Tube cover for paste packaging tube

Abstract

The present invention discloses a tube cover for a paste packaging tube, comprising: a third cover body, the rear end of the third cover body is detachably connected to the tube body of the paste packaging tube; a second cover body, the rear end of the second cover body is connected to the front end of the third cover body and cooperates to realize the locking of the tube cover; a first cover body, the rear end of the first cover body is connected to the front end of the second cover body; when the paste packaging tube is squeezed, the paste enters the first cover body from the paste packaging tube through the third cover body and the second cover body in sequence, the paste is squeezed out through the lower end of the first cover body, and the first cover body realizes the reset of the tube cover after the paste is squeezed out. The present invention realizes the function of the tube cover automatically rebounding to the original angle position after the paste is squeezed out, and the opening and closing of the tube cover is completed in one step without redundant actions and steps; at the same time, during use, it perfectly fits the angle of the human body holding the tube body, and there is no need to adjust the hand or arm to complete the extrusion action, and the paste can be squeezed out with one hand, which is convenient to operate and use.

Description

Technical Field

[0001] The invention relates to a tube cover for a paste packaging tube, belonging to the technical field of packaging. Background Art

[0002] In our daily life, we use a lot of paste products in tube packaging, such as toothpaste, skin cream, ointment, etc. When using, we squeeze the packaging tube manually to squeeze out the paste from the outlet of the tube head. Due to the different opening and closing methods of the packaging tube, we often need to manually break open the buckle cover of the tube or rotate the knob cover before squeezing out, and then repeat the action to lock it after completion.

[0003] At present, the tube caps of packaging tubes include buckle caps, knob caps, push caps, etc., each of which has its own shortcomings in actual use. For example, each opening and closing of the buckle cap and the knob cap must be opened and closed separately, and requires the cooperation of two hands. If the tube cap is not closed after use, the paste may be contaminated or flow out or overflow. Although the push cap is easy to use, it has a complex structure and many components. It also requires elastic metal other than plastic as a restoring force, which has a high manufacturing cost and is not conducive to promotion and popularization. In addition, the paste outlet of the push cap cannot be locked, which causes the paste to be contaminated or flow out, and is prone to leakage when carried out.

[0004] There is a patent for a new type of toothpaste cap with automatic toothpaste squeezing function (CN202010761250.2), which includes a toothpaste tube, a toothpaste rack, a toothpaste inlet base, an extrusion mechanism, a toothpaste outlet base and a toothpaste cap. The toothpaste rack is sleeved on the outlet end of the toothpaste tube, and the lower part of the toothpaste inlet base is provided with a paste inlet, and the inner surface of the paste inlet is threadedly connected to the outlet end of the toothpaste tube by opening a thread. The toothpaste cap is mainly composed of springs and other metal parts and plastic structures, so the manufacturing cost is high, which is not conducive to mass production of enterprises, and the overall structure is not simple and beautiful, and it is not easy to carry out. It is essentially no different from traditional press-type products, and the significance of mass production is not great. Summary of the invention

[0005] In view of the problems existing in the above-mentioned prior art, the present invention provides a tube cover for a paste packaging tube, which can complete the extrusion of the paste with one hand, effectively avoiding contamination, outflow or overflow of the paste, has a simple structure, low cost, and is easy to promote and apply.

[0006] In order to achieve the above object, the present invention adopts a tube cover for a paste packaging tube, comprising:

[0007] a third cover body, the rear end of which is detachably connected to the tube body of the paste packaging tube;

[0008] A second cover body, wherein the rear end of the second cover body is connected to the front end of the third cover body and cooperates with each other to realize the locking of the pipe cover;

[0009] a first cover body, wherein a rear end of the first cover body is connected to a front end of the second cover body;

[0010] When the paste packaging tube is squeezed, the paste passes through the third cover body and the second cover body in sequence from the paste packaging tube into the first cover body, and the paste is squeezed out through the lower end of the first cover body. The first cover body realizes the reset of the tube cover after the paste is squeezed out.

