Bottle blank wall thickness difference measuring instrument capable of adjusting levelness of bottle blank in sliding manner
By using a bottle preform wall thickness difference measuring instrument that adjusts the level of the preform through sliding adjustment, the level of the preform can be adjusted efficiently and accurately, solving the problems of low efficiency and large error in the existing technology and improving the measurement accuracy.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- GUANG DONG XING LIAN PRECISE MACHINERY
- Filing Date
- 2025-05-17
- Publication Date
- 2026-05-12
Smart Images
Figure CN224230897U_ABST
Abstract
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 sliding adjustment of bottle preform level. 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 sliding adjustment of preform level.
[0007] The technical solution provided by this utility model is as follows:
[0008] A bottle preform wall thickness difference measuring instrument for sliding adjustment of bottle preform level includes 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 bottle preform opening and a preform bottom support fixture for supporting the bottle preform bottom. The preform mouth support fixture can slide vertically relative to the fixed block for position adjustment, and the preform bottom support fixture is connected to the fixed block. The instrument support fixture includes a measuring instrument for measuring the wall thickness of the bottle preform on the bottle preform support fixture, and the measuring instrument has at least two measuring points in the horizontal direction.
[0009] In a further technical solution, the billet bottom support fixture extends through the billet opening support fixture, and there is a sliding space between the billet bottom support fixture and the billet opening support fixture for the billet opening support fixture to slide in the vertical direction.
[0010] A further technical solution is that 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 end face of the support member body away from the fixed block is the support end face, the support member protrusion is disposed 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 billet mouth unlocked state and a billet mouth locked state.
[0011] When the billet opening is unlocked, the billet opening support can slide vertically on one side of the fixed block;
[0012] When the billet opening is locked, the billet opening support is fixed to one side of the fixing block.
[0013] In a further technical solution, the end face of the support body near the fixed block is a sliding end face, and a support slider is provided on the sliding end face; a fixed block groove adapted to the support slider is provided on one side of the fixed block in the vertical direction.
[0014] In the unlocked state of the billet opening, the billet opening support slides vertically on one side of the fixed block based on the cooperation between the support slider and the fixed block groove;
[0015] When the billet opening is locked, the support slider is fixed in the groove of the fixing block, thereby fixing the billet opening support to one side of the fixing block.
[0016] A further technical solution is that the billet bottom support fixture includes a horizontally arranged billet bottom support rod; the billet bottom support rod has a billet bottom unlocked state and a billet bottom locked state:
[0017] With the billet bottom unlocked, one end of the billet bottom support rod can slide horizontally within the fixed block;
[0018] With the billet bottom locked, one end of the billet bottom support rod is fixed inside the fixing block;
[0019] The billet opening support 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 sliding space between the billet bottom support rod and the first through hole for the billet opening support to slide in the vertical direction.
[0020] 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.
[0021] In a further technical solution, the billet bottom support rod is a telescopic rod with an adjustable length.
[0022] In a further technical solution, 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, 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.
[0023] In a further technical solution, the instrument support rod has at least two vertically arranged mounting through holes along the horizontal direction;
[0024] 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.
[0025] A further technical solution is as follows: 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.
[0026] When the instrument is unlocked, the measuring instrument can slide horizontally within the mounting slot;
[0027] When the instrument is locked, the measuring instrument is fixed in the mounting slot;
[0028] The measuring instrument switches between an unlocked state and a locked state to form at least two measuring points.
[0029] In a further technical solution, the preform wall thickness difference measuring instrument also includes a base, and the fixing block is vertically mounted on the base.
[0030] 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, the preform opening support fixture can be slid directly, allowing the preform opening to slide up and down with the preform opening support fixture, thereby achieving 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 has at least two measuring points to obtain the preform wall thickness values at two positions in the horizontal direction, which can directly determine whether the bottle preform is in a horizontal state when mounted on the preform support fixture, and 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
[0031] Figure 1This is a schematic diagram of the structure of a preform wall thickness difference measuring instrument in Example 1;
[0032] Figure 2 This is a schematic diagram of the internal structure of a preform wall thickness difference measuring instrument in Example 1;
[0033] Figure 3 This is a schematic diagram of the internal structure of the billet support tooling in Example 1;
[0034] Figure 4 This is a schematic diagram of the internal structure of the billet bottom support tooling in Example 1;
[0035] Figure 5 This is a schematic diagram of the internal structure of the fixing block in Embodiment 1;
[0036] Figure 6 This is a schematic diagram illustrating the principle of preform leveling adjustment in Example 1;
[0037] Figure 7 This is a schematic diagram of the internal structure of the preform wall thickness difference measuring instrument in Example 2;
[0038] Figure 8 This is a schematic diagram of the internal structure of the blank bottom support tooling in Example 3. Detailed Implementation
[0039] 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.
[0040] 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.
