Multi-stage push head mechanism and garbage compression equipment

Abstract

The utility model belongs to the technical field of garbage compression and provides a multistage push head mechanism and garbage compression equipment, the multistage push head mechanism comprises a push head assembly, an oil cylinder assembly and an oil cylinder protective cover, the push head assembly comprises a rear push head and a front push head, and the rear push head and the front push head are respectively provided with a first cover plate and a second cover plate. The oil cylinder assembly comprises a second-stage oil cylinder arranged between the rear push head and the front push head, the two ends of the second-stage oil cylinder are located below the first cover plate and the second cover plate respectively, the second-stage oil cylinder and the first cover plate are vertically spaced to form a sliding space, an oil cylinder protective cover is movably arranged in the sliding space, and the front end of the oil cylinder protective cover is connected with the front push head. And the oil cylinder protective cover is used for covering the extended cylinder rod part of the secondary oil cylinder. By means of the first cover plate, the second cover plate and the oil cylinder protective cover, it can be guaranteed that the upper portion of the oil cylinder assembly is shielded all the time when the multi-stage push head mechanism works, and therefore the situation that garbage falls to the surface of an oil cylinder, and the oil cylinder is polluted or damaged is avoided.

Description

Technical Field

[0001] The utility model belongs to the technical field of garbage compression, and in particular relates to a multi-stage push head mechanism and garbage compression equipment. Background Art

[0002] For large garbage transfer stations, in order to ensure that the pusher head in the garbage bin has enough pushing stroke, some garbage compression equipment will use a front and rear two-stage pusher head compression solution. There is a certain gap between the joint surface of the front pusher head and the rear pusher head, and the gap is difficult to control during production. If the gap is designed to be too small, it will cause interference between the top plate after the front pusher head and the rear pusher head are merged. If the gap is too large, it will cause garbage to leak from the joint surface of the front pusher head and the rear pusher head, and the garbage will fall between the front pusher head and the rear pusher head. At the same time, after the front pusher head and the rear pusher head are separated, the driving cylinder of the front pusher head cannot be effectively protected, and the garbage will fall onto the cylinder rod of the front pusher head, which can easily cause scratches on the cylinder rod of the front pusher head and failure of the oil seal, and the reliability is poor. Utility Model Content

[0003] In view of the above-mentioned defects or shortcomings, the utility model provides a multi-stage push head mechanism and garbage compression equipment, aiming to solve the technical problem that the existing multi-stage push head type garbage compression equipment easily causes scratches on the cylinder rod of the front push head cylinder and damage to the cylinder.

[0004] To achieve the above-mentioned purpose, the utility model provides a multi-stage push head mechanism, which includes a push head assembly, a cylinder assembly and a cylinder protective cover. The push head assembly includes a rear push head and a front push head, and the rear push head and the front push head are respectively provided with a first cover plate and a second cover plate. The cylinder assembly includes a secondary oil cylinder arranged between the rear push head and the front push head, and the two ends of the secondary oil cylinder are respectively located below the first cover plate and the second cover plate. The secondary oil cylinder and the first cover plate are spaced up and down to form a sliding space. The cylinder protective cover is movably arranged in the sliding space and the front end is connected to the front push head. The cylinder protective cover is used to cover the cylinder rod portion extended in the secondary oil cylinder.

[0005] In an embodiment of the utility model, a sliding guide groove extending in the front-rear direction is provided in the sliding space, and the oil cylinder protection cover is movably arranged in the sliding guide groove and the front end thereof extends to below the second cover plate.

[0006] In an embodiment of the utility model, a first scraper is provided at the front end of the sliding guide groove, and the first scraper abuts against the upper surface of the oil cylinder protective cover and is used to scrape the upper surface of the oil cylinder protective cover.

[0007] In an embodiment of the utility model, a middle cover plate is also provided on the rear push head. The middle cover plate is located on the front side of the first cover plate and is arranged between the cylinder protective cover and the secondary cylinder. The middle cover plate is used to receive the garbage falling from the upper surface of the cylinder protective cover and to cover and protect the secondary cylinder below.

