Axle Distance Measuring Device and Axle Distance Measuring Method for Semi-Trailer

Abstract

The present invention provides a wheelbase measuring device and a wheelbase measuring method for a semi-trailer. The wheelbase measuring device includes a locking mechanism, a measuring mechanism, a lifting rod, a bottom support, and a level gauge. The locking mechanism is used to sleeved on the outer periphery of the bottom of the kingpin and can be locked with the kingpin; the measuring mechanism includes a measuring cylinder arranged at the bottom end of the locking mechanism and a distance measuring member corresponding to the measuring cylinder. The inside of the measuring cylinder is hollow, and the axis of the measuring cylinder and the axis of the locking mechanism are on the same straight line; the lifting rod is arranged at the bottom end of the measuring cylinder and can be lifted relative to the measuring cylinder and be received in the measuring cylinder or extend out of the measuring cylinder; the bottom support is arranged at the bottom of the lifting rod and is perpendicular to the lifting rod; the level gauge is installed on the bottom support and is used to measure the levelness of the bottom support; when the locking mechanism is locked with the kingpin and the bottom support is in a horizontal state, the distance measuring member is used to measure the distance between the axle of the semi-trailer and the distance measuring member with it as the reference point.

Description

Technical Field

[0001] The present invention relates to the technical field of special vehicle measurement, and particularly to a wheelbase measurement device and a wheelbase measurement method for a semi-trailer. Background Art

[0002] A semi-trailer is a special vehicle widely used in the container transportation industry. During the production, processing, and welding of semi-trailers, there are dimensional deviations. To ensure that the axle coincides with the center of the vehicle body and the axle is perpendicular to the vehicle body, and to prevent tire uneven wear and deviation, it is necessary to accurately measure the distance from the kingpin to the left and right axles (wheelbase) after manufacturing and after-sales maintenance. This data is used to judge the manufacturing level and quality of the semi-trailer and as a basis for adjusting the axle position in the next step.

[0003] Currently, the commonly used method is to hang a plumb line at the kingpin of the semi-trailer and then measure the distance from the plumb line to the axle. However, this measurement method is easily interfered by the outside world, and the measurement data is extremely unstable. Summary of the Invention

[0004] The purpose of the present invention is to provide a wheelbase measurement device and a wheelbase measurement method for a semi-trailer to solve the problem that the wheelbase measurement data of the semi-trailer in the prior art is unstable due to external interference.

[0005] To solve the above technical problems, the present invention provides a wheelbase measurement device for a semi-trailer. The semi-trailer includes a kingpin. The wheelbase measurement device includes: a locking mechanism for sleeving on the outer periphery of the bottom of the kingpin and capable of locking with the kingpin; a measurement mechanism including a measurement cylinder provided at the bottom end of the locking mechanism and a distance measurement member corresponding to the measurement cylinder. The interior of the measurement cylinder is hollow, and the axis of the measurement cylinder and the axis of the locking mechanism are on the same straight line; a lifting rod provided at the bottom end of the measurement cylinder and capable of lifting relative to the measurement cylinder and being received in the measurement cylinder or extending out of the measurement cylinder; the axis of the lifting rod and the axis of the measurement cylinder are on the same straight line; a bottom support provided at the bottom of the lifting rod and perpendicular to the lifting rod; a level gauge installed on the bottom support for measuring the levelness of the bottom support. When the locking mechanism is locked with the kingpin and the bottom support is in a horizontal state, the distance measurement member is used to measure the distance between the axle of the semi-trailer and the distance measurement member with it as a reference point.

[0006] In one embodiment, a measurement hole is provided on the side wall of the measurement cylinder; the distance measurement member is provided in the measurement cylinder, corresponding to the measurement hole, and can emit a measurement beam through the measurement hole to the axle of the semi-trailer, so as to measure the distance between the axle of the semi-trailer and the distance measurement member.

[0007] In one embodiment, two of the measurement holes are arranged at intervals along the axial direction of the measurement cylinder, and the two measurement holes are arranged at intervals along the circumferential direction of the measurement cylinder; the number of the distance measurement members is two, corresponding to the two measurement holes.

[0008] In one embodiment, a measurement hole is formed in the side wall of the measurement cylinder; the distance measurement member is arranged in the measurement cylinder and corresponds to the measurement hole, the caliber of the distance measurement member gradually increases from top to bottom, and the top of the distance measurement member constitutes the reference point.

[0009] In one embodiment, a measurement hanging ring is arranged on the outer periphery of the measurement cylinder, and the reference point is arranged on the measurement hanging ring.

[0010] In one embodiment, a plurality of measurement hanging rings are arranged along the axial direction of the measurement cylinder.

