Sliding sleeve replacement tool and packaging machine lifter

Abstract

The utility model relates to the technical field of cigarette manufacturing, and discloses a sliding sleeve replacement tool and a packaging machine lifter, a small rocker arm structure is redesigned and can be used as a sliding sleeve mounting base body to apply the sliding sleeve replacement tool, an inner cavity of a sliding sleeve is used as a placing hole and embedded in a sliding sleeve mounting groove, and a sliding connection hole is formed in the bottom of the groove; the ejection head is inserted into the sliding connection hole, and at least part of the ejection head abuts against the sliding sleeve; the mounting part of the tool base is detachably connected with the sliding sleeve mounting base body, and the supporting part and the sliding sleeve mounting base body are arranged in a spaced mode and provided with threaded holes. The problem that the use cost is too high due to the fact that overall replacement is needed after local abrasion occurs is solved, overall replacement of the small rocker arm is avoided, local replacement is facilitated, more labor is saved, the maintenance cost is saved, the operation difficulty is simplified, and the service life of the sliding sleeve is prolonged. On the premise that the small rocker arm is not detached, operation can be directly carried out on equipment, and the working efficiency of the lifter of the packaging machine is improved.

Description

Technical Field

[0001] This utility model relates to the field of cigarette manufacturing technology, and in particular to a sliding sleeve replacement tool and a packaging machine lifter. Background Technology

[0002] In cigarette production, cigarette box packaging is a crucial process that requires the use of packaging machines. The function of the packaging machine's lifter is generally to raise the packaged cigarette packs or cartons along with a single sheet of transparent paper with a pull string. During this lifting process, the transparent paper is wrapped in an inverted "U" shape on the surface of the cigarette box and raised to a position flush with the next packaging channel. Then, the transparent paper folding plate and the cigarette pusher plate push the cigarette packs or cartons with the transparent paper to the right.

[0003] During the production process of packaging machines, unexpected factors often result in cigarette cartons or packs not being properly wrapped with their outer label paper. These cigarette cartons or packs will then become clogged when pushed to the elevator and lifted during operation. For example... Figure 1 As shown, to prevent the elevator from malfunctioning due to blockage and potentially damaging the machine, an overload protection device 300 is added to the elevator. The existing overload protection device 300 consists of an overload elastic plate 320 and an overload slip ball 310. The overload elastic plate 320, through a connector, presses the overload slip ball 310 into the placement hole 221 of the small rocker arm 200, which is responsible for effective work, after passing through the large rocker arm 100. When blockage occurs at the elevator, causing machine overload, the overload slip ball 310 will disengage from the placement hole 221 of the small rocker arm 200, overcoming the pressure of the overload elastic plate 320 and moving outward. At this time, the combination of the small rocker arm 200 and the large rocker arm 100 will disengage, and the elevator can continue its reciprocating mechanical action. The large rocker arm 100 will also continue to swing, but the small rocker arm 200 will no longer swing with the large rocker arm 100. The elevator will no longer perform effective work, and the blockage will no longer result in lifting action, thus protecting the machine from overload.

[0004] In existing technology, the force exerted by the outward deformation of the overload elastic plate 320 acts on the placement hole 221 of the small rocker arm 200 through the overload slip ball. Over time, with frequent overload cycles, the outer edge of the placement hole 221 wears down, creating a gap when it engages with the overload slip ball. This gap, amplified by the long distance of the small rocker arm 200, is reflected on the lifting plate of the elevator, causing the lifting plate to fail to lift the tobacco stick or pack to its maximum position. If the subsequent tobacco pusher plate starts pushing the tobacco before it is fully lifted, it will cause squeezing or damage. In this case, the small rocker arm 200 needs to be removed from the elevator for repair or replacement. Replacing the small rocker arm 200 is a very large workload and difficult to repair, seriously affecting the effective operating rate of the equipment, increasing the labor intensity of the workers, and wasting costs. Utility Model Content

[0005] The purpose of this utility model is to provide a sliding sleeve replacement tool and a packaging machine lifter, which improves the problem of excessive operating costs caused by the need to replace the entire part after local wear, reduces maintenance difficulty, saves manpower and material resources, and improves work efficiency.

