Pre-overturning mechanism suitable for stacking and packaging plastic cups

Abstract

The utility model discloses a pre-turnover mechanism suitable for plastic cup stacking packaging, and relates to the technical field of plastic cup production, the pre-turnover mechanism comprises a support plate 1, a support plate 2 and a support plate 4, a slide block 1 is slidingly arranged on the top of the support plate 1, a slide block 2 is slidingly arranged on one side wall of the support plate 2, and a slide block 3 is slidingly arranged on one side wall of the support plate 4. A turn-over mechanism is arranged on the side, away from the first supporting plate, of the first sliding block and comprises a fixing frame, the fixing frame is fixedly connected to the side wall, away from the first supporting plate, of the first sliding block, the longitudinal section, in the length direction of the first supporting plate, of the fixing frame is in an n shape, and an opening is formed back to the first supporting plate; according to the plastic cup turnover device, the turnover mechanism is matched with the clamping mechanism, the plastic cups conveyed from the conveying belt can be horizontally turned over after being clamped, turnover efficiency is improved, turnover operation of a row of plastic cups can be processed at a time, and time and labor cost needed by turnover are reduced.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of plastic cup production, specifically to the pre-overturning mechanism suitable for plastic cup stacking package. BACKGROUND

[0002] Plastic cups, as a kind of widely used daily necessities, are widely welcomed by consumers because of their lightness, durability, low cost and easy manufacturing, etc. They are usually used for beverage containers, and plastic cups can be seen in families, offices or public places. With the development of plastic processing technology, the material of plastic cups has developed from single polyethylene (PE) to polypropylene (PP), polystyrene (PS) and other materials to meet the needs of different occasions and purposes.

[0003] In the production process of plastic cups, in order to facilitate subsequent processing steps (such as printing, labeling, etc.) and packaging process, for example, in the printing process, overturning the cup can ensure that the printed pattern can be evenly and accurately applied to the specified position of the cup, or in the packaging stage, they can be more easily stacked, arranged and transported, so it is necessary to adjust the plastic cup to the appropriate posture after production.

[0004] In the existing plastic cup production process, plastic cups are usually formed in multiple by injection molding process in a mold. For example, taking one of Shanghai Yiyou's plastic cup production equipment as an example, these plastic cups are often arranged in a rectangular array in the mold to improve production efficiency. However, this arrangement method brings inconvenience to the subsequent packaging and transportation process. Because the plastic cups are arranged in a rectangular array and contact each other, the overturning operation becomes complex and tedious, and manual overturning is usually required.

[0005] Therefore, the present application is proposed. UTILITY MODEL CONTENT

[0006] The utility model aims at providing a pre-overturning mechanism suitable for plastic cup stacking package to solve the problems in the above background technology.

[0007] To solve the above technical problems, the pre-overturning mechanism suitable for plastic cup stacking package provided by the utility model comprises a support plate one, a support plate two and a support plate four. A sliding block one is slidably arranged on the top of the support plate one. A sliding block two is slidably arranged on one side wall of the support plate two. A sliding block three is slidably arranged on one side wall of the support plate four. The side of the sliding block one away from the support plate one is provided with a surface turning mechanism.

[0008] The fixed frame is fixedly connected to one side wall of the sliding block away from the support plate one, the longitudinal section of the fixed frame along the length direction of the support plate one is in the shape of "door" and is arranged with the opening facing away from the support plate one, the end of the inner side wall of the fixed frame away from the support plate one is fixedly provided with a horizontally arranged baffle one, the middle part of the inner side wall of the fixed frame close to the support plate one is fixedly provided with a limiting block, and the longitudinal section of the limiting block along the length direction of the support plate one is in the shape of isosceles triangle and is arranged with the tip end facing away from the support plate one;

[0009] The support block is fixed to the sliding block two, and the sliding block two and the support plate two are arranged on the same side of the support plate one, the length direction of the support block is perpendicular to the length direction of the support plate one, the center of the horizontal side wall of the support block close to the support plate one is provided with a channel one along the length direction of the support block, and the channel one is rotationally provided with a rotating shaft one; the rotating plate is fixed to the end of the rotating shaft one away from the support plate one, the rotating plate is located on the side of the support block away from the support plate one, the bottom of the support block is fixedly provided with a vertically arranged fixed rod at the middle part of the end away from the support plate three, the end of the rotating plate away from the axis of the rotating shaft one is sleeved with a tension spring, and the end of the tension spring away from the rotating plate is sleeved on the end of the fixed rod away from the support block;

