Bottle blank wall thickness difference measuring instrument capable of rotatably adjusting levelness of bottle blank

Abstract

The utility model discloses a bottle blank wall thickness difference measuring instrument capable of rotatably adjusting the levelness of a bottle blank. The bottle blank wall thickness difference measuring instrument is characterized by comprising a vertically arranged fixed block, one side of the fixing block is connected with a bottle ring supporting tool and an instrument supporting tool. The bottle blank supporting tool comprises a blank opening supporting tool for supporting the opening part of a bottle blank and a blank bottom supporting tool for supporting the bottom of the bottle blank, the blank opening supporting tool is connected to the fixing block, and the blank bottom supporting tool can rotate relative to the fixing block to adjust the position; the instrument supporting tool comprises a measuring instrument used for measuring the wall thickness of the bottle blank on the bottle blank supporting tool, and the measuring instrument is provided with at least two measuring points in the horizontal direction. When the bottle blank wall thickness difference measuring instrument needs to adjust the levelness of the bottle blank, the blank bottom supporting tool is directly rotated to enable the bottle blank to swing along with the rotation of the blank bottom supporting tool, so that the levelness adjustment of the bottle blank is realized, the bottle blank does not need to be taken down, and the levelness adjustment of the bottle blank is more convenient and efficient.

Description

Technical Field

[0001] This utility model belongs to the field of measuring instrument technology, specifically relating to a bottle preform wall thickness difference measuring instrument for rotating and adjusting the levelness of the bottle preform. Background Technology

[0002] A preform wall thickness difference measuring instrument is a specialized instrument for measuring the wall thickness difference of preforms. During measurement, the measuring instrument contacts the side wall of the preform, and by rotating the preform circumferentially, the wall thickness difference data in the circumferential direction is obtained. Before measuring the preform wall thickness difference, the preform needs to be in a horizontal position to ensure the accuracy of the measurement.

[0003] Existing bottle preform wall thickness difference measuring instruments adjust the levelness of the bottle preform by adjusting the position of the protrusion protruding from the lower cantilever. This adjustment method has the following drawbacks:

[0004] 1. In actual adjustment, it is often difficult to adjust the protrusion to the right position in one go. Each adjustment requires removing the preform and then putting it back on to check if it is level. This often requires repeated adjustments, which is time-consuming and labor-intensive, and affects measurement efficiency.

[0005] 2. Existing technology relies on visual observation to determine whether the preform is level. Furthermore, there is no preform for reference when adjusting the protrusion, which introduces significant human error and affects the accuracy of the measurement. Utility Model Content

[0006] In order to overcome at least some of the shortcomings of the prior art, this utility model provides a preform wall thickness difference measuring instrument for rotating and adjusting the levelness of the preform.

[0007] The technical solution provided by this utility model is as follows:

[0008] A bottle preform wall thickness difference measuring instrument for rotating and adjusting the levelness of a bottle preform is characterized by: comprising a vertically arranged fixed block; a bottle preform support fixture and an instrument support fixture are respectively connected to one side of the fixed block; the bottle preform support fixture includes a preform mouth support fixture for supporting the mouth of the bottle preform and a preform bottom support fixture for supporting the bottom of the bottle preform, the preform mouth support fixture is connected to the fixed block, and the preform bottom support fixture can be rotated relative to the fixed block for position adjustment; the instrument support fixture includes a measuring instrument for measuring the wall thickness of the bottle preform on the bottle preform support fixture, the measuring instrument having at least two measuring points along the horizontal direction.

[0009] As a further technical solution, the billet bottom support fixture extends through the billet opening support fixture, and there is a rotational space between the billet bottom support fixture and the billet opening support fixture for the billet bottom support fixture to rotate.

