CN220091908U - Pole piece coating device - Google Patents

Abstract

The utility model discloses a pole piece coating device, which comprises a pole piece driving roller, a slurry coating die head and a coating interval measuring mechanism, wherein the slurry coating die head is arranged at the outer side of the pole piece driving roller, the pole piece driving roller drives a pole piece to be coated to move, the slurry coating die head coats slurry to the pole piece supported by the pole piece driving roller, and the coating interval measuring mechanism measures the interval between the pole piece driving roller and the slurry coating die head through a telescopic measuring end; the coating interval measuring mechanism comprises a mounting bracket, an interval measuring piece and a zero point calibrating piece, wherein the mounting bracket and the slurry coating die head are arranged outside the pole piece driving roller in parallel, the interval measuring piece is arranged on the mounting bracket, the zero point calibrating piece is detachably arranged on the slurry coating die head, the telescopic measuring end of the interval measuring piece is abutted to the zero point calibrating piece, and the tail end of one side of the zero point calibrating piece, which is close to the pole piece driving roller, of the slurry coating die head is calibrated to be the measuring zero point of the telescopic measuring end of the interval measuring piece. The utility model is used for coating slurry on the lithium battery pole piece substrate.

Description

Pole piece coating device

Technical Field

The utility model relates to the technical field of lithium battery production equipment, in particular to a pole piece coating device.

Background

Lithium batteries are a commonly used power supply device, and for example, a power battery on an electric automobile adopts the lithium battery. The lithium battery comprises a positive plate, a negative plate, a diaphragm, electrolyte and other structures, wherein the positive plate and the negative plate are important components of the lithium battery. The positive plate and the negative plate are both formed by coating sizing agent on a base material, and then baking, rolling and other steps, wherein when the sizing agent is coated on the base material, the sizing agent coating thickness, uniformity and the like directly influence the performances of the plate and the lithium battery. The pole piece coating slurry generally adopts a driving roller to support the pole piece substrate and coats the slurry through a coating head coating mode, in order to control the slurry coating thickness, the distance between the coating head and the driving roller needs to be measured and controlled, the distance between the coating head and the driving roller is measured at present, a clearance between the coating head and the driving roller is generally plugged by a clearance gauge, but the mode is inconvenient to operate, and because different methods of plugging the clearance gauge by different operators cause larger human errors, the measuring precision of the distance between the coating head and the driving roller is influenced, and therefore, the performance of the coated pole piece and lithium battery is influenced. For example, in the patent document 202211422289.7, in the method of double-sided precise coating of a battery pole piece for a laboratory, the coating thickness of the pole piece is measured and controlled by a feeler gauge, so that the operation is inconvenient, and the accuracy of measuring the distance between a coating head and a driving roller is affected because different feeler gauge plugging methods of different operators cause larger human errors, so that the performance of the coated pole piece and a lithium battery is affected.

Disclosure of Invention

The utility model provides a pole piece coating device which aims at solving the technical problems that the gap between a coating head and a driving roller is measured by plugging a clearance between the coating head and the driving roller by a clearance gauge, the operation is inconvenient, and the measurement precision of the gap between the coating head and the driving roller is affected due to larger human errors caused by different methods of plugging the clearance gauge by different operators, so that the performance of a coated pole piece and a lithium battery is affected.

In order to solve the technical problems, the technical scheme of the utility model is as follows: the pole piece coating device comprises a pole piece driving roller, a slurry coating die head and a coating interval measuring mechanism, wherein the slurry coating die head is arranged on the outer side of the pole piece driving roller, the pole piece driving roller drives a pole piece to be coated to move, the slurry coating die head coats slurry to a pole piece supported by the pole piece driving roller, and the coating interval measuring mechanism measures the interval between the pole piece driving roller and the slurry coating die head through a telescopic measuring end; the coating interval measuring mechanism comprises a mounting bracket, an interval measuring piece and a zero point calibration piece, wherein the mounting bracket and the slurry coating die head are arranged outside the pole piece driving roller in parallel, the interval measuring piece is arranged on the mounting bracket, the zero point calibration piece is detachably arranged on the slurry coating die head, the telescopic measuring end of the interval measuring piece is abutted to the zero point calibration piece, and the tail end of one side of the zero point calibration piece, close to the pole piece driving roller, of the slurry coating die head is calibrated to be the measuring zero point of the telescopic measuring end of the interval measuring piece.