[0006] To achieve this objective, the present invention adopts the following technical solution:

[0007] Slip sleeve replacement tooling, including:

[0008] Sliding sleeve;

[0009] A sliding sleeve mounting base is provided with a sliding sleeve mounting groove, and the sliding sleeve is selectively embedded in the sliding sleeve mounting groove. The sliding sleeve and the sliding sleeve mounting groove are coaxially arranged. A sliding hole is provided at the bottom of the sliding sleeve mounting groove, and the extension direction of the sliding hole is parallel to the axial direction of the sliding sleeve mounting groove.

[0010] The ejector head is selectively fitted into the sliding hole; when the sliding sleeve is fitted into the sliding sleeve mounting groove, the ejector head can be inserted from the side of the sliding hole away from the sliding sleeve mounting groove until at least a portion of the ejector head abuts against the sliding sleeve.

[0011] The tooling base includes an integrally formed mounting part and a support part. The mounting part is detachably connected to the sliding sleeve mounting base. The support part is spaced apart from the side of the sliding sleeve mounting base near the sliding hole. The support part has a threaded hole.

[0012] A screwed connector, which can be screwed into the threaded hole to allow the screwed connector to be axially displaced along the threaded hole, and the screwed connector selectively abuts against the end of the ejector head away from the sleeve.

[0013] As an optional technical solution for the sleeve replacement tooling, the end of the ejector head away from the sleeve is provided with an alignment groove, and the end of the screw connector that abuts against the ejector head is provided with an alignment protrusion. The alignment protrusion can be placed in the alignment groove, and the ejector head and the screw connector are coaxially arranged.

[0014] As an optional technical solution for the sliding sleeve replacement tool, the axial outer contour of the ejector head has a cross protrusion, the inner wall of the sliding hole is provided with a cross groove, the cross protrusion can be slidably placed in the cross groove, and the outer contour dimension of the ejector head is smaller than the bottom dimension of the sliding sleeve mounting groove.

[0015] As an optional technical solution for the replacement tooling of the sliding sleeve, the sum of the length of the threaded section of the screw connector and the axial length of the ejector head is greater than the distance between the threaded hole and the sliding sleeve mounting groove.

[0016] As an optional technical solution for replacing the sliding sleeve, one end of the threaded connector is provided with a nut, and the sliding sleeve can be selectively coaxially fitted outside the threaded section of the threaded connector. When the sliding sleeve is fitted outside the threaded section of the threaded connector, the end of the threaded connector away from the nut can be screwed into the threaded hole through the sliding hole until the sliding sleeve abuts against the nut. The threaded hole and the sliding sleeve mounting groove are coaxially arranged.

[0017] As an optional technical solution for replacing the sliding sleeve, the difference between the length of the threaded section of the screw connector and the axial length of the sliding sleeve is greater than the distance between the threaded hole and the sliding sleeve mounting groove.

[0018] As an optional technical solution for the replacement tooling of the sliding sleeve, the support part is U-shaped, and both legs of the support part are connected to the mounting part. The mounting part is provided with a first fixing hole on the outer side of each of the two legs. The tooling base also includes a fixing member that can pass through the first fixing hole to connect the tooling base with the sliding sleeve mounting base. The threaded hole is provided in the connection part of the support part located between the two legs.

[0019] As an optional technical solution for the replacement tooling of the sliding sleeve, the mounting part is provided with a snap-fit ​​groove, and the sliding sleeve mounting base is embedded in the snap-fit ​​groove. The groove depth direction of the snap-fit ​​groove is perpendicular to the length direction of the sliding sleeve mounting base and the axial direction of the sliding sleeve.

[0020] As an optional technical solution for the replacement tooling of the sliding sleeve, one side wall of the snap-fit ​​groove is connected to the support leg and has the first fixing hole, and the other side wall of the snap-fit ​​groove has the second fixing hole. The first fixing hole and the second fixing hole are arranged in a one-to-one correspondence. The fixing member passes through the first fixing hole, the sliding sleeve mounting base and the second fixing hole in sequence.