[0010] The rotating block is fixed to the end of the outer arc wall of the rotating shaft one close to the fixed frame, the outer arc wall of the rotating block is fixedly provided with a support rod one, the end of the support rod one away from the rotating block is fixedly provided with a limiting column one, and the limiting column one is arranged to face away from the support block and the axis of the limiting column one is parallel to the width direction of the support plate one.

[0011] Further, the support rod one on the outer arc wall of the rotating block is provided with two, and the length directions of the two support rod ones are respectively consistent with the radial direction of the rotating block, the included angle between the two support rod ones is obtuse, the limiting column one is fixed to the side wall away from the rotating shaft one at the end of the support rod one away from the rotating block, the outer arc wall of the rotating plate is fixedly provided with a support rod two, the length direction of the support rod two is consistent with the radial direction of the rotating plate, the end of the support rod two away from the rotating plate is fixedly provided with a fixed column one on the side wall away from the support block, the end of the fixed rod away from the support block is fixedly provided with a fixed column two on the side wall away from the support plate one, and the outer arc walls of the fixed column one and the fixed column two are sleeved with the same tension spring.

[0012] Further, the side wall of the support block away from the support plate one is fixedly provided with a limiting column two at both ends along the width direction of the support block outside the rotating plate, the axis of the limiting column two is parallel to the length direction of the support block, the support rod two is located at the top of the limiting column two, and when the support rod two on the outer arc wall of the rotating plate is rotated to the horizontal state, the support rod two abuts against the outer arc wall of the limiting column two.

[0013] Further, one side wall of the rotating shaft 1 away from the support block is fixed with a horizontally arranged support plate 3, the center of the side wall of the support plate 3 away from the rotating shaft 2 is fixed with a rotating shaft 2 with the same structure, the end of the rotating shaft 2 away from the support plate 3 is fixed on the sliding block 3, the side of the sliding block 3 away from the support plate 3 is sliding on the support plate 4, the outer arc wall of the rotating shaft 2 is fixed with a rotating disc, the outer edge of the side wall of the rotating disc close to the support plate 3 is fixed with a motor, the output end of the motor is arranged towards the support plate 3, the end of the motor away from the rotating disc is fixed with a lead screw, the end of the lead screw away from the motor penetrates into the support plate 3, the sliding block 4 is threadedly connected on the outer arc wall of the lead screw corresponding to the position of the channel 2, the side walls of the sliding block 4 and the inner tooth ring close to each other are both provided with teeth, and the teeth on the side walls of the sliding block 4 and the inner tooth ring close to each other are meshed.

[0014] Further, the top and bottom of the support plate 3 are both fixedly connected with the same structure of the baffle 2, the longitudinal section of the baffle 2 along the width direction of the support plate 3 is "L" shaped, a plurality of equally spaced linearly distributed vertical through channels 2 are formed on the top of the support plate 3 along the length direction of the center line, the support plate 3 is a hollow structure, and the channel 2 is provided with a clamping mechanism; the clamping mechanism arranged in the channel 2 on the support plate 3 comprises an inner tooth ring rotatably connected to the inner wall of the bottom of the support plate 3 corresponding to the position of the channel 2, the inner tooth ring is located in the channel 2, a plurality of gear rings are in annular array distribution on the inner tooth ring in the axial direction and are meshingly connected to the inner side of the inner tooth ring, and the outer side of the gear ring is meshingly connected with a rack plate, and the rack plate is located on the top of the inner tooth ring and the length direction of the rack plate is consistent with the radial direction of the inner tooth ring.

[0015] Further, the side wall of the rack plate close to the axis of the inner tooth ring is fixed with a horizontally arranged push rod, the axial direction of the push rod is consistent with the radial direction of the inner tooth ring, a plurality of fixed ear seats in annular array distribution on the inner tooth ring in the axial direction are fixed on the inner arc wall of the channel 2, a plurality of the push rods correspond to a plurality of the fixed ear seats one by one, the side of the fixed ear seat away from the inner arc wall of the channel 2 is rotatably connected with a limiting clamp, and the end of the push rod away from the rack plate penetrates through the inner arc wall of the channel 2 and is rotatably connected with the limiting clamp.