Further, the zero point calibration piece comprises a fixed rod and a zero point calibration piece, the zero point calibration piece and the fixed rod are of an integrated structure, the fixed rod is detachably fixed on the slurry coating die, and the zero point calibration piece is used for calibrating a measuring zero point of a telescopic measuring end of the interval measuring piece.

Further, the dead lever of zero point calibration piece and zero point calibration piece connect into T shape structure, zero point calibration piece sets up in the dead lever front end, zero point calibration piece one side and thick liquids coating die head are close to pole piece driving roller one side butt, the flexible measuring end butt of zero point calibration piece another side and interval measurement piece.

Further, the coating spacing measuring mechanism further comprises a measurement control assembly, wherein the measurement control assembly blocks the telescopic measuring end of the spacing measuring element from being out of or avoiding the telescopic measuring end of the spacing measuring element.

Further, the measurement control assembly comprises an L-shaped blocking piece and a fixing screw, wherein the L-shaped blocking piece is fixed on the mounting bracket through the fixing screw, and the L-shaped blocking piece can be adjusted in position on the mounting bracket.

Further, a long hole is formed in the L-shaped blocking piece, the fixing screw is in threaded connection with the mounting bracket, and the fixing screw is inserted into the long hole in the L-shaped blocking piece.

Further, the fixed screw is a butterfly screw.

Further, the device also comprises a sliding adjusting plate, wherein the slurry coating die head and the coating interval measuring mechanism are arranged on the sliding adjusting plate, and the slurry coating die head and the coating interval measuring mechanism move along with the sliding adjusting plate to adjust the interval between the slurry coating die head and the pole piece driving roller.

Further, the slurry coating die head comprises an upper die head and a lower die head, and a pole piece slurry discharging flow channel is arranged between the upper die head and the lower die head.

Further, the installing support includes supporting seat and vertical mounting panel, the supporting seat sets up on the slip regulating plate, vertical mounting panel is fixed on the supporting seat, interval measurement spare sets up on vertical mounting panel.

The beneficial effects achieved by the utility model mainly comprise the following points: the pole piece coating device is provided with a coating interval measuring mechanism, the coating interval measuring mechanism is used for measuring the interval between the pole piece driving roller and the slurry coating die head in a telescopic manner through the telescopic measuring end, the interval between the pole piece driving roller and the slurry coating die head is convenient to measure, human errors caused by different ways of a plug gauge by different operators during the measurement of the plug gauge can be avoided, the accuracy of measuring the interval between the coating head and the driving roller is improved, and therefore the performance of the coated pole piece and a lithium battery can be guaranteed. The coating interval measuring mechanism is provided with an interval measuring piece and a zero point calibration piece, the telescopic measuring end of the interval measuring piece is abutted with the zero point calibration piece during zero point calibration operation, the zero point calibration piece is used for calibrating the tail end position of one side of the slurry coating die head, which is close to the pole piece driving roller, to be the measuring zero point of the telescopic measuring end of the interval measuring piece, and the interval between the pole piece driving roller and the slurry coating die head can be measured more accurately through the measuring zero point of the interval measuring piece, so that the pole piece slurry coating thickness and the performance of a lithium battery are controlled better.

Drawings

FIG. 1 is a schematic diagram of a pole piece coating device in an embodiment of the utility model;

FIG. 2 is a schematic diagram of a mechanism for measuring the coating pitch of a pole piece coating device according to an embodiment of the present utility model;

FIG. 3 is a schematic structural view of a zero calibration member of a coating spacing measurement mechanism according to an embodiment of the present utility model;

FIG. 4 is a schematic diagram of a structure of a measurement control assembly blocked outside a spacing measurement member when a pole piece coating device coats pole pieces in an embodiment of the utility model;

FIG. 5 is an enlarged schematic view of the portion A in FIG. 4;

FIG. 6 is a schematic diagram of a measurement control assembly avoidance distance measurement member when the distance measurement member of the pole piece coating device in an embodiment of the utility model is calibrated to zero;

FIG. 7 is an enlarged schematic view of the portion B in FIG. 6;

FIG. 8 is a schematic structural view of a coating space measuring mechanism of a pole piece coating device for measuring the space between a pole piece driving roller and a slurry coating die head in an embodiment of the utility model;

fig. 9 is an enlarged schematic view of the portion C in fig. 8.