[0011] In one embodiment, the lifting rod includes: a screw rod, an external lifting thread is annularly arranged on the outer periphery, and the external lifting thread extends along the axis of the screw rod; an adjusting nut, sleeved on the bottom end of the measurement cylinder, and the adjusting nut is provided with an adjusting thread adapted to the external lifting thread, so that the screw rod can be lifted to be accommodated in the measurement cylinder or extended out of the measurement cylinder.

[0012] In one embodiment, a groove is formed in the outer periphery of the screw rod, and the groove extends along the axial direction of the screw rod; a fixing hole is formed at the bottom of the measurement cylinder; the lifting rod further includes a fixing member; the fixing member can be inserted into the fixing hole and the groove at the same time to fix the screw rod.

[0013] In one embodiment, the adjusting nut includes two nut units; the nut units are in a semi-cylindrical shape, the two nut units enclose to form a cylindrical shape and are sleeved on the outer periphery of the measurement cylinder, and the two nut units are detachably connected through a fastener.

[0014] In one embodiment, the bottom of the measurement cylinder is in a stepped shape, the bottom of the adjusting nut is in a stepped shape, and the adjusting nut is adapted to the bottom of the measurement cylinder; a sliding bearing is further arranged between the adjusting nut and the measurement cylinder, and the sliding bearing is sleeved on the stepped part of the measurement cylinder.

[0015] In one embodiment, the locking mechanism includes: a locking sleeve, which is cylindrical, hollow inside, and has a plurality of sector units arranged circumferentially at its top; the plurality of sector units can approach or move away from each other to allow the towing pin to enter the locking sleeve or lock the towing pin; an external thread is provided on the outer periphery of the locking sleeve, and the external thread is located below the sector units; a locking nut, which is sleeved on the outer periphery of the locking sleeve and is provided with an internal thread adapted to the external thread, and can be rotated up to the position of the sector units to make the plurality of sector units approach each other or rotated down to make the plurality of sector units move away from each other.

[0016] In one embodiment, both ends of the bottom support along its length direction have accommodation grooves for accommodating the lifting rod and the level gauge respectively. There is a slit between the two accommodation grooves, and the slit extends from the top to the bottom of the bottom support; a fastening hole extending along the width direction of the bottom support is provided on the bottom support, and the fastening hole communicates with the slit, and the side walls on both sides of the slit are locked by fasteners to lock the lifting rod and the level gauge in the corresponding accommodation grooves.

[0017] The present invention also provides a method for measuring the wheelbase of a semi-trailer, using the wheelbase measuring device as described above;

[0018] The locking mechanism is sleeved on the outer periphery of the towing pin of the semi-trailer, and the towing pin is locked;

[0019] Adjust the lifting rod to make the lifting rod extend downward, so that the bottom support is close to the ground;

[0020] Adjust the position of the bottom support, and through the measurement of the level gauge, make the bottom support horizontally placed on the ground;

[0021] Adjust the lifting rod to make the lifting rod continue to extend downward, so that the bottom support presses tightly against the ground;

[0022] Measure the distance from the measurement point to the axle of the semi-trailer.

[0023] It can be seen from the above technical solutions that the advantages and positive effects of the present invention are:

[0024] The wheelbase measuring device in the present invention includes a locking mechanism, a measuring mechanism, a lifting rod, a bottom support, and a level gauge. It is locked with the drawbar through the locking mechanism to make the bottom support in a horizontal position, and it is pressed against the ground through the bottom support, so that the wheelbase measuring device is stable between the ground and the drawbar, and the locking mechanism, the measuring cylinder, and the lifting rod extend in the vertical direction. The wheelbase is measured with the measuring cylinder as a reference, so that the wheelbase measuring device is not easily affected by the external environment during the wheelbase measurement process, and the measurement data is relatively accurate. Moreover, the wheelbase measuring device can be quickly locked with the drawbar through the locking mechanism, and the height of the wheelbase measuring device can be adjusted through the lifting rod to quickly adjust to make the measuring cylinder the zero position or reference plane of the measurement reference, and the wheelbase can be quickly measured, thereby improving the measurement efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 is a schematic structural diagram of one embodiment of the wheelbase measuring device of the present invention;

[0026] Figure 2 is an exploded structural diagram of one embodiment of the wheelbase measuring device of the present invention and the drawbar.

[0027] The descriptions of the reference numerals are as follows:

[0028] 1. Wheelbase measuring device;

[0029] 11. Locking mechanism; 111. Locking sleeve; 1111. Fitting part; 1112. Threaded part; 1113. Connecting part; 1114. Sector unit; 112. Locking nut; 12. Measuring cylinder; 121. Measuring hole; 122. Sliding bearing; 123. Fixed hole; 13. Lifting rod; 131. Screw rod; 1311. Groove; 132. Adjusting nut; 1321. Nut unit; 133. Fixed part; 14. Connecting stud; 141. First external thread; 142. Second external thread; 143. Demarcation plate; 15. Handle; 16. Bottom support; 161. Accommodating groove; 162. Slit; 163. Fastening hole; 164. Fastener; 17. Level gauge; 18. Measuring hanging ring; 19. Laser rangefinder;

[0030] 2. Drawbar. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0031] Typical embodiments embodying the features and advantages of the present invention will be described in detail in the following description. It should be understood that the present invention can have various changes in different embodiments, all of which do not depart from the scope of the present invention, and the descriptions and illustrations therein are essentially for illustrative purposes and not intended to limit the present invention.