[0010] A further technical solution is as follows: the billet bottom support fixture includes a billet bottom support rod; one end of the billet bottom support rod is rotatably connected to the fixed block, the rotation axis of the billet bottom support rod is in the same horizontal plane and perpendicular to each other with the central axis of the billet mouth support fixture; the middle part of the billet bottom support rod extends through the billet mouth support fixture, and there is a rotation space between the billet bottom support rod and the billet mouth support fixture for the billet bottom support rod to rotate; the other end of the billet bottom support rod extends away from the fixed block, and a billet bottom support member is provided at the other end of the billet bottom support rod in the vertical direction, and the support head of the billet bottom support member protrudes above the billet bottom support rod to support the inner wall of the bottom of the bottle billet.

[0011] A further technical solution is as follows: the fixed block is provided with a fixed block rotation hole, the fixed block rotation hole is provided with a rotating block, the rotating block can rotate within the fixed block rotation hole, and the rotation axis of the rotating block is in the same horizontal plane and perpendicular to each other with the central axis of the billet support tool; one end of the billet bottom support rod is connected to the rotating block; a torsion column is also provided on the rotating block along its rotation axis, and the torsion column protrudes outside the fixed block.

[0012] As a further technical solution, the fixed block is provided with a fixed block rotation hole, the reference axis of the fixed block rotation hole is in the same horizontal plane and perpendicular to each other with the central axis of the billet support fixture; the billet bottom support fixture also includes a rotating shaft, one end of the rotating shaft is connected to one end of the billet bottom support rod, the middle part of the rotating shaft is rotatably connected to the fixed block rotation hole through a damping bearing, and the other end of the rotating shaft protrudes outside the fixed block.

[0013] As a further technical solution, one end of the billet bottom support rod is provided with a plurality of support rod rotating holes in sequence along the horizontal direction. The support rod rotating holes are arranged radially along the billet bottom support rod and are adapted to the rotating shaft. One end of the rotating shaft is connected to one of the support rod rotating holes.

[0014] A further technical solution is as follows: the billet mouth support fixture includes a horizontally arranged billet mouth support member; the billet mouth support member includes a support member body and a support member protrusion, the support member body is fixed to one side of the fixed block, the end face of the support member body away from the fixed block is the support end face, the support member protrusion is provided on the support end face, the support end face is used to support the end face of the bottle billet mouth, and the outer peripheral surface of the support member protrusion is used to support the inner wall of the bottle billet mouth; the billet mouth support member has a first through hole extending along the horizontal axis, the middle part of the billet bottom support rod extends through the first through hole, and there is a rotation space between the billet bottom support rod and the first through hole for the billet bottom support rod to rotate.

[0015] As a further technical solution, the instrument support fixture further includes a horizontally arranged instrument support rod, one end of which is fixed to one side of the fixing block, and the other end of which extends away from the fixing block; the instrument support rod has at least two instrument mounting positions along the horizontal direction, and the measuring instrument is installed in the instrument mounting position. After installation, the measuring instrument is set in the vertical direction, and the probe of the measuring instrument faces the preform support fixture.

[0016] As a further technical solution, the instrument support rod has at least two vertically arranged mounting through holes along the horizontal direction;

[0017] One of the measuring instruments is sequentially installed in at least two of the mounting through holes, or the measuring instrument is installed in at least two of the mounting through holes to form at least two measuring points.

[0018] As a further technical solution, the instrument support rod is provided with a mounting slot extending horizontally and arranged vertically; the measuring instrument has an unlocked state and an unlocked state.

[0019] When the instrument is unlocked, the measuring instrument can slide horizontally within the mounting slot;

[0020] When the instrument is locked, the measuring instrument is fixed in the mounting slot;

[0021] The measuring instrument switches between an unlocked state and a locked state to form at least two measuring points.