The drawings are for illustrative purposes only and are not to be construed as limiting the present patent; for the purpose of better illustrating the embodiments, certain elements of the drawings may be omitted, enlarged or reduced and do not represent the actual product dimensions; it will be appreciated by those skilled in the art that certain well-known structures in the drawings and descriptions thereof may be omitted; the same or similar reference numerals correspond to the same or similar components; the terms describing the positional relationship in the drawings are merely illustrative and should not be construed as limiting the present patent.

Detailed Description

For the purposes of explanation, numerous practical details are set forth in the following description, taken in conjunction with the accompanying drawings, to facilitate understanding of those of skill in the art. However, it should be understood that these practical details are not to be taken as limiting the utility model. That is, in some embodiments of the utility model, these practical details are unnecessary. In addition, for ease of understanding, some well known and conventional structures and components are shown in the drawings in a simplified schematic manner.

It should be noted that all directional indications such as up, down, left, right, front, and rear … … in the embodiments of the present utility model are merely used to explain the relative positional relationship, movement, etc. between the components in a particular posture such as that shown in the drawings, and if the particular posture is changed, the directional indication is changed accordingly. The use of terms such as "comprising," "including," "having," and variations thereof herein, are intended to encompass the elements listed thereafter and equivalents thereof as well as additional elements. Unless otherwise indicated, terms such as "mounted," "connected," "supported," and "coupled" and variations thereof are used in the broadest sense and encompass both direct and indirect combinations, connections, supports, and couplings. Furthermore, the terms "connected" and "coupled" are not restricted to physical or mechanical connections or couplings.

The description herein as relating to "first," "second," etc. is for descriptive purposes only and is not intended to specifically refer to order or sequence nor to limit the utility model, but is merely intended to distinguish between components or operations that are described in the same technical term and is not to be interpreted as indicating or implying a relative importance or implying any particular order of number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include at least one such feature. In addition, the technical solutions of the embodiments may be combined with each other, but it is necessary to base that the technical solutions can be realized by those skilled in the art, and when the technical solutions are contradictory or cannot be realized, the combination of the technical solutions should be considered to be absent and not within the scope of protection claimed in the present utility model.

Example 1

Referring to fig. 1 to 9, a pole piece coating device is used for coating slurry on a pole piece substrate of a lithium battery. The pole piece coating device comprises a pole piece driving roller 1, a slurry coating die head 2 and a coating interval measuring mechanism 3, wherein the pole piece driving roller 1 is used for conveying and supporting pole piece base materials and driving a pole piece to be coated to move. The slurry coating die head 2 is arranged on the outer side of the pole piece driving roller 1, and is used for coating slurry on the pole piece substrate supported by the pole piece driving roller 1. The coating interval measuring mechanism 3 measures the interval between the pole piece driving roller 1 and the slurry coating die head 2 through the telescopic measuring end, so that the slurry coating thickness is controlled. The coating interval measuring mechanism 3 comprises a mounting bracket 31, an interval measuring piece 32 and a zero point calibrating piece 33, wherein the mounting bracket 31 and the slurry coating die head 2 are arranged outside the pole piece driving roller 1 in parallel, the interval measuring piece 32 is arranged on the mounting bracket 31, the zero point calibrating piece 33 is detachably arranged on the slurry coating die head 2, the telescopic measuring end of the interval measuring piece 32 is abutted to the zero point calibrating piece 33 during zero point calibrating operation, and the tail end of one side of the slurry coating die head 2, which is close to the pole piece driving roller 1, is calibrated to be the measuring zero point of the telescopic measuring end of the interval measuring piece 32 by the zero point calibrating piece 33. The zero calibration element 33 may be a micrometer.