[0032] In order to further illustrate the principle and structure of the present invention, the preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

[0033] The present invention provides a wheelbase measuring device 1 for a semi-trailer, which is used to measure the wheelbase of the semi-trailer, so as to be applicable to measuring the wheelbase difference of the semi-trailer to judge the manufacturing level and quality of the semi-trailer.

[0034] Among them, there is a wheelbase between the kingpin 2 of the semi-trailer and the axles on both the left and right sides respectively. The difference between the wheelbases on the left and right sides is the wheelbase difference. The smaller the wheelbase difference is, the better the quality of the produced semi-trailer is. And this data is used as the basis for adjusting the distance and perpendicularity between the axle and the body in the next step.

[0035] The wheelbase measuring device 1 in the present invention measures the wheelbase difference with this wheelbase measuring device 1 as the reference body, is not easily affected by the external environment, and makes the measured data accurate. Moreover, the wheelbase measuring device 1 can be quickly loaded and unloaded, quickly adjusted, and the wheelbase can be quickly measured, improving the measurement efficiency.

[0036] The following details the wheelbase measuring device 1:

[0037] The first embodiment of the wheelbase measuring device 1

[0038] Referring to Figure 1 and Figure 2 , the wheelbase measuring device 1 in this embodiment includes a locking mechanism 11, a measuring cylinder 12, a distance measuring member, a connecting stud 14, a handle 15, a measuring hanging ring 18, a lifting rod 13, a bottom support 16, and a level gauge 17.

[0039] The locking mechanism 11 is used to sleeved on the outer periphery of the bottom of the kingpin 2 and can be locked with the kingpin 2. Specifically, the locking mechanism 11 includes a locking sleeve 111 and a locking nut 112.

[0040] The locking sleeve 111 includes a fitting portion 1111, a threaded portion 1112, and a connecting portion 1113 arranged in sequence from the top to the bottom along its axis. The fitting portion 1111 is generally cylindrical and includes a plurality of sector units 1114 arranged along the circumferential direction of the locking sleeve 111. The plurality of sector units 1114 can approach or move away from each other to allow the kingpin 2 to enter the locking sleeve 111 or lock the kingpin 2. In this embodiment, the number of the sector units 1114 is four and they are symmetrically arranged. Among them, the bottoms of the four sector units 1114 are fixedly connected into a whole ring. When not locked by the locking nut 112, there is a gap between the four sector units 1114 and they move away from each other, so that the bottom of the kingpin 2 can enter the space enclosed by the four sector units 1114.

[0041] The threaded portion 1112 is cylindrical and is located below the fitting portion 1111, and an external thread is provided on the outer periphery of the threaded portion 1112.

[0042] The connecting portion 1113 is cylindrical and is located below the threaded portion 1112. The axes of the connecting portion 1113, the threaded portion 1112, and the mating portion 1111 are on the same straight line.

[0043] The connecting portion 1113 includes a straight cylinder unit and a frustum unit. The diameter of the top of the frustum unit is the same as the diameter of the threaded portion 1112, the diameter of the bottom of the frustum unit is the same as the diameter of the straight cylinder unit, and the diameter of the straight cylinder unit is smaller than the diameter of the threaded portion 1112.

[0044] In this embodiment, the locking sleeve 111 is integrally formed.

[0045] The measuring cylinder 12 is cylindrical, hollow inside, and is arranged at the bottom end of the locking sleeve 111. The axis of the measuring cylinder 12 and the axis of the locking sleeve 111 are on the same straight line.

[0046] Measurement holes 121 are formed in the peripheral wall of the measuring cylinder 12. In this embodiment, the number of the measurement holes 121 is two, and the two measurement holes 121 are arranged at intervals along the axial direction of the measuring cylinder 12. At the same time, the two measurement holes 121 are arranged at intervals along the circumferential direction of the measuring cylinder 12, and the connection line between the two measurement holes 121 passes through the axis of the measuring cylinder 12, that is, the two measurement holes 121 are on the same diameter.

[0047] A step is provided at the bottom of the measuring cylinder 12, so that the bottom of the measuring cylinder 12 is stepped.

[0048] Furthermore, a sliding bearing 122 is sleeved on the bottom of the outer periphery of the measuring cylinder 12. Specifically, the sliding bearing 122 is sleeved at the step.

