Roller supporting device

Abstract

A roller supporting device comprises a base, a roller carrier, two fixing units and a conveying unit. The wheel carrier comprises a base arranged on the base and two side plates which extend upwards from the base and are spaced in the left-right direction. Each fixing unit can move relative to the side plate in the vertical direction. The conveying unit is arranged between the fixing units and comprises a roller extending in the left-right direction. Each fixing unit can move relative to the side plate in the vertical direction, so that a user can quickly and conveniently adjust the height and the level of the roller.

Description

Technical Field

[0001] The utility model relates to a supporting device, in particular to a roller supporting device for supporting wood to be planed. Background Art

[0002] An existing wood planer includes a platform and a planing device arranged on the platform. A user can place a piece of wood on the platform and push it to plan the wood.

[0003] However, the platform length of the planer is fixed. When the length of the wood is long, the entire wood cannot be placed on the platform, resulting in a large portion of the wood protruding from the platform. Not only is it difficult to apply force when pushing the wood, thus reducing work efficiency, but it also affects the quality of planing. Utility Model Content

[0004] The purpose of the utility model is to provide a roller supporting device which can improve at least one disadvantage of the above-mentioned background technology.

[0005] The utility model roller support device comprises a base, a wheel frame, two fixing units, and a conveying unit, wherein the wheel frame comprises a pedestal arranged on the base, and two side plates extending upward from the pedestal and spaced apart along the left-right direction, the fixing units are respectively arranged on the side plates and can move relative to the side plates along the up-down direction, the conveying unit is arranged between the fixing units and comprises a roller extending along the left-right direction, and the roller can rotate around a central axis extending along the left-right direction.

[0006] The roller support device of the utility model is characterized in that each of the side plates defines a central opening around the central axis, and each of the side plates is formed with a first adjustment hole extending in the up-down direction, and each of the fixing units can loosely clamp the corresponding side plates along the left-right direction, and each of the fixing units includes a first clamping plate defining a first opening around the central axis, a second clamping plate defining a second opening around the central axis and cooperating with the first clamping plate to clamp the corresponding side plates along the left-right direction, an axle seat defining an installation space around the second opening and connected to the second clamping plate, and a first screw, each of the first clamping plates is formed with a first screw facing the corresponding side plates A first through hole corresponding to the first adjustment hole is formed on each of the second clamping plates, facing the first adjustment hole corresponding to the respective one, and each of the first screws passes through the first through hole corresponding to the respective one and the first adjustment hole corresponding to the respective one and can be loosely screwed in the first through hole corresponding to the respective one, and the conveying unit also includes two bearings respectively arranged in the installation space, and two rotating shafts respectively arranged on the bearings and respectively connected to the two ends of the roller, when each of the first screws is not completely locked, the first clamping plate and the second clamping plate of each of the fixing units can drive the first screw corresponding to the respective one to move up and down along the first adjustment hole corresponding to the respective one.

[0007] In the roller supporting device of the utility model, each of the first clamping plates is located between the corresponding side plate and the roller, and each of the shaft seats extends into the corresponding central opening and the corresponding first opening.

[0008] The roller support device of the utility model is characterized in that each of the central openings extends downward from the top surface of the corresponding side plate, and each of the first adjustment holes extends downward from the bottom of the corresponding central opening, and each of the side plates is also formed with two second adjustment holes extending along the up-down direction and located on the two opposite sides of the corresponding central opening along the front-back direction, and each of the first clamping plates is also formed with two second through holes respectively facing the second adjustment holes of the corresponding side plates, and each of the second clamping plates is also formed with two second through holes respectively facing the second adjustment holes of the corresponding side plates, and each of the fixing units also includes two second screws, each of the second screws passes through the corresponding second through hole and the corresponding second adjustment hole and can be loosely screwed in the corresponding second through hole, and when each of the first screws and each of the second screws are not completely locked, the first clamping plate and the second clamping plate of each of the fixing units can drive the corresponding first screw and the second screw to move up and down along the corresponding first adjustment hole and the second adjustment hole respectively.

