Movable trolley and method for measuring the center height of a cylindrical rod-shaped material

Abstract

The application discloses a mobile trolley and a method for measuring the center height of a cylindrical rod-shaped material by using the mobile trolley, wherein the mobile trolley comprises a trolley body, a moving mechanism below the trolley body, and a bearing mechanism on the top of the trolley body; the bearing mechanism comprises a V-shaped groove which is upwardly open to load the cylindrical rod-shaped material; a through hole is formed in the groove bottom of the V-shaped groove; the V-shaped groove comprises first and second groove walls which are symmetrically arranged relative to the plumb line; a laser ranging unit is arranged below the V-shaped groove; the laser ranging unit and the through hole are oppositely arranged in the vertical direction; a control unit is arranged on the trolley body and electrically connected with the laser ranging unit to control the laser ranging unit to emit laser; the laser can penetrate through the through hole in the vertical direction to obtain the interval distance between the laser ranging unit and the cylindrical rod-shaped material. The application solves the problem that the center height of the cylindrical rod-shaped material relative to the ground needs to be manually measured by using a detection device before the cylindrical rod-shaped material is put into the equipment, and the operation cost is high and the efficiency is low.

Description

Technical Field

[0001] This invention relates to the field of logistics equipment, and more particularly to a mobile trolley and a method for measuring the center height of a cylindrical bar using the mobile trolley. Background Technology

[0002] In the production and processing of large-scale machinery, the input of large cylindrical rods is often involved. The usual practice is to load these large cylindrical rods from the warehouse onto a mobile logistics cart, then move them from the warehouse to a designated workstation, and finally input them into the equipment's feed inlet. Currently, the specific process for inputting cylindrical rods into the equipment's feed inlet is as follows: First, the mobile cart, along with the cylindrical rod, is placed in an external testing device. The device performs testing, obtaining and recording the height of the cylindrical rod's center relative to the ground. Then, the cart is moved to the feeding area of ​​the equipment. Next, based on the recorded height, the height of the carrying mechanism on the mobile cart or the height of the air shaft that picks up the material on the feeding device is adjusted so that the air shaft can be inserted into and support the cylindrical rod's core. Finally, the cylindrical rod is input into the equipment's feed inlet. The entire feeding process requires the height of the cylindrical bar material's center relative to the ground to be obtained through a detection device. Therefore, the mobile trolley needs to stop inside the detection device for testing, which increases operating costs and reduces the logistics efficiency of the mobile trolley.

[0003] In summary, existing mobile trolleys loaded with cylindrical rods require manual measurement of the center height using external detection equipment before feeding the rods into the feed inlets of various workstations. Only then can the height of the mobile trolley's carrying mechanism or the height of the air shaft for picking up the material on the feeding equipment be adjusted based on the measured height. This process results in high operating costs and low efficiency. Summary of the Invention

[0004] To address the problems in the prior art, this invention provides a mobile trolley for loading cylindrical bar materials and a method for measuring the center height of the cylindrical bar material using the mobile trolley. This solves the problem of high operating costs and low efficiency in the prior art, where manual measurement of the center height of the cylindrical bar material relative to the ground is required before it is loaded into the equipment.

[0005] To achieve the above-mentioned objective, one embodiment of the present invention provides a mobile trolley for loading cylindrical rods, comprising: a trolley body, a moving mechanism disposed below the trolley body, and a bearing mechanism disposed on the top of the trolley body. The bearing mechanism includes a V-shaped groove with an upward opening for loading the cylindrical rods. A through hole is formed at the bottom of the V-shaped groove. The V-shaped groove includes first and second groove walls symmetrically arranged relative to the vertical line. A laser ranging unit is disposed below the V-shaped groove. The laser ranging unit and the through hole are arranged vertically opposite each other. A control unit electrically connected to the laser ranging unit is disposed on the trolley body to control the laser ranging unit to emit a laser. The laser can penetrate the through hole vertically and strike the cylindrical rod to obtain the interval distance between the laser ranging unit and the cylindrical rod.

[0006] As a further improvement of one embodiment of the present invention, the vehicle body includes a chassis and a cover, the cover is mounted on the chassis, and the lower end of the side wall of the cover is fixedly connected to the chassis.