[0022] The beneficial effects of this utility model are as follows: When the bottle preform wall thickness difference measuring instrument needs to adjust the level of the bottle preform, it can directly rotate the bottom support fixture, causing the bottle preform to swing with the rotation of the bottom support fixture, thereby realizing the level adjustment of the bottle preform without removing the bottle preform, making the level adjustment of the bottle preform more convenient and efficient; in addition, the measuring instrument can measure two positions of the bottle preform in the horizontal direction, obtain the bottle preform wall thickness values ​​at the two positions in the horizontal direction, and can directly determine whether the bottle preform is in a horizontal state when it is mounted on the bottle preform support fixture. It can accurately measure the offset of the bottle preform in the horizontal direction through the measuring instrument, and adjust the level of the bottle preform according to the offset, making the adjustment more accurate and avoiding human error caused by visual observation. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of the structure of a preform wall thickness difference measuring instrument in Example 1;

[0024] Figure 2 This is a schematic diagram of the internal structure of a preform wall thickness difference measuring instrument in Example 1.

[0025] Figure 3 This is a schematic diagram of the internal structure of the billet support tooling in Example 1;

[0026] Figure 4 This is a schematic diagram of the internal structure of the fixing block in Embodiment 1;

[0027] Figure 5 This is a schematic diagram illustrating the principle of preform leveling adjustment in Example 1;

[0028] Figure 6 This is a schematic diagram of the structure of the preform wall thickness difference measuring instrument in Example 2;

[0029] Figure 7 This is a schematic diagram of the internal structure of the blank bottom support tooling in Example 3. Detailed Implementation

[0030] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings.

[0031] It should be noted that if any directional indication (such as up, down, left, right, front, back, top, bottom, inside, outside, vertical, horizontal, longitudinal, counterclockwise, clockwise, circumferential, radial, axial, etc.) is involved in the embodiments of this utility model, the directional indication is only used to explain the relative positional relationship and movement of each component in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indication will also change accordingly.

[0032] Furthermore, if the embodiments of this utility model involve descriptions such as "first" or "second," such descriptions are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, features defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or impossible to implement, such a combination of technical solutions should be considered non-existent and not within the scope of protection claimed by this utility model. Example 1:

[0033] like Figures 1 to 6As shown, this embodiment discloses a preform wall thickness difference measuring instrument for rotating and adjusting the level of a preform, including a base 1, a fixing block 2, a preform support fixture 3, and an instrument support fixture 4. The fixing block 2 is detachably connected to the base 1 in the vertical direction. The preform support fixture 3 and the instrument support fixture 4 are connected to one side of the fixing block 2. The instrument support fixture 4 is used to measure the wall thickness of the preform on the preform support fixture 3. The preform support fixture 3 and the instrument support fixture 4 are located on the same side of the fixing block 2. The preform support fixture 3 includes a preform mouth support fixture 31 for supporting the mouth of the preform and a preform bottom support fixture 32 for supporting the bottom of the preform. The preform mouth support fixture 31 is connected to the fixing block 2, and the preform bottom support fixture 32 can rotate relative to the fixing block 2 for position adjustment. When adjusting the level of the preform, it is only necessary to rotate the preform bottom support fixture 32 so that the preform swings with the rotation of the preform bottom support fixture 32 to achieve the level adjustment of the preform without removing the preform.

[0034] The instrument support fixture 4 includes a measuring instrument 42 for measuring the wall thickness of the preform on the preform support fixture 3. The measuring instrument 42 has at least two measuring points along the horizontal direction. By obtaining the preform wall thickness data from the two measuring points, the measuring instrument 42 can determine whether the preform is level on the preform support fixture 3. The measuring instrument 42 accurately measures the horizontal offset of the preform and adjusts the levelness of the preform based on this offset, making the adjustment more accurate and avoiding human error caused by visual observation.

[0035] The billet bottom support fixture 32 extends through the billet opening support fixture 31, and there is a rotation space between the billet bottom support fixture 32 and the billet opening support fixture 31 for the billet bottom support fixture 32 to rotate.

