Clearance Measuring Device

Abstract

The present invention provides a clearance measuring device. The clearance measuring device of the present invention includes: a pressing member, a fixing member, and a dial indicator; the fixing member includes a support plate, a first fixing column, and a second fixing column. The first fixing column and the second fixing column are arranged on the support plate at intervals along a preset direction, and the distance between the first fixing column and the second fixing column is equal to the hole pitch of the mounting holes on the journal box. The first fixing column and the second fixing column are respectively inserted into the mounting holes at the first end of the journal box to provide support points for the axial movement of the journal box; by fixing the first end of the pressing member on the support plate and the second end of the pressing member against the wheel, an axial displacement is generated in the journal box and the outer ring of the bearing that is interference-fitted with the journal box, and the axial clearance of the bearing is measured by using the dial indicator; thus, the axial clearance of the bearing can be accurately measured, and then it can be determined whether the axial clearance is within a preset range, so as to avoid affecting the subsequent assembly process.

Description

Technical Field

[0001] The present invention relates to the technical field of railway vehicle assembly, and particularly relates to a clearance measuring device. Background Art

[0002] The traction motor of the power car and locomotive of the rail vehicle set drives the wheel set through a transmission device. The installation methods of the traction motor are divided into axle-hanging type, car-body hanging type, and bogie hanging type. Among them, the axle-hanging type is widely used because of its advantages such as simple structure and convenient maintenance. Specifically, one end of the traction motor is rigidly clamped on the axle through an axle bearing, and the other end is elastically suspended on the cross beam or end beam of the bogie frame. Since the mass of the traction motor is generally supported on the frame, this installation method is also called semi-suspension.

[0003] Since the axial clearance of the axle bearing will affect the flexible rotation of the axle box body, the axial clearance of the axle bearing needs to be within a preset range. The inner ring of the axle bearing is in interference fit with the axle, and the outer ring of the axle bearing is in interference fit with the bearing seat of the axle box. Since there is no fixed support point when the axle box moves axially, the axial clearance of the axle bearing cannot be measured. In the prior art, usually the flatness of the end face of the inner ring of the axle bearing is measured to judge whether the axial clearance of the axle bearing is within the preset range. Specifically, the dial indicator is fixed on the side of the small end of the axle box through a magnetic base, the measuring head of the dial indicator contacts the end face of the inner ring of the axle bearing, and a copper hammer is used to strike the axle box to cause axial displacement of the axle box, so as to measure the flatness of the end face of the inner ring of the axle bearing.

[0004] However, affected by the assembly process of the axle bearing and the axle box and the measuring method of the flatness of the end face of the inner ring of the axle bearing, the flatness value of the end face of the inner ring of the axle bearing is inaccurate, resulting in an error in judging whether the axial clearance is within the preset range. Summary of the Invention

[0005] The present invention provides a clearance measuring device to solve the technical problem that the axial clearance of the rolling axle bearing cannot be accurately measured when the wheel set is placed horizontally in the prior art.

[0006] To solve the above problems, the present invention adopts the following technical solutions:

[0007] The present invention provides a clearance measuring device, which includes: a pressing member, a fixing member, and a dial indicator; the fixing member includes a support plate, a first fixing column, and a second fixing column, the first fixing column and the second fixing column are arranged at intervals on the support plate along a preset direction, and the distance between the first fixing column and the second fixing column is equal to the hole pitch of the mounting holes on the journal box, and the first fixing column and the second fixing column are respectively inserted into the mounting holes at the first end of the journal box; the first end of the pressing member is in contact with the support plate, and the second end of the pressing member is used to contact the wheel; the measuring head of the dial indicator is in contact with the end face of the second end of the journal box.

