Crawler belt unit and crawler belt type cart

Abstract

The utility model provides a crawler unit and a crawler-type cart, which can also reduce the tension of a crawler, enable the crawler to circularly move more lightly and quickly and improve the driving performance of the crawler-type cart, and relates to the technical field of crawlers. A track unit includes a track and a frame, the track including a plurality of track links; a guide groove of a frame-shaped structure is formed in the periphery of the frame, a lateral groove which extends in the extending direction of the guide groove and is communicated with an inner cavity of the guide groove is formed in one of the left side wall and the right side wall of the guide groove, and at least one of the upper side and the lower side of the lateral groove is provided with a side wall remaining part. The crawler belt links are provided with first protruding parts which are opposite to openings of the lateral grooves in direction and are in sliding fit with the lateral grooves, the first protruding parts are provided with vertical protruding parts which are in sliding fit with inner cavities of the guide grooves, and the height of the vertical protruding parts is larger than the width of the lateral grooves.

Description

Technical Field

[0001] This utility model relates to the field of tracked vehicle technology, specifically a tracked unit and a tracked trolley. Background Technology

[0002] The track unit includes tracks and a mounting frame. The tracks circulate around multiple pulleys mounted on the frame in a rotatable manner. The tracks themselves consist of multiple track segments, which are sequentially connected by articulated structures or flexible belts to form a flexible track structure.

[0003] To achieve lightweight tracks and suitability for travel on rough roads, Japanese Patent JP2019142485A discloses a track unit and a handcart using it for rough terrain. The patent discloses a tracked walking device with a multi-pulley circulating track. The track includes multiple external attachments distributed in a strip on its outer periphery. Positioning recesses and positioning protrusions are respectively provided on the front and rear sides of adjacent external attachments. The positioning protrusions are embedded in the positioning recesses, creating a positioning constraint between adjacent external attachments. The patent also discloses a track comprising a belt with predetermined through holes and internal attachments. The external and internal attachments are combined by clamping the belt through the through holes, forming a track structure with multiple external attachments distributed in a strip on the outer periphery. In order to apply lateral force during turning and to make it difficult for the track to detach from the pulley, the patent also discloses: side portions protruding to both ends, the spacing of which is set to a width dimension W sufficient to accommodate and rotate the pulley mounted on the main body of the track unit. The side portions surround the side of the pulley, so the outer attachment (track) circulates around the side of the pulley, making it difficult for the track to detach from the pulley even when a lateral force is applied during turning.

[0004] To reduce track tension, facilitate smoother track circulation, and further improve the driving performance of tracked trolleys, patent application publication number CN115667060A discloses a track unit and a transport trolley for rough terrain using this track unit. The track unit includes a track that circulates around multiple pulleys mounted rotatably on a frame. The track is configured as a belt with multiple inner attachments inside the frame side. It includes flanges of guide rails protruding in the left-right direction from guide rails located on the outer periphery of the frame, and flanges of inner attachments protruding in the left-right direction from the inner attachments. These flanges are positioned such that one flange enters the space enclosed by the opposing flanges of one side, and the flanges of the two flanges overlap vertically, thus restricting the inner attachments along the guide rails while allowing the track to circulate around the pulleys. This patented structure ensures that the guide rail and inner attachment do not contact the track when it is in contact with the ground, thus preventing resistance. Interference between the guide rail and inner attachment only occurs when the track is lifted or when a force causing lateral shift or lifting is applied. In other words, the structure is designed to prevent obstruction during normal travel and to prevent sand or other debris from getting trapped, creating a shape that only interferes in the event of detachment, thus preventing the track from falling off. Utility Model Content

[0005] The technical problem to be solved by this utility model is to provide a track unit and a tracked trolley that can also reduce the tension of the track, make the track move more smoothly and cyclically, and improve the driving performance of the tracked trolley.

[0006] The technical solution adopted by this utility model to solve its technical problem is: a track unit, including a track and a frame, wherein the track is mounted on the frame by pulleys mounted on the frame so as to be able to rotate around the frame, and the track includes multiple track sections;

[0007] The outer periphery of the frame is provided with a frame-shaped guide groove. One of the left and right side walls of the guide groove has a lateral groove extending along the guide groove's extension direction and communicating with the inner cavity of the guide groove. At least one of the upper and lower sides of the lateral groove has a remaining side wall portion. The track link has a first protrusion facing opposite to the opening of the lateral groove and slidingly engaging with it. The first protrusion has a vertical protrusion slidingly engaging with the inner cavity of the guide groove. The height of the vertical protrusion is greater than the width of the lateral groove, and the relationship is set as follows:

[0008] As the track rotates around the frame, the first protrusion enters the lateral groove and slides into it, while the vertical protrusion enters the inner cavity of the guide groove and slides into it. The vertical protrusion also overlaps with the remaining portion of the sidewall in the left-right direction of the guide groove, thereby preventing the track from falling off.