[0049] A fixing hole 123 is formed in the bottom of the measuring cylinder 12. The fixing hole 123 is located below the sliding bearing 122. The axial direction of the fixing hole 123 extends along the radial direction of the measuring cylinder 12.

[0050] The measuring cylinder 12 is in a straight cylinder shape, and its diameter is the same as the diameter of the bottom of the locking sleeve 111, that is, the diameter of the measuring cylinder 12 is the same as the diameter of the connecting portion 1113.

[0051] The measuring cylinder 12 and the connecting portion 1113 are connected by a connecting stud 14. Specifically, a first internal thread is provided on the inner wall of the bottom of the connecting portion 1113, a second internal thread is provided on the inner wall of the top of the measuring cylinder 12, and a first external thread 141 that mates with the first internal thread and a second external thread 142 that mates with the second internal thread are provided on the connecting stud 14. Through the screwing connection of the first internal thread and the first external thread 141, and the screwing connection of the second internal thread and the second external thread 142, the connection between the connecting stud 14 and the measuring cylinder 12 and the connecting portion 1113 is realized respectively.

[0052] Furthermore, a demarcation plate 143 is provided between the first external thread 141 and the second external thread 142. The demarcation plate 143 divides the connecting stud 14 into the first external thread 141 and the second external thread 142 along its axial direction.

[0053] The handle 15 is arranged on the outer periphery of the measuring cylinder 12. The handle 15 facilitates the operation of the axle distance measuring device 1 by the operator. Specifically, the number of handles 15 is two. The two handles 15 are arranged corresponding to the two measuring holes 121, and there is a height difference between the two handles 15 along the axial direction of the measuring cylinder 12. That is, the two handles 15 are arranged at intervals along the axial direction of the measuring cylinder 12 and at intervals along the circumferential direction of the measuring cylinder 12. In this embodiment, the connection line between the handle 15 and the corresponding measuring hole 121 is parallel to the axis of the measuring cylinder 12. And among the two measuring holes 121, along the axial direction of the measuring cylinder 12, a handle 15 is provided above the lower measuring hole 121; a handle 15 is provided above the lower measuring hole 121.

[0054] Specifically, the handle 15 includes an operating part, a transition part, and a mounting part. The two transition parts are respectively arranged at both ends of the operating part, and the included angle between the transition part and the operating part is greater than 90 degrees. The two mounting parts are respectively arranged corresponding to the two transition parts, and the mounting part is parallel to the operating part.

[0055] Through holes are provided on the mounting part to realize the detachable connection between the handle 15 and the measuring cylinder 12 through fasteners.

[0056] The lifting rod 13 is arranged at the bottom end of the measuring cylinder 12 and can be lifted relative to the measuring cylinder 12 and be received in the measuring cylinder 12 or extend out of the measuring cylinder 12. The axis of the lifting rod 13 is on the same straight line as the axis of the measuring cylinder 12.

[0057] The lifting rod 13 includes a screw rod 131, an adjusting nut 132, and a fixing part 133. A lifting external thread is provided around the outer periphery of the screw rod 131, and the lifting external thread extends along the axis of the screw rod 131. The top part of the screw rod 131 is a smooth part, that is, no lifting external thread is provided. The screw rod 131 moves up and down along the axis of the measuring cylinder 12.

[0058] A groove 1311 extending along the axis of the screw rod 131 is further provided on the outer periphery of the screw rod 131.

[0059] An installation platform is provided at the bottom of the screw rod 131. In this embodiment, the installation platform is circular.

[0060] The adjusting nut 132 is sleeved on the bottom end of the measuring cylinder 12, and an adjusting thread adapted to the lifting external thread on the outer periphery of the screw rod 131 is provided inside it. When the adjusting nut 132 rotates on the outer periphery of the measuring cylinder 12, the screw rod 131 can be lifted to be received in the measuring cylinder 12 or extend out of the measuring cylinder 12.

[0061] Specifically, the adjusting nut 132 includes two nut units 1321. The nut unit 1321 is in a semi-cylindrical shape, and the two nut units 1321 enclose to form a cylindrical shape and are sleeved on the outer periphery of the measuring cylinder 12. Among them, in this embodiment, bolt holes are provided on the nut unit 1321, and the number of bolt holes is four. The detachable connection of the two nut units 1321 is realized through fasteners.

[0062] When the adjusting nut 132 is installed on the outer periphery of the measuring cylinder 12, the two independent nut units 1321 are respectively sleeved on the outer periphery of the measuring cylinder 12, and then the connection between the two is realized through fasteners, so that the adjusting nut 132 is sleeved on the outer periphery of the measuring cylinder 12.

[0063] The bottom of the adjusting nut 132 is in a stepped shape and is adapted to the step at the bottom of the measuring cylinder 12. And the adjusting nut 132 is sleeved on the outer periphery of the sliding bearing 122, so that the adjusting nut 132 is in sliding fit with the sliding bearing 122, avoiding the friction between the inner periphery of the adjusting nut 132 and the outer periphery of the measuring cylinder 12, and prolonging the service life of the adjusting nut 132 and the measuring cylinder 12.