The pole piece coating device is provided with the coating interval measuring mechanism 3, the coating interval measuring mechanism 3 is used for measuring the interval between the pole piece driving roller 1 and the slurry coating die head 2 through the telescopic measuring end, the interval between the pole piece driving roller 1 and the slurry coating die head 2 is convenient to measure and operate, human errors caused by different plug gauge methods of different operators during the measurement with the plug gauge can be avoided, the measuring precision of the interval between the coating head and the driving roller is improved, and therefore the performance of the coated pole piece and a lithium battery can be guaranteed. The coating interval measuring mechanism 3 is provided with an interval measuring piece 32 and a zero point calibration piece 33, the telescopic measuring end of the interval measuring piece 32 is abutted against the zero point calibration piece 33 during zero point calibration operation, the zero point calibration piece 33 calibrates the tail end position of one side of the slurry coating die head 2, which is close to the pole piece driving roller 1, into the measuring zero point of the telescopic measuring end of the interval measuring piece 32, and the interval between the pole piece driving roller 1 and the slurry coating die head 2 can be measured more accurately through the measuring zero point of the interval measuring piece 32, so that the slurry coating thickness of the pole piece and the performance of a lithium battery can be controlled better.

Referring to fig. 3, 6 and 7, the zero calibration piece 33 includes a fixed rod 331 and a zero calibration piece 332, the zero calibration piece 332 and the fixed rod 331 are integrally formed, the fixed rod 331 is detachably fixed on the slurry coating die 2 through a screw, and the zero calibration piece 332 calibrates a measurement zero point of the telescopic measurement end of the distance measurement piece 32. Thus, when the measurement zero point of the telescopic measurement end of the distance measuring piece 32 is required to be calibrated, the zero point calibration piece 33 is mounted on the slurry coating die head 2, and when the measurement zero point of the telescopic measurement end of the distance measuring piece 32 is not required to be calibrated, the zero point calibration piece 33 is detached from the slurry coating die head 2. The dead lever 331 and the zero point of piece 33 are markd to zero point mark the piece 332 and are connected into T shape structure, zero point marks the piece 332 and sets up in the dead lever 331 front end, and when the measurement zero point of the flexible measurement end of mark interval measurement piece 32, zero point marks piece 332 one side and thick liquids coating die head 2 are close to pole piece driving roller 1 one side butt, zero point marks piece 332 another side and the flexible measurement end butt of interval measurement piece 32 to the measurement zero point of the flexible measurement end of interval measurement piece 32 is markd to the accuracy.

Referring to fig. 2, the coating space measuring mechanism 3 further includes a measurement control component 34, where when the measurement zero point of the telescopic measurement end of the space measuring member 32 is not required to be calibrated, the measurement control component 34 blocks the telescopic measurement end of the space measuring member 32, so as to prevent the telescopic measurement end of the space measuring member 32 from extending to affect the pole piece coating slurry; when the measurement zero point of the telescopic measurement end of the interval measurement member 32 needs to be calibrated, the measurement control assembly 34 avoids the telescopic measurement end of the interval measurement member 32, and the telescopic measurement end of the interval measurement member 32 extends out of the calibration zero point. The measurement control assembly 34 includes an L-shaped blocking piece 341 and a fixing screw 342, the L-shaped blocking piece 341 is screwed and fixed on the mounting bracket 31 by the fixing screw 342, and the L-shaped blocking piece 341 can be adjusted in position on the mounting bracket 31. The L-shaped blocking piece 341 is provided with a long hole, the fixing screw 342 is screwed on the mounting bracket 31, and the fixing screw 342 is inserted into the long hole on the L-shaped blocking piece 341, so that the L-shaped blocking piece 341 can move on the mounting bracket 31 through the long hole to block the outside of the telescopic measuring end of the distance measuring piece 32 or avoid the telescopic measuring end of the distance measuring piece 32. The fixing screw 342 is preferably a butterfly screw so that the fixing screw 342 is conveniently screwed to loosen or fix the L-shaped blocking piece 341.

Referring to fig. 1 to 9, before the pole piece coating device of this embodiment coats the slurry, when the measurement zero point of the telescopic measurement end of the spacing measurement member 32 needs to be calibrated, the zero point calibration member 33 is installed on the slurry coating die head 2, the measurement control assembly 34 adjusts to avoid the telescopic measurement end of the spacing measurement member 32, one side of the zero point calibration member 332 is abutted to one side of the slurry coating die head 2, which is close to the pole piece driving roller 1, the other side of the zero point calibration member 332 is abutted to the telescopic measurement end of the spacing measurement member 32, at this time, the position of the telescopic measurement end of the spacing measurement member 32, which extends out, is flush with one side of the slurry coating die head 2, which is close to the pole piece driving roller 1, and the position of the telescopic measurement end of the spacing measurement member 32, which extends out, is used as the zero point, so that the distance of the telescopic measurement end of the spacing measurement member 32, which extends out to the abutting position with the pole piece driving roller 1, is the distance between the pole piece driving roller 1 and the slurry coating die head 2. When the pole piece coating device coats sizing agent, the distance between the pole piece driving roller 1 and the sizing agent coating die head 2 is adjusted, the zero point calibration piece 33 is removed from the sizing agent coating die head 2, the measurement control assembly 34 is adjusted to the position where the telescopic measurement end of the blocking distance measurement piece 32 extends, the pole piece substrate is conveyed and supported through the pole piece driving roller 1 and driven to move, and the sizing agent coating die head 2 coats sizing agent on the pole piece substrate supported by the pole piece driving roller 1.