[0009] Furthermore, the guide groove is only provided on the bottom edge of the outer periphery of the frame.

[0010] Furthermore, the guide groove and the frame are separate structures, and the guide groove and the frame are detachably connected.

[0011] Furthermore, the guide groove is detachably connected to the frame via a snap-fit ​​structure.

[0012] Furthermore, the guide groove includes at least two guide groove segments, which are detachably connected to the frame, and the guide groove segments are sequentially joined end to end to form the guide groove.

[0013] Furthermore, the track link includes an outer attachment and an inner attachment disposed inside the outer attachment, the inner attachment being engaged with the outer attachment, and the first protrusion being disposed on the inner attachment;

[0014] The track section is formed by a soft belt that is clamped and fixed between its outer and inner attachments.

[0015] A tracked trolley using a tracked unit as described above.

[0016] The beneficial effects of this utility model are: the track unit and tracked trolley of this utility model, by having the vertical protrusion overlap with the remaining part of the side wall of the guide groove in the left and right directions, can also reduce the tension of the track, making the track looser, making the track rotation smoother, and making its driving performance better. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the track unit structure of this utility model;

[0018] Figure 2 This is a schematic diagram showing the fit between the side groove and the first protrusion;

[0019] Figure 3 yes Figure 2 Enlarged view of point A;

[0020] Figure 4 This is a schematic diagram of the guide groove structure;

[0021] Figure 5 This is a schematic diagram of the guide groove being connected to the frame via a snap-fit ​​structure;

[0022] Figure 6 This is a structural diagram of a track link;

[0023] The figure shows: frame 1, track 2, large pulley 11, small pulley 12, shaft 13, guide groove 14, slot 15, connecting plate 16, track link 21, soft belt 22, lateral groove 141, remaining side wall portion 142, curved end 143, tongue 144, first protrusion 211, vertical protrusion 212, inner attachment 213, outer attachment 214, limiting portion 1441, groove 1442, locking piece 2131, protrusion 2132, side piece 2133, abutting side portion 2134, locking hole 2141, side portion 2142, limiting recess 2143. Detailed Implementation

[0024] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0025] like Figures 1 to 3 As shown, this utility model discloses a track unit comprising a track 2 and a frame 1. To facilitate frame 1 installation, a connecting plate 16 for connection to a trolley frame is provided on the frame 1. The track 2 is mounted on the frame 1 via pulleys, allowing it to rotate around the frame 1. The track 2 includes multiple track sections 21. Similar to existing structures, the track sections 21 can be sequentially connected via hinges or flexible belts to form a flexible track structure. Also similar to existing structures, the pulleys of this utility model include large pulleys 11 located at both ends of the frame 1 and small pulleys 12 located between the large pulleys 11. The large and small pulleys are respectively mounted on the frame 1 via shafts 13. The pulleys rotate freely by bearings rotatably engaging with their corresponding shafts.

[0026] To achieve the same effect of reducing track tension and making the track move more smoothly, thereby improving the driving performance of the tracked trolley, the outer periphery of the frame 1 of the track unit of this invention is provided with a guide groove 14 of a frame structure formed by upper, lower, left, and right side panels. The guide groove 14 can be a square frame structure or a trapezoidal structure, etc., preferably a square frame structure. One of the left and right side walls of the guide groove 14 is provided with a lateral groove 141 communicating with the inner cavity of the guide groove 14. The lateral groove 141 extends along the extension direction of the guide groove 14, and at least one of the upper and lower sides of the lateral groove 141 has a side wall remainder 142. Figure 3(The side of the lateral groove has a remaining sidewall portion). The track section 21 is provided with a first protrusion 211 that faces opposite to the opening of the lateral groove 141 and slides in cooperation with the lateral groove 141. The first protrusion 211 is provided with a vertical protrusion 212 that slides in cooperation with the inner cavity of the guide groove 14. The vertical protrusion 212 may protrude only to the lower side or the upper side of the first protrusion 211, or it may protrude to both the upper and lower sides simultaneously. In the figure, the vertical protrusion 212 protrudes to the lower side of the first protrusion 211. The height H of the vertical protrusion 212 is greater than the width B of the lateral groove 141, and is set as follows: during the rotation and movement of the track 2 around the frame 1, the first protrusion 211 enters the lateral groove 141 and slides into the lateral groove 141, the vertical protrusion 212 enters the inner cavity of the guide groove 14 and slides into the guide groove 14, and the vertical protrusion 212 overlaps with the remaining part 142 of the side wall in the left and right direction (width direction) of the guide groove 14, thereby restricting the track 2 and preventing it from falling off the frame 1 during movement.