[0036] The billet bottom support fixture 32 includes a billet bottom support rod 321. One end of the billet bottom support rod 321 is rotatably connected to the fixed block 2. The rotation axis of the billet bottom support rod 321 is on the same horizontal plane and perpendicular to each other with the horizontal axis of the billet mouth support fixture 31. The middle part of the billet bottom support rod 321 extends through the billet mouth support fixture 31. There is a rotation space between the billet bottom support rod 321 and the billet mouth support fixture 31 for the billet bottom support rod 321 to rotate. The other end of the billet bottom support rod 321 extends away from the fixed block 2, and a billet bottom support member 322 is provided at the other end of the billet bottom support rod 321 in the vertical direction. The support head of the billet bottom support member 322 protrudes above the billet bottom support rod 321 to support the inner wall of the bottom of the bottle billet.

[0037] Specifically, the billet bottom support rod 321 can be rotated relative to the fixed block 2 for position adjustment. Therefore, the billet bottom support fixture 32 has an unlocked state and a locked state.

[0038] In the unlocked state, the billet bottom support fixture 32 can be rotated and adjusted relative to the fixed block 2;

[0039] In the locked state, the billet bottom support fixture 32 is fixed to the side of the fixing block 2.

[0040] Specifically, in the specific installation structure of the billet bottom support fixture 32: the right side of the fixing block 2 is provided with a fixing block mounting position 29, the fixing block 2 has a fixing block rotation hole 201 extending inward from its front side and communicating with the fixing block mounting position 29, the reference axis of the fixing block rotation hole 201 is in the same horizontal plane and perpendicular to each other with the central axis of the billet mouth support fixture 31; one end of the billet bottom support rod 321 is provided in the fixing block mounting position 29; the billet bottom support fixture 32 also includes a rotating shaft 326, one end of the rotating shaft 326 is connected to one end of the billet bottom support rod 321, the middle part of the rotating shaft 326 is rotatably connected to the fixing block rotation hole 201 through a damping bearing 329, and the other end of the rotating shaft 326 protrudes from the front side of the fixing block 2, which facilitates the rotation of the rotating shaft 326.

[0041] The rotating shaft 326 can rotate slightly within the mounting position 29 of the fixed block. The other end of the rotating shaft 326 is connected to a pointer. The front side of the fixed block 2 is provided with a rotation scale for indicating the rotation angle of the pointer.

[0042] The specific adjustment method is as follows: Place the preform onto the preform support fixture 3, such as... Figure 5 As shown, the wall thickness of the preform at two horizontal measuring positions is measured using measuring instrument 42. The difference in wall thickness, d, is obtained by subtracting the two wall thickness values. The horizontal distance between the two measuring positions is x. The horizontal distance between the measuring position farther from the fixing block 2 and the support position of the preform opening support fixture 31 is y1. The angle at which the preform should be rotated and adjusted is... The vertical distance that should be adjusted for the measuring position farther from the fixed block 2 is 'a'. Then, according to the relationship:

[0043] It can be known that ;

[0044] Because the rotation adjustment angle is generally small, the tilt angle of the preform bottom support 322 and the positional changes of the support head of the preform bottom support 322 relative to the inner wall of the preform bottom are relatively small during the rotation adjustment process, and will not have a significant impact on the measurement results, so they can be ignored. In this case:

[0045] The horizontal distance y between the measuring position farther from the fixed block 2 and the rotation axis of the billet bottom support fixture 32, and the rotation adjustment angle of the billet bottom support fixture 32 are as follows: Then, according to the relation:

[0046] The required rotation adjustment angle of the billet bottom support fixture 32 can be obtained. The value. The direction of rotation adjustment of the preform bottom support fixture 32 depends on the tilt direction of the preform.

[0047] More specifically, one end of the billet bottom support rod 321 is provided with a plurality of support rod rotating holes 3213 in sequence along the horizontal direction. The support rod rotating holes 3213 are arranged radially along the billet bottom support rod 321 and are adapted to the rotating shaft 326. One end of the rotating shaft 326 is connected to one of the support rod rotating holes 3213. The rotating shaft 326 is connected to different support rod rotating holes 3213 to adjust the length of the billet bottom support rod 321 extending out of the fixed block 2.