[0009] In the roller support device of the utility model, each of the fixing units also includes a side washer group that is sleeved with the first screw and located between the side plate and the first clamping plate, and each of the side washer groups has a flat washer that rests against the side plate, and a wave washer that rests between the flat washer and the first clamping plate.

[0010] The roller support device of the utility model has two through holes respectively adjacent to the side plates, each of the fixing units also includes an extension plate connected to the first clamping plate, each of the extension plates has a screw hole extending through the upper and lower directions, and the roller support device also includes two adjustment units, each of the adjustment units includes an adjustment screw extending into the corresponding through hole, and a locking nut screwed into the adjustment screw and located between the base and the extension plate, and each of the adjustment screws is screwed into the corresponding screw hole of the extension plate.

[0011] The roller support device of the utility model comprises a base including a first support leg and a second support leg, the first support leg having a first cross bar, a first support rod extending upward from the middle of the first cross bar, and a pivot member arranged on the first support rod, the second support leg is pivotally connected to the pivot member, the first support rod has an outer tube pivotally connected to the second support leg, an inner tube movably inserted into the outer tube, and a tightening member capable of loosely clamping the outer tube and the inner tube.

[0012] The roller support device of the utility model, the base also has two through holes respectively adjacent to the side plates, each of the side plates defines a central opening around the central axis, and each of the side plates is formed with a first adjustment hole extending in the up-down direction, each of the fixing units can loosely clamp the corresponding side plates along the left-right direction, each of the fixing units includes a first clamping plate around the central axis, a second clamping plate around the central axis and cooperating with the first clamping plate to clamp the corresponding side plates along the left-right direction, an axle seat around the central axis defining an installation space and connecting the second clamping plate, and a first screw, each of the first clamping plates is formed with the first adjustment hole facing the corresponding first adjustment hole The invention relates to a first through hole of the hole, and each of the second clamping plates forms a first through hole facing the respectively corresponding first adjustment hole, and each of the first screws passes through the respectively corresponding first through hole and the respectively corresponding first adjustment hole and can be loosely screwed in the respectively corresponding first through hole, and the conveying unit also includes two bearings respectively arranged in the installation space, and two rotating shafts respectively arranged on the bearings and respectively connected to the two ends of the roller, and the roller support device also includes two adjustment units, each of the adjustment units includes an adjustment screw extending into the respectively corresponding through hole and abutting against the respectively corresponding shaft seat, and a fixing nut screwed on the adjustment screw, connected to the base and located between the base and the shaft seat.

[0013] The roller support device of the utility model, the wheel frame also includes two guide members respectively arranged on the side plates, each of the guide members has a mounting plate arranged on the corresponding side plate, and a guide plate rotatably arranged on the mounting plate, each of the guide plates extends along the up and down directions, each of the guide plates can rotate relative to the roller and change between a blocking position and a non-blocking position, when each of the guide plates is located at the blocking position, it protrudes upward relative to the roller along the up and down direction, and when each of the guide plates is located at the non-blocking position, it does not protrude upward relative to the roller along the up and down direction.

[0014] In the roller supporting device of the utility model, each of the side plates has a stopper extending forward along the front-rear direction, and when each of the guide plates is located at the stopper position, it abuts against the corresponding stopper along the left-right direction.

[0015] The beneficial effect of the utility model is that each of the fixing units can move relative to the side plate along the up-down direction, so that the user can quickly and conveniently adjust the height and level of the drum. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a three-dimensional combination diagram of the first embodiment of the roller support device of the utility model;

[0017] Figure 2 is a fragmentary front view of the first embodiment, showing the guide plate in a blocking position;

[0018] Figure 3 is a partial enlarged view of the first embodiment viewed from another angle;

[0019] Figure 4 is an incomplete partial three-dimensional exploded view of one of the fixing units of the first embodiment;

[0020] Figure 5 is a cross-sectional view of one of the fixing units of the first embodiment;