[0027] by Figure 3 For example, if the lateral groove 141 is located on the left side wall of the guide groove 14, the opening of the lateral groove 141 faces left, and the first protrusion 211 faces the opposite direction to the opening of the lateral groove 141, that is, it protrudes to the right. Conversely, if the lateral groove 141 is located on the right side wall of the guide groove 14, the opening of the lateral groove 141 faces right, and the first protrusion 211 faces the opposite direction to the opening of the lateral groove 141, that is, it protrudes to the left.

[0028] During track movement, the first protrusion 211 and the lateral groove 141, as well as the vertical protrusion 212 and the guide groove 14, have certain gaps and will not interfere with each other. The track moves around the pulley in a circular motion by being restricted by the guide groove through its vertical protrusion 212. When a force is applied to the track in a lateral offset direction when lifting or turning, the height H of the vertical protrusion 212 is greater than the width B of the lateral groove 141. During the sliding engagement between the vertical protrusion 212 and the guide groove 14, the vertical protrusion 212 overlaps with the remaining part of the side wall 142 in the left and right directions of the guide groove 14. Thus, the vertical protrusion 212 cannot pass through the lateral groove 141 and is restricted within the guide groove 14, thereby restricting the track 2 and preventing it from falling off the frame 1 during movement. Therefore, in conventional track units, the track is tensioned in a non-slack manner by applying strong tension to prevent it from falling off. In this invention, since the possibility of the track falling off the frame is eliminated, the track tension can also be reduced compared to the past, making the track looser and the track rotation smoother, thus improving its driving performance.

[0029] See Figure 2 , Figure 5 In this utility model, the guide groove 14 is preferably provided only on the bottom edge of the outer periphery of the frame 1 to save costs and facilitate the movement of the tracks.

[0030] like Figure 5 As shown, similar to the guide rail of the existing track unit, in order to facilitate the vertical protrusion 212 entering the guide groove 14 and the first protrusion 211 entering the lateral groove 141, the two ends of the guide groove 14 can be provided with downwardly curved ends 143.

[0031] The guide channel 14 and the frame 1 can be an integral structure or separate structures. In this utility model, the guide channel 14 and the frame 1 are separate structures. When the guide channel 14 and the frame 1 are separate structures, preferably, the guide channel 14 and the frame 1 are detachably connected. Specifically, the guide channel 14 and the frame 1 can be connected by bolts, snap-fit, or other methods. Compared with non-detachable connections such as welding, the detachable connection of the guide channel 14 and the frame 1 facilitates replacement when the guide channel 14 is damaged. Among detachable connections, snap-fit ​​is preferred, as it facilitates quick disassembly and installation of the guide channel 14.

[0032] In this embodiment of the invention, the guide groove 14 is detachably connected to the frame 1 via a snap-fit ​​structure. The snap-fit ​​structure specifically includes at least one tongue 144 disposed on the wall panel of the guide groove 14, and a slot 15 disposed on the frame 1 corresponding to each tongue 144 and with a width adapted to the width of the corresponding tongue 144. Each tongue 144 has protruding limiting portions 1441 on both sides, and a groove 1442 on the tongue 144 to facilitate deformation during insertion. The tongue 144 is inserted into the corresponding slot 15 by elastic deformation, and the limiting portions 1441 on both sides engage with the slot 15 to prevent the tongue 144 from exiting, thereby creating mutual limiting and achieving a snap-fit ​​connection. In some embodiments, the tongue 144 is also disposed on the frame 1, and the slot 15 is disposed on the wall panel of the guide groove 14.

[0033] The slot 15 can be composed of one or at least two segments. Especially when the guide groove 14 is detachably connected to the frame 1, preferably, as shown below... Figure 5 As shown, the guide groove 14 includes at least two guide groove sections, which are detachably connected to the frame 1. The guide groove sections abut each other sequentially to form the guide groove 14. In this way, when part of the guide groove 14 is damaged, only the damaged part of the guide groove section needs to be replaced, which can save costs.