[0064] The fixing member 133 can be inserted into the fixing hole 123 and the groove 1311 at the same time to fix the screw rod 131, avoiding the continuous rotation of the screw rod 131 after the lifting rod 13 is adjusted to the preset position from affecting the accuracy of the test data of the axle distance measuring device 1.

[0065] The working principle of the lifting rod 13 is as follows: Rotate the adjusting nut 132 around the sliding bearing 122, and the lifting external thread of the screw rod 131 cooperates with the adjusting thread of the adjusting nut 132 to make the screw rod 131 rotate, so that the screw rod 131 moves toward the measuring cylinder 12 and is received in the measuring cylinder 12 or the screw rod 131 extends downward out of the measuring cylinder 12 to realize lifting. Among them, the smooth part at the top of the screw rod 131 can prevent the screw rod 131 from moving downward and falling off from the adjusting nut 132.

[0066] When the lifting rod 13 is lifted or lowered to the preset position, insert the fixing member 133 into the fixing hole 123 and the groove 1311 to lock the lifting rod 13, avoid the continuous rotation of the screw rod 131, ensure the state of the axle distance measuring device 1 during distance measurement, and further ensure the accuracy of the measured data.

[0067] The bottom support 16 is arranged at the bottom end of the lifting rod 13. Specifically, the bottom support 16 is arranged at the bottom of the screw rod 131.

[0068] The two ends of the bottom support 16 along its own length direction are provided with accommodation grooves 161, that is, the number of accommodation grooves 161 is two, and they are respectively arranged at both ends.

[0069] There is also a slit 162 opened between the two accommodating grooves 161. The slit 162 extends from the top to the bottom, so that there is a gap between the side walls on both sides of the slit 162 along the width direction of the bottom support 16. And the slit 162 communicates with the two accommodating grooves 161, that is, the accommodating groove 161 has an opening.

[0070] There is also a fastening hole 163 provided on the bottom support 16. The fastening hole 163 extends along the width direction of the bottom support 16 and penetrates the bottom support 16. And the fastening hole 163 communicates with the slit 162.

[0071] The fastener 164 is inserted into the fastening hole 163 to adjust the distance between the side walls on both sides of the slit 162, and then adjust the distance between the side walls at the opening of the accommodating groove 161, so as to adjust the size of the accommodating groove 161.

[0072] One of the accommodating grooves 161 is adapted to the mounting table at the bottom of the screw rod 131 to realize the connection between the bottom support 16 and the screw rod 131. By adjusting the fastener 164, the screw rod 131 enters the accommodating groove 161 and is locked in the accommodating groove 161 to realize the connection between the bottom support 16 and the screw rod 131. When the lifting rod 13 is installed with the bottom support 16, the bottom support 16 is perpendicular to the lifting rod 13.

[0073] The level gauge 17 is installed in the other accommodating groove 161 relative to the lifting rod 13 for measuring the levelness of the bottom support 16. The level gauge 17 is locked in the corresponding accommodating groove 161 by the action of the fastener 164. In this embodiment, the level gauge 17 is a bubble level.

[0074] The levelness of the bottom support 16 is ensured by the level gauge 17. At the same time, the lifting rod 13 is perpendicular to the bottom support 16, that is, the axis of the lifting rod 13 extends in the vertical direction, and the axes of the locking sleeve 111, the measuring cylinder 12 and the lifting rod 13 are located on the same straight line, that is, it is ensured that the axis of the axle distance measuring device 1 extends vertically.

[0075] Taking the vertically extending measuring cylinder 12 as the measurement reference zero position or reference plane, and the position of the measuring cylinder 12 is not affected by the environment, so the axle distance of the semi-trailer can be accurately measured.

[0076] The distance measuring member and the measuring cylinder 12 together form a side beam mechanism, and the distance measuring member is arranged corresponding to the measuring cylinder 12. In this embodiment, the distance measuring member includes a laser rangefinder 19 and a measuring hanging ring 18.

[0077] The number of the laser rangefinders 19 is two, which are arranged corresponding to the two measuring holes 121 on the measuring cylinder 12. The laser rangefinder 19 is arranged inside the measuring cylinder 12 and emits a measuring beam, that is, a laser beam, through the measuring hole 121.

[0078] The laser rangefinder 19 emits laser beams towards the axles on both the left and right sides of the semi-trailer, thereby obtaining the wheelbase on both sides, and thus obtaining the wheelbase difference.

[0079] The laser rangefinder 19 is arranged corresponding to the two measuring holes 121. Therefore, the laser rangefinder 19 is located at different heights in the axial direction of the measuring cylinder 12, so that the wheelbase measuring device 1 can measure semi-trailers at different heights, improving the compatibility of the wheelbase measuring device 1.

