A cleaning machine

Abstract

The application relates to a cleaning machine facilitating steering. The cleaning machine comprises a chassis, rear rollers connected to the left and right sides of the rear end of the chassis, a cavity with an open lower end arranged at the middle of the front end of the chassis, a front wheel assembly connected to the cavity, the front wheel assembly comprising a fixed shaft and a front wheel rotationally connected to the fixed shaft, one of the left and right side walls of the cavity being provided with a receiving hole for accommodating one end of the fixed shaft, the fixed shaft being capable of rotating forward and backward relative to the receiving hole, the other side wall being provided with a waist-shaped slot, the two ends of the waist-shaped slot being semicircular holes with diameters equal to the diameter of the fixed shaft, the other end of the fixed shaft being inserted into the waist-shaped slot, and the fixed shaft being in the left and right directions when the two ends of the fixed shaft are located at the receiving hole and the rear end of the waist-shaped slot respectively. The application is characterized in that the receiving hole and the waist-shaped slot are arranged at the left and right sides of the cavity respectively, the fixed shaft can rotate, the front wheel can be directionally adjusted, the rear rollers can avoid rotating in place, and the damage to the carpet is reduced.

Description

Technical Field

[0001] This invention relates to the field of cleaning machine technology, and more particularly to a cleaning machine that is easy to maneuver. Background Technology

[0002] Cleaning machines, as cleaning aids, are widely used; various cleaning machines are available on the market. However, due to the still-developing artificial intelligence in cleaning machines, they are currently mainly operated manually, as shown in the attached document. Figure 1 The cleaning machine shown is generally used to clean carpeted floors and is driven by manual pushing. When turning, it is manually rotated sideways. In this way, a pulley located at the rear rotates in place, which causes sliding friction between the pulley and the carpet, resulting in some damage to the carpet. The applicant examined some other cleaning machines and found that when the cleaning machine turns, at least one pulley always needs to rotate in place, inevitably causing sliding friction with the carpet. When the cleaning machine is heavy, the damage to the carpet is significant, and the carpet surface will be worn down. Summary of the Invention

[0003] To address the problems existing in the prior art, this invention provides a cleaning machine that avoids sliding friction with the carpet when turning, thereby reducing damage to the carpet.

[0004] The technical solution adopted in this invention is as follows: A cleaning machine includes a chassis with rear rollers connected to the left and right rear ends of the chassis. A cavity with an open lower end is located at the center of the front end of the chassis plate. A front wheel assembly is connected to the cavity, which includes a fixed shaft and a front wheel rotatably connected to the fixed shaft. One side wall of the cavity has a receiving hole for accommodating one end of the fixed shaft, and the fixed shaft can rotate back and forth relative to the receiving hole. The other side wall has a waist-shaped groove with semi-circular holes at both ends. The diameter of the semi-circular holes is equal to the diameter of the fixed shaft. The other end of the fixed shaft is inserted into the waist-shaped groove. When both ends of the fixed shaft are located at the rear ends of the receiving hole and the waist-shaped groove, respectively, the fixed shaft is in a left-right direction.

[0005] Furthermore, the width of the receiving hole is greater than the diameter of the fixed shaft, and the two ends of the fixed shaft are respectively connected to limit nuts. The side plate where the other side wall is located is a secondary side plate, and the outer surface of the secondary side plate is provided with an arc surface corresponding to the rotation trajectory of the corresponding limit nut. The side plate where the receiving hole is located is a primary side plate, and one end of the fixed shaft extends out of the primary side plate and is fitted with a spring. The two ends of the spring abut against the primary side plate and the corresponding limit nut, respectively.

[0006] Furthermore, the width of the receiving hole is greater than the diameter of the fixed shaft, the side plate containing the other side wall is a secondary side plate, the other end of the fixed shaft is connected to a limit nut, and the inner side of the secondary side plate is provided with an arc surface corresponding to the rotation trajectory of the corresponding limit nut; the side plate containing the receiving hole is a primary side plate, the outer side of the primary side plate is provided with a baffle connected to the cavity, one end of the fixed shaft is connected to a connecting sleeve, one end of the connecting sleeve is connected to the fixed shaft, the outer end of the connecting sleeve is spherical, and the inner side of the baffle is provided with a concave hole that mates with the outer end; the outer end of the connecting sleeve is inserted into the concave hole and abuts against the bottom surface of the concave hole.

[0007] Preferably, one end of the connecting sleeve is provided with a collar, which is sleeved with the fixed shaft and subjected to an interference fit or fit.