[0008] In an embodiment of the utility model, a second scraper is further provided on the front pushing head. The second scraper is located below the oil cylinder protective cover and is used to scrape the upper surface of the center cover plate.

[0009] In an embodiment of the utility model, a guide block is further provided at the rear end of the middle cover plate, and a V-shaped guide surface is provided on the side of the guide block facing the front push head, and the V-shaped guide surface is used to guide the garbage swept backward by the second scraper to the lateral sides of the rear push head, and / or a first guide groove is further provided at the front end of the middle cover plate, and the first guide groove is used to receive the garbage swept forward by the second scraper and guide the garbage to the lateral sides of the rear push head.

[0010] In an embodiment of the utility model, the cylinder assembly also includes a first-stage cylinder for driving the rear push head to move, the first-stage cylinder is located below the first cover plate, the sliding guide groove is arranged through the front and rear, the tail end of the cylinder guard cover can extend from the rear end of the first cover plate and is used to cover the first-stage cylinder, and a third scraper is also provided at the rear end of the first cover plate, and the third scraper is used to scrape the upper surface of the cylinder guard cover.

[0011] In an embodiment of the utility model, a third scraper and a second guide groove are also provided at the rear end of the first cover plate. The third scraper is used to scrape the upper surface of the cylinder guard cover, and the second guide groove is used to receive the garbage scraped by the third scraper and guide the garbage to the lateral sides of the rear push head.

[0012] In an embodiment of the utility model, a wear-resistant sliding block is further provided on the lower surface of the oil cylinder protective cover, and the wear-resistant sliding block is used to abut against the groove wall of the sliding guide groove.

[0013] In an embodiment of the utility model, the first cover plate and the second cover plate can be spliced ​​together when the front pushing head and the rear pushing head are merged, and the front end of the first cover plate and the rear end of the second cover plate are respectively provided with splicing interfaces for splicing, and the first lateral side edge and the second lateral side edge of the splicing interface are staggered front and back.

[0014] In the embodiment of the utility model, a flexible sealing strip is also provided on the joint surface.

[0015] In an embodiment of the utility model, the upper surface of the oil cylinder protective cover is a flow guiding slope, and the flow guiding slope is inclined downward from the transverse center to the transverse edge to guide the flow.

[0016] To achieve the above objectives, the utility model also provides a garbage compression device, wherein the garbage compression device comprises the multi-stage push head mechanism and a garbage compression box body as described above, and the multi-stage push head mechanism is arranged in the garbage compression box body.

[0017] Through the above technical solution, the multi-stage push head mechanism provided by the embodiment of the utility model has the following beneficial effects:

[0018] When the secondary oil cylinder is extended for the second time, the first cover plate and the second cover plate will be separated, and the movement of the front push head will pull the cylinder protective cover out from under the first cover plate to fill the gap between the first cover plate and the second cover plate, thereby covering the extended cylinder rod part of the secondary oil cylinder. In summary, the multi-stage push head mechanism in the utility model can cover the front end part of the first-stage oil cylinder and the rear end part of the second-stage oil cylinder by setting the first cover plate, can cover the front end part of the second-stage oil cylinder by setting the second cover plate, and can cover the extended cylinder rod part of the second-stage oil cylinder by setting the cylinder protective cover. Through the first cover plate, the second cover plate and the cylinder protective cover, it can be ensured that the top of the cylinder assembly is always covered when the multi-stage push head mechanism is working, thereby preventing garbage from falling onto the surface of the cylinder and causing the cylinder to be contaminated or damaged.

[0019] Other features and advantages of the present invention will be described in detail in the subsequent specific implementation section. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The accompanying drawings are used to provide an understanding of the present invention and constitute a part of the specification. Together with the following specific embodiments, they are used to explain the present invention, but do not constitute a limitation to the present invention. In the accompanying drawings:

[0021] Figure 1 It is an overall schematic diagram of the multi-stage push head mechanism in the extended state according to the embodiment of the utility model;

[0022] Figure 2 It is a schematic diagram of the overall cross-sectional structure of the multi-stage push head mechanism according to the embodiment of the utility model;

[0023] Figure 3 According to the embodiment of the present utility model Figure 2 A schematic diagram of the enlarged structure at A in the middle;

[0024] Figure 4 It is a structural schematic diagram of a rear push head of a multi-stage push head mechanism according to an embodiment of the utility model;

[0025] Figure 5 It is a rear view structural schematic diagram of a multi-stage push head mechanism according to an embodiment of the utility model;

[0026] Figure 6 It is an overall schematic diagram of the multi-stage push head mechanism in a combined state according to an embodiment of the utility model.