[0021] Figure 6 is an incomplete three-dimensional diagram showing three side gasket groups of one of the fixing units of the first embodiment;

[0022] Figure 7 is similar Figure 3 A view showing a first support rod of a base of the first embodiment being extended;

[0023] Figure 8 is a schematic diagram illustrating a log abutting against a roller of the first embodiment and being pushed into a planer;

[0024] Fig. 9 is similar Figure 2 , showing that the guide plate is in a non-blocking position;

[0025] Fig.10 It is an incomplete cross-sectional view of a fixing unit of a second embodiment of the roller supporting device of the utility model. DETAILED DESCRIPTION

[0026] The present invention will be described in detail below in conjunction with the accompanying drawings and embodiments. Before the present invention is described in detail, it should be noted that similar components are represented by the same reference numerals in the following description.

[0027] See also Figure 1 and Figure 2 The first embodiment of the roller supporting device of the utility model comprises a base 1, a wheel frame 2, two fixing units 3, two adjusting units 4, and a conveying unit 5.

[0028] The base 1 includes a first support leg 11 and a second support leg 12 located in front of the first support leg 11 along the front-to-back direction Y. The first support leg 11 has a first crossbar 111 extending along the left-right direction X perpendicular to the front-to-back direction Y, a first support rod 112 extending upward from the middle of the first crossbar 111, and a pivot member 113 disposed on the first support rod 112.

[0029] The first support rod 112 has an outer tube 114 extending upward from the first crossbar 111 and pivotally connected to the second support leg 12 through the pivot member 113, an inner tube 115 movably inserted into the outer tube 114, and a tightening member 116. The tightening member 116 is a tube clamp that can loosely clamp the outer tube 114 and the inner tube 115.

[0030] See also Figure 1 and Figure 3 The pivot member 113 is a pipe clamp. The pivot member 113 has a bent portion 117 connected to the outer tube 114 of the first support rod 112 in a surrounding manner, and two plate portions 118 connected to the two opposite ends of the bent portion 117 along the left-right direction X.

[0031] The second support leg 12 is a rod pivotally connected to the plate portion 118. Therefore, the second support leg 12 can rotate relative to the first support leg 11 about an axis (not shown) extending along the left-right direction X.

[0032] It should be noted that, since the conveying unit 5 has the same structure as the wheel frame 2 at both ends along the left-right direction X, the structure of the adjustment unit 4 is also the same. Figures 4 to 6 Only the combined structure of the conveying unit 5 and one side of the wheel frame 2 and the structure of one of the adjustment units 4 are described.

[0033] See also Figures 2 to 4 The wheel frame 2 includes a base 21 arranged on the inner tube 115 of the first support rod 112, two side plates 22 extending upward from the base 21 and spaced apart along the left-right direction X, and two guide members 23 respectively arranged on the side plates 22.

[0034] See also Figure 2 , Figure 4 ,and Figure 5 The base 21 extends along the left-right direction X and is connected between the side plates 22. The base 21 has two through holes 211 penetrating along an up-down direction Z perpendicular to the front-back direction Y and the left-right direction X and adjacent to the side plates 22 respectively.

[0035] Each of the side panels 22 defines a central opening 221 around a central axis L extending along the left-right direction X. Each of the central openings 221 extends downward from a top surface of the corresponding side panel 22 .

[0036] A first adjustment hole 222 extending along the up-down direction Z and penetrating along the left-right direction X, and two second adjustment holes 223 are formed on each of the side plates 22. The first adjustment hole 222 of each of the side plates 22 extends downward from the bottom of the corresponding central opening 221. The second adjustment hole 223 of each of the side plates 22 is located at two opposite sides of the corresponding central opening 221 along the front-back direction Y and is adjacent to the top surface.

[0037] Each of the side plates 22 has a stopper 224 extending forward along the front-rear direction Y.

[0038] Each of the guide members 23 has a mounting plate 231 , a guide plate 232 , a fixing screw hole 233 formed in the mounting plate 231 , and a locking screw 234 .