[0008] Compared with the prior art, the clearance measuring device provided by the first aspect of the present invention has the following advantages:

[0009] The clearance measuring device of the present invention includes a pressing member, a fixing member, and a dial indicator. Among them, the fixing member includes a support plate, and a first fixing column and a second fixing column arranged at intervals on the support plate along a preset direction. By inserting the first fixing column and the second fixing column into the mounting holes at the first end of the journal box, support points are provided for the axial movement of the journal box; by fixing the first end of the pressing member on the support plate and the second end of the pressing member against the wheel, axial displacement is generated in the journal box and the outer ring of the bearing that is interference-fitted with the journal box, and the axial clearance of the bearing is measured by using the dial indicator; in this way, the axial clearance of the bearing can be accurately measured, and then it can be determined whether the axial clearance is within a preset range, so as to avoid affecting the subsequent assembly process.

[0010] As an improvement of the above clearance measuring device of the present invention, the fixing member further includes a reinforcing plate, and the reinforcing plate is fixedly connected to the support plate.

[0011] As an improvement of the above clearance measuring device of the present invention, there are a plurality of the reinforcing plates, and the plurality of reinforcing plates are arranged at intervals along the preset direction.

[0012] As an improvement of the above clearance measuring device of the present invention, the reinforcing plate, the first fixing column, and the second fixing column are all welded to the support plate.

[0013] As an improvement of the above clearance measuring device of the present invention, an avoidance opening for avoiding the axle is provided on the first side of the support plate.

[0014] As an improvement of the above clearance measuring device of the present invention, an operation handle is provided on the second side of the support plate.

[0015] As an improvement to the above-mentioned clearance measuring device of the present invention, the abutting member includes an abutting seat and an abutting head. The first end of the abutting seat is used to abut against the wheel, and the second end of the abutting seat is threadedly connected to the first end of the abutting head; the second end of the abutting head abuts against the support plate.

[0016] As an improvement to the above-mentioned clearance measuring device of the present invention, the second end of the abutting head forms an abutting tip, and a mating concave pit that mates with the abutting tip is provided on the side of the support plate facing the wheel.

[0017] As an improvement to the above-mentioned clearance measuring device of the present invention, the clearance measuring device further includes a magnetic base, and the dial indicator is fixed on the gear mounted on the journal box through the magnetic base.

[0018] As an improvement to the above-mentioned clearance measuring device of the present invention, the clearance measuring device further includes a balance weight mounted on the support plate.

[0019] In addition to the technical problems solved by the present invention, the technical features constituting the technical solution, and the beneficial effects brought by these technical features of the technical solution described above, other technical problems that the clearance measuring device provided by the present invention can solve, other technical features included in the technical solution, and the beneficial effects brought by these technical features will be further described in detail in the specific implementation manner. Description of the Drawings

[0020] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for describing the embodiments of the present invention or the prior art. Obviously, the following drawings are only a part of the embodiments of the present invention. These drawings and the text description are not intended to limit the scope of the concept of the present disclosure in any way, but to illustrate the concept of the present disclosure to those skilled in the art by referring to specific embodiments. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0021] Figure 1 Schematic diagram of the use state of the clearance measuring device provided by the embodiment of the present invention;

[0022] Figure 2 Schematic diagram of the structure of the fixing member of the clearance measuring device provided by the embodiment of the present invention;

[0023] Figure 3 Left view of the fixing member of the clearance measuring device provided by the embodiment of the present invention.

[0024] Description of the reference numerals:

[0025] 1: Thrust member; 11: Thrust seat; 12: Thrust head; 121: Thrust tip; 122: Connection end;

[0026] 2: Fixing member; 21: Support plate; 211: Fitting pit; 22: First fixing column; 23: Second fixing column; 24: Reinforcing plate; 25: Avoidance opening; 26: Handle;

[0027] 3: Dial indicator; 31: Probe; 32: Gauge body;

[0028] 4: Magnetic base; 41: Adsorption seat; 42: Connection assembly;

[0029] 5: Axle box; 51: Small end bearing seat; 52: Large end bearing seat; 53: Mounting plate; 54: Boss;

[0030] 6: Wheel;

[0031] 7: Gear. Detailed implementation manner

[0032] The driving wheels of the power car and locomotive of the rail vehicle group are driven by a transmission device. The installation methods of the traction motor are divided into axle-hung type suspension, body suspension, and bogie suspension. Among them, the axle-hung type suspension is widely used due to its advantages such as simple structure and convenient maintenance. For example: DF4D, DF7C, DF8B, SS7C type locomotives. Specifically, for the axle-hung type suspension, one end of the traction motor is rigidly clamped to the axle through a bearing, and the other end is elastically suspended on the cross beam or end beam of the bogie frame. Since the mass of the traction motor is generally supported on the frame, this installation method is also called semi-suspension.

