleration spring 22 (see Figure 4), wherein the auxiliary deceleration roller 28 is positioned and installed on the carrier 6 (in this embodiment, it is installed at the bottom of the carrier 6, but it is not limited to this and can also be installed at other positions). The deceleration block 21 is a block and is rotatably positioned on the moving path of the auxiliary deceleration roller 28 (in this embodiment, a groove is provided on the track 4 corresponding to the auxiliary deceleration roller 28, and the deceleration block 21 is placed in the groove and is rotatably positioned in the groove, wherein the top of the deceleration block 21 is exposed from the groove and falls on the moving path of the auxiliary deceleration roller 28), and the deceleration spring 22 is pressed between the deceleration block 21 and the track 4 carrying the carrier chain 5 (in this embodiment, the deceleration spring 22 is located in the groove and pressed between the deceleration block 21 and the groove), and acts on the path that hinders the auxiliary deceleration roller 28 from moving forward. When working, the auxiliary deceleration structure is used in combination with the guide surface and positioning rollers in the double slider mechanism for decelerating the carrier loaded with the tank body. The guide surface and the positioning rollers buffer and decelerate the carrier 6 at the top, while the auxiliary deceleration structure buffers and decelerates the carrier 6 at the bottom at the same time. The combination of the two not only buffers and decelerates the carrier 6 from the perspective of balanced inertia, but also can assist the carrier to achieve fast and accurate positioning, which is beneficial to increase the moving speed of the carrier chain and meet the requirements of high-speed operation.

[0048] The above embodiments are only for illustrating the technical concept and features of the present invention, and their purpose is to enable people familiar with the technology to understand the content of the present invention and implement it accordingly, and they cannot be used to limit the protection scope of the present invention. Any equivalent changes or modifications made according to the spirit of the present invention should be included in the protection scope of the present invention.

Claims

1. A carrier positioning mechanism for a closed-loop carrier chain with unidirectional intermittent movement, characterized in that: The carrier positioning mechanism comprises a positioning roller (8) and a double slider mechanism (12), wherein: The positioning roller (8) is a roller structure used to position the carrier (6) on the track (4) relative to the workstation; the positioning roller (8) is installed on the carrier (6) and moves or is positioned along with the carrier (6) on the track (4); The double slider mechanism (12) comprises a positioning bracket (11), the positioning bracket (11) being a seat structure, the seat being fixedly connected to a track (4) carrying a carrier chain (5), or being an integral structure with the track (4); a slideway is provided on the positioning bracket (11), the direction of the slideway being perpendicular to the moving direction of the carrier (6), a first positioning slider (13) and a second positioning slider (14) being arranged in parallel in the slideway, a first spring (16) being provided for the first positioning slider (13), and a second spring (17) being provided for the second positioning slider (14), the first spring (16) pressing between the first positioning slider (13) and the positioning bracket (11) and acting in the sliding direction of the first positioning slider (13), the second spring (17) pressing between the second positioning slider (14) and the positioning bracket (11) and acting in the sliding direction of the second positioning slider (14); the slideway is provided with springs for limiting the sliding of the first positioning slider (13) and the second positioning slider (14), respectively. The limiting structure of the slideway; the first positioning slider (13) is located on the side where the positioning roller (8) rolls in in the slideway, the second positioning slider (14) is located on the side where the positioning roller (8) rolls out in the slideway, the first positioning slider (13) is provided with a guide surface and a first positioning surface facing the wheel edge of the positioning roller (8), the guide surface is located on the side where the positioning roller (8) rolls in, the first positioning surface is located on the side where the positioning roller (8) rolls out, the guide surface is an inclined surface or an arc surface, the guide surface is higher at the entry end and lower at the exit end in the slideway direction, and the first positioning surface is provided on the wheel edge of the positioning roller (8). The positioning surface is an inclined surface or an arc surface, the first positioning surface is lower at the entry end and higher at the exit end in the direction of the slideway, the second positioning slider (14) is provided with a second positioning surface facing the rim of the positioning roller (8), the second positioning surface is an inclined surface or an arc surface, the second positioning surface is higher at the entry end and lower at the exit end in the direction of the slideway, the first positioning surface is adjacent to the second positioning surface and forms a positioning concave surface; the pressing force of the first spring (16) acting on the first positioning slider (13) is greater than the pressing force of the second spring (17) acting on the second positioning slider (14).

2. The carrier positioning mechanism according to claim 1, characterized in that: A lifting mechanism is provided for the second positioning slider (14), the lifting mechanism comprising a lifting roller (15), a wedge block (18) and a sliding bar (19), wherein the lifting roller (15) is positioned and mounted on the second positioning slider (14), the wedge block (18) is fixed on the sliding bar (19), the sliding bar (19) is slidably connected relative to a track (4) carrying a carrier chain (5), the sliding direction is parallel to the moving direction of the carrier (6), and the wedge surface of the wedge block (18) cooperates with the wheel rim of the lifting roller (15); In the working state, when it is necessary to release the positioning of the carrier (6), a driving mechanism drives the wedge block (18) to move via the sliding bar (19), and the wedge surface of the wedge block (18) acts on the rim of the lifting roller (15) to slide the second positioning slider (14) upward and lift it, thereby releasing the second positioning surface on the second positioning slider (14) from limiting the positioning roller (8).

3. The carrier positioning mechanism according to claim 1, characterized in that: The projection length of the guide surface in the moving direction of the carrier (6) is greater than the projection length of the first positioning surface in the moving direction of the carrier (6).

4. The carrier positioning mechanism according to claim 1, characterized in that: The guide surface is relatively gentle, and the first positioning surface and the second positioning surface are relatively steep.

5. The carrier positioning mechanism according to claim 1, characterized in that: The guide surface is an inclined surface, and the first positioning surface and the second positioning surface are both arc surfaces.

6. The carrier positioning mechanism according to claim 1, characterized in that: The guide surface, the first positioning surface and the second positioning surface are all inclined surfaces.

7. The carrier positioning mechanism according to claim 1, characterized in that: The guide surface, the first positioning surface and the second positioning surface are all arc surfaces.

8. The carrier positioning mechanism according to claim 1, characterized in that: A first adjusting screw (23) is provided for the first spring (16), a first screw hole is provided on the positioning bracket (11), the first adjusting screw (23) is screwed into the first screw hole, and the first adjusting screw (23) acts on the top pressure direction of the first spring (16); a second adjusting screw (24) is provided for the second spring (17), a second screw hole is provided on the positioning bracket (11), the second adjusting screw (24) is screwed into the second screw hole, and the second adjusting screw (24) acts on the top pressure direction of the second spring (17).

9. The carrier positioning mechanism according to claim 1, characterized in that: The carrier positioning mechanism comprises an auxiliary deceleration structure, which is composed of an auxiliary deceleration roller (28), a deceleration block (21) and a deceleration spring (22), wherein the auxiliary deceleration roller (28) is positioned and installed on the carrier (6), the deceleration block (21) is a block and is rotatably positioned on the moving path of the auxiliary deceleration roller (28), and the deceleration spring (22) is pressed between the deceleration block (21) and the track (4) carrying the carrier chain (5), and acts on the path that hinders the auxiliary deceleration roller (28) from moving forward.

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