[0080] Among them, with the starting point of the emitted laser beam as the reference point, the laser rangefinder 19 measures the distance between the reference point and the axle, that is, the wheelbase.

[0081] The measuring hanging rings 18 are arranged on the handle 15. In this embodiment, the number of the measuring hanging rings 18 is four, which are respectively arranged corresponding to the two handles 15, that is, two measuring hanging rings 18 are respectively arranged on each handle 15.

[0082] Specifically, the two measuring hanging rings 18 are respectively arranged at both ends of the operating part. And the measuring hanging rings 18 are arranged obliquely and towards the other end, that is, the measuring hanging ring 18 arranged at the top end of the handle 15 inclines towards the bottom end, and the measuring hanging ring 18 arranged at the bottom end of the handle 15 inclines towards the top end.

[0083] Specifically, the measuring hanging ring 18 includes two hanging rods connected to each other. The other ends of the two hanging rods that are not connected are connected to the handle 15 to realize the connection between the measuring hanging ring 18 and the handle 15. The included angle between the two hanging rods is less than 90 degrees, so that the connection point between the two hanging rods forms a reference point. That is, with this reference point as the measuring reference zero position, the distance between the measuring reference point and the axle is measured, so as to obtain the wheelbase. Specifically, the distance between the reference point and the axle can be measured by a flexible steel tape.

[0084] The four measuring hanging rings 18 are located at different heights in the axial direction of the measuring cylinder 12, so that the wheelbase measuring device 1 can measure semi-trailers at different heights, improving the compatibility of the wheelbase measuring device 1.

[0085] Furthermore, the two laser rangefinders 19 and the four measuring hanging rings 18 are all located at different heights in the axial direction of the measuring cylinder 12, so that the wheelbase measuring device 1 can measure semi-trailers at different heights, further improving the compatibility of the wheelbase measuring device 1. And the wheelbase measuring device 1 takes into account both the laser ranging method and the physical ranging method. In other embodiments, the distance measuring member can be provided with only the laser rangefinder 19 or only the measuring hanging ring 18 according to the actual situation.

[0086] In this embodiment, the wheelbase measuring device 1 is locked with the kingpin 2 through the locking mechanism 11, so that the bottom support 16 is in a horizontal position and abuts against the ground through the bottom support 16, making the wheelbase measuring device 1 stable between the ground and the kingpin 2, and making the locking mechanism 11, the measuring cylinder 12 and the lifting rod 13 extend in the vertical direction. The wheelbase is measured with the measuring cylinder 12 as the reference, so that the wheelbase measuring device 1 is not easily affected by the external environment during the wheelbase measurement, and the measurement data is relatively accurate. Moreover, the wheelbase measuring device 1 can be quickly locked with the kingpin 2 through the locking mechanism 11, and the height of the wheelbase measuring device 1 can be adjusted through the lifting rod 13 to quickly adjust to make the measuring cylinder 12 the measurement reference zero position or reference plane, and the wheelbase can be quickly measured, thereby improving the measurement efficiency.

[0087] The wheelbase measurement method of the wheelbase measuring device 1 is as follows:

[0088] S1. Sleeve the locking mechanism 11 on the outer periphery of the kingpin 2 of the semi-trailer and lock the kingpin 2.

[0089] Specifically, rotate the locking nut 112 downward to make the sector units 1114 move away from each other. Hold the wheelbase measuring device 1 by the handle 15, sleeve the locking sleeve 111 on the outer periphery of the bottom of the kingpin 2, and then rotate the locking nut 112 upward to make the sector units 1114 approach each other, thereby locking the kingpin 2 in the locking sleeve 111.

[0090] S2. Adjust the lifting rod 13 to make the lifting rod 13 extend downward, so that the bottom support 16 is close to the ground.

[0091] Specifically, rotate the adjusting nut 132 to make the screw rod 131 extend downward, so that the bottom end surface of the bottom support 16 is close to the ground.

[0092] S3. Adjust the position of the bottom support 16 and, through the measurement of the level gauge 17, place the bottom support 16 horizontally on the ground.

[0093] Specifically, adjust the position of the bottom support 16 in the front, rear, left and right directions, and through the measurement of the level gauge 17, make the bottom support 16 in a horizontal position. In this embodiment, when the bubble in the level gauge 17 is at the central position, it means that the bottom support 16 is in a horizontal position.

[0094] S4. Adjust the lifting rod 13 to make the lifting rod 13 continue to extend downward, so that the bottom support 16 abuts tightly against the ground.

[0095] After it is determined that the bottom support 16 is in a horizontal position, rotate the adjusting nut 132 to make the screw rod 131 continue to extend downward, so that the bottom support 16 abuts tightly against the ground. Then, insert the fixing member 133 into the groove 1311 of the screw rod 131 and the fixing hole 123 of the measuring cylinder 12 to lock the screw rod 131, thereby locking the measuring cylinder 12.

