A precision detection device for a PET bottle preform mold

Abstract

The utility model discloses a kind of precision detection devices of PET bottle embryo mould, including base, the upper surface of the base is equipped with mould body, the upper surface of the base is located the both sides of mould body and is connected with the installation frame of K type, the top center position of the installation frame of K type is equipped with retractable end downwards hydraulic rod, the retractable end of the hydraulic rod is connected with connecting plate, the lower of the connecting plate is equipped with pressure detection mechanism, the utility model aims at accurately detecting the edge flatness of mould body, pressure sensing element can read the pressure value received by each abutting head in real time, to judge the flatness of mould edge, evaluate the precision degree of mould, to improve the production quality of PET bottle embryo.

Description

Technical Field

[0001] This utility model relates to the field of preform mold testing technology, specifically a precision testing device for PET preform molds. Background Technology

[0002] Quality control of PET preform molds is crucial to ensuring the quality of the final product. The mold's precision, surface finish, material selection, and heat treatment processes all affect its lifespan and the quality of the manufactured PET preforms. Therefore, rigorous quality control and inspection are necessary during mold manufacturing to ensure the mold's precision and stability. However, unevenness at the mold edges during mold closing can trigger a series of problems. Traditional inspection methods, primarily relying on manual visual inspection, have the following significant drawbacks:

[0003] Low testing efficiency: Manual point-by-point inspection is time-consuming and labor-intensive, and cannot meet the high-efficiency testing needs of modern production lines;

[0004] High error rate: Subjective judgment is easily affected by the operator's experience, eyesight and ambient light, leading to frequent missed detections and misjudgments. According to industry data, the defective product outflow rate of traditional manual inspection is relatively high.

[0005] Lack of quantitative capabilities: It is impossible to obtain data on the pressure distribution at the edge of the mold, and it is only possible to qualitatively judge the flatness. It is difficult to accurately assess the precision of the mold and locate the defect.

[0006] To improve testing accuracy, some companies have adopted advanced equipment such as laser scanners and coordinate measuring machines, but these devices have significant limitations:

[0007] High cost: The purchase cost of a single unit exceeds 500,000 yuan, and the annual maintenance cost is about 100,000 yuan, which is difficult for small and medium-sized enterprises to afford;

[0008] Complex operation: It requires professional programmers to operate and debugging is time-consuming (each test takes more than 30 minutes on average), making it difficult to adapt to the production rhythm of rapid mold change;

[0009] Environmentally sensitive: It has stringent requirements for light and vibration in the testing environment, and the actual production line environment is difficult to stably meet the standards, resulting in large fluctuations in test results.

[0010] Prior art document 1 (CN217073320U) discloses an exhaust gas filtration device for PET preform molds, which treats blow molding odors through an activated carbon filter plate, but does not involve mold detection functions; prior art document 2 (CN116852656A) discloses a PET preform mold including a moving component and an exhaust gas collection shell, focusing on mold cooling and exhaust gas treatment, and similarly does not provide any detection methods. In the prior art, there is a lack of a PET preform mold edge flatness detection device that combines high precision, low cost, and ease of operation. Therefore, the invention of a precision detection device for PET preform molds to solve the above problems is urgently needed in the market. Utility Model Content

[0011] The purpose of this invention is to provide a precision detection device for PET preform molds to address the aforementioned problems. This invention aims to accurately detect the edge flatness of the mold body, and the pressure sensing element can read the pressure value of each abutment in real time, thereby judging the flatness of the mold edge, evaluating the precision of the mold, and thus improving the production quality of PET preforms.

[0012] The technical solution of this utility model is as follows:

[0013] This utility model discloses a precision testing device for a PET preform mold, comprising a base, a mold body on the upper surface of the base, and U-shaped mounting brackets connected to both sides of the mold body on the upper surface of the base. A hydraulic rod with a downward-pointing telescopic end is installed at the top center of the U-shaped mounting bracket, and a connecting plate is connected to the telescopic end of the hydraulic rod. A pressure detection mechanism is provided below the connecting plate, and the pressure detection mechanism includes a mounting plate. Several mounting cavities are fixedly installed on the upper surface of the mounting plate. Through holes are opened at the upper and lower ends of the mounting cavities, and sliding columns are slidably connected in the through holes. Through-holes are installed at both ends of the sliding columns. The connecting plate has abutment extending above the mounting cavity and below the mounting plate. Several pressure sensing elements that abut against the abutment are installed on the lower surface of the connecting plate. A spring is sleeved on the outer arc wall of the sliding column inside the mounting cavity. The base is provided with a clamping and fixing mechanism, which includes a placement groove opened on the upper surface of the base. A bidirectional lead screw is rotatably connected to the inner wall of the placement groove. The two ends of the bidirectional lead screw are threaded to sliders that match the longitudinal section of the placement groove. Clamping plates are fixedly installed on both sides of the mold body above the sliders. One end of the bidirectional lead screw extends to the outside of the base and is equipped with a hand crank.