[0021] A packaging machine lifter includes an overload protection device, a large rocker arm, and a small rocker arm. The overload protection device has an overload elastic plate fixed to the large rocker arm. The overload sliding ball of the overload protection device is placed in the placement hole of the small rocker arm. The large rocker arm has an overload sliding ball channel coaxial with the placement hole. The small rocker arm can use the sliding sleeve replacement fixture as described above. The small rocker arm includes a sliding sleeve mounting base and a sliding sleeve. The sliding sleeve mounting base is hinged to the large rocker arm. The inner cavity of the sliding sleeve is the placement hole, and the top of the sliding sleeve mounting groove faces the overload sliding ball channel.

[0022] The beneficial effects of this utility model are:

[0023] The sliding sleeve replacement fixture provided by this utility model includes a sliding sleeve, a sliding sleeve mounting base, an ejector head, a fixture base, and a screw connector. The sliding sleeve mounting base has a sliding sleeve mounting groove, and the sliding sleeve is selectively embedded in the sliding sleeve mounting groove. The sliding sleeve and the sliding sleeve mounting groove are coaxially arranged. A sliding hole is formed at the bottom of the sliding sleeve mounting groove, and the extension direction of the sliding hole is parallel to the axial direction of the sliding sleeve mounting groove. The ejector head is selectively embedded in the sliding hole. When the sliding sleeve is embedded in the sliding sleeve mounting groove, the ejector head can be inserted from the side of the sliding hole away from the sliding sleeve mounting groove until at least a portion of the ejector head abuts against the sliding sleeve. The fixture base includes an integrally formed mounting part and a support part. The mounting part is detachably connected to the sliding sleeve mounting base, and the support part is spaced apart from the side of the sliding sleeve mounting base near the sliding hole. The support part has a threaded hole. The screw connector can be screwed into the threaded hole to allow the screw connector to move axially along the threaded hole. The screw connector selectively abuts against the end of the ejector head away from the sliding sleeve. The screw-in connector can push the ejector head to push the slide sleeve out of the slide sleeve mounting slot, which is used to separate the slide sleeve from the slide sleeve mounting base. This facilitates partial replacement of the slide sleeve mounting base, making slide sleeve replacement easier, simplifying the operation for workers, and saving replacement costs.

[0024] The packaging machine lift provided by this utility model includes an overload protection device, a large rocker arm, and a small rocker arm. The overload elastic plate of the overload protection device is fixed to the large rocker arm, and the overload sliding ball of the overload protection device is placed in the placement hole of the small rocker arm. The large rocker arm has an overload sliding ball channel coaxial with the placement hole. The small rocker arm serves as a sliding sleeve mounting base and can be used in the aforementioned sliding sleeve replacement fixture. The sliding sleeve mounting base is hinged to the large rocker arm. The small rocker arm also includes a sliding sleeve, with the inner cavity of the sliding sleeve serving as the placement hole. The top of the sliding sleeve mounting groove faces the overload sliding ball channel. It is specified that the sliding sleeve is ejected by the sliding sleeve replacement fixture on the side away from the overload sliding ball channel. By redesigning the structure of the small rocker arm, the problem of excessive operating costs caused by the need to replace the entire small rocker arm after local wear is addressed. This avoids the need to replace the entire small rocker arm, saving maintenance costs and reducing maintenance difficulty and time. Without disassembling the small rocker arm, the sliding sleeve can be more easily disassembled and replaced directly on the packaging machine lift, thereby significantly improving the working efficiency of the packaging machine lift. Attached Figure Description

[0025] Figure 1 This is an exploded view of a packaging machine elevator in the prior art;

[0026] Figure 2 This is an exploded view of the sliding sleeve replacement fixture provided in a specific embodiment of this utility model;

[0027] Figure 3 This is a schematic diagram of the structure of the sliding sleeve mounting base of the sliding sleeve replacement tool provided in a specific embodiment of this utility model;

[0028] Figure 4 This is a schematic diagram of the ejector head of the sliding sleeve replacement fixture provided in a specific embodiment of this utility model;

[0029] Figure 5 This is a schematic diagram of the tooling base of the sliding sleeve replacement tooling provided in a specific embodiment of this utility model;

[0030] Figure 6 This is a schematic diagram of the working process of the sliding sleeve replacement tool provided in a specific embodiment of the present invention before the sliding sleeve is removed;

[0031] Figure 7 This is a schematic diagram of the working process of the sliding sleeve replacement tool provided in a specific embodiment of the present invention during the removal of the sliding sleeve;

[0032] Figure 8 yes Figure 7 A sectional view;

[0033] Figure 9 This is an exploded view of a sliding sleeve replacement fixture according to another embodiment of the present invention.