[0096] That is, after the bottom support 16 is in the horizontal position, at the same time, the screw rod 131 is perpendicular to the bottom support 16, and the axes of the screw rod 131, the measuring cylinder 12, and the locking sleeve 111 are all on the same straight line, thereby ensuring that the measuring cylinder 12 extends vertically.

[0097] S5. Taking the distance measuring member as the reference point, measure the distance between the axle of the semi-trailer and the distance measuring member.

[0098] Specifically, the wheelbase can be measured by the laser rangefinder 19 or the measuring hanging ring 18 respectively.

[0099] When measuring the wheelbase with the laser rangefinder 19, start the laser rangefinder 19, align it with the same positioning points on the left and right wheel hubs of the axle respectively, obtain the left and right distance data, and compare the left and right distance data to obtain whether the wheelbase of the semi-trailer meets the standard, and guide the next adjustment of the vehicle wheelbase.

[0100] When measuring the wheelbase with the measuring hanging ring 18, measure the distances from the left and right axle wheel hubs to the measuring hanging ring 18 with a flexible steel tape respectively, and compare the left and right distance data to obtain whether the wheelbase of the semi-trailer meets the standard, and guide the next adjustment of the vehicle wheelbase.

[0101] The above wheelbase measuring method is locked by the locking mechanism 11 and the drawbar pin 2, and the ground is tightened by the bottom support 16. Since it is not easily interfered by the outside world when measuring the wheelbase, and it can be quickly loaded and unloaded, and the measuring cylinder 12 can be quickly adjusted to extend vertically, so that the data can be quickly measured, improving the measuring efficiency.

[0102] The second embodiment of the wheelbase measuring device

[0103] The difference between this embodiment and the first embodiment of the wheelbase measuring device is that: a notch is provided on the outer periphery of the measuring cylinder.

[0104] There is only one handle, which is arranged on the other side opposite to the notch of the measuring cylinder.

[0105] The distance measuring member is arranged in the measuring cylinder, and the distance measuring member is conical, and its diameter gradually increases from top to bottom. The top of the distance measuring member, that is, the conical part, constitutes the reference point.

[0106] That is, taking the top of the distance measuring member as the reference point, measure the distance from this reference point to the axle. Specifically, it is measured with a flexible steel tape. In this embodiment, the top of the distance measuring member is conical, and the flexible steel tape can start from the axle, and the reading point is the top of the distance measuring member, which can accurately and quickly read the wheelbase, further improving the measuring efficiency.

[0107] Other features of the wheelbase measuring device in this embodiment can refer to the first embodiment and will not be described in detail.

[0108] In the wheelbase measurement method of this embodiment, S1 to S4 are the same as those of the first embodiment of the wheelbase measurement device, and there are slight differences in S5.

[0109] Among them, in the specific steps of measuring the distance between the axle of the semi-trailer and the distance measuring part with the distance measuring part as the reference point in S5:

[0110] Taking the axle as the starting point of the flexible steel tape, measure the distance from the axle to the top of the distance measuring part, and read the reading on the flexible steel tape at the top of the distance measuring part, then the wheelbase can be obtained. By comparing the left and right distance data, it can be determined whether the wheelbase of the semi-trailer vehicle meets the standard, and it can guide the next adjustment of the vehicle wheelbase.

[0111] Although the present invention has been described with reference to several exemplary embodiments, it should be understood that the terms used are illustrative and exemplary, rather than restrictive. Since the present invention can be embodied in many forms without departing from the spirit or essence of the invention, it should be understood that the above-described embodiments are not limited to any of the foregoing details, but should be broadly construed within the spirit and scope defined by the appended claims. Therefore, all variations and modifications falling within the scope of the claims or their equivalents should be covered by the appended claims.

Claims

1. An axle distance measuring device for a semi-trailer, the semi-trailer including a drawbar pin, characterized in that, The axle distance measuring device includes: A locking mechanism, which is sleeved on the outer periphery of the bottom of the draw pin and can be locked with the draw pin; A measuring mechanism, which includes a measuring cylinder arranged at the bottom end of the locking mechanism and a distance measuring member arranged corresponding to the measuring cylinder. The inside of the measuring cylinder is hollow, and the axis of the measuring cylinder and the axis of the locking mechanism are on the same straight line; A lifting rod, which is arranged at the bottom end of the measuring cylinder and can lift relative to the measuring cylinder and be accommodated in the measuring cylinder or extend out of the measuring cylinder; the axis of the lifting rod and the axis of the measuring cylinder are on the same straight line; A bottom support, which is arranged at the bottom of the lifting rod and is perpendicular to the lifting rod; the bottom support abuts against the ground to make the axle distance measuring device stable between the ground and the draw pin; A level meter, which is installed on the bottom support and is used to measure the levelness of the bottom support; When the locking mechanism is locked and connected with the draw pin and the bottom support is in a horizontal state, the distance measuring member is used to measure the distance between the axle of the semi-trailer and the draw pin with it as the reference point.