[0039] The mounting plate 231 extends from the front side of the corresponding side plate 22 toward the other side plate 22. The guide plate 232 is disposed at the front side of the mounting plate 231 and extends along the up-down direction Z.

[0040] Each locking screw 234 passes through the corresponding guide plate 232 along the front-to-back direction Y and is screwed into the fixing screw hole 233 on the corresponding mounting plate 231, so that each guide plate 232 is tightly pressed between the corresponding locking screw 234 and the corresponding mounting plate 231.

[0041] See also Figures 3 to 5 , the fixing units 3 are respectively arranged on the side plates 22. Each of the fixing units 3 includes a first clamping plate 31 defining a first opening 311 around the central axis L, a second clamping plate 32 defining a second opening 321 around the central axis L, an extension plate 33 connected to the first clamping plate 31 and located above the corresponding adjustment screw 41, an axle seat 34 defining an installation space 341 around the second opening 321 and connected to the second clamping plate 32, a first screw 35, two second screws 36, three side washers 37, and three locking nuts 38. It should be noted that the first screw 35 and the second screw 36 are screws with the same structure, and in this embodiment, the two are defined as different names for the convenience of description.

[0042] Each of the first clamping plates 31 is located on a side of the corresponding side plate 22 adjacent to the base 21. Each of the first clamping plates 31 is formed with a first through hole 312 facing the corresponding first adjustment hole 222, and two second through holes 313 facing the corresponding second adjustment holes 223 of the side plate 22. The first through hole 312 and the second through hole 313 of each of the first clamping plates 31 surround the corresponding first opening 311. Each of the extension plates 33 is connected to the bottom of the corresponding first clamping plate 31 and extends in a direction away from the corresponding side plate 22. Each of the extension plates 33 has a screw hole 331 penetrating along the up-down direction Z.

[0043] Each of the second clamping plates 32 is located on a side of the first clamping plate 31 opposite to the corresponding side plate 22. Each of the second clamping plates 32 cooperates with the first clamping plate 31 to clamp the corresponding side plate 22 along the left-right direction X. Each of the second clamping plates 32 is formed with a first through hole 322 facing the first adjustment hole 222, and two second through holes 323 facing the second adjustment holes 223 of the corresponding side plate 22. The first through hole 322 and the second through hole 323 of each of the second clamping plates 32 surround the corresponding shaft seat 34. Each of the shaft seats 34 extends into the corresponding central opening 221 and the corresponding first opening 311 and is located above the corresponding extension plate 33.

[0044] Each of the first screws 35 passes through the first through hole 322, the first adjustment hole 222 and the first through hole 312. Each of the second screws 36 passes through the second through hole 323, the second adjustment hole 223 and the second through hole 313.

[0045] See also Figure 4 ,and Figure 6 The side washer set 37 is respectively sleeved with the first screw 35 and the second screw 36 and is located between the side plate 22 and the first clamping plate 31. Each of the side washer sets 37 has a flat washer 371 abutting against the side plate 22, and a wave washer 372 abutting between the flat washer 371 and the first clamping plate 31. The locking nuts 38 are respectively screwed on the first screw 35 and the second screw 36. Each of the locking nuts 38 abuts against the first clamping plate 31 corresponding to the respective ones.

[0046] See also Figure 2 , Figure 4 ,and Figure 5, the adjustment unit 4 is arranged on the base 21. Each of the adjustment units 4 includes an adjustment screw 41 that can be screwed to the screw hole 331 of the corresponding extension plate 33 and can be movably connected along the up-down direction Z, a locking nut 42 that is screwed to the adjustment screw 41 and is located between the base 21 and the extension plate 33, and a flat washer 43 that is sleeved on the adjustment screw 41 and is located between the locking nut 42 and the base 21. Since the wave washer 372 of each side washer group 37 is in point contact with the flat washer 371 and the first clamping plate 31, the force of the flat washer 371 to tighten the second clamping plate 32 and the side plate 22 with the first screw 35 or the second screw 36 is relatively small. Therefore, by rotating one of the adjustment screws 41, the corresponding extension plate 33 can be driven to move up and down, and the corresponding fixing unit 3 can be moved up and down relative to the base 21.