[0041] 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
[0042] like Figures 1 to 6 As shown, this embodiment discloses a preform wall thickness difference measuring instrument for sliding adjustment of preform level, 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, and 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 connected to the same side of the fixing block 2. The preform support fixture 3 includes a preform mouth support fixture 31 for supporting the preform mouth and a preform bottom support fixture 32 for supporting the preform bottom. The preform mouth support fixture 31 can slide relative to the fixing block 2 in the vertical direction for position adjustment, and the preform bottom support fixture 32 is connected to the fixing block 2, thereby achieving the effect of level adjustment when the preform is fitted onto the preform support fixture 3.
[0043] 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.
[0044] The billet bottom support fixture 32 extends through the billet mouth support fixture 31, and there is a sliding space between the billet bottom support fixture 32 and the billet mouth support fixture 31 for the billet mouth support fixture 31 to slide in the vertical direction. Specifically, 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 end face of the support member body 311 away from the fixed block 2 is a support end face 3113, and the support member protrusion 312 is provided on the support end face 3113. The support end face 3113 is used to support the end face of the bottle billet mouth, and the outer peripheral surface of the support member protrusion 312 is used to support the inner wall of the bottle billet mouth.
[0045] The billet opening support can be adjusted in position relative to the fixed block 2 in the vertical direction. The billet opening support fixture has a billet opening unlocked state and a billet opening locked state.
[0046] When the billet opening is unlocked, the billet opening support can slide vertically on one side of the fixed block 2;
[0047] When the billet opening is locked, the billet opening support is fixed to one side of the fixing block 2.
[0048] Specifically, the end face of the support body 311 near the fixed block 2 is a sliding end face 3114, and a support slider 3111 is provided on the sliding end face 3114. A fixed block groove 21 adapted to the support slider 3111 is provided on one side of the fixed block 2 in the vertical direction. In the unlocked state of the billet opening, the billet opening support slides in the vertical direction on one side of the fixed block 2 based on the cooperation between the support slider 3111 and the fixed block groove 21. In the locked state of the billet opening, the support slider 3111 is fixed in the fixed block groove 21, thereby fixing the billet opening support to one side of the fixed block 2.
[0049] Specifically, the support slider 3111 has a slider connecting hole 3112 extending inward from its left side. The left side of the fixing block 2 is provided with a first fixing block mounting position 22. The right side of the first fixing block mounting position 22 is provided with a fixing block strip connecting hole 23 communicating with the fixing block slide groove 21 in the vertical direction. The connector is provided in the first fixing block mounting position 22 and cooperates with the fixing block strip connecting hole 23 and the slider connecting hole 3112 respectively, thereby fixing the blank support fixture 31 to the right side of the fixing block 2.
[0050] Preferably, there are two support sliders 3111, which are respectively located at the upper and lower positions of the first through hole 313; the fixing block groove 21, the first fixing block mounting position 22 and the fixing block strip connecting hole 23 are provided corresponding to the support sliders 3111.
[0051] Preferably, the area inside the fixed block groove 21 or the right side of the fixed block 2 corresponding to the fixed block groove 21 is provided with a sliding scale for indicating the sliding distance of the support slider 3111. The measuring personnel can quickly and accurately adjust the sliding distance of the blank support fixture 31 through the sliding scale.
[0052] Specifically, the billet bottom support fixture 32 includes a horizontally arranged billet bottom support rod 321, and a billet opening support member has a first through hole 313 extending along the horizontal axis. One end of the billet bottom support rod 321 is detachably connected to the fixing block 2, and the middle part of the billet bottom support rod 321 extends through the first through hole 313. There is a sliding space between the billet bottom support rod 321 and the first through hole 313 for the billet opening support member to slide in the vertical direction.
[0053] The other end of the blank bottom support rod 321 extends away from the fixed block 2, and a blank bottom support member 322 is provided vertically. The support head of the blank bottom support member 322 protrudes above the blank bottom support rod 321 to support the inner wall of the bottom of the bottle blank. The vertical dimension of the first through hole 313 is larger than the outer diameter of the portion of the blank bottom support rod 321 corresponding to the first through hole 313, so that there is a certain sliding space between the blank opening support fixture 31 and the blank bottom support rod 321 in the vertical direction. The levelness of the bottle blank is adjusted by sliding the blank opening support member vertically.
[0054] 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 one side of the fixing block 2, and the other end extends horizontally 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 vertically, and the probe of the measuring instrument 42 faces the preform support fixture 3.
[0055] The instrument mounting position 411 on the instrument support rod 41 can be configured in the following two ways:
[0056] 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.
[0057] 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.
[0058] 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.
[0059] Among them, the measuring instrument 42 can be a dial indicator, a micrometer, etc.
[0060] The specific adjustment method is as follows: Place the preform onto the preform support fixture 3. Measure the wall thickness of the preform at two horizontal positions using the measuring instrument 42. Subtract the wall thickness values at the two positions to obtain the wall thickness difference value d. The horizontal distance between the two positions is x. The horizontal distance between the top of the support end face 3113 and the top of the preform bottom support 322 is y. The height of the preform opening support fixture 31 required to level the preform is h. According to the relationship... It can be seen that the height of the preform support fixture 31 required to make the preform horizontal is adjusted. The direction of sliding adjustment of the preform support fixture 31 is determined according to the tilt direction of the preform.