[0007] As a further improvement of one embodiment of the present invention, the moving mechanism includes multiple sets of pivotable rollers and a power source for driving the multiple sets of rollers to rotate. The multiple sets of rollers are pivotally connected to the chassis, and the power source is fixedly connected to the chassis.

[0008] As a further improvement of one embodiment of the present invention, the vehicle body further includes a lifting device, the fixed end of which is fixedly connected to the chassis, and the telescopic end of which is fixedly connected to the load-bearing mechanism.

[0009] As a further improvement of one embodiment of the present invention, the telescopic end of the lifting device is configured as a telescopic rod, and the fixed end of the lifting device includes a sleeve sleeved on the telescopic rod. The lower end of the sleeve is fixedly connected to the chassis. A flange is provided on the outer side wall of the sleeve near the upper end face, and a power device for driving the telescopic rod to extend and retract is fixedly connected to the flange.

[0010] As a further improvement of one embodiment of the present invention, the fixed end of the lifting device further includes multiple columns arranged around the sleeve, the lower end of the columns is fixedly connected to the chassis, a connecting crossbar is fixedly connected between two adjacent columns, multiple sets of support plates are fixedly connected between the flange and the chassis, and the two side walls of the multiple sets of support plates are fixedly connected to the connecting crossbar.

[0011] As a further improvement of one embodiment of the present invention, the supporting mechanism further includes a downward-facing support cover, which is sleeved on multiple columns. Multiple support blocks are provided on the upper surface of the support cover. The V-shaped groove is fixedly connected to the support cover through the multiple support blocks. A hollow portion is provided on the top wall of the support cover below the through hole.

[0012] As a further improvement of one embodiment of the present invention, the side of the column facing the support cover is provided with a slide rail, and the inner sidewall of the support cover is provided with a slide groove that matches the slide rail.

[0013] As a further improvement of one embodiment of the present invention, a mounting bracket is fixedly connected to the inner top wall of the support cover, and the laser ranging unit is fixedly connected to the mounting bracket.

[0014] The present invention also provides a method for measuring the center height of a cylindrical rod using the aforementioned moving trolley, characterized in that it includes:

[0015] Step S1: Obtain the degree measure of the included angle ∠BOC between the two walls of the V-shaped groove;

[0016] Step S2: Obtain the predetermined distance OF from the laser ranging unit to the through hole;

[0017] Step S3: Place the cylindrical rod to be measured in the V-groove and turn on the laser ranging unit to obtain the distance EF between the laser ranging unit and the cylindrical rod to be measured;

[0018] Step S4: Calculate the distance AF from the center point of the round bar to be measured to the laser ranging unit, where,

[0019] As a further improvement to one embodiment of the present invention, step S2, which involves obtaining the predetermined distance OF from the laser ranging unit to the through hole, specifically includes:

[0020] Step S21: Place the test round bar with a known radius R0 into the V-groove;

[0021] Step S22: Turn on the laser ranging unit to obtain the distance EF' between the laser ranging unit and the test round bar.

[0022] Step S23: Calculate the distance of OF, where,

[0023]

[0024] As a further improvement to one embodiment of the present invention, it further includes:

[0025] Obtain the height of the laser ranging unit relative to the ground;

[0026] The height of the center point of the cylindrical rod to be measured from the ground is obtained based on the height of the laser ranging unit relative to the ground and the distance AF from the center point of the cylindrical rod to be measured to the laser ranging unit.

[0027] Compared with the prior art, the present invention has the following beneficial effects:

[0028] This invention provides a mobile trolley and a method for measuring the center height of a cylindrical bar using the mobile trolley. By setting up the mobile trolley, the height of the center of the cylindrical bar to be measured from the ground can be quickly obtained, so as to adjust the center height of the cylindrical bar itself or the height of the air shaft at the end of the equipment. This allows the cylindrical bar to be quickly put into the equipment, reducing the problems of high operating costs and low efficiency when manually using detection equipment to measure the center height of the cylindrical bar from the ground. Attached Figure Description

[0029] Figure 1 This is a schematic diagram of the structure of the mobile cart according to one embodiment of the present invention;

[0030] Figure 2 yes Figure 1 Cross-sectional view along direction A;

[0031] Figure 3 yes Figure 1 Front view of the China Mobile vehicle;

[0032] Figure 4 yes Figure 3 Cross-sectional view along direction B;

[0033] Figure 5 yes Figure 1 A top view of the mobile trolley;

[0034] Figure 6 yes Figure 5 Cross-sectional view along direction C;

[0035] Figure 7 This is a cross-sectional view of the cylindrical rod-shaped material to be tested placed into the V-shaped groove, at the through hole of the V-shaped groove.