[0033] For the wheel set, axle box and bearing of DF4D, DF7C, DF8B, SS7C type locomotives, the vertical assembly process is adopted. Specifically, the assembly process includes:

[0034] Assemble the outer ring of the bearing to the large end bearing seat and small end bearing seat of the axle box by freezing method respectively, and check the clearance between the bearing and the bearing section;

[0035] Assemble the large end cover and large oil slinger to the axle, and hot-fit the inner sleeve of the large end bearing (including the ball) to the journal at the first end of the axle;

[0036] Vertically lift the axle box body and sleeve it on the corresponding position of the axle journal;

[0037] Hot-fit the inner sleeve of the small end bearing (including the ball) to the journal at the second end of the axle;

[0038] After assembling the small end bearing, it is required that the flatness of the outer end face of the inner sleeve of the small end bearing ≤0.10mm (taking the end face of the axle as the reference surface).

[0039] Generally, the distance between two wheels is fixed. If the axial clearance of the journal bearing is relatively large, the wheels may press the journal box to death, resulting in the journal box being unable to rotate flexibly or causing the bearing temperature to rise during the operation of the locomotive. Therefore, the axial clearance of the journal bearing needs to be within a given range. Among them, the bearing clearance is the gap between the rolling elements of the bearing and the inner and outer ring housings of the bearing. The so-called bearing clearance refers to the amount of movement when one of the inner or outer rings of the bearing is fixed and the unfixed side of the bearing clearance is moved radially or axially when the bearing is not installed on the shaft or bearing box. According to the moving direction, it can be divided into radial clearance and axial clearance.

[0040] Here, the structure of the journal box and the axle is described. In combination with Figure 1 , five journal boxes 5 are sleeved on the outside of the axle. It may include a barrel body, a small-end bearing seat 51 arranged at the first end of the barrel body, and a large-end bearing seat 52 arranged at the second end of the barrel body. Among them, an installation opening is provided at the top of the barrel body to expose the axle, so as to be connected to the traction motor. Mounting plates 53 are respectively arranged on both sides of the installation opening. Mounting holes are provided on the mounting plates 53 for mounting and fixing the traction motor. The outer diameter of the small-end bearing seat 51 is smaller than the outer diameter of the large-end bearing seat 52. Tapered roller bearings are respectively installed on the small-end bearing seat 51 and the large-end bearing seat 52. The outer ring of the tapered roller bearing is interference-fitted with the small-end bearing seat 51, and its inner ring is interference-fitted with the axle. A wheel 6 is installed at one end of the axle close to the small-end bearing seat 51, and a gear 7 is installed at one end of the axle close to the large-end bearing seat 52.

[0041] In order to ensure that the flatness of the outer side end face of the inner sleeve of the small-end bearing ≤ 0.10 mm, when the journal box is installed vertically, the dial indicator is fixed on the side of the small end of the journal box through a magnetic base, and the measuring head of the dial indicator contacts the end face of the inner ring of the journal bearing. The operator uses a copper hammer to strike the journal box to drive the inner sleeve of the small-end bearing to generate an axial displacement, so as to measure the flatness of the end face of the inner ring of the journal bearing.

[0042] Since there is no fixed support point when the journal box moves axially, the axial clearance of the small-end bearing cannot be measured. Usually, by adjusting the flatness of the end face of the inner sleeve of the small-end bearing to make the flatness of the inner sleeve of the small-end bearing ≤ 0.10 mm, a top member is used to top the journal box body to have a certain axial clearance within a preset range, so as to judge that the axial clearance of the journal bearing is within the preset range.