2. The wheelbase measuring device according to claim 1, wherein A measuring hole is opened on the side wall of the measuring cylinder; the distance measuring member is arranged in the measuring cylinder, corresponding to the measuring hole, and can emit a measuring beam through the measuring hole to the axle of the semi-trailer, so as to measure the distance between the axle of the semi-trailer and the distance measuring member.

3. The wheelbase measuring device according to claim 2, wherein Along the axis direction of the measuring cylinder, two measuring holes are arranged at intervals; the number of the distance measuring members is two, corresponding to the two measuring holes.

4. The wheelbase measuring device according to claim 1, characterized in that A measuring hole is opened on the side wall of the measuring cylinder; the distance measuring member is arranged in the measuring cylinder and corresponds to the measuring hole. The caliber of the distance measuring member gradually increases from top to bottom, and the top of the distance measuring member constitutes the reference point.

5. The wheelbase measuring device according to claim 1, wherein A measuring hanging ring is arranged on the outer periphery of the measuring cylinder, and the reference point is arranged on the measuring hanging ring.

6. The wheelbase measuring device according to claim 5, wherein A plurality of measuring hanging rings are arranged along the axis direction of the measuring cylinder.

7. The wheelbase measuring device according to claim 1, wherein, The lifting rod includes: A screw rod, with a lifting external thread arranged on the outer periphery, and the lifting external thread extends along the axis of the screw rod; An adjusting nut, which is sleeved on the bottom end of the measuring cylinder. The adjusting nut is provided with an adjusting thread adapted to the lifting external thread, so that the screw rod can be lifted to be accommodated in the measuring cylinder or extend out of the measuring cylinder.

8. The wheelbase measuring device according to claim 7, characterized in that, A groove is opened on the outer periphery of the screw rod, and the groove extends along the axis direction of the screw rod; A fixing hole is arranged at the bottom of the measuring cylinder; The lifting rod further includes a fixing member; the fixing member can be inserted into the fixing hole and the groove at the same time to fix the screw rod.

9. The wheelbase measuring device according to claim 7, characterized in that, The adjusting nut includes two nut units; the nut units are in a semi-cylindrical shape, and the two nut units enclose to form a cylindrical shape and are sleeved on the outer periphery of the measuring cylinder, and the two nut units are detachably connected through a fastener.

10. The wheelbase measuring device according to claim 7, characterized in that, The bottom of the measuring cylinder is in a stepped shape, the bottom of the adjusting nut is in a stepped shape, and the adjusting nut is adapted to the bottom of the measuring cylinder; A sliding bearing is further arranged between the adjusting nut and the measuring cylinder, and the sliding bearing is sleeved on the stepped part of the measuring cylinder.

11. The wheelbase measuring device according to claim 1, characterized in that, The locking mechanism includes: The locking sleeve is cylindrical, hollow inside, and has a plurality of sector units arranged circumferentially at its top; the plurality of sector units can approach or move away from each other to allow the draw pin to enter the locking sleeve or lock the draw pin; an external thread is provided on the outer circumference of the locking sleeve, and the external thread is located below the sector units; The lock nut is sleeved on the outer circumference of the locking sleeve and is provided with an internal thread adapted to the external thread, and can be rotated up to the sector units to make the plurality of sector units approach or rotated down to make the plurality of sector units move away from each other.

12. The wheelbase measuring device according to claim 1, wherein, Both ends of the bottom support along its length direction have accommodation grooves for accommodating the lifting rod and the level gauge respectively. There is a slit between the two accommodation grooves, and the slit extends from the top to the bottom of the bottom support; The bottom support is provided with fastening holes extending along the width direction of the bottom support. The fastening holes communicate with the slit, and the side walls on both sides of the slit are locked by fasteners to lock the lifting rod and the level gauge in the corresponding accommodation grooves.

13. A method for measuring the wheelbase of a semi-trailer, characterized in that, Adopt the axle distance measuring device according to any one of claims 1 to 12; The locking mechanism is sleeved on the outer circumference of the draw pin of the semi-trailer and the draw pin is locked; Adjust the lifting rod to extend the lifting rod downward so that the bottom support is close to the ground; Adjust the position of the bottom support and, through the measurement of the level gauge, place the bottom support horizontally on the ground; Adjust the lifting rod to continue to extend the lifting rod downward so that the bottom support presses tightly against the ground to make the axle distance measuring device stable between the ground and the draw pin; Taking the distance measuring piece as a reference point, measure the distance between the axle of the semi-trailer and the distance measuring piece.

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