[0047] See also Figure 3 ,and Figure 5 The conveying unit 5 is disposed between the fixing units 3 and includes two bearings 51 respectively disposed in the installation space 341, a roller 52 extending along the left-right direction X and the central axis L, and two rotating shafts 53 respectively disposed in the bearings 51 and connected to both ends of the roller 52. Through the bearings 51, the roller 52 and the rotating shaft 53 can rotate together with the central axis L as the center.

[0048] See also Figures 4 to 6 , when each of the first screws 35 and each of the second screws 36 are not completely tightened, the first clamping plate 31 and the second clamping plate 32 of each of the fixing units 3 can drive the first screw 35 and the second screw 36 corresponding to each other to move up and down along the first adjustment hole 222 and the second adjustment hole 223 corresponding to each other. In other words, each of the fixing units 3 can loosely clamp the corresponding side plate 22 along the left-right direction X, and can move relative to the corresponding side plate 22 along the up-down direction Z when each of the fixing units 3 does not clamp the corresponding side plate 22.

[0049] See also Figure 7 By loosening the tightening member 116 , the inner tube 115 of the first support rod 112 can be moved relative to the outer tube 114 , thereby changing the length of the first support rod 112 to quickly and roughly adjust the height of the roller 52 .

[0050] See also Figure 2 , Figure 4 and Fig. 9When each of the locking screws 234 is locked, the corresponding guide plate 232 cannot rotate. When each of the locking screws 234 is loosened, the corresponding guide plate 232 can rotate relative to the roller 52 and switch between a blocking position and a non-blocking position.

[0051] See also Figure 1 , Figure 2 When each of the guide plates 232 is located at the stopping position, it protrudes upward relative to the roller 52 along the up-down direction Z and abuts against the corresponding stopper 224 along the left-right direction X. Each of the stoppers 224 can block the corresponding guide plate 232 and prevent it from continuing to rotate outward, so that the guide plate 232 can be abutted more stably.

[0052] See also Figure 1 , Fig. 9 When each of the guide plates 232 is located at the non-blocking position, it does not protrude upward relative to the roller 52 along the up-down direction Z.

[0053] See also Figures 4 to 6 To simplify the description, the following describes the steps of fine-tuning the height and level of the roller 52 using the fixing unit 3 and the adjusting unit 4 on one side.

[0054] Rotating the adjustment screw 41 can drive the fixing unit 3 to move up and down relative to the base 21, and the fixing unit 3 drives one side of the roller 52 to move up and down, so as to complete the height adjustment of one side of the roller 52. Following the same steps to operate the adjustment units 4 on both sides, and placing a level meter on the base plate 211, the height of the roller 52 and the level of both sides can be further fine-tuned easily and quickly.

[0055] It should be noted that in other variations of this embodiment, the number of the rollers 52 is not limited, and the user can expand the number of the rollers 52 along the front-to-back direction Y according to the same structure to increase the length of the conveying surface of the roller support device.

[0056] See also Figure 1 ,and Figure 8When using the roller support device, the first support leg 11 and the second support leg 12 are first unfolded, the upper end of the second support leg 12 is against the outer tube 114 of the first support rod 112, the lower ends of the first cross bar 111 and the second support leg 12 are respectively supported on the ground, and then the roller support device is placed at the feeding position of a wood planer 6. The wood planer 6 includes a platform 61 and a baffle 62 extending upward from one side of the platform 61. Then a piece of wood 7 is placed above the roller 52 and the platform 61. At this time, the user can adjust the height of the roller 52 according to the above method, so that the top surface of the roller 52 is parallel to the top surface of the platform 61, and then the wood 7 can be pressed against the baffle 62, and the wood 7 can be easily and conveniently pushed for planing.