Example two

Referring to fig. 1 to 9, the whole pole piece coating device of the present embodiment is the same as that of the first embodiment, and a sliding adjusting plate 4 is provided on the basis of the first embodiment, the slurry coating die head 2 and the coating space measuring mechanism 3 are both provided on the sliding adjusting plate 4, and the slurry coating die head 2 and the coating space measuring mechanism 3 move along with the sliding adjusting plate 4 to adjust the space between the slurry coating die head 2 and the pole piece driving roller 1, so that the space between the slurry coating die head 2 and the pole piece driving roller 1 can be controlled to control the slurry coating thickness on the pole piece substrate supported by the pole piece driving roller 1. The slurry coating die head 2 comprises an upper die head 21 and a lower die head 22, wherein a pole piece slurry discharging flow passage is arranged between the upper die head 21 and the lower die head 22, and pole piece slurry flows out of the pole piece slurry discharging flow passage and is coated on a pole piece substrate supported by the pole piece driving roller 1.

Referring to fig. 1 to 9, before the pole piece coating device of this embodiment coats the slurry, when the measurement zero point of the telescopic measurement end of the spacing measurement member 32 needs to be calibrated, the zero point calibration member 33 is installed on the slurry coating die head 2, the measurement control assembly 34 adjusts to avoid the telescopic measurement end of the spacing measurement member 32, one side of the zero point calibration member 332 is abutted to one side of the slurry coating die head 2, which is close to the pole piece driving roller 1, the other side of the zero point calibration member 332 is abutted to the telescopic measurement end of the spacing measurement member 32, at this time, the position of the telescopic measurement end of the spacing measurement member 32, which extends out, is flush with one side of the slurry coating die head 2, which is close to the pole piece driving roller 1, and the position of the telescopic measurement end of the spacing measurement member 32, which extends out, is used as the zero point, so that the distance of the telescopic measurement end of the spacing measurement member 32, which extends out to the abutting position with the pole piece driving roller 1, is the distance between the pole piece driving roller 1 and the slurry coating die head 2. When the pole piece coating device coats sizing agent, the sliding adjusting plate 4 moves to adjust the distance between the pole piece driving roller 1 and the sizing agent coating die head 2, the zero calibration piece 33 is removed from the sizing agent coating die head 2 after calibrating the measurement zero point of the telescopic measurement end of the distance measurement piece 32, the measurement control component 34 is adjusted to a position where the telescopic measurement end of the distance measurement piece 32 stretches out, the pole piece substrate is transported and supported by the pole piece driving roller 1 and the pole piece to be coated is driven to move, and the sizing agent coating die head 2 coats sizing agent on the pole piece substrate supported by the pole piece driving roller 1.

Example III

Referring to fig. 1 to 9, the pole piece coating device of the present embodiment is the same as the whole and improves the structure of the mounting bracket 31 on the basis of the second embodiment, the mounting bracket 31 includes a supporting seat 311 and a vertical mounting plate 312, the supporting seat 311 is fixedly disposed on the sliding adjusting plate 4, the vertical mounting plate 312 is fixed on the supporting seat 311, and the spacing measuring piece 32 is disposed on the vertical mounting plate 312, so that the spacing measuring piece 32 can be stably mounted on the sliding adjusting plate 4, the slurry coating die head 2 and the coating spacing measuring mechanism 3 are both disposed on the sliding adjusting plate 4, and the spacing between the slurry coating die head 2 and the pole piece driving roller 1 is adjusted along with the movement of the sliding adjusting plate 4, so that the spacing between the slurry coating die head 2 and the pole piece driving roller 1 can be controlled.