[0043] However, in the vertical assembly process, after the axle box is sleeved on the axle, due to the installation opening provided on the barrel of the axle box, the center of gravity of the axle box is shifted, that is, the central axis of the barrel of the axle box is not coincident with the central axis of the axle, so that the circumferential center of the small end face of the axle box does not coincide with the center of the axle, and a thrust will be generated due to the displacement of the small end of the axle box. Since the small end bearing of the axle box is a tapered roller bearing, after the small end bearing is hot-fitted, the rolling balls are in contact with the inclined surface of the outer ring of the bearing, and this thrust is perpendicular to the inclined surface of the outer ring of the bearing. This thrust will be decomposed into an upward axial component force and a horizontal component force. The upward axial component force causes axial displacement upward on one side of the small end bearing (this side is the same side as the installation opening), and finally the flatness of the inner ring of the small end bearing and the end face of the axle reaches 0.5-0.8 mm, which does not meet the process requirements (according to the process requirements, the flatness of the inner ring of the small end bearing does not exceed 0.10 mm). Finally, only by the above method of hammering with a copper hammer and continuously adjusting with a dial indicator can the process requirements be met, but this method is difficult to adjust and time-consuming and laborious.

[0044] Affected by the assembly process of the bearing box and the axle box and the measurement method of the flatness of the end face of the inner ring of the bearing box, the flatness value of the end face of the inner ring of the bearing box is inaccurate, so there is an error in the determination of whether the axial clearance is within the preset range, which in turn affects the subsequent assembly process.

[0045] To solve at least some of the above technical problems, an embodiment of the present invention provides a clearance measuring device.

[0046] The embodiments of the present invention are described in detail below. The examples of the embodiments are shown in the drawings, in which the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions from beginning to end. The embodiments described below by referring to the drawings are exemplary and are intended to explain the present invention and should not be construed as limiting the present invention.

[0047] Figure 1 Schematic diagram of the use state of the clearance measuring device provided by the embodiment of the present invention; Figure 2 Schematic diagram of the structure of the fixing member of the clearance measuring device provided by the embodiment of the present invention; Figure 3 Left view of the fixing member of the clearance measuring device provided by the embodiment of the present invention.

[0048] Refer to Figures 1 to 3, the clearance measuring device according to the embodiment of the present invention includes: a pressing member 1, a fixing member 2, and a dial indicator 3; the fixing member 2 includes a support plate 21, a first fixing column 22, and a second fixing column 23. The first fixing column 22 and the second fixing column 23 are arranged at intervals on the support plate 21 along a preset direction, and the distance between the first fixing column 22 and the second fixing column 23 is equal to the hole pitch of the mounting holes on the journal box 5. The first fixing column 22 and the second fixing column 23 are respectively inserted into the mounting holes at the first end of the journal box 5; the first end of the pressing member 1 is in contact with the support plate 21, the second end of the pressing member 1 is used to contact the wheel 6, and on the other side, the first end of the pressing member is in contact with 54, and the second end is in contact with the gear; the measuring head 31 of the dial indicator 3 is in contact with the end face of the second end of the journal box 5.

[0049] Specifically refer to Figure 2 and Figure 3 , the fixing member 2 includes a support plate 21, a first fixing column 22, and a second fixing column 23. Among them, the support plate 21 can be a circular plate, an oval plate, a polygonal plate, or an irregularly shaped plate structure, etc. The first fixing column 22 and the second fixing column 23 are both cylindrical structures, and they are in clearance fit with the mounting holes on the journal box 5, and the distance between the first fixing column 22 and the second fixing column 23 is equal to the hole pitch of the mounting holes on the journal box 5, so as to avoid the support plate 21 shaking due to the too small diameters of the first fixing column 22 and the second fixing column 23. The first fixing column 22 and the second fixing column 23 are arranged at intervals on the support plate 21 along a preset direction, where the preset direction is Figure 2 the X direction shown in, and in practical applications, the preset direction is the direction perpendicular to the axle 8, that is, the first fixing column 22 and the second fixing column 23 are respectively located on both sides of the axle 8.