[0034] Figure 10 This is a schematic diagram of the working process of the sliding sleeve replacement tool in the sliding sleeve installation process, according to another embodiment of the present invention.

[0035] Figure 11 yes Figure 10 A sectional view.

[0036] Figure 12 This is a schematic diagram of the working process of the sliding sleeve replacement tool after the sliding sleeve is installed, according to another embodiment of the present invention.

[0037] Figure 13 yes Figure 12 A sectional view.

[0038] In the picture:

[0039] 100. Large rocker arm; 101. Overload ball bearing channel;

[0040] 200. Small rocker arm; 210. Sliding sleeve mounting base; 211. Sliding sleeve mounting groove; 212. Sliding joint hole; 220. Sliding sleeve; 221. Placement hole;

[0041] 300. Overload protection device; 310. Overload slip ball; 320. Overload elastic plate;

[0042] 400. Sticking out;

[0043] 500. Tooling base; 510. Mounting part; 511. First fixing hole; 512. Snap-fit ​​groove; 520. Support part; 521. Threaded hole;

[0044] 600, threaded connector; 610, threaded section; 620, nut. Detailed Implementation

[0045] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present invention and not intended to limit it. Furthermore, it should be noted that, for ease of description, the accompanying drawings show only the parts relevant to the present invention, not the entire structure.

[0046] In the description of this utility model, unless otherwise explicitly specified and limited, the terms "connected," "linked," and "fixed" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0047] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0048] In the description of this embodiment, the terms "upper," "lower," "right," and "left," etc., refer to the orientation or positional relationship shown in the accompanying drawings. They are used only for ease of description and simplification of operation, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. In addition, the terms "first" and "second" are only used for distinction in description and have no special meaning.

[0049] like Figures 2 to 8 As shown, this utility model discloses a sliding sleeve replacement fixture, including a sliding sleeve 220, a sliding sleeve mounting base 210, an ejector head 400, a fixture base 500, and a screw connector 600. The sliding sleeve mounting base 210 has a sliding sleeve mounting groove 211, and the sliding sleeve 220 is selectively embedded in the sliding sleeve mounting groove 211. The sliding sleeve 220 and the sliding sleeve mounting groove 211 are coaxially arranged. A sliding hole 212 is formed at the bottom of the sliding sleeve mounting groove 211, and the extension direction of the sliding hole 212 is parallel to the axial direction of the sliding sleeve mounting groove 211. The ejector head 400 is selectively embedded in the sliding hole 212. When the sliding sleeve 220 is embedded in the sliding sleeve mounting groove 211, the ejector head 400... The ejector head 400 can be inserted from the side of the sliding hole 212 away from the sliding sleeve mounting groove 211 until at least a portion of the ejector head 400 abuts against the sliding sleeve 220; the tooling base 500 includes an integrally formed mounting part 510 and a support part 520, the mounting part 510 is detachably connected to the sliding sleeve mounting base 210, the support part 520 is spaced apart from the side of the sliding sleeve mounting base 210 near the sliding hole 212, and the support part 520 has a threaded hole 521; the screw connector 600 can be screwed into the threaded hole 521 to allow the screw connector 600 to move axially along the threaded hole 521, and the screw connector 600 selectively abuts against the end of the ejector head 400 away from the sliding sleeve 220. The screw connector 600 can push the ejector head 400 to push the slide sleeve 220 out of the slide sleeve mounting groove 211, which is used to separate the slide sleeve 220 from the slide sleeve mounting base 210, making it easier to partially replace the slide sleeve mounting base 210, making the replacement of the slide sleeve 220 easier, simplifying the operation difficulty for workers, and saving replacement costs.