[0027] Description of Reference Numerals

[0028] 1 Push head assembly 11 rear push head

[0029] 111 first cover plate 112 first scraper

[0030] 113 Middle cover 114 Guide block

[0031] 114a V-shaped guide surface 115 first guide groove

[0032] 116 third scraper 117 second guide groove

[0033] 12 front push head 121 second cover plate

[0034] 122 Second scraper 2 cylinder assembly

[0035] 21 First level cylinder 22 Second level cylinder

[0036] 3 Cylinder protective cover 31 Diversion slope

[0037] 31a lateral center 31b lateral edge

[0038] 41 Sliding space 42 Sliding guide groove

[0039] 43 Splicing interface 43a First transverse side edge

[0040] 43b Second transverse side edge DETAILED DESCRIPTION

[0041] The specific embodiments of the present invention are described in detail below in conjunction with the accompanying drawings. It should be understood that the specific embodiments described herein are only used to illustrate and explain the present invention, and are not used to limit the present invention.

[0042] The multi-stage pusher mechanism of the present invention will be described below with reference to the accompanying drawings.

[0043] The utility model provides a multi-stage push head mechanism, such as Figure 1 , Figure 5 and Figure 6 As shown, the multi-stage push head mechanism includes:

[0044] The push head assembly 1 includes a rear push head 11 and a front push head 12. The top ends of the rear push head 11 and the front push head 12 are respectively provided with a first cover plate 111 and a second cover plate 121. Of course, the first cover plate 111 and the second cover plate 121 can also be arranged at other height positions.

[0045] The cylinder assembly 2 includes a primary cylinder 21 for driving the rear push head 11 to extend and a secondary cylinder 22 for driving the front push head 12 to extend relative to the rear push head 11. The primary cylinder 21 and the secondary cylinder 22 are respectively located below the first cover plate 111 and the second cover plate 121, and one end of the secondary cylinder 22 is also located below the first cover plate 111; and

[0046] The oil cylinder protection cover 3 covers the top of the secondary oil cylinder 22 and can move forward and backward under the first cover plate 111 . The front end of the oil cylinder protection cover 3 is connected to the front push head 12 .

[0047] Taking the two-pole push head mechanism as an example, the front push head 12 and the rear push head 11 are in a merged state in the initial state. When the compression operation is performed, the first-stage oil cylinder 21 is first controlled to extend, and the first-stage oil cylinder 21 will push the rear push head 11 and the front push head 12 to move forward synchronously, thereby realizing the first-stage extension of the rear push head 11. When the first-stage oil cylinder 21 is extended to the full extent, the second-stage oil cylinder 22 continues to extend. At this time, the front push head 12 will continue to move forward relative to the rear push head 11, realizing the second-stage extension of the front push head 12. When the first-stage oil cylinder 21 is extended, the front push head 12 and the rear push head 11 are moved forward synchronously. The head 11 remains in a combined state, at which time the first cover plate 111 and the second cover plate 121 will be assembled and covered above the push head assembly 1, thereby covering and protecting the oil cylinder under the cover plate. When the secondary oil cylinder 22 is extended at the second stage, the first cover plate 111 and the second cover plate 121 will separate, and the movement of the front push head 12 will pull the oil cylinder protective cover 3 out from under the first cover plate 111 to fill the gap between the first cover plate 111 and the second cover plate 121, thereby covering the extended cylinder rod part of the secondary oil cylinder 22. In summary, the multi-stage push head mechanism in the utility model can cover the front end part of the first-stage oil cylinder 21 and the rear end part of the second-stage oil cylinder 22 by setting the first cover plate 111, can cover the front end part of the second-stage oil cylinder 22 by setting the second cover plate 121, and can cover the extended cylinder rod part of the second-stage oil cylinder 22 by setting the cylinder protective cover 3. Through the first cover plate 111, the second cover plate 121 and the cylinder protective cover, it can be ensured that there is always a baffle above the cylinder assembly 2 when the multi-stage push head mechanism is working, thereby preventing garbage from falling onto the surface of the cylinder and causing the cylinder to be contaminated or damaged.