[0011] As an improvement, the second cover body and the third cover body, and the first cover body and the second cover body are all connected in a detachable manner.

[0012] As an improvement, the first cover body includes a front overflow prevention plate, an upper limit block, two outer overflow prevention plates, two arc-shaped overflow prevention plates, and a reset mechanism;

[0013] The upper limit block is installed at one end of the front overflow plate, and two outer overflow plates and two arc overflow plates are respectively installed on the front overflow plate, one end of each outer overflow plate is close to the upper limit block, and the other end is connected to a arc overflow plate, and the reset mechanism is installed on the front overflow plate.

[0014] As an improvement, the front overflow anti-plate is a circular plate with a cross-section provided at one end, and the arc-shaped overflow anti-plate is connected to the cross-section of the front overflow anti-plate.

[0015] As an improvement, the second cover body includes an outer plate 1, and the inner part of the outer plate 1 is provided with a locking overflow-limiting block 1, an extrusion hole 1 connected to the first cover body, an upper limit block installation groove and a limit overflow-blocking plate;

[0016] A horizontal limit overflow plate and two inner overflow plates are provided in front of the locking overflow-limiting block 1, and the inner overflow plate is installed between the horizontal limit overflow plate and the limit overflow plate;

[0017] A middle annular overflow prevention plate and a connecting slot are provided on the outer side of the locking overflow limiting block 1.

[0018] As an improvement, a semi-annular groove is provided on the outer plate near the upper limit block mounting groove.

[0019] As an improvement, an annular groove for connecting to the third cover body is provided on the inner side of the outer plate close to the connecting slot; and a plurality of limiting columns are provided on the inner side of the middle annular overflow prevention plate.

[0020] As an improvement, the third cover body includes an outer plate 2, the front end of which is evenly distributed with a number of blocks for connecting to the second cover body, an outer annular channel overflow plate and an inner annular channel overflow plate are installed on the inner side of the blocks, and the inner side of the inner annular channel overflow plate is provided with a locking overflow limit block 2 and an extrusion hole 2 connected to the second cover body.

[0021] As an improvement, the third cover body is connected to the tube body of the paste packaging tube via a connecting thread.

[0022] As an improvement, a marking block 1 is provided on the second cover body, and a marking block 2 is provided on the third cover body. The marking block 1 and the marking block 2 are used to cooperate to indicate whether the tube cover is in use or locked state.

[0023] Compared with the prior art, the tube cover for the paste packaging tube of the present invention has the following beneficial effects:

[0024] 1) The function of the tube cover automatically rebounding to the original angle position after the paste is squeezed out is realized, and the opening and closing of the tube cover is completed in one step without the need for extra actions and steps; at the same time, during use, it perfectly fits the angle of the human hand holding the tube body, and there is no need to adjust the hand or arm to complete the extrusion action. The paste can be squeezed out with one hand, which is convenient to operate and use.

[0025] 2) Small size, easy to carry, and the extrusion port of the tube cover does not come into contact with the air environment, effectively avoiding contamination, outflow, or overflow of the paste.

[0026] 3) It is easy to process, low in cost, can be mass-produced on a large scale, and has complete functions. It has all the advantages of existing products on the market and effectively overcomes the defects of various extruder heads. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 It is a structural schematic diagram of the present invention;

[0028] Figure 2 The decomposition structure of the present invention Figure 1 ;

[0029] Figure 3 The decomposition structure of the present invention Figure 2 ;

[0030] Figure 4 It is a schematic diagram of the use state of the present invention;

[0031] Figure 5 The three-dimensional structure of the first cover of the present invention is shown in FIG. Figure 1 ;

[0032] Figure 6 The three-dimensional structure of the first cover of the present invention is shown in FIG. Figure 2 ;

[0033] Figure 7 is a side view of the first cover of the present invention;

[0034] Figure 8 is a side view of the second cover of the present invention;