[0050] This utility model also discloses a packaging machine lifter, including an overload protection device, a large rocker arm, and a small rocker arm. The overload elastic plate 320 of the overload protection device is fixed to the large rocker arm, and the overload sliding ball 310 of the overload protection device is placed in the placement hole 221 of the small rocker arm. The large rocker arm has an overload sliding ball channel 101 coaxial with the placement hole 221. The small rocker arm serves as a sliding sleeve mounting base 210 and can be used in the aforementioned sliding sleeve replacement fixture. The sliding sleeve mounting base 210 is hinged to the large rocker arm. The small rocker arm also includes a sliding sleeve 220, with the inner cavity of the sliding sleeve 220 serving as the placement hole 221. The top of the sliding sleeve mounting groove 211 faces the overload sliding ball channel 101. It is stipulated that the sliding sleeve 220 is ejected on the side away from the overload sliding ball channel 101 using the sliding sleeve replacement fixture. By redesigning the structure of the small rocker arm, improvements have been made to address the issue of excessive operating costs caused by the need to replace the entire small rocker arm after local wear. This avoids the need to replace the entire small rocker arm, reduces the cost of spare parts, saves on maintenance costs, and reduces the difficulty and time of maintenance. Without disassembling the small rocker arm, the sliding sleeve 220 can be more easily disassembled and replaced directly on the packaging machine elevator, thereby significantly improving the working efficiency of the packaging machine elevator.

[0051] In this embodiment, the axial outer contour of the ejector head 400 has a cross-shaped protrusion, and the inner wall of the sliding hole 212 is provided with a cross-shaped groove. The cross-shaped protrusion can slide in the cross-shaped groove, which can prevent the ejector head 400 from rotating and make the sliding of the ejector head 400 along the sliding hole 212 more stable. The outer contour dimension of the ejector head 400 is smaller than the bottom dimension of the sliding sleeve mounting groove 211. Only the cross-shaped protrusion abuts against the sliding sleeve 220. The shape of the cross-shaped protrusion has a uniform circumferential arrangement, which makes the force points of the sliding sleeve 220 more uniform. The sliding sleeve 220 is pushed out by the ejector head 400 more smoothly, effectively reducing the wear on the sliding sleeve mounting base 210.

[0052] For example, the end of the ejector head 400 away from the sliding sleeve 220 is provided with an alignment groove, and the end of the screw connector 600 that abuts against the ejector head 400 is provided with an alignment protrusion. The alignment protrusion can be placed in the alignment groove, and the ejector head 400 and the screw connector 600 are coaxially arranged, which facilitates the connection between the screw connector 600 and the ejector head 400 and limits the positioning, making the bearing structure more stable. The entire sliding sleeve replacement fixture is coaxially arranged with the axis of the sliding sleeve mounting groove 211 on the sliding sleeve mounting base 210 as the central axis. This not only makes the structure more stable, but also allows the desired effect to be achieved with relatively less applied force.

[0053] Specifically, when the small rocker arm is found to be worn and needs repair, the first step is to remove the slide sleeve 220. Then, depending on the specific condition of the slide sleeve 220, it is determined whether the slide sleeve 220 needs to be reversed or flipped before reinstallation. This can further reduce replacement costs. When the removed slide sleeve 220 is not sufficient to reliably support the overload ball bearing 310, a new slide sleeve 220 needs to be installed.

[0054] Furthermore, the support portion 520 is U-shaped, and both legs of the support portion 520 are connected to the mounting portion 510. The mounting portion 510 has a first fixing hole 511 on the outer side of each of the two legs. The tooling base 500 also includes a fixing member that can pass through the first fixing hole 511 to connect the tooling base 500 to the sliding sleeve mounting base 210. A threaded hole 521 is provided in the connection portion of the support portion 520 between the two legs. When disassembling the sliding sleeve 220, the ejector part needs to be inserted into the sliding hole 212 first, and then the tooling base 500 is installed onto the sliding sleeve mounting base 210 to reduce the installation difficulty and prevent the U-shaped support portion 520 from obstructing the installation operation angle of the ejector head 400.