[0048] The billet mouth support fixture 31 includes a horizontally arranged billet mouth support member, which includes a support member body 311 and a support member protrusion 312. The support member body 311 is fixed to one side of the fixing block 2. The end face of the support member body 311 away from the fixing block 2 is the support end face 3111. The support member protrusion 312 is provided on the support end face 3111. The support end face 3111 is used to support the end face of the bottle billet mouth. The outer peripheral surface of the support member protrusion 312 is used to support the inner wall of the bottle billet mouth. The billet mouth support member has a first through hole 313 that runs through the horizontal axis. The middle part of the billet bottom support rod 321 extends through the first through hole 313. The vertical dimension of the first through hole 313 is larger than the outer diameter of the portion of the billet bottom support rod 321 located in the first through hole 313. There is a rotation space between the billet bottom support rod 321 and the first through hole 313 for the billet bottom support rod 321 to rotate.

[0049] Specifically, in the specific installation structure of the billet support 311, the right side of the billet support 311 is provided with a support mounting position 3112, and the left side of the support mounting position 3112 is provided with a support connecting hole 3113 that penetrates the billet support 311. Correspondingly, the right side of the fixing block 2 is provided with a first fixing block connecting hole 26. The connector is located in the support mounting position 3112 and cooperates with the support connecting hole 3113 and the fixing block 2 connecting hole respectively, thereby fixing the billet support fixture 31 to the right side of the fixing block 2.

[0050] Specifically, the support mounting position 3112 and the support connecting hole 3113 are two sets, respectively located at the upper and lower positions of the first through hole 313; the first fixing block connecting hole 26 is set corresponding to one set of support mounting position 3112 and support connecting hole 3113.

[0051] The instrument support fixture 4 also includes a horizontally arranged instrument support rod 41. One end of the instrument support rod 41 is detachably connected to the fixing block 2, and the other end extends away from the fixing block 2. The instrument support rod 41 has at least two instrument mounting positions 411 in the horizontal direction. The measuring instrument 42 is installed in the instrument mounting position 411. After installation, the measuring instrument 42 is set in the vertical direction, and the probe of the measuring instrument 42 faces the preform support fixture 3.

[0052] The instrument mounting position 411 on the instrument support rod 41 can be configured in the following two ways:

[0053] In the first case, the instrument support rod 41 has at least two vertically arranged mounting through holes along the horizontal direction; a measuring instrument 42 is installed in at least two mounting through holes in sequence, or a measuring instrument 42 is installed in at least two mounting through holes to form at least two measuring points.

[0054] The second type has an instrument support rod 41 with a mounting slot extending horizontally and arranged vertically; the measuring instrument 42 has an unlocked state and an unlocked state: in the unlocked state, the measuring instrument 42 can slide horizontally in the mounting slot; in the locked state, the measuring instrument 42 is fixed in the mounting slot; the measuring instrument 42 switches between the unlocked state and the locked state to form at least two measuring points.

[0055] In this embodiment, when the preform wall thickness difference measuring instrument adjusts the levelness of the preform, the preform is mounted on the preform support fixture 3. The measuring instrument 42 obtains the values ​​of the preform at two positions in the horizontal direction, which can directly determine whether the preform is level on the preform support fixture 3. If the measuring instrument 42 shows that the values ​​of the preform at the two positions in the horizontal direction are equal, the preform is level; if the measuring instrument 42 shows that the values ​​of the preform at the two positions in the horizontal direction are not equal, the preform is offset from the horizontal position. The offset of the preform is calculated based on the difference between the values ​​measured at the two positions, and the position of the preform support fixture 3 relative to the fixed block 2 can be adjusted. During the position adjustment of the preform support fixture 3, the preform mounted on the preform support fixture 3 will also adjust its position accordingly, without the need to remove the preform, making the levelness adjustment of the preform more convenient and efficient.

[0056] Among them, the measuring instrument 42 can be a dial indicator, a micrometer, etc.