[0034] like Figure 3 and Figure 6As shown, in this utility model embodiment, the track link structure is the same as that in application publication number CN115667060A. The track link 21 includes an outer attachment 214 and an inner attachment 213 disposed inside the outer attachment 214. The inner attachment 213 is engaged with the outer attachment 2144 by a locking piece 2131 disposed thereon and a locking hole 2141 disposed thereon, thereby locking and fixing it on the outer attachment 214. The first protrusion 211 is disposed on the inner attachment 213. The track link 21 is connected to the outer attachment 214 and the inner attachment 213 by a soft belt 22 clamping and fixing it between the outer attachment 214 and the inner attachment 213. The soft belt 22 is clamped and fixed between the outer attachment 214 and the inner attachment 213 by a through hole thereon and a protrusion 2132 disposed on the inner attachment 213 or the outer attachment 214.

[0035] When the track link 21 is composed of an outer attachment 214 and an inner attachment 213 disposed inside the outer attachment 214, the outer attachment of this utility model embodiment has the same structure as the existing inner attachment. The outer attachment has protruding side portions 2142 on both sides. A limiting recess 2143 is provided on one of the adjacent front and rear sides of the plurality of outer attachments, and a limiting protrusion is provided on the other side. The limiting protrusion enters the limiting recess, and the outer attachments are positioned and limited by each other (see application CN115667060A for details).

[0036] Similar to the existing inner attachment structure, in this embodiment of the utility model, the inner attachment 213 is provided with side plates 2133 on the left and right sides, with pulleys rotating on the upper surface. The inner attachment is provided with abutting side portions 2134 at the front and rear ends, which abut against the adjacent inner attachments. The inner attachments of adjacent inner attachments abut against each other through the abutting side portions 2134, so as to avoid the rollers falling into the gap and causing collision due to the gap between adjacent inner attachments, and to reduce the noise during the track movement.

[0037] This utility model also provides a tracked trolley, which uses the track unit described above. The track unit is mounted on the trolley frame via a connecting plate 16.

Claims

1. A track unit comprising a track (2) and a frame (1), the track (2) being mounted on the frame (1) via pulleys mounted on the frame (1) to be rotatable about the frame (1), the track (2) comprising a plurality of track segments (21), characterized in that: The outer periphery of the frame (1) is provided with a frame-shaped guide groove (14). One side wall of the guide groove (14) has a lateral groove (141) extending along the extension direction of the guide groove (14) and communicating with the inner cavity of the guide groove (14). At least one side of the upper and lower sides of the lateral groove (141) has a remaining side wall portion (142). The track link (21) has a first protrusion (211) facing opposite to the opening of the lateral groove (141) and slidingly engaging with the lateral groove (141). The first protrusion (211) has a vertical protrusion (212) slidingly engaging with the inner cavity of the guide groove (14). The height of the vertical protrusion (212) is greater than the width of the lateral groove (141), and the relationship is set as follows: During the rotation and movement of the track (2) around the frame (1), the first protrusion (211) enters the side groove (141) and slides into the side groove (141), and the vertical protrusion (212) enters the inner cavity of the guide groove (14) and slides into the guide groove (14). The vertical protrusion (212) overlaps with the remaining part of the side wall (142) in the left and right direction of the guide groove (14), thereby preventing the track (2) from falling off.

2. The track unit as described in claim 1, characterized in that: The guide groove (14) is only provided on the outer periphery of the frame (1).

3. A track unit as described in claim 1 or 2, characterized in that: The guide groove (14) and the frame (1) are separate structures, and the guide groove (14) and the frame (1) are detachably connected.

4. A track unit as described in claim 3, characterized in that: The guide groove (14) is detachably connected to the frame (1) via a snap-fit ​​structure.

5. A track unit as described in claim 3, characterized in that: The guide groove (14) includes at least two guide groove sections, which are detachably connected to the frame (1) respectively, and the guide groove sections are connected end to end to form the guide groove (14).

6. A tracked unit as described in claim 1, characterized in that: The track section (21) includes an outer attachment (214) and an inner attachment (213) disposed inside the outer attachment (214). The inner attachment (213) is engaged with the outer attachment (214), and the first protrusion (211) is disposed on the inner attachment (213). The track section (21) is connected to form the track (2) by a soft strap (22) that clamps and fixes between its outer attachment (214) and inner attachment (213).

7. A tracked trolley, characterized in that: Use a track unit as described in any one of claims 1 to 6.

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