[0057] See also Figure 5 ,and Figure 8 During the planing process, the adjusting screws 41 can respectively position the extension plates 33 to prevent the first clamping plate 31 or the second clamping plate 32 from being offset due to vibrations generated during the planing process, thereby preventing the roller 52 from shifting downward and effectively maintaining the horizontal stability of the roller 52. When the wood 7 moves on the roller 52, the guide plate 232 can be pressed against by the wood 7 to prevent the wood 7 from slipping off the left or right side of the roller 52.

[0058] See also Fig. 9 When the guide plate 232 is not needed, the guide plate 232 can be rotated to be transferred to the non-blocking position for folding.

[0059] See also Fig.10 , which is the second embodiment of the roller support device of the utility model.

[0060] See also Figure 5 ,and Fig.10The difference between the second embodiment and the first embodiment is that each of the fixing units 3 does not have the extension plate 33 connected to the first clamping plate 31, and each of the shaft seats 34 is located above the corresponding adjustment screws 41, and each of the adjustment screws 41 abuts against the corresponding shaft seats 34. Each of the locking nuts 42 is replaced by a fixing nut 44 welded to the base 21 and located between the base 21 and the shaft seats 34. By loosening the first screw 35 and the second screw 36 and then rotating the adjustment screw 41, the adjustment screw 41 can move up and down relative to the base 21 to adjust the height of the shaft seat 34, thereby changing the height of the roller 52. Finally, the first screw 35 and the second screw 36 are tightened to complete the adjustment of the height of the roller 52. Therefore, the second embodiment can also achieve the same purpose and effect as the first embodiment.

[0061] In summary, the roller support device of the utility model can move up and down relative to the corresponding side plate 22 through each of the fixing units 3, and each of the adjustment screws 41 is screwed on the corresponding extension plate 33 of the fixing unit 3. The user can quickly and conveniently adjust the height and level of the roller 52, so the purpose of the utility model can be achieved.

[0062] The above is only an embodiment of the present invention and should not be used to limit the scope of the present invention. All simple equivalent changes and modifications made according to the claims and description of the present invention are still within the scope of the present invention.

Claims

1. A roller support device, comprising a base, a wheel frame, two fixing units, and a conveying unit; characterized in that: The wheel frame includes a base arranged on the base, and two side plates extending upward from the base and spaced apart in the left-right direction. The fixing units are respectively arranged on the side plates and can move relative to the side plates in the up-down direction. The conveying unit is arranged between the fixing units and includes a roller extending in the left-right direction. The roller can rotate around a central axis extending in the left-right direction.

2. The roller support device according to claim 1, characterized in that: Each of the side plates defines a central opening around the central axis, and a first adjustment hole extending in the up-down direction is formed on each of the side plates, and each of the fixing units can loosely clamp the corresponding side plates along the left-right direction, and each of the fixing units includes a first clamping plate defining a first opening around the central axis, a second clamping plate defining a second opening around the central axis and cooperating with the first clamping plate to clamp the corresponding side plates along the left-right direction, an axle seat defining an installation space around the second opening and connected to the second clamping plate, and a first screw, a first through hole facing the corresponding first adjustment hole is formed on each of the first clamping plates, and a first through hole facing the corresponding first adjustment hole is formed on each of the second clamping plates, and each of the first screws passes through the corresponding first through hole and the corresponding first adjustment hole and can loosely screw lock in the corresponding first through hole, and the conveying unit also includes two bearings respectively arranged in the installation space, and two rotating shafts respectively arranged on the bearings and respectively connected to the two ends of the roller, and when each of the first screws is not completely locked, the first clamping plate and the second clamping plate of each of the fixing units can drive the corresponding first screw to move up and down along the corresponding first adjustment hole.

3. The roller support device according to claim 2, characterized in that: Each of the first clamping plates is located between the corresponding side plate and the roller, and each of the shaft seats extends into the corresponding central opening and the corresponding first opening.