[0057] Preferably, the outer peripheral surface of the preform support block 312 can also be set as an arc surface or a spherical surface, so that the preform can be placed at different angles to provide support. Example 2:

[0058] The specific implementation content of this embodiment is largely the same as that of Embodiment 1, the difference being in the specific installation structure of the billet bottom support fixture 32: as follows Figure 6As shown, an elongated oval-shaped rotating hole 202 is provided inside the fixed block 2, and a scale is set above the rotating hole 202. A rotating block 327 with a transition fit is provided inside the rotating hole 202. The rotating block 327 can rotate within the rotating hole 202, and its rotation axis is in the same horizontal plane and perpendicular to the central axis of the billet support. One end of the billet bottom support rod 41 is connected to the rotating block 327. A torsion column 328 is also provided on the rotating block 327 along its rotation axis and fixed thereto. The torsion column 328 protrudes outside the fixed block 2, and a pointer is provided at the upper end of the torsion column 328. When adjusting the levelness of the bottle billet, rotating the torsion column 328 causes the billet bottom support rod 321 to rotate synchronously, and the pointer indicates the rotation angle, thereby allowing for controllable adjustment of the height of the billet bottom support 322 on the billet bottom support rod 321. After adjustment, the rotating block 327 and the rotating hole 202 of the fixed block stop at the adjusted position due to friction. Example 3:

[0059] The specific implementation content of this embodiment is largely the same as that of the above embodiments, the difference being in the specific structure of the billet bottom support rod 321: as follows Figure 7 As shown, the preform bottom support rod 321 is an adjustable telescopic rod. By adjusting the length of the preform bottom support rod 321, it can be adapted to preforms of different lengths. The billet bottom support rod 321 includes a fixed support rod 323, a movable support rod 324, and a locking screw 325. The fixed support rod 323 has a sliding hole 3231 extending axially from one end face. The side wall of the fixed support rod 323 has a locking hole 3232 communicating with the sliding hole 3231. The side wall of the movable support rod 324 has a receiving groove 3241 extending parallel to the axis. One end of the movable support rod 324 enters through the opening of the sliding hole 3231. Part of the movable support rod 324 is fitted into the sliding hole 3231, and the other part of the movable support rod 324 is exposed outside the fixed support rod 323. The locking screw 325 abuts against the bottom of the receiving groove 3241 through the locking hole 3232 to fix the fixed support rod 323 to the movable support rod. When the locking screw 325 is unscrewed, the movable support rod 324 can slide relative to the fixed support rod 323, thereby realizing the length adjustment of the billet bottom support rod 321.

[0060] The above description is only a preferred embodiment of the present utility model. Any technical solution that achieves the purpose of the present utility model by essentially the same means shall fall within the protection scope of the present utility model.

Claims

1. A preform wall thickness difference measuring instrument for rotating and adjusting the levelness of the preform, characterized in that: It includes a vertically arranged fixing block; one side of the fixing block is respectively connected to a preform support fixture and an instrument support fixture; The preform support fixture includes a preform mouth support fixture for supporting the mouth of the preform and a preform bottom support fixture for supporting the bottom of the preform. The preform mouth support fixture is connected to the fixed block, and the preform bottom support fixture can be rotated relative to the fixed block for position adjustment. The instrument support fixture includes a measuring instrument for measuring the wall thickness of the preform on the preform support fixture, and the measuring instrument has at least two measuring points along the horizontal direction.

2. The bottle preform wall thickness difference measuring instrument for rotating and adjusting the levelness of the preform according to claim 1, characterized in that: The billet bottom support fixture extends through the billet opening support fixture, and there is a rotational space between the billet bottom support fixture and the billet opening support fixture for the billet bottom support fixture to rotate.

3. The preform wall thickness difference measuring instrument for rotating and adjusting the levelness of the preform according to claim 2, characterized in that: The billet bottom support fixture includes a billet bottom support rod; One end of the billet bottom support rod is rotatably connected to the fixed block, and the rotation axis of the billet bottom support rod is in the same horizontal plane and perpendicular to each other with the central axis of the billet opening support fixture. The middle part of the billet bottom support rod extends through the billet opening support fixture, and there is a rotation space between the billet bottom support rod and the billet opening support fixture for the billet bottom support rod to rotate. The other end of the blank bottom support rod extends away from the fixed block, and the other end of the blank bottom support rod is provided with a blank bottom support member in the vertical direction. The support head of the blank bottom support member protrudes above the blank bottom support rod to support the inner wall of the bottom of the bottle blank.