[0055] In this embodiment, the mounting part 510 has a snap-fit ​​groove 512, and the sliding sleeve mounting base 210 is embedded in the snap-fit ​​groove 512. Since the small rocker arm is a long strip, choosing a suitable slotting direction for the snap-fit ​​groove 512 is particularly important for observing the disassembly and assembly progress of the sliding sleeve 220. The groove depth of the snap-fit ​​groove 512 is perpendicular to the length direction of the sliding sleeve mounting base 210 and the axial direction of the sliding sleeve 220. The relative position of the sliding sleeve 220 can be observed in real time from the side, reducing obstruction and improving the practicality of the sliding sleeve replacement tooling.

[0056] Optionally, one side wall of the snap-fit ​​groove 512 is connected to the support leg and has a first fixing hole 511, and the other side wall of the snap-fit ​​groove 512 has a second fixing hole. The first fixing hole 511 and the second fixing hole are arranged in a one-to-one correspondence. The fastener passes through the first fixing hole 511, the sliding sleeve mounting base 210 and the second fixing hole in sequence, which can further enhance the assembly stability of the tooling base 500.

[0057] Specifically, the sum of the length of the threaded section 610 of the screw connector 600 and the axial length of the ejector head 400 is greater than the distance between the threaded hole 521 and the sliding sleeve mounting groove 211, which can satisfy the disassembly and ejection of the sliding sleeve 220.

[0058] like Figures 9 to 13As shown, in another embodiment of this invention, the threaded hole 521 and the sliding sleeve mounting groove 211 are coaxially arranged. One end of the screw connector 600 is provided with a nut 620, which protrudes circumferentially from one end of the threaded section 610. The sliding sleeve 220 can be selectively coaxially fitted outside the threaded section 610 of the screw connector 600. Due to the obstruction of the nut 620, the sliding sleeve 220 will not fall off from the other end. When the sliding sleeve 220 is fitted outside the threaded section 610 of the screw connector 600, the end of the screw connector 600 away from the nut 620 can be screwed into the threaded hole 521 through the sliding hole 212 until the sliding sleeve 220 abuts against the nut 620. At the same time, the sliding sleeve 220 is aligned with the sliding sleeve mounting groove 211. The nut 620 can be fed axially to push the sliding sleeve 220 to gradually and completely embed into the sliding sleeve mounting groove 211. By rotating the screw connector 600, the slide sleeve replacement tool can also complete the installation of the slide sleeve 220. This slide sleeve replacement tool can help the staff replace the slide sleeve 220 throughout the process, further improving the practicality of the slide sleeve replacement tool.

[0059] Specifically, the difference between the length of the threaded section 610 of the screw connector 600 and the axial length of the sliding sleeve 220 is greater than the distance between the threaded hole 521 and the sliding sleeve mounting groove 211. This can simultaneously ensure the straightness of the axial movement of the screw connector 600, making the installation of the sliding sleeve 220 smooth and meeting the requirements for the sliding sleeve 220 to be installed in place.

[0060] Obviously, the above embodiments of this utility model are merely examples for clearly illustrating the present utility model, and are not intended to limit the implementation of the present utility model. Those skilled in the art can make various obvious changes, readjustments, and substitutions without departing from the protection scope of this utility model. It is neither necessary nor possible to exhaustively describe all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this utility model should be included within the protection scope of the claims of this utility model.

Claims

1. A tooling for changing sliding sleeves, characterized in that, include: Sliding sleeve (220); A sliding sleeve mounting base (210) is provided with a sliding sleeve mounting groove (211). The sliding sleeve (220) is selectively embedded in the sliding sleeve mounting groove (211). The sliding sleeve (220) and the sliding sleeve mounting groove (211) are coaxially arranged. A sliding hole (212) is provided at the bottom of the sliding sleeve mounting groove (211). The extending direction of the sliding hole (212) is parallel to the axial direction of the sliding sleeve mounting groove (211). An ejector head (400) is selectively fitted into the sliding hole (212); when the sliding sleeve (220) is fitted into the sliding sleeve mounting groove (211), the ejector head (400) can be inserted from the side of the sliding hole (212) away from the sliding sleeve mounting groove (211) until at least a portion of the ejector head (400) abuts against the sliding sleeve (220); Tooling base (500), the tooling base (500) includes an integrally formed mounting part (510) and a support part (520), the mounting part (510) is detachably connected to the sliding sleeve mounting base (210), the support part (520) is spaced apart from the side of the sliding sleeve mounting base (210) near the sliding hole (212), and the support part (520) is provided with a threaded hole (521); A screw connector (600) is screwed into the threaded hole (521) to allow the screw connector (600) to be axially displaced along the threaded hole (521), and the screw connector (600) selectively abuts against the end of the ejector head (400) away from the sleeve (220).