[0048] It should be noted that the multi-stage pushing head mechanism in the utility model is mainly used in garbage compression equipment. For this type of equipment, the pushing and compression of garbage mainly occur in the front section of the garbage box, and the activity area of ​​the secondary cylinder 22 is mainly concentrated in the front section of the garbage box. Therefore, it is necessary to set a cylinder protection cover 3 to focus on protecting the secondary cylinder 22. The main activity area of ​​the primary cylinder 21 is the rear section of the garbage box, where garbage rarely enters. Therefore, it is only necessary to set the first cover plate 111 to cover the front end of the primary cylinder.

[0049] It should be noted that the multi-stage pusher head mechanism in the present invention can theoretically also be a three-stage pusher head mechanism, a four-stage pusher head mechanism, etc. In this case, the above-mentioned rear pusher head 11 and front pusher head 12 can be any two adjacent pusher heads in the multi-stage pusher head mechanism.

[0050] like Figure 4 and Figure 5 As shown, in the embodiment of the utility model, the primary oil cylinder 21 and the first cover plate 111 are spaced up and down to form a sliding space 41, and a sliding guide groove 42 extending in the front-to-back direction is provided in the sliding space 41, and the oil cylinder protection cover 3 is movably arranged in the sliding guide groove 42 and the front end extends to the bottom of the second cover plate 121. Specifically, the first cover plate 111 is mainly used to cover the front end of the primary oil cylinder 21 and the rear end of the secondary oil cylinder 22, and the sliding guide groove 42 is arranged between the secondary oil cylinder 22 and the first cover plate 111. By providing the sliding guide groove 42, while ensuring that the oil cylinder protection cover 3 can accurately cover the secondary oil cylinder 22, the oil cylinder protection cover 3 can also be supported.

[0051] like Figure 4 As shown, in the embodiment of the utility model, the front end of the sliding guide groove 42 is provided with a first scraper 112, and the first scraper 112 abuts against the upper surface of the cylinder guard 3 and is used to scrape the upper surface of the cylinder guard 3. The cylinder guard 3 can block above the secondary cylinder 22 to prevent the garbage above from falling onto the cylinder rod of the secondary cylinder 22. When the cylinder guard 3 is shielded, the fallen garbage will inevitably remain on the upper surface. By arranging the first scraper 112 at the front end of the sliding guide groove 42, the upper surface of the cylinder guard 3 can be scraped when the cylinder guard 3 is retracted to the sliding space 41, thereby preventing the garbage remaining on the upper surface of the cylinder guard 3 from entering the sliding guide groove 42, and realizing the self-cleaning of the cylinder guard 3.

[0052] like Figure 1 , Figure 2 and Figure 4 As shown, in the embodiment of the utility model, a middle cover plate 113 is also provided on the rear push head 11, and the middle cover plate 113 is located at the front side of the first cover plate 111 and is arranged between the oil cylinder protection cover 3 and the secondary oil cylinder 22, and the middle cover plate 113 is used to receive the garbage dropped from the upper surface of the oil cylinder protection cover 3 and cover and protect the secondary oil cylinder 22 below. The width of the oil cylinder protection cover 3 is generally smaller than the width of the first cover plate 111, and when the oil cylinder protection cover 3 is retracted, with the scraping of the first scraper 112 and the falling of the garbage on the upper surface of the first cover plate 111, a large amount of garbage and sewage will accumulate at the front end of the first cover plate 111. In order to prevent the accumulated garbage and sewage from affecting the protective effect of the secondary oil cylinder 22, a middle cover plate 113 with a wider width can be arranged below the oil cylinder protection cover 3 to further increase the protective effect.