[0035] Fig. 9 The three-dimensional structure of the second cover of the present invention is shown in FIG. Figure 1 ;

[0036] Fig.10 The three-dimensional structure of the second cover of the present invention is shown in FIG. Figure 2 ;

[0037] Fig.11 is a partial cross-sectional view of the second cover of the present invention;

[0038] Fig.12 The three-dimensional structure of the third cover of the present invention is shown in FIG. Figure 1 ;

[0039] Fig.13 The three-dimensional structure of the third cover of the present invention is shown in FIG. Figure 2 ;

[0040] Fig.14 is a partial cross-sectional view of a third cover body of the present invention;

[0041] Fig.15 Another structural schematic diagram of the reset mechanism of the present invention;

[0042] Fig.16 Another structural schematic diagram of the reset mechanism of the present invention;

[0043] Fig.17 Another structural schematic diagram of the reset mechanism of the present invention;

[0044] Fig.18 Another structural schematic diagram of the reset mechanism of the present invention;

[0045] In the figure: 100, first cover body, 101, front overflow plate, 102, upper limit block, 103, outer overflow plate, 104, arc overflow plate, 105, return member, 106, elastic member, 107, elastic return member, 108, arc elastic member, 109, spring member, 200, second cover body, 201, outer plate 1, 202, connecting slot, 203, middle annular overflow plate, 204, limit column, 205, locking overflow limit block 1, 206, limit overflow plate, 207, extrusion hole 1, 208, marking block 1, 209, arc surface, 210, inner overflow plate, 211, horizontal limit overflow plate, 212, upper limit block mounting groove, 213, middle limit block, 214, semi-annular groove, 300, third cover body, 301, outer plate 2, 302, outer annular channel overflow plate, 303, inner annular channel overflow plate, 304, limit groove, 305, clamping block, 306, marking block 2, 307, locking overflow limit block 2, 308, extrusion hole 2, 309, connecting thread. DETAILED DESCRIPTION

[0046] To make the purpose, technical solution and advantages of the present invention more clear, the present invention is further described in detail below. However, it should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the scope of the present invention.

[0047] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by technicians in the technical field to which the present invention belongs. The terms used in the specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention.

[0048] In addition, the following Figure 2 , Figure 3 The description is based on the direction indicated by the coordinates in the figure. Of course, the terms indicating the direction or position relationship, such as "upper", "lower", "front" and "back", are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction. Therefore, they should not be understood as limiting the present invention.

[0049] like Figure 1 , Figure 2 , Figure 3 and Figure 4 As shown, a tube cover for a paste packaging tube, the tube cover comprises:

[0050] A third cover body 300, the rear end of which is detachably connected to the tube body of the paste packaging tube;

[0051] A second cover body 200, wherein the rear end of the second cover body 200 is connected to the front end of the third cover body 300 and cooperates to achieve the locking of the pipe cover;

[0052] A first cover body 100, wherein a rear end of the first cover body 100 is connected to a front end of the second cover body 200;

[0053] When the paste packaging tube is squeezed, the paste passes through the third cover 300 and the second cover 200 from the paste packaging tube in sequence and enters the first cover 100. The paste is squeezed out through the lower end of the first cover 100. The first cover 100 resets the tube cover after the paste is squeezed out.

[0054] The first cover body 100 in the present invention is the main part that generates restoring force to realize the opening and closing of the pipe cover. In the actual product, the first cover body 100 and the second cover body 200 are interlocked and connected as a whole or directly processed and formed as a whole without separation; the front end of the second cover body 200 is connected to the first cover body 100, and the rear end is buckled or clamped together with the third cover body 300, and the second cover body 200 and the third cover body 300 can rotate with each other to realize the locking function of the pipe cover.