2. The sleeve replacement fixture according to claim 1, characterized in that, The ejector head (400) is provided with a alignment groove at one end away from the sliding sleeve (220), and the screw connector (600) is provided with an alignment protrusion at one end that abuts against the ejector head (400). The alignment protrusion can be placed in the alignment groove, and the ejector head (400) and the screw connector (600) are coaxially arranged.

3. The sleeve replacement fixture according to claim 1, characterized in that, The outer axial contour of the ejector head (400) has a cross protrusion, and the inner wall of the sliding hole (212) is provided with a cross groove. The cross protrusion can slide in the cross groove. The outer contour dimension of the ejector head (400) is smaller than the bottom dimension of the sliding sleeve mounting groove (211).

4. The sleeve replacement fixture according to claim 1, characterized in that, The sum of the length of the threaded section (610) of the bolt (600) and the axial length of the ejector head (400) is greater than the distance between the threaded hole (521) and the sliding sleeve mounting groove (211).

5. The sleeve replacement fixture according to claim 1, characterized in that, One end of the threaded connector (600) is provided with a nut (620). The sliding sleeve (220) can be selectively coaxially fitted outside the threaded section (610) of the threaded connector (600). When the sliding sleeve (220) is fitted outside the threaded section (610) of the threaded connector (600), the end of the threaded connector (600) away from the nut (620) can be screwed into the threaded hole (521) through the sliding hole (212) until the sliding sleeve (220) abuts against the nut (620). The threaded hole (521) and the sliding sleeve mounting groove (211) are coaxially arranged.

6. The sleeve replacement fixture according to claim 5, characterized in that, The difference between the length of the threaded section (610) of the bolt (600) and the axial length of the sliding sleeve (220) is greater than the distance between the threaded hole (521) and the sliding sleeve mounting groove (211).

7. The sleeve replacement fixture according to claim 1, characterized in that, The support part (520) is U-shaped, and both legs of the support part (520) are connected to the mounting part (510). The mounting part (510) has a first fixing hole (511) on the outer side of each of the two legs. The tooling base (500) also includes a fixing member that can pass through the first fixing hole (511) to connect the tooling base (500) with the sliding sleeve mounting base (210). The threaded hole (521) is provided in the connection part of the support part (520) between the two legs.

8. The sleeve replacement fixture according to claim 7, characterized in that, The mounting part (510) has a snap-fit ​​groove (512), and the sliding sleeve mounting base (210) is embedded in the snap-fit ​​groove (512). The groove depth direction of the snap-fit ​​groove (512) is perpendicular to the length direction of the sliding sleeve mounting base (210) and the axial direction of the sliding sleeve (220).

9. The sleeve replacement fixture according to claim 8, characterized in that, One side wall of the snap-fit ​​groove (512) is connected to the support leg and has the first fixing hole (511). The other side wall of the snap-fit ​​groove (512) has the second fixing hole. The first fixing hole (511) and the second fixing hole are arranged in a one-to-one correspondence. The fixing member passes through the first fixing hole (511), the sliding sleeve mounting base (210) and the second fixing hole in sequence.

10. A packaging machine lifter, comprising an overload protection device, a large rocker arm, and a small rocker arm, wherein the overload protection device has an overload elastic plate (320) fixed to the large rocker arm, and an overload ball bearing (310) of the overload protection device is placed in a placement hole (221) of the small rocker arm, and the large rocker arm has an overload ball bearing channel (101) coaxial with the placement hole (221), characterized in that, The small rocker arm can be equipped with the sliding sleeve replacement fixture as described in any one of claims 1-9. The small rocker arm includes the sliding sleeve mounting base (210) and the sliding sleeve (220). The sliding sleeve mounting base (210) is hinged to the large rocker arm. The inner cavity of the sliding sleeve (220) is the placement hole (221). The top of the sliding sleeve mounting groove (211) faces the overload ball channel (101).

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