[0016] Compared with the prior art, the utility model has the advantages that:

[0017] 1. The turnover mechanism cooperates with the clamping mechanism to clamp and horizontally overturn the plastic cups transported from the conveying belt, improve the turnover efficiency, and process the turnover operation of a row of plastic cups at a time, thereby reducing the time and labor cost required for turnover.

[0018] 2. The clamping mechanism can keep the plastic cups stable during the turnover process, avoid damage or deformation caused by improper turnover, and adapt to plastic cups of various sizes, thereby improving the adaptability of the clamping mechanism. BRIEF DESCRIPTION OF DRAWINGS

[0019] Figure 1 The overall structure diagram of the pre-overturning mechanism suitable for the plastic cup stacking package;

[0020] Figure 2 The structure diagram of the front view of the turnover mechanism in the pre-overturning mechanism suitable for the plastic cup stacking package;

[0021] Figure 3 The structure diagram of the rear view of the turnover mechanism in the pre-overturning mechanism suitable for the plastic cup stacking package;

[0022] Figure 4 The connection diagram of the motor and the support plate three in the pre-overturning mechanism suitable for the plastic cup stacking package;

[0023] Figure 5 The structure diagram of the clamping mechanism in the pre-overturning mechanism suitable for the plastic cup stacking package.

[0024] In the drawings:

[0025] 10, support plate one; 11, sliding block one; 12, fixed frame; 13, baffle one; 14, limiting block; 15, rotating block; 16, limiting column one;

[0026] 20, rotating shaft one; 21, supporting block; 22, rotating plate; 23, limiting column two; 24, tension spring; 25, fixed rod; 26, sliding block two; 27, support plate two;

[0027] 30, baffle two; 31, support plate three; 32, rotating disc; 33, sliding block three; 34, support plate four; 35, motor;

[0028] 40, lead screw; 41, sliding block four; 42, internal tooth ring; 43, gear; 44, rack plate; 45, push rod; 46, limiting clamp; 47, fixed lug. DETAILED DESCRIPTION

[0029] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of the present application.

[0030] Please refer to the drawings Figure 1 to the drawings Figure 5The utility model provides a pre -turning mechanism suitable for plastic cup stacking package, including support plate one 10, support plate two 27 and support plate four 34, the top of support plate one 10 has the sliding block one 11, the side wall of support plate two 27 has the sliding block two 26, the side wall of support plate four 34 has the sliding block three 33, the side of sliding block one 11 away from support plate one 10 is equipped with the mechanism of turning over, and the mechanism of turning over includes:

[0031] Fixed frame 12 is fixedly connected on the side wall of sliding block one 11 away from support plate one 10, and the longitudinal section of fixed frame 12 along the length direction of support plate one 10 is "door" shape and is arranged with the opening facing away from support plate one 10, the end of fixed frame 12 away from support plate one 10 on the inner side wall of mutual approach is fixed with the horizontally arranged baffle one 13, and the middle part of the inner side wall of fixed frame 12 close to support plate one 10 is fixed with the limiting block 14, and the longitudinal section of limiting block 14 along the length direction of support plate one 10 is isosceles triangle and is arranged with the tip end facing away from support plate one 10;

[0032] Support block 21 is fixed on sliding block two 26, and sliding block two 26 and support plate two 27 are arranged on the same side of support plate one 10, and the length direction of support block 21 is perpendicular to the length direction of support plate one 10, and the horizontal side wall center of support block 21 close to support plate one 10 is provided with passageway one along the length direction of support block 21, and the passageway one is rotationally provided with pivot one 20;

[0033] Rotating plate 22 is fixed on the end of pivot one 20 away from support plate one 10, and rotating plate 22 is located on the side of support block 21 away from support plate one 10, and the middle part of the end of support block 21 bottom away from support plate three 31 is fixed with the vertically arranged fixed rod 25, and the end of rotating plate 22 away from the axis of pivot one 20 is sleeved with the tension spring 24, and the end of tension spring 24 away from rotating plate 22 is sleeved on the end of fixed rod 25 away from support block 21;