4. The preform wall thickness difference measuring instrument for rotating and adjusting the levelness of the preform according to claim 3, characterized in that: The fixed block is provided with a fixed block rotation hole, and a rotating block is provided in the fixed block rotation hole. The rotating block can rotate in the fixed block rotation hole, and the rotation axis of the rotating block is in the same horizontal plane and perpendicular to each other with the central axis of the billet support tool. One end of the billet bottom support rod is connected to the rotating block. The rotating block is also provided with a torsion column along its rotation axis, and the torsion column protrudes outside the fixed block.

5. The preform wall thickness difference measuring instrument for rotating and adjusting the levelness of the preform according to claim 3, characterized in that: The fixing block is provided with a fixing block rotation hole, and the reference axis of the fixing block rotation hole is in the same horizontal plane and perpendicular to each other with the central axis of the blank support tool; The billet bottom support fixture also includes a rotating shaft. One end of the rotating shaft is connected to one end of the billet bottom support rod. The middle part of the rotating shaft is rotatably connected to the rotating hole of the fixed block through a damping bearing. The other end of the rotating shaft protrudes from the fixed block.

6. The preform wall thickness difference measuring instrument for rotating and adjusting the levelness of the preform according to claim 5, characterized in that: One end of the billet bottom support rod is provided with a plurality of support rod rotating holes in sequence along the horizontal direction. The support rod rotating holes are arranged radially along the billet bottom support rod and are adapted to the rotating shaft. One end of the rotating shaft is connected to one of the support rod rotating holes.

7. The preform wall thickness difference measuring instrument for rotating and adjusting the levelness of the preform according to claim 3, characterized in that: The billet opening support fixture includes a horizontally arranged billet opening support component; The preform opening support includes a support body and a support protrusion. The support body is fixed to one side of the fixing block. The end face of the support body away from the fixing block is the support end face. The support protrusion is disposed on the support end face. The support end face is used to support the preform opening end face. The outer peripheral surface of the support protrusion is used to support the inner wall of the preform opening. The billet opening support has a first through hole extending along a horizontal axis, and the middle part of the billet bottom support rod extends through the first through hole. There is a rotation space between the billet bottom support rod and the first through hole for the billet bottom support rod to rotate.

8. The preform wall thickness difference measuring instrument for rotating and adjusting the levelness of the preform according to claim 1, characterized in that: The instrument support fixture also includes a horizontally arranged instrument support rod, one end of which is fixed to one side of the fixing block, and the other end of which extends away from the fixing block. The instrument support rod has at least two instrument mounting positions along the horizontal direction. The measuring instrument is installed in the instrument mounting position. After installation, the measuring instrument is set in the vertical direction, and the probe of the measuring instrument faces the preform support fixture.

9. A preform wall thickness difference measuring instrument for rotating and adjusting the levelness of the preform according to claim 8, characterized in that: The instrument support rod has at least two vertically arranged mounting through holes along the horizontal direction; One of the measuring instruments is sequentially installed in at least two of the mounting through holes, or the measuring instrument is installed in at least two of the mounting through holes to form at least two measuring points.

10. A preform wall thickness difference measuring instrument for rotating and adjusting the levelness of the preform according to claim 8, characterized in that: The instrument support rod is provided with a mounting through groove that extends horizontally and is arranged vertically. The measuring instrument has an unlocked state and an unlocked state: in the unlocked state, the measuring instrument can slide horizontally within the mounting slot; When the instrument is locked, the measuring instrument is fixed in the mounting slot; The measuring instrument switches between an unlocked state and a locked state to form at least two measuring points.

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