[0055] As an improvement of the embodiment, Figure 5 , Figure 6 and Figure 7As shown, the first cover body 100 includes a front overflow prevention plate 101, an upper limit block 102, two outer overflow prevention plates 103, two arc-shaped overflow prevention plates 104, and a reset mechanism;

[0056] The reset mechanism is used to control the first cover body 100 to reset the tube cover after the paste is extruded. The specific structure and installation position of the reset mechanism can be flexibly designed according to needs.

[0057] The upper limit block 102 is installed at one end of the front overflow plate 101 through a return member 105 (a structural embodiment of the reset mechanism), and two outer overflow plates 103 and two arc-shaped overflow plates 104 are respectively installed on the front overflow plate 101, and one end of each outer overflow plate 103 is close to the upper limit block 102, and the other end is connected to an arc-shaped overflow plate 104. The return member 105 uses the property characteristics of the material itself to play a rebound role. When the lower part of the current overflow plate 101 is bent outward by the extrusion force of the paste, after the extrusion force is removed, the return member 105 can rebound the front overflow plate 101 to the original angle position. The material used for the return member 105 is a material with high toughness, high durability and restoring force. The mainstream materials that are currently available on the market and have high cost performance and mass production include plastics (such as single material PP, mixed material ABS+PC) and elastic metals (such as manganese steel).

[0058] When the return member 105 is not provided, a spring member 109 (such as Fig.18 As shown), the spring member 109 is installed on the front overflow plate 101; or, an elastic member 106 arranged in an inclined manner is provided on the upper limit block 102 (as shown Fig.15 Alternatively, an arc-shaped elastic member 108 (such as Fig.17 As shown), the spring member 109 or the elastic member 106 or the arc-shaped elastic member 108 provides a restoring force for the first cover 100; in addition, as Fig.16 As shown, an elastic restoring member 107 integrally formed with the front overflow plate 101 may also be provided on one side of the front overflow plate 101 close to the upper limit block 102. When this structure is adopted, the upper limit block 102 is directly mounted on the front overflow plate 101. The materials of the spring member 109, the elastic member 106, the arc-shaped elastic member 108 and the elastic restoring member 107 may refer to the material of the restoring member 105.

[0059] As an improvement of the embodiment, the front anti-overflow plate 101 is a circular plate with a cross section at one end, and the arc-shaped anti-overflow plate 104 fits the cross section of the front anti-overflow plate 101. The front to rear of the arc-shaped anti-overflow plate 104 is designed as an arc surface, and the frontmost part of the arc surface is straight. According to the product entity test, when the paste is squeezed out, the lower part of the front anti-overflow plate 101 bends outward (such as Figure 4 As shown in the figure, the arc surface of the arc-shaped overflow prevention plate 104 can be well extended with the arc surface and angle of the horizontal limit overflow prevention plate 211, so that the paste can be wiped clean once and for all without any residue after being squeezed out. Among them, the middle part of the horizontal limit overflow prevention plate 211 is an arc surface, which fits tightly with the arc surface of the arc-shaped overflow prevention plate 104. The arc surface design of this part is the same as the action arc surface generated when the front overflow prevention plate 101 bends outward, which prevents the paste from overflowing from the bottom during the extrusion process; the front top surface of the horizontal limit overflow prevention plate 211 is horizontally designed, which fits tightly with the straight design of the lower part of the front overflow prevention plate 101, which prevents the paste from overflowing in the static closed state. At the same time, when the return member 105 is in contact with the front overflow prevention plate 101, the return member 105 is in contact with the front overflow prevention plate 101. When the connection of the overflow plate 101 is fixed and the center of the circular motion of the front overflow plate 101 is on the inner side of the front overflow plate 101, the circular motion trajectory of the outer side of the front overflow plate 101 is larger than the circular motion trajectory of the inner side of the front overflow plate 101 due to the straight design of the front overflow plate 101. Therefore, when an external force causes the lower part of the front overflow plate 101 to be squeezed and deformed inwardly, it will be hindered by the horizontal front top surface of the horizontal limit overflow plate 211, thereby limiting the inward deformation of the front overflow plate 101.