[0050] There are various ways to fix the first fixing column 22 and the second fixing column 23 on the support plate 21. For example, the support plate 21 is provided with two fixing holes at intervals along the preset direction, and the first fixing column 22 and the second fixing column 23 are respectively in interference connection with the two fixing holes; for another example, the support plate 21 is provided with two threaded holes at intervals along the preset direction, the first fixing column 22 and the second fixing column 23 are respectively provided with external threads, and the first fixing column 22 and the second fixing column 23 are respectively threadedly connected to the two threaded holes; for another example, the first fixing column 22 and the second fixing column 23 are welded to the support plate 21. The embodiment of the present invention does not limit the fixing method of the first fixing column 22 and the second fixing column 23 here.

[0051] In one embodiment, the first fixing column 22 and the second fixing column 23 of the fixing member 2 are inserted into the mounting holes at the small end of the journal box 5 to provide a support point for the axial movement of the journal box 5. Combining Figure 1 , first, the side head 31 of the dial indicator 3 is in contact with the end face of the second end of the journal box 5. Then, the pressing member 1 on the right side ( Figure 1The two ends of the abutting member (shown by the dotted line in the figure) are respectively in contact with the gear 7 and the boss 54 of the journal box 5, pushing the journal box 5 to the left. At this time, the reading of the dial indicator 3 is the first value. Then, remove the right abutting member 1, and the first end of the left abutting member 1 in the figure is in contact with the support plate 21, and the second end of the abutting member 1 is used to contact the wheel 6, so as to axially push and move the journal box 5 and the outer ring of the bearing that is interference-fitted with the small-end bearing seat 51 of the journal box 5 to the large end of the journal box 5. At this time, the reading of the dial indicator 3 is the second value. The difference between the first value and the second value is the axial clearance of the journal bearing. Figure 1 The first end of the left abutting member in the figure is in contact with the support plate 21, and the second end of the abutting member 1 is used to contact the wheel 6, so as to axially push and move the journal box 5 and the outer ring of the bearing that is interference-fitted with the small-end bearing seat 51 of the journal box 5 to the large end of the journal box 5. At this time, the reading of the dial indicator 3 is the second value. The difference between the first value and the second value is the axial clearance of the journal bearing.

[0052] In the embodiment of the present invention, the abutting member 1 can be a conical tip, and the abutting member 1 can also be a tip with other structures, which is not limited herein. The dial indicator 3 includes a gauge body 32 and a probe 31. A shock-proof spring, a rack, a gear, a hairspring, a circular dial, a pointer, etc. are arranged in the gauge body 32. The dial indicator 3 can be an existing dial indicator structure, which is not limited in the embodiment of the present invention.

[0053] In one possible implementation manner, the clearance measuring device of the present invention further includes a balance weight (not shown in the figure) installed on the support plate 21.

[0054] The following details the use process of the clearance measuring device provided by the embodiment of the present invention:

[0055] In the above installation process, after vertically lifting the journal box body and sleeving it on the corresponding position of the axle journal and before hot-fitting the inner sleeve of the small-end bearing (including the balls) to the axle journal at the second end of the axle, insert the first fixing column 22 and the second fixing column 23 of the fixing member 2 into the installation holes of the journal box 5. It should be noted that the fixing member 2 is located on one side of the installation opening of the journal box 5, and a balance weight is placed on the support plate 21 to adjust the center of gravity of the journal box 5. Those skilled in the art can confirm that the center of gravity of the journal box 5 coincides with the center line of the axle 8 according to work experience. In this way, automatic positioning can be achieved by using the inclined surfaces of the balls and the outer ring of the bearing during the assembly of the small-end bearing, so as to control the flatness of the inner ring of the bearing within the range of 0.08 - 0.15 mm, so that there is an axial clearance in the journal bearing, avoiding the journal box from being stuck, and on this basis, it is relatively time-saving and labor-saving to control the flatness of the inner ring of the bearing within 0.1 mm.