[0034] Rotating block 15 is fixed on the end of the outer arc wall of pivot one 20 close to fixed frame 12, and the outer arc wall of rotating block 15 is fixed with support rod one, and the end of support rod one away from rotating block 15 is fixed with limiting column one 16, and limiting column one 16 is arranged facing away from support block 21, and the axial direction of limiting column one 16 is parallel to the width direction of support plate one 10;

[0035] Two support rods one are arranged on the outer arc wall of the rotating block 15, and the length directions of the two support rods one are respectively consistent with the radial direction of the rotating block 15, the included angle between the two support rods one is obtuse, one end of the support rod one away from the rotating block 15 is fixed on the side wall away from the rotating shaft one 20, the support rod two is fixed on the outer arc wall of the rotating plate 22, the length direction of the support rod two is consistent with the radial direction of the rotating plate 22, the fixed column one is fixed on the side wall away from the support block 21 on one end of the support rod two away from the rotating plate 22, the fixed column two is fixed on the side wall away from the support plate one 10 on one end of the fixed rod 25 away from the support block 21, and the outer arc walls of the fixed column one and the fixed column two are sleeved with the same tension spring 24;

[0036] The two ends of the support block 21 away from the support plate one 10 on the side wall of the rotating plate 22 are fixed with the limiting column two 23 along the width direction of the support block 21, the axial direction of the limiting column two 23 is parallel to the length direction of the support block 21, and the support rod two is located on the top of the limiting column two 23; when the support rod two on the outer arc wall of the rotating plate 22 is rotated to the horizontal state, the support rod two abuts against the outer arc wall of the limiting column two 23.

[0037] It should be noted that the support plate one 10 and the support plate four 34 provide support for the support plate three 31, the sliding block two 26 and the support plate two 27 provide support for the turnover mechanism, in the initial state, one of the limiting column one 16 and the inclined surface of the limiting block 14 abut against each other, the rotating plate 22 is in the horizontal state and the support rod one abuts against one of the limiting column two 23, the length direction of the support block 21 is perpendicular to the length direction of the support plate one 10, the rotating plate 22 is located on the side of the support block 21 away from the support plate one 10, two support rods one are arranged on the outer arc wall of the rotating block 15, and the length directions of the two support rods one are respectively consistent with the radial direction of the rotating block 15, the included angle between the two support rods one is obtuse, and the fixed rod 25 is vertically arranged on the bottom of the support block 21;

[0038] When the support block 21 rises, the other limiting column one 16 abuts against the corresponding side of the baffle one 13, at this time, the baffle one 13 is mainly subjected to the force from the vertical direction, so that the sliding block one 11 does not slide relative to the support plate one 10, at this time, the rotating block 15 rotates around the limiting column one 16 abutting against the baffle one 13, at this time, the limiting column one 16 drives the rotating block 15 to rotate in the opposite direction, and the other limiting column one 16 passes between the two baffles one 13;

[0039] The rotating block 15 drives the rotating shaft one 20 to rotate, the rotating shaft one 20 drives the rotating plate 22 to rotate, when the rotating plate 22 rotates more than ninety degrees and overcomes the elastic force of the tension spring 24, the rotating plate 22 drives the support rod one thereon to rotate to the other side and abut against the limiting column two 23 on the other side, at this time, the tension spring 24 is in the stretched state and has the tendency to contract, thereby ensuring that the support plate three 31 cannot be reversed.

[0040] When the support block 21 descends, the limit column one 16 at the bottom end first abuts against the inclined surface of the limit block 14, thereby forcing the fixed frame 12 to slide, thereby ensuring that the next time the limit column one 16 not abutting against the baffle one 13 can pass between the two baffle one 13.