[0061] Specifically, in the connection structure between the fixing block 2 and the billet bottom support rod 321: the right side of the fixing block 2 is provided with a fixing block mounting hole 24 that is adapted to the billet bottom support rod 321; the billet bottom support rod 321 has a support rod connecting hole 3211 extending inward from its left side; the left side of the fixing block 2 is provided with a second fixing block mounting position 25; the right side of the second fixing block mounting position 25 is provided with a first fixing block connecting hole 26 that communicates with the fixing block mounting hole 24; one end of the billet bottom support rod 321 is installed in the fixing block mounting hole 24; the connector is provided in the second fixing block mounting position 25 and cooperates with the first fixing block connecting hole 26 and the support rod connecting hole 3211 respectively, thereby detachably connecting one end of the billet bottom support rod 321 to the fixing block 2.
[0062] 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
[0063] The specific implementation content of this embodiment is largely the same as that of Embodiment 1, the difference being in the specific connection structure between the fixing block 2 and the blank bottom support rod 321: as follows Figure 7 As shown, the billet bottom support rod 321 has a billet bottom unlocked state and a billet bottom locked state: in the billet bottom unlocked state, one end of the billet bottom support rod 321 can slide horizontally within the fixed block 2; in the billet bottom locked state, one end of the billet bottom support rod 321 is fixed within the fixed block 2.
[0064] Specifically, the fixing block 2 has a fixing block sliding hole 27 that passes through along the horizontal axis and is adapted to the blank bottom support rod 321. The blank bottom support rod 321 is provided with a support rod strip-shaped connecting hole 3212 that extends horizontally and passes through the blank bottom support rod 321. The fixing block 2 has a second fixing block connecting hole 28 that extends inward from its front side and communicates with the fixing block sliding hole 27. One end of the blank bottom support rod 321 can slide horizontally in the fixing block sliding hole 27 to adjust the length of the blank bottom support rod 321 extending out of the fixing block 2, so that the length of the blank bottom support rod 321 extending out of the fixing block 2 is adapted to the length of the bottle blank, which can be used for measuring bottle blanks of different lengths. After adjustment, based on the cooperation between the connector and the second fixing block connecting hole 28 and the support rod strip-shaped connecting hole 3212, one end of the blank bottom support rod 321 is detachably connected to the fixing block 2. Example 3
[0065] 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 8 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.
[0066] 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 bottle preform wall thickness difference measuring instrument for sliding adjustment of preform level, characterized in that: It includes a vertically arranged fixing block, and 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 preform mouth and a preform bottom support fixture for supporting the preform bottom. The preform mouth support fixture can slide vertically relative to the fixed block for position adjustment, and the preform bottom support fixture is connected to the fixed block. 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 preform wall thickness difference measuring instrument for sliding adjustment of preform levelness according to claim 1, characterized in that: The billet bottom support fixture extends through the billet opening support fixture, and there is a sliding space between the billet bottom support fixture and the billet opening support fixture for the billet opening support fixture to slide in the vertical direction.
3. The preform wall thickness difference measuring instrument for sliding adjustment of preform levelness according to claim 2, 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 end face of the support body away from the fixed 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 billet opening unlocked state and a billet opening locked state: in the billet opening unlocked state, the billet opening support can slide vertically on one side of the fixed block; in the billet opening locked state, the billet opening support is fixed to one side of the fixed block.
4. The preform wall thickness difference measuring instrument for sliding adjustment of preform levelness according to claim 3, characterized in that: The end face of the main body of the support member near the fixed block is a sliding end face, and a support member slider is provided on the sliding end face; a fixed block groove adapted to the support member slider is provided on one side of the fixed block in the vertical direction. In the unlocked state of the billet opening, the billet opening support slides vertically on one side of the fixed block based on the cooperation between the support slider and the fixed block groove; When the billet opening is locked, the support slider is fixed in the groove of the fixing block, thereby fixing the billet opening support to one side of the fixing block.
5. The preform wall thickness difference measuring instrument for sliding adjustment of preform levelness according to claim 3, characterized in that: The billet bottom support fixture includes a horizontally arranged billet bottom support rod; The billet bottom support rod has a billet bottom unlocked state and a billet bottom locked state: in the billet bottom unlocked state, one end of the billet bottom support rod can slide horizontally within the fixed block; in the billet bottom locked state, one end of the billet bottom support rod is fixed within the fixed block. The billet opening support 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 sliding space between the billet bottom support rod and the first through hole for the billet opening support to slide in the vertical direction. 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.
6. The preform wall thickness difference measuring instrument for sliding adjustment of preform levelness according to claim 5, characterized in that: The blank bottom support rod is an adjustable telescopic rod.
7. The preform wall thickness difference measuring instrument for sliding adjustment of preform level 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.
8. The preform wall thickness difference measuring instrument for sliding adjustment of preform level according to claim 7, 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.
9. A preform wall thickness difference measuring instrument for sliding adjustment of preform levelness according to claim 7, 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.
10. A preform wall thickness difference measuring instrument for sliding adjustment of preform levelness according to claim 1, characterized in that: The preform wall thickness difference measuring instrument also includes a base, and the fixing block is vertically mounted on the base.