[0056] Further, after the axle box 5, the wheel set, and the bearings are installed, the wheel set is placed horizontally to measure the axial clearance of the bearing at the small end. The first end of the abutting member 1 is abutted against the support plate 21, and the second end of the abutting member 1 is used to abut against the wheel 6, so that the bearing outer ring connected with interference fit to the small end bearing seat 51 of the axle box 5 axially abuts and moves along the axle 8 to the large end of the axle box 5. At this time, the probe head 31 of the dial indicator 3 is brought into contact with the end face of the second end of the axle box 5, so as to measure the second value of the small end bearing. If the measured axial clearance is within the preset range, subsequent installation is carried out; if the measured axial clearance exceeds the preset range, rework adjustment is required.

[0057] In this way, the fixing member 2 is installed once, which plays a role in balancing the center of the axle box 5 during the vertical installation of the bearing, and at the same time provides a support point for the horizontal measurement of the axial clearance, with simple and convenient operation, time-saving and labor-saving, and is beneficial to improving the assembly efficiency. The embodiment of the present invention solves the problem that when the axle box is assembled in a vertical position, due to the offset of the center of gravity, a certain amount of deformation occurs in the inner ring of the bearing during the assembly process, and repeated adjustment is required when adjusting the flatness, which is time-consuming and laborious; when placed horizontally, there is no effective support point for measuring the axial clearance of the bearing. When the inventor specifically applied the clearance measuring device, from March to December 2019, after using this clearance measuring device for operation, according to statistics, 198 pairs of DF4D type diesel locomotive wheel sets and axle boxes were assembled, and the assembly time was saved by up to one-fourth compared with that before use, effectively solving the problem that the axial clearance of the bearing cannot be measured when the wheel set is placed horizontally, and the effect is remarkable.

[0058] The clearance measuring device provided by the embodiment of the present invention includes an abutting member, a fixing member, and a dial indicator. Among them, the fixing member includes a support plate, a first fixing column, and a second fixing column that are arranged at intervals along a preset direction on the support plate. By inserting the first fixing column and the second fixing column into the mounting holes at the first end of the axle box, a support point is provided for the axial movement of the axle box; by fixing the first end of the abutting member on the support plate and abutting the second end of the abutting member against the wheel, the axle box and the bearing outer ring connected with interference fit to the axle box generate axial displacement, and the axial clearance of the bearing is measured by using the dial indicator; in this way, the axial clearance of the bearing can be accurately measured, and then it can be judged whether the axial clearance is within the specified range, so as to avoid affecting the subsequent assembly process.

[0059] The abutting member 1 abuts between the support plate 21 and the wheel 6. To prevent the support plate 21 from deforming or bending and affecting the measurement accuracy, the fixing member 2 of the embodiment of the present invention further includes a reinforcing plate 24, and the reinforcing plate 24 is fixedly connected to the support plate 21.

[0060] Specifically, the reinforcing plate 24 can be a polygonal plate or a plate with an irregular shape, etc., which is not limited herein. For example, the reinforcing plate 24 is a right trapezoidal plate structure, and its right angle side is fixed on the support plate 21. Optionally, the reinforcing plate 24 can be perpendicular to the support plate 21.

[0061] In this embodiment, a reinforcing plate 24 is arranged on the support plate 21 to increase the structural strength of the support plate 21, so as to avoid deformation or bending of the support plate 21 and affect the measurement of the axial clearance.

[0062] To further improve the structural strength of the support plate 21, there are multiple reinforcing plates 24, for example, two, three, four, etc., and the multiple reinforcing plates 24 are arranged at intervals along a preset direction. For example, along the X direction, two reinforcing plates 24 are arranged at intervals on the support plate 21. The specific number of the reinforcing plates 24 in the embodiment of the present invention is not limited.