[0008] Preferably, one end of the connecting sleeve is provided with a threaded tube, and one end of the fixed shaft is provided with an external thread, and the threaded tube is threadedly connected to the fixed shaft.

[0009] More preferably, the side of the collar is provided with a fastening hole, and a fastener is connected to the fastening hole.

[0010] Furthermore, the fixed shaft is connected to a limiting rod, and the upper bottom plate of the cavity is provided with an arc-shaped groove, into which the upper end of the limiting rod extends.

[0011] The beneficial effects of the present invention are as follows: By setting receiving holes and waist-shaped holes on both sides of the cavity, the fixed shaft can rotate and the front wheel can be directionally adjusted, thereby preventing the rear roller from rotating in place and reducing damage to the carpet. Attached Figure Description

[0012] Figure 1 This is a schematic diagram of a structure of an existing cleaning machine.

[0013] Figure 2 This is a schematic diagram of a chassis structure.

[0014] Figure 3 This is a schematic diagram showing the fit between the cavity and the front wheel assembly.

[0015] Figure 4 for Figure 3 Another perspective illustration.

[0016] Figure 5 This is a second schematic diagram showing the fit between the cavity and the front wheel assembly.

[0017] Figure 6 for Figure 5 Another perspective illustration.

[0018] Figure 7 for Figure 5 A schematic diagram of its decomposition.

[0019] The reference numerals in the figures include: 1—Chassis; 2—Rear roller; 3—Cavity; 4—Oval groove; 5—Front wheel; 6—Fixed shaft; 7—Accommodation hole; 8—Main side plate; 9—Spring; 11—Secondary side plate; 12—Limit nut; 13—Arc surface; 14—Collar ring; 15—Connecting sleeve; 16—Baffle; 17—Fastener; 18—Arc surface; 19—Concave hole. Detailed Implementation

[0020] The invention will now be described in detail with reference to the accompanying drawings. Figures 2 to 7 As shown.

[0021] Example 1: A cleaning machine includes a chassis 1, with rear rollers 2 connected to the left and right sides of the rear end of the chassis 1 respectively. A cavity 3 with an opening at the lower end is provided in the middle of the front end of the base plate. The cavity 3 is connected to a front wheel assembly, which includes a fixed shaft 6 and a front wheel 5 rotatably connected to the fixed shaft 6. One side wall of the left and right side walls of the cavity 3 is provided with a receiving hole 7 for accommodating one end of the fixed shaft 6, and the fixed shaft 6 can rotate back and forth relative to the receiving hole 7. The other side wall is provided with a waist-shaped groove 4, with semi-circular holes at both ends of the waist-shaped groove 4. The diameter of the semi-circular holes is equal to the diameter of the fixed shaft 6. The other end of the fixed shaft 6 is inserted into the waist-shaped groove 4. When the two ends of the fixed shaft 6 are respectively located at the rear end of the receiving hole 7 and the waist-shaped groove 4, the fixed shaft 6 is in the left-right direction.

[0022] The cleaning machine in this technical solution is mainly a manual push type. When working, the cleaning machine is pushed forward by the operator. During the forward movement, the front wheel 5 is subjected to frictional resistance from the ground. This frictional resistance is opposite to the direction of movement of the cleaning machine, that is, the ground exerts a backward force on the front wheel assembly. Since one end of the fixed shaft 6 can swing relative to the receiving hole 7, and the other end of the fixed shaft 6 is located in the waist-shaped groove 4 and can move relative to the waist-shaped groove 4, under the action of the ground frictional resistance, both ends of the fixed shaft 6 move backward respectively, with one end located at the rear end of the receiving hole 7 and the other end located at the rear end of the waist-shaped groove 4. At this time, the fixed shaft 6 is in the left-right direction and is perpendicular to the direction of movement of the cleaning machine. The direction of movement of the front wheel 5 is straight forward, and the direction of movement of the front wheel 5 is consistent with the front-back direction of the cleaning machine. The cleaning machine can move forward in a positive direction.

[0023] When the cleaning machine needs to be turned, the operator can drag it backward. Under the friction of the ground, the fixed shaft 6 moves forward. One end of the fixed shaft 6 moves to the front end of the receiving hole 7, while the other end moves forward within the oblong groove 4. Because the two ends of the fixed shaft 6 move different distances—the other end moves much further than the first end—the fixed shaft 6 rotates. This causes the front wheel 5 to move at an angle to the front-back direction of the cleaning machine, and the entire cleaning machine rotates under the guidance of the front wheel 5. When the cleaning machine rotates to the desired direction, it propels the machine forward. Under the friction of the ground, both ends of the fixed shaft 6 move towards the rear end of the receiving hole 7 and the oblong groove 4. The length direction of the fixed shaft 6 is perpendicular to the front-back direction of the cleaning machine, propelling it forward in a straight line. During the adjustment process, because the fixed shaft 6 is rotatably connected to the front wheel 5, the front wheel 5 maintains a constant rotation relative to the fixed shaft 6. The fixed shaft 6 can be rotatably connected to the front wheel 5 via bearings; this is existing technology and will not be elaborated further.