[0036] Figure 8 This is a cross-sectional view of a test round bar with a known radius of R0 placed into the V-groove at the through hole of the V-groove.

[0037] The above figures include the following reference numerals:

[0038] 11. V-groove; 111. Through hole; 12. Support cover; 121. Slide groove; 13. Support block;

[0039] 21. Laser ranging unit; 22. Mounting bracket;

[0040] 31. Chassis;

[0041] 32. Cover;

[0042] 33. Lifting device; 331. Telescopic rod; 332. Sleeve; 3321. Flange; 333. Power unit; 334. Column; 3341. Slide rail; 335. Crossbar; 336. Support plate;

[0043] 41. Roller. Detailed Implementation

[0044] The preferred embodiments of the present invention will now be described in detail with reference to the accompanying drawings, so that the advantages and features of the present invention can be more easily understood by those skilled in the art, thereby providing a clearer and more explicit definition of the scope of protection of the present invention.

[0045] The terms "comprising" and "having," and any variations thereof, used in this invention are intended to cover non-exclusive inclusion. References to "embodiment" herein mean that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0046] To address the problem of high operating costs and low efficiency in existing technologies where cylindrical rods need to have their center height measured by a detection device before being loaded into equipment, this invention provides a mobile trolley for loading cylindrical rods.

[0047] This embodiment provides a mobile trolley for loading cylindrical rods, including a trolley body, a moving mechanism disposed below the trolley body, and a carrying mechanism disposed on the top of the trolley body. The carrying mechanism includes a V-shaped groove 11 with an upward opening for loading the cylindrical rods. A through hole 111 is formed at the bottom of the V-shaped groove. The V-shaped groove includes first and second groove walls symmetrically arranged with respect to the vertical line. A laser ranging unit 21 is disposed below the V-shaped groove. The laser ranging unit and the through hole are arranged opposite each other in the vertical direction. A control unit electrically connected to the laser ranging unit 21 is disposed on the trolley body to control the laser ranging unit to emit a laser. The laser can penetrate the through hole in the vertical direction and hit the cylindrical rod to obtain the interval distance between the laser ranging unit and the cylindrical rod.

[0048] The mobile trolley, configured as described above, places the cylindrical bar to be measured into the V-groove 11. The control unit then activates the laser ranging unit 21. The laser emitted by the laser ranging unit 21 penetrates the through-hole 111 vertically and strikes the cylindrical bar. Therefore, the distance between the laser ranging unit 21 and the cylindrical bar can be obtained. Typically, the included angle between the two walls of the V-groove 11 is set according to a predetermined value. The distance from the laser ranging unit 21 to the through-hole 111 at the bottom of the groove can also be obtained through measurement. Based on these measurements, the height of the center of the cylindrical bar relative to the laser ranging unit 21 can be calculated.

[0049] Furthermore, since the laser ranging unit 21 is located below the V-groove 11, its height relative to the ground can be obtained, thereby obtaining the height of the center of the cylindrical rod relative to the ground. Based on the height of the center of the cylindrical rod relative to the ground, the center height of the cylindrical rod itself or the height of the air shaft forklifting the material on the feeding device is adjusted, so that the air shaft can be inserted into the core of the cylindrical rod, and the cylindrical rod is supported by the air shaft by inflation and fed into the feeding port of the device.

[0050] like Figure 1 As shown, the vehicle body includes a chassis 31 and a cover 32. The cover 32 surrounds the load-bearing mechanism and covers the chassis 31. The lower end of the side wall of the cover 32 is fixedly connected to the chassis 31.

[0051] Furthermore, the moving mechanism includes multiple sets of pivotable rollers 41 and a power source that drives the multiple sets of rollers 41 to rotate. The multiple sets of rollers 41 are pivotally connected to the chassis 31, and the power source is fixedly connected to the chassis 31. This arrangement allows the trolley to be driven by the power source, reducing the need for manual pulling and improving work efficiency. Of course, to make the trolley more stable when moving, some omnidirectional wheels that do not require a power source can also be used.