[0053] like Figure 2 and Figure 3 As shown, in the embodiment of the utility model, the front push head 12 is further provided with a second scraper 122, which is located below the oil cylinder protection cover 3 and is used to scrape the upper surface of the middle cover plate 113. By providing the second scraper 122, the upper surface of the middle cover plate 113 can be cleaned during the merging process of the front push head 12 and the rear push head 11, thereby realizing self-cleaning of the middle cover plate 113.

[0054] like Figure 2 and Figure 4 As shown, in the embodiment of the utility model, the rear end of the middle cover plate 113 is further provided with a guide block 114, and the guide block 114 is provided with a V-shaped guide surface 114a on the side facing the front push head 12, and the V-shaped guide surface 114a is used to guide the garbage scraped backward by the second scraper 122 to the lateral sides of the rear push head 11. When the front push head 12 moves backward relative to the rear push head 11, the second scraper 122 will scrape the garbage on the upper surface of the middle cover plate 113 backward, and by providing the V-shaped guide surface 114a, the garbage and sewage scraped backward by the second scraper 122 can be guided to the lateral sides of the rear push head 11.

[0055] like Figure 2 and Figure 4 As shown, in the embodiment of the utility model, the front end of the middle cover plate 113 is further provided with a first guide groove 115, and the first guide groove 115 is used to receive the garbage swept forward by the second scraper 122 and guide the garbage to the lateral sides of the rear push head 11. After the second scraper 122 scrapes backward, garbage and sewage may still remain on the surface of the middle cover plate 113, and the remaining garbage and sewage will be scraped forward by the second scraper 122 when the secondary oil cylinder 22 extends. The first guide groove 115 is provided to receive these garbage and sewage and guide them to the lateral sides of the rear push head 11. Preferably, the first guide groove 115 is arranged in a V shape.

[0056] like Figure 4 , Figure 5 and Figure 6As shown, in the embodiment of the utility model, the sliding guide groove 42 is arranged through the front and back, and the cylinder protection cover 3 can extend from the rear end of the first cover plate 111. The rear end of the first cover plate 111 is also provided with a third scraper 116, and the third scraper 116 is used to scrape the upper surface of the cylinder protection cover 3. In order to enable the cylinder protection cover 3 to also protect the primary cylinder 21, preferably, the length of the cylinder protection cover 3 can be set so that the rear end of the cylinder protection cover 3 extends from the rear end of the first cover plate 111 when the front push head 12 and the rear push head 11 are combined. By setting the rear end of the cylinder protection cover 3 to extend from the rear end of the first cover plate 111, the garbage falling from the rear end of the first cover plate 111 can be received by the cylinder protection cover 3, and the garbage can be prevented from falling onto the primary cylinder 21. By setting the third scraper 116 at the rear end of the first cover plate 111, the garbage falling onto the rear end of the cylinder protection cover 3 can be scraped away, and the self-cleaning of the cylinder protection cover 3 can be further achieved.

[0057] like Figure 4 , Figure 5 and Figure 6 As shown, in the embodiment of the utility model, the rear end of the first cover plate 111 is further provided with a second guide groove 117, and the second guide groove 117 is used to receive the garbage scraped by the third scraper 116 and guide the garbage to the lateral sides of the rear push head 11. Specifically, the second guide groove 117 is arranged below the rear notch of the sliding guide groove 42, and the second guide groove 117 is preferably designed in a V shape.

[0058] In the embodiment of the utility model, the lower surface of the oil cylinder protection cover 3 is also provided with a wear-resistant slider, which is used to abut against the groove wall of the sliding guide groove 42. By providing the wear-resistant slider, the oil cylinder protection cover 3 can be prevented from being worn and the service life of the oil cylinder protection cover 3 can be increased.

[0059] In the embodiment of the utility model, the wear-resistant sliding block is detachably arranged, so that it is convenient to disassemble and replace the wear-resistant sliding block when it is worn to a certain extent.

[0060] like Figure 6 As shown, in the embodiment of the utility model, the first cover plate 111 and the second cover plate 121 can be spliced ​​together when the front push head 12 and the rear push head 11 are combined, and the front end of the first cover plate 111 and the rear end of the second cover plate 121 are respectively provided with a splicing interface 43 for splicing, and the first lateral side edge 43a and the second lateral side edge 43b of the splicing interface 43 are staggered front and back. A scraper for scraping the upper surface of the first cover plate 111 is generally also provided on the inner wall of the garbage bin, and by staggering the first lateral side edge 43a and the second lateral side edge 43b, the moving resistance of the scraper when passing through this place can be reduced, and the scraper can be prevented from being stuck.