[0024] Of course, when the cleaning machine changes its movement from backward to forward, since the forward direction of the front wheel 5 is not consistent with the front-back direction of the cleaning machine, the cleaning machine can be moved backward a short distance before moving forward to correct this deviation. This deviation can be corrected through multiple fine adjustments, i.e., multiple small-distance backward and forward movements. The adjusted direction can be within the error range. During the adjustment process, although the fixed shaft 6 rotates, the front wheel 5 still rotates relative to the fixed shaft 6 due to the friction of the ground; that is, the front wheel 5 is constantly rotating during the adjustment process. There is virtually no sliding friction between the front wheel 5 and the carpet, which can reduce damage to the carpet. At the same time, the structure is relatively simple and the cost is low. The front wheel can be connected to the fixed shaft 6 through a bearing.

[0025] See Figure 3 , Figure 4 Furthermore, the width of the receiving hole 7 is greater than the diameter of the fixed shaft 6, and the two ends of the fixed shaft 6 are respectively connected to the limiting nuts 12. The side plate where the other side wall is located is a secondary side plate 11. The outer surface of the secondary side plate 11 is provided with an arc surface 13 corresponding to the rotation trajectory of the corresponding limiting nut 12. The side plate where the receiving hole 7 is located is a main side plate 8. One end of the fixed shaft 6 extends out of the main side plate 8 and is fitted with a spring 9. The two ends of the spring 9 abut against the main side plate 8 and the corresponding limiting nut 12, respectively.

[0026] To facilitate the rotation of the fixed shaft 6 when the cleaning machine retracts, the width of the receiving hole 7 in the front-to-back direction is set to be larger than the diameter of the fixed shaft 6, allowing the fixed shaft 6 to rotate back and forth relative to the receiving hole 7. Secondly, when the fixed shaft 6 rotates, the limiting nut 12 connected to the other end of the fixed shaft 6 also rotates. With the arc surface 13 provided, the limiting nut 12 rotates along the arc surface 13, thus limiting the movement of the fixed shaft 6. Furthermore, a spring 9 is sleeved on one end of the fixed shaft 6, and a gap is maintained between the limiting nut 12 connected to this end and the adjacent side plate. When the fixed shaft 6 rotates, the limiting nut 12 will not abut against the adjacent side plate, allowing for flexible rotation. Simultaneously, the spring 9 and the limiting nut 12 at the other end ensure that the fixed shaft 6 does not experience significant displacement during rotation, maintaining the stability of the fixed shaft 6 during operation.

[0027] See Figure 5 , Figure 6 , Figure 7 As another type of fit, the width of the receiving hole 7 is greater than the diameter of the fixed shaft 6. The side plate where the other side wall is located is a secondary side plate 11. The other end of the fixed shaft 6 is connected to a limiting nut 12. The inner side surface of the secondary side plate 11 is provided with an arc surface 18 corresponding to the rotation trajectory of the corresponding limiting nut 12. The side plate where the receiving hole 7 is located is a main side plate 8. The outer side of the main side plate 8 is provided with a baffle 16 connected to the cavity 3. One end of the fixed shaft 6 is connected to a connecting sleeve 15. One end of the connecting sleeve 15 is connected to the fixed shaft 6. The outer end of the connecting sleeve 15 is spherical. The inner side surface of the baffle 16 is provided with a concave hole 19 that mates with the outer end. The outer end of the connecting sleeve 15 is inserted into the concave hole 19 and abuts against the bottom surface of the concave hole 19.

[0028] The baffle 16 and the recess 19 are provided so that when the fixed shaft 6 rotates, its axis rotates horizontally with the outer end vertex of the connecting sleeve 15 as the axis, thus limiting the rotation trajectory of the fixed shaft 6. Simultaneously, the baffle 16 cooperates with the limiting nut 12 to prevent the fixed shaft 6 from moving left or right. The bottom surface of the recess 19 is part of a sphere.

[0029] Preferably, one end of the connecting sleeve 15 is provided with a collar 14, which is sleeved with the fixed shaft 6 and subjected to an interference fit or fit.