[0063] In a preferred embodiment, the reinforcing plate 24, the first fixing column 22 and the second fixing column 23 are all welded to the support plate 21, so as to further improve the structural strength and rigidity of the fixing member 2, and the welding connection method is simple and efficient. The welding method in the embodiment of the present invention is not limited. For example, brazing, resistance welding, etc. Those skilled in the art can select according to the actual situations such as the materials of the support plate 21, the first fixing column 22, the second fixing column 23, and the reinforcing plate 24.

[0064] Further, the first fixing column 22 includes a first insertion portion and a first welding portion. Among them, the first insertion portion is used to be inserted into the mounting hole of the axle housing 5, and the first welding portion is used to be welded to the support plate 21. To ensure the stability of welding, the diameter of the first welding portion can be larger than the diameter of the first insertion portion; and / or, the second fixing column 23 includes a second insertion portion and a second welding portion. Among them, the second insertion portion is used to be inserted into the mounting hole of the axle housing 5, and the second welding portion is used to be welded to the support plate 21. To ensure the stability of welding, the diameter of the second welding portion can be larger than the diameter of the second insertion portion.

[0065] The materials of the support plate 21, the first fixing column 22, the second fixing column 23, and the reinforcing plate 24 in the embodiment of the present invention are not limited. Optionally, the support plate 21 and the reinforcing plate 24 are made of Q235B steel plates, and the first fixing column 22 and the second fixing column 23 are made of Q235B round steel, with low cost.

[0066] Continue to refer to Figure 2 , an avoidance opening 25 for avoiding the axle 8 is arranged on the first side of the support plate 21. Among them, the first side of the support plate 21 is recessed towards its second side to form the avoidance opening 25. The avoidance opening 25 can be an arc-shaped opening, a rectangular opening, etc. The shape of the avoidance opening 25 in the embodiment of the present invention is not limited. To avoid the avoidance opening 25 being too large and affecting the structural strength of the support plate 21, optionally, the avoidance opening 25 is an arc-shaped opening, and the diameter of the arc-shaped opening can be slightly larger than the diameter of the axle 8. Those skilled in the art can design according to experience, and the specific value of the diameter of the arc-shaped opening is not limited here.

[0067] In addition, for the convenience of the installation and disassembly of the fixing member 2, an operation handle 26 is provided on the second side of the support plate 21. The operation handle 26 may be a handle or a bracelet. The specific structure of the operation handle 26 is not limited in the embodiments of the present invention. For example, referring to Figure 2 , the operation handle 26 may be welded to the second side of the support plate 21, and there is an operation space between the operation handle 26 and the support plate 21. In this way, when balancing the center of gravity of the balance carrier housing 5, the balance weight can also be hung on the operation handle 26.

[0068] In a possible implementation manner, the abutting member 1 includes an abutting seat 11 and an abutting head 12. The first end of the abutting seat 11 is used to abut against the wheel 6, and the second end of the abutting seat 11 is threadedly connected to the first end of the abutting head 11. The second end of the abutting head 12 abuts against the support plate 21.

[0069] Specifically, the abutting seat 11 may be a cylindrical structure. Its first end abuts against the wheel 6, and its second end is threadedly connected to the abutting head 12, so that the distance between the two abutting ends of the abutting member 1 can be adjusted. A threaded hole may be provided at the second end of the abutting seat 11. Correspondingly, an external thread is provided at the first end of the abutting head 12; alternatively, an external thread may be provided at the second end of the abutting seat 11, and a threaded hole is provided at the second end of the abutting head 12 correspondingly.

[0070] In this embodiment, the abutting member 1 includes an abutting seat 11 and an abutting head 12. The distance between the two abutting ends of the abutting member 1 can be adjusted by the threaded connection between the abutting seat 11 and the abutting head 12, that is, the distance between the first end of the abutting seat 11 and the second end of the abutting head 12 can be adjusted, which is convenient for the installation of the abutting member 1 and can effectively abut against the support plate 21 and the wheel 6.

[0071] Further, a tip end 121 is formed at the second end of the abutting head 12, and a mating concave pit 211 that cooperates with the tip end 121 is provided on the side of the support plate 21 facing the wheel 6.