It is to be understood that the above examples of the present utility model are provided by way of illustration only and not by way of limitation of the embodiments of the present utility model. Other variations or modifications of the above teachings will be apparent to those of ordinary skill in the art. It is not necessary here nor is it exhaustive of all embodiments. Any modification, equivalent replacement, improvement, etc. which come within the spirit and principles of the utility model are desired to be protected by the following claims.

Claims (10)

1. A pole piece coating device which is characterized in that: the device comprises a pole piece driving roller (1), a slurry coating die head (2) and a coating interval measuring mechanism (3), wherein the slurry coating die head (2) is arranged on the outer side of the pole piece driving roller (1), the pole piece driving roller (1) drives a pole piece to be coated to move, the slurry coating die head (2) coats slurry on a pole piece supported by the pole piece driving roller (1), and the coating interval measuring mechanism (3) measures the interval between the pole piece driving roller (1) and the slurry coating die head (2) through a telescopic measuring end; coating interval measuring mechanism (3) are including installing support (31), interval measurement spare (32) and zero point calibration spare (33), installing support (31) set up in the pole piece driving roller (1) outside side by side with thick liquids coating die head (2), interval measurement spare (32) set up on installing support (31), zero point calibration spare (33) can dismantle the setting on thick liquids coating die head (2), the flexible measurement end and the zero point calibration spare (33) butt of interval measurement spare (32), zero point calibration spare (33) are close to pole piece driving roller (1) one side end with thick liquids coating die head (2) and are marked to the measurement zero point of interval measurement spare (32) flexible measurement end.

2. The pole piece coating device of claim 1, wherein: zero point calibration piece (33) include dead lever (331) and zero point calibration piece (332), zero point calibration piece (332) and dead lever (331) are integrated into one piece structure, dead lever (331) can dismantle and fix on thick liquids coating die head (2), the measurement zero point of the flexible measurement end of interval measurement piece (32) is markd to zero point calibration piece (332).

3. The pole piece coating device of claim 2, wherein: the fixed rod (331) of zero point calibration piece (33) and zero point calibration piece (332) are connected into T-shaped structure, zero point calibration piece (332) set up in fixed rod (331) front end, zero point calibration piece (332) one side and thick liquids coating die head (2) are close to pole piece driving roller (1) one side butt, the flexible measuring end butt of zero point calibration piece (332) another side and interval measurement piece (32).

4. The pole piece coating device of claim 1, wherein: the coating interval measuring mechanism (3) further comprises a measuring control assembly (34), and the measuring control assembly (34) is blocked outside the telescopic measuring end of the interval measuring piece (32) or avoids the telescopic measuring end of the interval measuring piece (32).

5. The pole piece coating device of claim 4, wherein: the measurement control assembly (34) comprises an L-shaped blocking piece (341) and a fixing screw (342), the L-shaped blocking piece (341) is fixed on the mounting bracket (31) through the fixing screw (342), and the L-shaped blocking piece (341) can be adjusted in position on the mounting bracket (31).

6. The pole piece coating device of claim 5, wherein: the L-shaped blocking piece (341) is provided with a long hole, the fixing screw (342) is in threaded connection with the mounting bracket (31), and the fixing screw (342) is inserted into the long hole on the L-shaped blocking piece (341).

7. The pole piece coating device of claim 6, wherein: the fixed screw (342) is a butterfly screw.

8. The pole piece coating device according to any one of claims 1 to 7, characterized in that: still include slip regulating plate (4), thick liquids coating die head (2) and coating interval measuring mechanism (3) all set up on slip regulating plate (4), thick liquids coating die head (2) and coating interval measuring mechanism (3) are along with slip regulating plate (4) removal regulation with the interval of pole piece driving roller (1).

9. The pole piece coating device of claim 8, wherein: the slurry coating die head (2) comprises an upper die head (21) and a lower die head (22), and a pole piece slurry discharging flow passage is arranged between the upper die head (21) and the lower die head (22).

10. The pole piece coating device of claim 8, wherein: the mounting bracket (31) comprises a supporting seat (311) and a vertical mounting plate (312), wherein the supporting seat (311) is arranged on the sliding adjusting plate (4), the vertical mounting plate (312) is fixed on the supporting seat (311), and the interval measuring piece (32) is arranged on the vertical mounting plate (312).