[0060] As an improvement of the embodiment, Figure 8 , Fig. 9 , Fig.10 and Fig.11 As shown, the second cover body 200 includes an outer plate 201, and a locking overflow-limiting block 205, an extrusion hole 207 connected to the first cover body 100, an upper limit block installation groove 212 and a limit overflow-blocking plate 206 are provided in the middle of the inner side of the outer plate 201;

[0061] A horizontal limit overflow plate 211 and two inner overflow plates 210 are provided in front of the locking overflow limit block 205, and the inner overflow plate 210 is installed between the horizontal limit overflow plate 211 and the limit overflow plate 206;

[0062] A middle annular overflow prevention plate 203 and a connecting slot 202 are provided on the outer side of the locking overflow limiting block 205 .

[0063] The outer overflow prevention plate 103 of the first cover 100 fits tightly with the inner overflow prevention plate 210 of the second cover 200 to prevent the paste from overflowing from both sides during the extrusion process; the arc-shaped overflow prevention plate 104 fits tightly with the horizontal limit overflow prevention plate 211 with a certain curvature in the middle to prevent the paste from overflowing from the bottom during the extrusion process. Figure 4 As shown), a rectangular channel is formed by the cooperation of the front overflow plate 101, the outer overflow plate 103, the arc overflow plate 104, the inner overflow plate 210 and the horizontal limit overflow plate 211, which is the extrusion outlet of the paste.

[0064] The upper limit block 102 of the first cover 100 is installed in cooperation with the upper limit block installation groove 212 of the second cover 200. In the actual product, if the first cover 100 and the second cover 200 are formed as one piece, the upper limit block 102 is processed as one piece with the middle limit block 213 and the limit overflow plate 206. At the same time, the front end of the upper limit block 102 and the front end of the middle limit block 213 form a surface together, which limits the angle of the upper part of the front overflow plate 101 to bend inward when it is squeezed (see Figure 4 ), thereby ensuring that the paste passes through a consistent caliber when extruded, and preventing the problem of an extrusion cross-section being too large.

[0065] As an improvement of the embodiment, a semi-circular groove 214 is provided on the peripheral plate 1 201 near the upper limit block mounting groove 212. When the upper portion of the front overflow plate 101 is bent by the extrusion force, the semi-circular groove 214 can ensure that the upper portion of the front overflow plate 101 moves without obstruction.

[0066] As an improvement of the embodiment, a curved surface 209 is provided on the second cover body 200. During the actual extrusion operation of the product, the curved design of the curved surface 209 fits the posture and angle of the hand or arm, and there is no need to change the angle of the hand when squeezing the packaging tube. The extrusion action can be perfectly fitted with the load-bearing contact surface (the load-bearing contact surface, such as the load-bearing receiving surface of various brush heads, hands, etc. after the paste is squeezed out) to complete the extrusion action.

[0067] As an improvement of the embodiment, an annular groove for connecting the third cover body 300 is provided on the inner side of the outer plate 1 201 near the connecting slot 202. When the block 305 is inserted into the annular groove, the second cover body 200 and the third cover body 300 are tightly fitted. At the same time, the connecting slot 202 and the block 305 are both annular in design, which ensures that the locking movement of circular rotation is smoothly completed. A protrusion is provided on the block 305. When the second cover body 200 is connected to the third cover body 300, the protrusion of the block 305 will tilt inward at a certain angle. When the second cover body 200 and the third cover body 300 are fully connected, the protrusion will rebound to the original angle position, so that the block 305 is tightly buckled with the annular groove ring surface of the connecting slot 202 to achieve connection. At the same time, the block 305 is a multi-point design, which increases the locking limit force after tightening and avoids the situation where a gap is generated due to a loose connection and causes overflow; a plurality of limit columns 204 are provided on the inner side of the middle annular overflow prevention plate 203. Preferably, four limit columns 204 are arranged at equal intervals on the circumference, and correspondingly, four limit grooves 304 are opened in the inner annular channel overflow prevention plate 303 of the third cover body 300. The limit columns 204 are engaged with the limit grooves 304 (at this time, the middle annular overflow prevention plate 203 is installed between the inner annular channel overflow prevention plate 303 and the outer annular channel overflow prevention plate 302). When in the normal use position, the second cover body 200 and the third cover body 300 are connected to the inner wall of the extrusion channel in a consistent and smooth manner, and can also be limited to the correct rotation angle position when locked.