[0052] like Figure 2-4 As shown, to avoid wear caused by frequent lifting and lowering of the air shaft on the equipment, the vertical height of the air shaft on the equipment can be set to be fixed, while the carrying mechanism of the mobile trolley can be set to be height-adjustable, so as to adjust the center height of the cylindrical bar itself, thereby cooperating with the air shaft to allow the air shaft to be accurately inserted into the core of the cylindrical bar. Specifically, the mobile trolley body is also equipped with a lifting device 33. The fixed end of the lifting device 33 is fixedly connected to the chassis 31, and the telescopic end of the lifting device 33 is fixedly connected to the carrying mechanism.

[0053] Furthermore, the telescopic end of the lifting device 33 is configured as a telescopic rod 331, and the fixed end of the lifting device 33 includes a sleeve 332 sleeved on the telescopic rod 331. The lower end of the sleeve 332 is fixedly connected to the chassis 31, and the telescopic rod 331 can move up and down inside the sleeve 332.

[0054] Normally, the position where the lower end of the telescopic rod 331 abuts against the inner bottom wall of the sleeve 332 is defined as the original position of the telescopic rod 331. In the original position, the height of the laser ranging unit 21 relative to the ground is a preset height. Therefore, when the telescopic rod 331 is in the original position, the height from the center of the cylindrical bar to be measured placed in the V-groove 11 to the ground is actually the sum of the height from the center of the cylindrical bar to the laser ranging unit 21 and the preset height mentioned above.

[0055] When the telescopic rod 331 is in the process of extension and retraction, the lifting device 33 can record the travel height of the telescopic rod 331 relative to the origin. At this time, the height of the laser ranging unit 21 from the ground is equal to the sum of the preset height and the travel height of the telescopic rod 331 relative to the origin. To obtain the actual height of the center of the cylindrical bar to be measured within the V-groove 11 from the ground during the lifting and retraction process, it can be obtained by calculating the sum of the height of the center of the cylindrical bar to be measured from the laser ranging unit 21 and the height of the laser ranging unit 21 from the ground during the lifting and retraction process.

[0056] Furthermore, a flange 3321 is provided on the outer side wall of the sleeve 332 near the upper end face, and a power device 333 for driving the telescopic rod 331 to extend and retract is fixedly connected to the flange. This power device 333 can be configured as a drive motor.

[0057] like Figure 4 As shown, the fixed end of the lifting device 33 also includes multiple columns 334 arranged around the sleeve. The lower end of the columns 334 is fixedly connected to the chassis 31. A connecting crossbar 335 is fixedly connected between two adjacent columns 334. Multiple sets of support plates 336 are fixedly connected between the flange 3321 and the chassis 31. The two side walls of the multiple sets of support plates 336 are fixedly connected to the connecting crossbar 335. This design makes the fixed end of the lifting device 33 more secure and reduces the shaking of the telescopic rod 331 during the extension and retraction process.

[0058] like Figure 5The supporting mechanism further includes a downward-facing support cover 12, which is sleeved on multiple columns 334. Multiple support blocks 13 are provided on the upper surface of the support cover 12. The V-shaped groove 11 is fixedly connected to the support cover 12 through the multiple support blocks 12. A hollow part is provided on the top wall of the support cover 12 below the through hole 111. The function of the hollow part is mainly to avoid blocking the laser ranging unit 21 from emitting laser to the through hole 111.

[0059] like Figure 6 The column 334 is provided with a slide rail 3341 on the side facing the support cover 12, and the inner side wall of the support cover 12 is provided with a slide groove 121 that matches the slide rail. This arrangement makes the support cover 12 more stable during the lifting and lowering process.

[0060] Furthermore, the telescopic rod 331 is fixedly connected to the inner top wall of the support cover 12.

[0061] In addition, a mounting bracket 22 is fixedly connected to the inner top wall of the support cover 12, and the laser ranging unit 21 is fixedly connected to the mounting bracket 22 so that when the support cover moves up and down with the telescopic rod 331, the laser ranging unit 21 and the support groove 11 remain relatively stationary.