[0041] Please refer to the accompanying Figure 1 to the accompanying Figure 5 The utility model provides a technical scheme: the one side wall of pivot one 20 away from support block 21 is fixed with the support plate three 31 of horizontal arrangement, the center of one side wall of support plate three 31 away from pivot two is fixed with the pivot two of same structure, the one end of pivot two away from support plate three 31 is fixed on sliding block three 33, the one side of sliding block three 33 away from support plate three 31 slides on support plate four 34, the outer arc wall of pivot two is fixed with turntable 32, the outer edge of one side wall of turntable 32 close to support plate three 31 is fixed with motor 35, and the output end of motor 35 is towards support plate three 31 arrangement;

[0042] The one end of motor 35 away from turntable 32 is fixed with lead screw 40, the one end of lead screw 40 away from motor 35 is threaded to support plate three 31, the position of outer arc wall of lead screw 40 corresponding to passageway two is connected with sliding block four 41, and the tooth of the side wall of sliding block four 41 and inner tooth ring 42 close to each other is equipped with tooth, and the tooth of the side wall of sliding block four 41 and inner tooth ring 42 close to each other is engaged.

[0043] Need to be explained: further, sliding block three 33 can be electric sliding block, i. e. the one side wall of support plate four 34 close to sliding block three 33 is equipped with electric sliding platform, and sliding block three 33 is fixed on electric sliding platform, so that when sliding block three 33 moves, support plate three 31 can be driven to trigger the turnover mechanism.

[0044] Please refer to the accompanying Figure 1 to the accompanying Figure 5 The utility model provides a technical scheme: the top and bottom of support plate three 31 are fixedly connected with the baffle two 30 of same structure along the length direction opposite both ends thereof, the longitudinal section of baffle two 30 along the width direction of support plate three 31 is " L " shape, a plurality of equidistant linear distribution, vertical through passageway two are set up on the midline along the length direction of the top of support plate three 31, support plate three 31 is hollow structure, and the passageway two is equipped with clamping mechanism.

[0045] The clamping mechanism arranged in the passage two of the support plate three 31 comprises an inner tooth ring 42 rotatably connected to the inner wall of the bottom of the support plate three 31 at a position corresponding to the passage two, the inner tooth ring 42 is located in the passage two, and a plurality of gear wheels 43 are rotatably connected to the inner side of the inner tooth ring 42 in an annular array along the axial direction of the inner tooth ring 42; the outer side of the gear wheel 43 is rotatably connected with a rack plate 44, the rack plate 44 is located at the top of the inner tooth ring 42, and the length direction of the rack plate 44 is consistent with the radial direction of the inner tooth ring 42;

[0046] The rack plate 44 is fixed with a horizontally arranged push rod 45 on one side wall close to the axis of the inner tooth ring 42, the axial direction of the push rod 45 is consistent with the radial direction of the inner tooth ring 42, a plurality of fixed lug seats 47 are fixed on the inner arc wall of the passage two in an annular array along the axial direction of the inner tooth ring 42, a plurality of the push rods 45 correspond to a plurality of the fixed lug seats 47 one by one, the fixed lug seat 47 rotatably connected with a limiting clamp 46 on the side away from the inner arc wall of the passage two, and one end of the push rod 45 away from the rack plate 44 penetrates through the inner arc wall of the passage two and is rotatably connected with the limiting clamp 46.

[0047] It should be noted that the baffle two 30 is used for intercepting the plastic cups transmitted from the transmission belt one, and the plastic cups intercepted by the baffle two 30 can better fall into the passage two;

[0048] The rotation of the inner tooth ring 42 will drive the gear wheel 43 to rotate, the gear wheel 43 is located in the inside of the support plate three 31 and does not penetrate through the passage two, the gear wheel 43 rotates on the inner wall of the bottom of the support plate three 31, the axial length of the gear wheel 43 is greater than the axial length of the inner tooth ring 42, the gear wheel 43 engages with the rack plate 44 to drive a plurality of the rack plates 44 to move synchronously towards the center, and then drive the push rod 45 to move;

[0049] The length direction of the limiting clamp 46 is parallel to the axial direction of the inner tooth ring 42, both ends of the limiting clamp 46 are made of flexible material, the radial longitudinal section of the limiting clamp 46 along the inner tooth ring 42 is in the shape of “V”, the middle part of the limiting clamp 46 is rotatably connected with the fixed lug seat 47 and the recess of the limiting clamp 46 is arranged away from the inner arc wall of the passage two, and both ends of the limiting clamp 46 respectively extend out of the passage two.