[0068] As an improvement of the embodiment, Fig.12 , Fig.13 and Fig.14 As shown, the third cover body 300 includes an outer plate 2 301, and a plurality of blocks 305 for connecting the second cover body 200 are evenly distributed on the front end of the outer plate 201. An outer annular channel overflow plate 302 and an inner annular channel overflow plate 303 are installed on the inner side of the block 305. The inner side of the inner annular channel overflow plate 303 is provided with a locking overflow limit block 2 307 and an extrusion hole 2 308 connected to the second cover body 200.

[0069] The outer peripheral plate 1 201 of the second cover body 200 and the outer peripheral plate 2 301 of the third cover body 300 have the same size, thus ensuring the overall aesthetics of the pipe cover.

[0070] The inner annular channel overflow plate 303 is connected to the middle annular channel overflow plate 203 (at this time, the middle annular channel overflow plate 203 is installed between the inner annular channel overflow plate 303 and the outer annular channel overflow plate 302). When the second cover 200 performs a circular rotation on the third cover 300, the annular design ensures smooth movement. When the second cover 200 is connected to the third cover 300, the outer annular channel overflow plate 302 and the annular gap of the middle annular overflow plate 203 are attached to each other to form a second layer of overflow ring, which prevents the paste from overflowing at the connection during the process of squeezing the paste.

[0071] When in use or on, the locking overflow limit block 205 overlaps with the locking overflow limit block 2 307, and the extrusion hole 207 is connected to the extrusion hole 2 308 to form a semicircular paste extrusion channel, which can ensure the passage of the paste (after testing the actual product, when the paste passes through the semicircular paste extrusion channel, the extrusion force is almost the same as the extrusion force when there is no locking overflow limit block in the extrusion channel); when the product is locked, after a 180-degree rotation, the locking overflow limit block 205 and the locking overflow limit block 2 307 form a circular baffle that fits tightly front and back. At this time, the extrusion channel of the paste is completely blocked, and when the packaging tube is squeezed by external force, it is guaranteed that the paste does not overflow, thereby achieving a completely locked state of the product.

[0072] In addition, the second cover body 200 is provided with a marking block 1 208, and the third cover body 300 is provided with a marking block 2 306. The marking block 1 208 and the marking block 2 306 are used to cooperate to indicate whether the tube cover is in a use state or a locked state. When the marking block 1 208 is aligned with the marking block 2 306, the tube cover is in an unlocked state and can be used normally. If the marking block 1 208 and the marking block 2 306 are in a diagonal position, the tube cover is in a locked state.

[0073] As an improvement of the embodiment, the third cover body 300 is connected to the tube body of the paste packaging tube via a connecting thread 309, which is convenient for assembly and disassembly.

[0074] The tube cover for the paste packaging tube of the present invention realizes the function of the tube cover automatically rebounding to the original angle position after the paste is extruded, and the opening and closing of the tube cover is completed in one step without the need for extra actions and steps; at the same time, during use, it perfectly fits the angle of the tube body held by the human body, and there is no need to adjust the hand or arm to complete the extrusion action, and the paste can be extruded with one hand, which is convenient to operate and use; the tube cover is small in size and easy to carry, and the extrusion port of the tube cover does not contact the air environment, effectively avoiding contamination or outflow and overflow of the paste; it is easy to process, low in cost, can be mass-produced on a large scale, and has complete functions. It has all the advantages of existing products on the market and effectively overcomes the defects of various extrusion heads.