[0072] Specifically, the abutting head 12 includes a tip end 121 and a connecting end 122. The tip end 121 and the connecting end 122 are an integral part formed integrally. The connecting end 122 is used for threaded connection with the abutting seat 11, and the tip end 121 may be a cone, a pyramid, etc. The shape of the mating concave pit 211 matches the shape of the tip end 121.

[0073] In this embodiment, by forming the tip end 121 at the second end of the abutting head 12 to cooperate with the mating concave pit 211 on the support plate 21, it is avoided that the abutting seat 11 and the abutting head 12 slip when adjusting the distance by threaded rotation, and the support plate 21 cannot be effectively abutted, resulting in an axial clearance measurement error.

[0074] In one possible implementation, the backlash measurement device according to the embodiment of the present invention further includes a magnetic base 4, and the dial indicator 3 is fixed on the gear 7 installed on the bearing housing 5 through the magnetic base 4. Among them, the magnetic base 4 may include an adsorption base 41 and a connection component 42, and the connection component 42 is respectively connected to the adsorption base 41 and the dial indicator 3. The adsorption base 41 may be an existing magnetic adsorption base structure, which is not limited herein. The connection left key 42 may be a connecting rod assembly, which is not limited in the embodiment of the present invention either.

[0075] Fixing the dial indicator 3 by the magnetic base 4 according to the embodiment of the present invention is beneficial to improving the flexibility of the installation position of the dial indicator 3.

[0076] In the description of the present invention, it should be understood that in addition, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include at least one of the features. In the description of the present invention, the meaning of "a plurality" is at least two, such as two, three, etc., unless otherwise specifically defined.

[0077] In the above description, the description with reference to terms such as "one embodiment", "some embodiments", "example", "specific example", or "some examples" means that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described may be combined in a suitable manner in any one or more embodiments or examples. In addition, without contradiction, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of different embodiments or examples.

[0078] 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 them; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements for some or all of the technical features; and these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A clearance measuring device, characterized in that, it includes: a pressing member, a fixing member and a dial indicator; The fixing member includes a support plate, a first fixing column and a second fixing column. The first fixing column and the second fixing column are arranged at intervals on the support plate along a preset direction, and the distance between the first fixing column and the second fixing column is equal to the hole pitch of the mounting holes on the journal box. The first fixing column and the second fixing column are respectively inserted into the mounting holes at the first end of the journal box; The first end of the pressing member is in contact with the support plate, and the second end of the pressing member is used to be in contact with the wheel; The measuring head of the dial indicator is in contact with the end face of the second end of the journal box.

2. The clearance measuring device according to claim 1, characterized in that, The fixing member further includes a reinforcing plate, and the reinforcing plate is fixedly connected to the support plate.

3. The clearance measuring device according to claim 2, characterized in that, There are multiple reinforcing plates, and the multiple reinforcing plates are arranged at intervals along the preset direction.

4. The clearance measuring device according to claim 3, characterized in that, The reinforcing plate, the first fixing column and the second fixing column are all welded to the support plate.

5. The clearance measuring device according to claim 1, characterized in that, An avoidance opening for avoiding the axle is provided on the first side of the support plate.

6. The clearance measuring device according to claim 1, characterized in that, An operation handle is provided on the second side of the support plate.

7. The clearance measuring device according to any one of claims 1-6, characterized in that, The pressing member includes a pressing seat and a pressing head. The first end of the pressing seat is used to be in contact with the wheel, and the second end of the pressing seat is threadedly connected to the first end of the pressing head; the second end of the pressing head is in contact with the support plate.

8. The clearance measuring device according to claim 7, characterized in that, The second end of the pressing head forms a pressing tip, and a matching concave pit matching with the pressing tip is provided on the side of the support plate facing the wheel.

9. The clearance measuring device according to any one of claims 1-6, characterized in that, The clearance measuring device further includes a magnetic base, and the dial indicator is fixed on the gear installed on the journal box through the magnetic base.

10. The clearance measuring device according to any one of claims 1-6, characterized in that, The clearance measuring device further includes a balance weight installed on the support plate.

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