[0062] This invention also provides a method for measuring the center height of a cylindrical rod using the aforementioned moving trolley, combined with... Figure 7 As shown, it includes:

[0063] Step S1: Obtain the degree measure of the included angle ∠BOC between the two walls of the V-groove 11;

[0064] Step S2: Obtain the predetermined distance OF from the laser ranging unit 21 to the through hole 111;

[0065] Step S3: Place the cylindrical rod to be measured in the V-groove 11 and turn on the laser ranging unit 21 to obtain the distance EF between the laser ranging unit 21 and the cylindrical rod to be measured.

[0066] Step S4: Calculate the distance AF from the center point of the round bar to be measured to the laser ranging unit 21, where,

[0067]

[0068] Since measuring the predetermined distance OF from the laser ranging unit 21 to the through hole 111 using measuring tools is usually difficult, the distance OF is usually obtained by calculation, combined with... Figure 8 As shown, the specific steps to obtain the distance OF are as follows:

[0069] Step S21: Place the test round bar with a known radius R0 into the V-groove 11;

[0070] Step S22: Turn on the laser ranging unit 21 to obtain the distance EF' between the laser ranging unit 21 and the test round bar.

[0071] Step S23: Calculate the distance of OF, where,

[0072]

[0073] Furthermore, the method for measuring the center height of a cylindrical bar also includes:

[0074] Obtain the height of the laser ranging unit 21 relative to the ground;

[0075] The height of the center point of the cylindrical rod to be measured from the ground is obtained based on the height of the laser ranging unit 21 relative to the ground and the distance AF from the center point of the cylindrical rod to be measured to the laser ranging unit 21.

[0076] Specifically, the height of the center point of the cylindrical rod to be measured from the ground is the sum of the height of the laser ranging unit 21 relative to the ground and the distance AF from the center point of the cylindrical rod to be measured to the laser ranging unit 21. The method for obtaining the height of the laser ranging unit 21 relative to the ground is as described above and will not be repeated here. Based on the height of the center point of the cylindrical rod to be measured from the ground, the height of the V-groove 11 or the height of the air shaft used to remove the cylindrical rod at the device end is adjusted, so that the air shaft can be inserted into the core of the cylindrical rod and fed into the inlet of the device.

[0077] In summary, the mobile trolley and the method for measuring the center height of a cylindrical bar provided by the present invention have the following technical advantages compared to the prior art:

[0078] 1. By setting up this mobile trolley, the height of the center of the cylindrical bar to be measured from the ground can be quickly obtained, so as to adjust the center height of the cylindrical bar itself or the height of the air shaft at the end of the equipment. This allows the cylindrical bar to be quickly put into the equipment, reducing the problem of high operating costs and low efficiency caused by manually using testing equipment to measure the height of the center of the cylindrical bar from the ground.

[0079] 2. By installing a lifting device on the mobile trolley, the lifting device at the equipment end can be eliminated. The lifting of the mobile trolley carrying device can meet different equipment needs, reducing the processing cost of the lifting part at the equipment end and reducing the failure of the air shaft of the equipment due to lifting.

[0080] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit it. Although the present invention has been described in detail through the above preferred embodiments, those skilled in the art should understand that various changes can be made to it in form and detail without departing from the scope defined by the claims of the present invention.

Claims

1. A method for measuring the center height of a cylindrical rod-shaped material using a moving trolley, characterized in that, The mobile trolley includes a vehicle body, a moving mechanism disposed below the vehicle body, and a carrying mechanism disposed on the top of the vehicle body. The carrying mechanism includes a V-shaped groove (11) with an upward opening for loading cylindrical bars. A through hole (111) is formed at the bottom of the V-shaped groove. The V-shaped groove includes first and second groove walls symmetrically arranged relative to the vertical line. A laser ranging unit (21) is disposed below the V-shaped groove. The laser ranging unit and the through hole are arranged opposite each other in the vertical direction. A control unit electrically connected to the laser ranging unit is disposed on the vehicle body to control the laser ranging unit (21) to emit laser. The laser can penetrate the through hole in the vertical direction and hit the cylindrical bar to obtain the distance between the laser ranging unit (21) and the cylindrical bar. The methods include: Step S1: Obtain the degree measure of the included angle ∠BOC between the two walls of the V-groove (11); Step S2: Obtain the predetermined distance OF from the laser ranging unit (21) to the through hole (111); Step S3: Place the cylindrical rod to be measured in the V-groove (11) and turn on the laser ranging unit (21) to obtain the distance EF between the laser ranging unit (21) and the cylindrical rod to be measured; Step S4: Calculate the distance AF from the center point of the round bar to be measured to the laser ranging unit (21), where, 。 2. The method for measuring the center height of a cylindrical rod according to claim 1, characterized in that, Step S2, obtaining the predetermined distance OF from the laser ranging unit (21) to the through hole (111), specifically includes: Step S21: Place the test round bar with a known radius of R0 into the V-groove (11); Step S22: Turn on the laser ranging unit (21) to obtain the distance EF' between the laser ranging unit (21) and the test round bar. Step S23: Calculate the distance of OF, where, 。 3. The method for measuring the center height of a cylindrical rod according to claim 1, characterized in that, Also includes: Obtain the height of the laser ranging unit (21) relative to the ground; The height of the center point of the cylindrical rod to be measured from the ground is obtained based on the height of the laser ranging unit (21) relative to the ground and the distance AF from the center point of the cylindrical rod to be measured to the laser ranging unit (21).