[0075] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modification, equivalent substitution or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A tube cover for a paste packaging tube, characterized in that: The tube cover comprises: A third cover body (300), the rear end of the third cover body (300) being detachably connected to the tube body of the paste packaging tube; A second cover body (200), wherein the rear end of the second cover body (200) is connected to the front end of the third cover body (300) and cooperates to achieve pipe cover locking; A first cover body (100), wherein a rear end of the first cover body (100) is connected to a front end of the second cover body (200); The first cover body (100) comprises a front overflow prevention plate (101), an upper limit block (102), two outer overflow prevention plates (103), two arc-shaped overflow prevention plates (104), and a reset mechanism; the upper limit block (102) is mounted on one end of the front overflow prevention plate (101); the two outer overflow prevention plates (103) and the two arc-shaped overflow prevention plates (104) are respectively mounted on the front overflow prevention plate (101); one end of each outer overflow prevention plate (103) is close to the upper limit block (102), and the other end is connected to one of the arc-shaped overflow prevention plates (104); the reset mechanism is mounted on the front overflow prevention plate (101); the front overflow prevention plate (101) is a circular plate with a cross-section at one end; and the arc-shaped overflow prevention plate (104) is connected to the cross-section of the front overflow prevention plate (101); The second cover body (200) comprises an outer plate (201), wherein the outer plate (201) is provided with a locking overflow limiting block (205), an extrusion hole (207) connected to the first cover body (100), an upper limit block mounting groove (212) and a limit overflow blocking plate (206); a horizontal limit overflow blocking plate (211) and two inner overflow blocking plates (210) are provided in front of the locking overflow limiting block (205), wherein the inner overflow blocking plates (210) are installed between the horizontal limit overflow blocking plate (211) and the limit overflow blocking plates (206); and a middle annular overflow blocking plate (203) and a connecting slot (202) are provided on the outer side of the locking overflow limiting block (205); When the paste packaging tube is squeezed, the paste passes through the third cover body (300), the second cover body (200) and enters the first cover body (100) from the paste packaging tube in sequence, and the paste is squeezed out through the lower end of the first cover body (100). The first cover body (100) resets the tube cover after the paste is squeezed out.

2. The tube cover for a paste packaging tube according to claim 1, characterized in that: The second cover body (200) and the third cover body (300), and the first cover body (100) and the second cover body (200) are all connected in a detachable manner.

3. The tube cover for a paste packaging tube according to claim 1, characterized in that: A semi-annular groove (214) is formed on the outer plate 1 (201) at a position close to the upper limit block mounting groove (212).

4. A tube cover for a paste packaging tube according to claim 1 or 3, characterized in that: An annular groove for connecting to the third cover body (300) is provided on the inner side of the outer plate 1 (201) close to the connecting slot (202); and a plurality of limiting columns (204) are provided on the inner side of the middle annular overflow prevention plate (203).

5. The tube cover for a paste packaging tube according to claim 1, characterized in that: The third cover body (300) comprises a second outer plate (301), a front end of which is evenly distributed with a plurality of clamping blocks (305) for connecting to the second cover body (200), an outer annular channel overflow prevention plate (302) and an inner annular channel overflow prevention plate (303) being installed on the inner side of the clamping blocks (305), and a second locking overflow prevention block (307) and a second extrusion hole (308) communicating with the second cover body (200) being provided on the inner side of the inner annular channel overflow prevention plate (303).

6. The tube cover for a paste packaging tube according to claim 5, characterized in that: The third cover body (300) is connected to the tube body of the paste packaging tube via a connecting thread (309).

7. The tube cover for a paste packaging tube according to claim 1, characterized in that: The second cover body (200) is provided with a marking block 1 (208), and the third cover body (300) is provided with a marking block 2 (306). The marking block 1 (208) and the marking block 2 (306) are used to cooperate to indicate whether the tube cover is in a use state or a locked state.

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