[0050] Then the rotation of the motor 35 and the screw rod 40 will drive the sliding block four 41 to move along the axial direction of the screw rod 40, then the inner tooth ring 42 is driven to rotate, and then the clamping mechanism is driven to rotate, when the push rod 45 extends, the end of the limiting clamp 46 close to the push rod 45 will shrink towards the axis of the passage two, the other end of the limiting clamp 46 will move away from the axis of the passage two, and then the plastic cup on this side is clamped, when the turnover mechanism drives the support plate three 31 to turn over, the circulation operation is realized.

[0051] Working principle:

[0052] The baffle two 30 is used for intercepting the plastic cup transmitted from the conveying belt one, and the plastic cup intercepted by the baffle two 30 can better fall in the channel two;

[0053] The rotation of the motor 35 and the lead screw 40 drives the slider four 41 to move axially along the lead screw 40, and then the inner tooth ring 42 rotates, the rotation of the inner tooth ring 42 drives the gear 43 to rotate, the gear 43 is located in the support plate three 31 and does not pass through the channel two, the gear 43 rotates on the inner wall at the bottom of the support plate three 31, the axial length of the gear 43 is greater than the axial length of the inner tooth ring 42, the gear 43 engages the rack plate 44 to drive the plurality of rack plates 44 to move synchronously and centripetally, and then the push rod 45 is pushed, when the push rod 45 is extended, the end of the limiting clamp 46 close to the push rod 45 is retracted towards the axis of the channel two, the other end of the limiting clamp 46 moves away from the axis of the channel two, and then the plastic cup on the side is clamped, when the turnover mechanism turns over the support plate three 31, the circulation operation is realized.

Claims

1. A pre-inverting mechanism suitable for the stacking and packaging of plastic cups, comprising a support plate one (10), a support plate two (27) and a support plate four (34), wherein a slider one (11) is slidably mounted on the top of the support plate one (10), and a slider two (26) is slidably mounted on a side wall of the support plate two (27), characterized in that: The slider one (11) is provided with a flipping mechanism on the side away from the support plate one (10), the flipping mechanism including: The fixed frame (12) is fixedly connected to the top of the slider (11). The longitudinal section of the fixed frame (12) along the length of the support plate (10) is "door" shaped and the opening is set away from the support plate (10). The top of the inner sidewalls of the fixed frame (12) that are close to each other are fixed with horizontally set baffles (13). The middle of the inner sidewall of the fixed frame (12) close to the support plate (10) is fixed with a limit block (14). The support block (21) is fixed on the slider two (26). The slider two (26) and the support plate two (27) are both located on the same side of the support plate one (10). The support block (21) has a channel one through the length direction of the support block (21) at the center of a horizontal side wall near the support plate one (10). A rotating shaft one (20) is rotatably provided in the channel one. A rotating plate (22) is fixed to the end of the rotating shaft (20) away from the support plate (10). A rotating block (15) is fixedly connected to the end of the outer arc wall of the rotating shaft (20) near the fixed frame (12). A fixed rod (25) is fixed to the middle of the bottom of the support block (21) away from the support plate (31). The same tension spring (24) is sleeved on the end of the rotating plate (22) away from the axis of the rotating shaft (20) and the end of the fixed rod (25) away from the support block (21).

2. A pre-inverting mechanism suitable for use in a stack packaging of plastic cups as claimed in claim 1, characterized in that: A support rod is fixed on the outer arc wall of the rotating block (15). A limit post (16) is fixed at one end of the support rod away from the rotating block (15). The limit post (16) is set away from the support block (21) and its axial direction is parallel to the width direction of the support plate (10). The longitudinal section of the limit block (14) along the length direction of the support plate (10) is an isosceles triangle and its tip is set away from the support plate (10).

3. A pre-inverting mechanism suitable for use in a stack packaging of plastic cups as claimed in claim 2, characterized in that: The limiting post 1 (16) is fixed on the side wall of the support rod 1 away from the rotating block (15) and away from the rotating shaft 1 (20). The support rod 2 is fixed on the outer arc wall of the rotating plate (22). The length direction of the support rod 2 is consistent with the radial direction of the rotating plate (22). The fixing post 1 is fixed on the side wall of the support rod 2 away from the rotating plate (22) and away from the support block (21). The fixing post 2 is fixed on the side wall of the fixing rod (25) away from the support block (21) and away from the support plate 1 (10). The same tension spring (24) is sleeved on the outer arc wall of the fixing post 1 and the fixing post 2.