[0030] The connecting sleeve 15 is connected to the fixed shaft 6 through the collar 14 and is fixedly connected to the fixed shaft 6 through a hard fit or other means.

[0031] Preferably, one end of the connecting sleeve 15 is provided with a threaded tube, and one end of the fixed shaft 6 is provided with an external thread, and the threaded tube is threadedly connected to the fixed shaft 6.

[0032] The connecting sleeve 15 is connected to the fixed shaft 6 via a threaded connection, which facilitates disassembly.

[0033] More preferably, the side of the collar 14 is provided with a fastening hole, and the fastening hole is connected to a fastener 17.

[0034] To prevent the connecting sleeve 15 from detaching from the fixed shaft 6 during operation, the collar 14 is also provided with a fastening hole, which can be a threaded through hole, and the fastener 17 is a screw. The screw abuts against the fixed shaft 6.

[0035] Furthermore, the fixed shaft 6 is connected to a limiting rod (not shown in the figure), and the upper bottom plate of the cavity 3 is provided with an arc-shaped groove, the upper end of which extends into the arc-shaped groove (not shown in the figure).

[0036] By setting a limiting rod and an arc-shaped groove, the movement trajectory of the fixed shaft 6 is restricted, and left and right movement of the fixed shaft 6 is also prevented. In specific settings, the fixed shaft 6 is provided with a threaded through hole, the limiting rod is threadedly connected to the fixed shaft 6, and the upper end of the limiting rod extends into the arc-shaped groove.

[0037] The above description is only a preferred embodiment of the invention. For those skilled in the art, there will be changes in the specific implementation and application scope based on the inventive concept. The content of this specification should not be construed as a limitation of the invention. In addition to being used in cleaning machines, the support structure can also be used in other machines or devices.

Claims

1. A cleaning machine, comprising a chassis, with rear rollers connected to the left and right rear ends of the chassis respectively, and a cavity with an open lower end provided at the center of the front end of the base plate, the cavity being connected to a front wheel assembly, the front wheel assembly comprising a fixed shaft and a front wheel rotatably connected to the fixed shaft, characterized in that: One of the two side walls of the cavity is provided with a receiving hole for accommodating one end of the fixed shaft, and the fixed shaft can rotate back and forth relative to the receiving hole; the other side wall is provided with an oblong groove, the two ends of which are semi-circular holes with the same diameter as the fixed shaft. The other end of the fixed shaft is inserted into the oblong groove. When the two ends of the fixed shaft are respectively located at the rear end of the receiving hole and the oblong groove, the fixed shaft is in the left-right direction.

2. The cleaning machine according to claim 1, characterized in that: The width of the receiving hole is greater than the diameter of the fixed shaft. The two ends of the fixed shaft are respectively connected to limit nuts. The side plate where the other side wall is located is a secondary side plate. The outer surface of the secondary side plate is provided with an arc surface corresponding to the rotation trajectory of the corresponding limit nut. The side plate where the receiving hole is located is a primary side plate. One end of the fixed shaft extends out of the primary side plate and is fitted with a spring. The two ends of the spring abut against the primary side plate and the corresponding limit nut, respectively.

3. A cleaning machine according to claim 1, characterized in that: The width of the receiving hole is greater than the diameter of the fixed shaft. The side plate containing the other side wall is a secondary side plate. The other end of the fixed shaft is connected to a limit nut. The inner side of the secondary side plate is provided with an arc surface corresponding to the rotation trajectory of the corresponding limit nut. The side plate containing the receiving hole is a primary side plate. The outer side of the primary side plate is provided with a baffle connected to the cavity. One end of the fixed shaft is connected to a connecting sleeve. One end of the connecting sleeve is connected to the fixed shaft. The outer end of the connecting sleeve is spherical. The inner side of the baffle is provided with a concave hole that mates with the outer end. The outer end of the connecting sleeve is inserted into the concave hole and abuts against the bottom surface of the concave hole.

4. A cleaning machine according to claim 3, characterized in that: One end of the connecting sleeve is provided with a collar, which is sleeved with the fixed shaft and has an interference fit or fit.

5. A cleaning machine according to claim 3, characterized in that: One end of the connecting sleeve is provided with a threaded tube, and one end of the fixed shaft is provided with an external thread. The threaded tube is threadedly connected to the fixed shaft.

6. A cleaning machine according to claim 4, characterized in that: The collar has fastening holes on its side, and fasteners are connected to the fastening holes.

7. A cleaning machine according to any one of claims 1 to 5, characterized in that: The fixed shaft is connected to a limiting rod, and the upper bottom plate of the cavity is provided with an arc-shaped groove, into which the upper end of the limiting rod extends.

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