4. The roller support device according to claim 2, characterized in that: Each of the central openings extends downward from the top surface of the corresponding side panel, and each of the first adjustment holes extends downward from the bottom of the corresponding central opening, and each of the side panels is also formed with two second adjustment holes extending along the up-down direction and located on the two opposite sides of the corresponding central opening along the front-to-back direction. Each of the first clamping plates is also formed with two second through holes respectively facing the second adjustment holes of the corresponding side panels, and each of the second clamping plates is also formed with two second through holes respectively facing the second adjustment holes of the corresponding side panels. Each of the fixing units also includes two second screws, and each of the second screws passes through the corresponding second through hole and the corresponding second adjustment hole and can be loosely screwed in the corresponding second through hole. When each of the first screws and each of the second screws are not completely tightened, the first clamping plate and the second clamping plate of each of the fixing units can drive the corresponding first screw and the second screw to move up and down along the corresponding first adjustment hole and the second adjustment hole respectively.

5. The roller support device according to claim 2, characterized in that: Each of the fixing units further includes a side washer set on which the first screw is sleeved and located between the side plate and the first clamping plate. Each of the side washer sets has a flat washer abutting against the side plate and a wave washer abutting between the flat washer and the first clamping plate.

6. The roller support device according to claim 2, characterized in that: The base also has two through holes respectively adjacent to the side plates, each of the fixing units also includes an extension plate connected to the first clamping plate, each of the extension plates has a screw hole penetrating along the up and down directions, and the roller support device also includes two adjustment units, each of the adjustment units includes an adjustment screw extending into the corresponding through hole, and a locking nut screwed into the adjustment screw and located between the base and the extension plate, and each of the adjustment screws is screwed into the corresponding screw hole of the extension plate.

7. The roller support device according to claim 1, characterized in that: The base includes a first leg and a second leg, the first leg having a first cross bar, a first support rod extending upward from the middle of the first cross bar, and a pivot member arranged on the first support rod, the second leg is pivotally connected to the pivot member, the first support rod has an outer tube pivotally connected to the second leg, an inner tube movably inserted into the outer tube, and a tightening member that can loosely clamp the outer tube and the inner tube.

8. The roller support device according to claim 1, characterized in that: The base also has two through holes respectively adjacent to the side plates, each of the side plates defines a central opening around the central axis, and each of the side plates is formed with a first adjustment hole extending in the up-down direction, and each of the fixing units can loosely clamp the corresponding side plates along the left-right direction, and each of the fixing units includes a first clamping plate around the central axis, a second clamping plate around the central axis and cooperating with the first clamping plate to clamp the corresponding side plates along the left-right direction, an axle seat defining an installation space around the central axis and connecting the second clamping plate, and a first screw, and each of the first clamping plates is formed with a first through hole facing the corresponding first adjustment hole. Each of the second clamping plates forms a first through hole facing the respectively corresponding first adjustment hole, and each of the first screws passes through the respectively corresponding first through hole and the respectively corresponding first adjustment hole and can be loosely screwed in the respectively corresponding first through hole, and the conveying unit also includes two bearings respectively arranged in the installation space, and two rotating shafts respectively arranged on the bearings and respectively connected to the two ends of the roller, and the roller support device also includes two adjustment units, each of the adjustment units includes an adjustment screw extending into the respectively corresponding through hole and abutting against the respectively corresponding axle seat, and a fixing nut screwed on the adjustment screw, connected to the base and located between the base and the axle seat.

9. The roller support device according to claim 1, characterized in that: The wheel frame also includes two guide members respectively arranged on the side plates, each of the guide members has a mounting plate arranged on the corresponding side plate, and a guide plate rotatably arranged on the mounting plate, each of the guide plates extends along the up-down direction, each of the guide plates can rotate relative to the roller and transform between a blocking position and a non-blocking position, when each of the guide plates is located at the blocking position, it protrudes upward relative to the roller along the up-down direction, and when each of the guide plates is located at the non-blocking position, it does not protrude upward relative to the roller along the up-down direction.

10. The roller support device according to claim 9, characterized in that: Each of the side plates has a stopper extending forward along the front-rear direction. When each of the guide plates is located at the stopper position, it abuts against the corresponding stopper along the left-right direction.

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