4. A pre-inverting mechanism for use in a stack packaging of plastic cups as claimed in claim 1, characterized in that: On the side wall of the support block (21) away from the support plate (10), at both ends of the support block (21) along the width direction outside the rotating plate (22), there are two limiting posts (23). The axial direction of the limiting posts (23) is parallel to the length direction of the support block (21). The second support rod is located at the top of the second limiting post (23). When the second support rod on the outer arc wall of the rotating plate (22) rotates to a horizontal state, the second support rod abuts against the outer arc wall of the second limiting post (23).

5. A pre-inverting mechanism for use in a stack packaging of plastic cups as claimed in claim 1, characterized in that: A horizontally arranged support plate three (31) is fixed on the side wall of the rotating shaft one (20) away from the support block (21). A rotating shaft two with the same structure is fixed at the center of the side wall of the support plate three (31) away from the rotating shaft one (20). One end of the rotating shaft two away from the support plate three (31) is fixed on the slider three (33). The side of the slider three (33) away from the support plate three (31) slides on the support plate four (34). A turntable (32) is fixed on the outer arc wall of the rotating shaft two. A motor (35) is fixed on the outer edge of the side wall of the turntable (32) near the support plate three (31). The output end of the motor (35) is set towards the support plate three (31).

6. The pre-flipping mechanism for stacked packaging of plastic cups as described in claim 5, characterized in that: The top and bottom of the support plate three (31) are respectively fixedly connected to the opposite ends of the length direction of the support plate three (31) with the same structure. The longitudinal section of the baffle two (30) along the width direction of the support plate three (31) is "L" shaped. Several vertically penetrating channels two are linearly distributed at equal intervals along the center line of the length direction of the top of the support plate three (31). The support plate three (31) is a hollow structure and a clamping mechanism is provided in the channel two.

7. The pre-flipping mechanism for stacked packaging of plastic cups as described in claim 6, characterized in that: The clamping mechanism located in the channel 2 on the support plate 3 (31) includes an internal gear ring (42) rotatably connected to the inner wall of the bottom of the support plate 3 (31) at a position corresponding to the channel 2. The internal gear ring (42) is located in the channel 2. A plurality of gears (43) are meshed on the inner side of the internal gear ring (42) in a ring array about the axial direction of the internal gear ring (42). A rack plate (44) is meshed on the outer side of the gears (43). The rack plate (44) is located on the top of the internal gear ring (42) and the length direction of the rack plate (44) is consistent with the radial direction of the internal gear ring (42).

8. The pre-flipping mechanism for stacked packaging of plastic cups as described in claim 7, characterized in that: A horizontally arranged push rod (45) is fixed on one side wall of the rack plate (44) near the axis of the inner toothed ring (42). The axial direction of the push rod (45) is consistent with the radial direction of the inner toothed ring (42). Several fixed ear seats (47) are fixed on the inner arc wall of the channel two in a ring array about the axial direction of the inner toothed ring (42). Several push rods (45) correspond one-to-one with several fixed ear seats (47). The side of the fixed ear seat (47) away from the inner arc wall of the channel two is rotatably connected to a limit clamp (46). The end of the push rod (45) away from the rack plate (44) passes through the inner arc wall of the channel two and is rotatably connected to the limit clamp (46).

9. The pre-flipping mechanism for stacked packaging of plastic cups as described in claim 5, characterized in that: The motor (35) is fixed with a lead screw (40) at one end away from the turntable (32). The end of the lead screw (40) away from the motor (35) passes through the support plate three (31). A slider four (41) is threadedly connected to the outer arc wall of the lead screw (40) at the position corresponding to the channel two. The side walls of the slider four (41) and the inner toothed ring (42) that are close to each other are provided with teeth. The teeth on the side walls of the slider four (41) and the inner toothed ring (42) that are close to each other mesh with each other.

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