4. The method for measuring the center height of a cylindrical rod-shaped material using a moving trolley according to claim 1, characterized in that, The vehicle body includes a chassis (31) and a cover (32). The cover (32) surrounds the support mechanism and covers the chassis (31). The lower end of the side wall of the cover (32) is fixedly connected to the chassis (31).

5. The method for measuring the center height of a cylindrical rod-shaped material using a moving trolley according to claim 4, characterized in that, The moving mechanism includes multiple sets of pivotable rollers (41) and a power source that drives the multiple sets of rollers (41) to operate. The multiple sets of rollers (41) are pivotally connected to the chassis (31), and the power source is fixedly connected to the chassis (31).

6. The method for measuring the center height of a cylindrical rod-shaped material using a moving trolley according to claim 4, characterized in that, The vehicle body also includes a lifting device (33), the fixed end of which is fixedly connected to the chassis (31), and the telescopic end of which is fixedly connected to the load-bearing mechanism.

7. The method for measuring the center height of a cylindrical rod-shaped material using a moving trolley according to claim 6, characterized in that, The telescopic end of the lifting device (33) is configured as a telescopic rod (331). The fixed end of the lifting device (33) includes a sleeve (332) sleeved on the telescopic rod (331). The lower end of the sleeve (332) is fixedly connected to the chassis (31). A flange (3321) is provided on the outer side wall of the sleeve (332) near the upper end face. A power device (333) for driving the telescopic rod to extend and retract is fixedly connected to the flange.

8. The method for measuring the center height of a cylindrical rod-shaped material using a moving trolley according to claim 7, characterized in that, The fixed end of the lifting device also includes multiple columns (334) arranged around the sleeve. The lower end of the column (334) is fixedly connected to the chassis (31). A connecting crossbar (335) is fixedly connected between two adjacent columns (334). Multiple sets of support plates (336) are fixedly connected between the flange (3321) and the chassis (31). The two side walls of the multiple sets of support plates (336) are fixedly connected to the connecting crossbar (335).

9. The method for measuring the center height of a cylindrical rod-shaped material using a moving trolley according to claim 8, characterized in that, The supporting mechanism also includes a downward-facing support cover (12), which is fitted onto multiple columns (334). Multiple support blocks (13) are provided on the upper surface of the support cover (12). The V-shaped groove (11) is fixedly connected to the support cover (12) through the multiple support blocks (12). A hollow part is provided on the top wall of the support cover (12) below the through hole (111).

10. The method for measuring the center height of a cylindrical rod-shaped material using a moving trolley according to claim 9, characterized in that, The column (334) is provided with a slide rail (3341) on the side facing the support cover (12), and the inner side wall of the support cover (12) is provided with a slide groove (121) that matches the slide rail.

11. The method for measuring the center height of a cylindrical rod-shaped material using a moving trolley according to claim 9, characterized in that, The telescopic rod (331) is fixedly connected to the inner top wall of the support cover (12).

12. The method for measuring the center height of a cylindrical rod-shaped material using a moving trolley according to claim 9, characterized in that, A mounting bracket (22) is fixedly connected to the inner top wall of the support cover (12), and the laser ranging unit (21) is fixedly connected to the mounting bracket (22).

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