[0061] In an embodiment of the utility model, a flexible sealing strip is also provided on the splicing interface 43. Specifically, a flexible sealing strip is provided on the splicing surface of the splicing interface 43 of the first cover plate 111 and / or the second cover plate 121. The flexible sealing strip is made of a flexible material and has a large compression margin. When the first cover plate 111 and the second cover plate 121 are combined, the flexible sealing strip can be tightly attached between the joints of the first cover plate 111 and the second cover plate 121 to ensure that there is no gap at the joint to prevent garbage from falling into the middle of the front and rear pushing heads. At the same time, when the front and rear pushing heads move together, since the first cover plate 111 and the second cover plate 121 are made of a flexible material, the thrust of the rear pushing head 11 will not be transmitted to the cover plate of the front pushing head 12, thereby effectively protecting the cover plate on the front pushing head.

[0062] In an embodiment of the utility model, the first scraper 112 and the flexible sealing strip can be the same component, that is, the flexible sealing strip has both the scraping function of the scraper and the sealing function when spliced. Specifically, the flexible sealing strip can be set at the front end of the first cover plate 111 of the rear push head 11, and the lower end of the flexible sealing strip can abut against the upper surface of the cylinder protective cover 3. When the cylinder protective cover 3 retreats with the front push head 12, the flexible sealing strip can scrape the upper surface of the cylinder protective cover 3 to achieve self-cleaning of the cylinder protective cover 3 and prevent garbage from entering the sliding guide groove 42. When the first cover plate 111 and the second cover plate 121 are combined, the flexible sealing strip can be flexibly sealed and filled between the first cover plate 111 and the second cover plate 121. Of course, the first scraper 112 and the flexible sealing strip can also be two independent components.

[0063] like Figure 2 As shown, in the embodiment of the utility model, the upper surface of the oil cylinder protection cover 3 is a guide slope 31, and the guide slope 31 is inclined downward from the horizontal center 31a to the horizontal edge 31b to guide the flow. That is, the upper surface of the oil cylinder protection cover 3 is a convex shape with a high middle and low edges, so that the garbage can fall to both sides more easily.

[0064] In the embodiment of the present utility model, the oil cylinder protection cover 3 is preferably hinged to the front thrust head 12 .

[0065] To achieve the above purpose, the utility model also provides a garbage compression device, wherein the garbage compression device comprises the multi-stage push head mechanism and the garbage compression box according to the above, the garbage compression box is placed horizontally, and the multi-stage push head mechanism is arranged in the garbage compression box. Since the garbage compression device adopts all the technical solutions of the above embodiments, it has at least the beneficial effects brought by the above embodiments, which will not be described one by one here.

[0066] In the description of the present invention, it should be understood that the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of the features. In the description of the present invention, "plurality" means at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0067] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral one; it can be a mechanical connection, an electrical connection, or communication with each other; it can be a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0068] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the utility model. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0069] Although the embodiments of the present invention have been described above, it is understandable that the above embodiments are exemplary and cannot be construed as limitations on the present invention. A person skilled in the art may change, modify, replace and modify the above embodiments within the scope of the present invention.

Claims

1. A multi-stage push head mechanism, characterized in that: The multi-stage push head mechanism comprises: A push head assembly (1), comprising a rear push head (11) and a front push head (12), wherein the rear push head (11) and the front push head (12) are respectively provided with a first cover plate (111) and a second cover plate (121); The oil cylinder assembly (2) comprises a secondary oil cylinder (22) arranged between the rear push head (11) and the front push head (12), the two ends of the secondary oil cylinder (22) being respectively located below the first cover plate (111) and the second cover plate (121), and the secondary oil cylinder (22) and the first cover plate (111) are spaced up and down to form a sliding space (41); and A cylinder protection cover (3) is movably arranged in the sliding space (41) and the front end of which is connected to the front push head (12). The cylinder protection cover (3) is used to cover the cylinder rod portion extending in the secondary cylinder (22).

2. The multi-stage push head mechanism according to claim 1, characterized in that: A sliding guide groove (42) extending in the front-rear direction is provided in the sliding space (41); the oil cylinder protection cover (3) is movably arranged in the sliding guide groove (42) and the front end of the oil cylinder protection cover (3) extends to below the second cover plate (121).

3. The multi-stage push head mechanism according to claim 2, characterized in that: A first scraper (112) is provided at the front end of the sliding guide groove (42), and the first scraper (112) abuts against the upper surface of the oil cylinder protective cover (3) and is used to scrape the upper surface of the oil cylinder protective cover (3).

4. The multi-stage push head mechanism according to claim 3, characterized in that: The rear push head (11) is also provided with a middle cover plate (113), which is located on the front side of the first cover plate (111) and is arranged between the oil cylinder protection cover (3) and the secondary oil cylinder (22). The middle cover plate (113) is used to receive garbage dropped from the upper surface of the oil cylinder protection cover (3) and to cover and protect the secondary oil cylinder (22) below.

5. The multi-stage push head mechanism according to claim 4, characterized in that: The front push head (12) is also provided with a second scraper (122), which is located below the oil cylinder protective cover (3) and is used to scrape the upper surface of the middle cover plate (113).

6. The multi-stage push head mechanism according to claim 5, characterized in that: A guide block (114) is further provided at the rear end of the middle cover plate (113); a V-shaped guide surface (114a) is provided on the side of the guide block (114) facing the front push head (12); the V-shaped guide surface (114a) is used to guide the garbage scraped backwards by the second scraper (122) to the lateral sides of the rear push head (11); And / or the front end of the middle cover plate (113) is also provided with a first guide groove (115), wherein the first guide groove (115) is used to receive the garbage swept forward by the second scraper (122) and guide the garbage to the lateral sides of the rear push head (11).

7. The multi-stage push head mechanism according to claim 2, characterized in that: The cylinder assembly (2) also includes a primary cylinder (21) for driving the rear push head (11) to move, the front end of the primary cylinder (21) is located below the first cover plate (111), the sliding guide groove (42) is arranged to penetrate front and back, and the rear end of the cylinder protective cover (3) can extend from the rear end of the first cover plate (111) and is used to cover the primary cylinder (21).

8. The multi-stage push head mechanism according to claim 7, characterized in that: The rear end of the first cover plate (111) is also provided with a third scraper (116) and a second guide groove (117), wherein the third scraper (116) is used to scrape the upper surface of the cylinder protective cover (3), and the second guide groove (117) is used to receive the garbage scraped by the third scraper (116) and guide the garbage to the lateral sides of the rear push head (11).

9. The multi-stage push head mechanism according to claim 2, characterized in that: The lower surface of the oil cylinder protective cover (3) is also provided with a wear-resistant sliding block, and the wear-resistant sliding block is used to abut against the groove wall of the sliding guide groove (42).

10. The multi-stage pusher mechanism according to any one of claims 1 to 9, characterized in that: The first cover plate (111) and the second cover plate (121) can be spliced ​​together when the front push head (12) and the rear push head (11) are combined, and the front end of the first cover plate (111) and the rear end of the second cover plate (121) are respectively provided with a splicing interface (43) for splicing, and the first lateral side edge (43a) and the second lateral side edge (43b) of the splicing interface (43) are staggered front and back.

11. The multi-stage pusher mechanism according to claim 10, characterized in that: A flexible sealing strip is also provided on the splicing interface (43).

12. The multi-stage pusher mechanism according to any one of claims 1 to 9, characterized in that: The upper surface of the oil cylinder protection cover (3) is a flow guiding inclined surface (31), and the flow guiding inclined surface (31) is inclined downward from the transverse center (31a) to the transverse edge (31b) to guide the flow.

13. A garbage compression device, characterized in that: The garbage compression device comprises a garbage compression box and a multi-stage push head mechanism according to any one of claims 1 to 12, wherein the multi-stage push head mechanism is arranged in the garbage compression box.

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