[0014] The base and U-shaped mounting structure form the basic framework of the device, supporting the hydraulic drive system and the detection mechanism, ensuring the overall structural stability. The hydraulic rod and connecting plate realize the vertical lifting and lowering movement of the pressure detection mechanism through hydraulic drive, controlling the precise adjustment of the detection contact force. The pressure detection mechanism includes a mounting cavity, a sliding column, a spring, an abutment, and a pressure sensing element. The sliding column slides in the mounting cavity, converting the pressure at the mold edge into linear displacement. The spring provides elastic buffering to avoid damage to the detection element from rigid impact. The abutment directly contacts the mold surface, transmitting pressure signals. The pressure sensing element abuts against the abutment, converting mechanical pressure into electrical signals for quantitative detection. The clamping and fixing mechanism includes a two-way lead screw, a slider, a clamping plate, and a hand crank. The two-way lead screw drives the slider to move in opposite directions through threaded transmission. The clamping plate directly clamps the mold body, ensuring the mold position is fixed during the detection process. The hand crank provides a manual operation interface for convenient adjustment of the clamping force.

[0015] Furthermore, a limiting block matching the cross-section of the mounting cavity is fitted at the bottom of the outer arc wall of the sliding column located in the mounting cavity. The top end of the spring is fixedly connected to the inner wall of the mounting cavity, and the bottom end of the spring is fixedly connected to the limiting block. The fixed connection between the limiting block and the spring can prevent the spring from being over-compressed or displaced, ensuring the stability of the sliding trajectory of the sliding column and improving the accuracy of detection repeatability.

[0016] Furthermore, connecting posts are fixedly installed at the four corners of the upper surface of the mounting plate. Through grooves matching the cross-section of the connecting posts are opened at the four corners of the upper surface of the connecting plate. A knob is provided above the through groove. A circular groove matching the cross-section of the connecting post is opened at the bottom of the knob. A threaded post is installed on the lower surface of the circular groove. A threaded groove matching the threaded post is opened on the upper surface of the connecting post. The threaded connection between the connecting post and the knob realizes the detachable connection between the mounting plate and the connecting plate, which facilitates the maintenance, calibration and replacement of the testing mechanism and adapts to the needs of different testing scenarios.

[0017] Furthermore, a pulley is installed at the bottom of the slider to abut against the bottom of the placement groove. The pulley abuts against the bottom of the placement groove, converting the sliding friction between the slider and the bottom of the groove into rolling friction, reducing driving resistance, and improving the smoothness of operation and service life of the clamping mechanism.

[0018] Furthermore, gaskets are installed on opposite sides of the two clamping plates to buffer the clamping pressure with flexible materials, avoid hard contact that could scratch the mold surface, and enhance clamping friction to prevent the mold from sliding during the testing process.

[0019] In addition, the surface of the hand crank is provided with anti-slip texture to increase the friction of the operator's hand, prevent slippage and resulting errors in clamping force control, and improve operational safety and accuracy.

[0020] Furthermore, the number of mounting cavities is four, arranged in a matrix on the upper surface of the mounting plate. Through multi-point distributed pressure detection, key areas of the mold edge are covered, improving the comprehensiveness of flatness detection and the ability to identify local defects.

[0021] Furthermore, the end of the bidirectional lead screw located on the outside of the base is rotatably connected to the base via a bearing, and the hand crank is fixedly connected to the end of the bidirectional lead screw to ensure that there is no axial offset when the lead screw rotates, reduce transmission backlash, and improve the synchronicity of the clamping plate movement and positioning accuracy.

[0022] Furthermore, the slider and the clamping plate are fixedly connected by bolts. The clamping plate has an L-shaped structure, and its vertical part abuts against the side of the mold body. The L-shaped structure increases the clamping contact area and improves clamping stability. The bolt fixing ensures that the clamping plate and the slider are rigidly connected, avoiding structural loosening during the testing process.

[0023] Furthermore, the pressure sensing element is connected to an external controller via a wire. The external controller is used to receive and process the pressure data transmitted by the pressure sensing element, realize the real-time transmission and digital processing of the pressure signal, analyze the pressure distribution data through the controller, generate a mold flatness inspection report, and support the automated inspection process.

[0024] In summary, due to the adoption of the above technical solution, the beneficial effects of this utility model are:

[0025] 1. This utility model, through the set pressure detection mechanism, can accurately detect the edge flatness of the mold body. The pressure sensing element can read the pressure value of each abutment in real time, thereby judging the flatness of the mold edge and evaluating the precision of the mold. This high-precision detection method helps to improve the production quality of PET preforms and has low maintenance costs.

[0026] 2. The design of the clamping and fixing mechanism in this utility model enables the detection device to flexibly adapt to mold bodies of different sizes and shapes. By rotating the hand crank, the position of the clamping plate can be easily adjusted to achieve a stable clamping of the mold, thereby ensuring the smooth progress of the detection process. The use of pulleys reduces the frictional resistance of the slider during movement, extends its service life, and ensures the stability of the movement process. The design of springs and limit blocks also enhances the durability and stability of the detection mechanism, enabling the device to maintain high precision and reliability during long-term use. Attached Figure Description

[0027] Figure 1 A schematic diagram of the main structure of a precision testing device for a PET preform mold;

[0028] Figure 2This is a schematic diagram of the connecting plate and mounting plate in a precision testing device for a PET preform mold.

[0029] Figure 3 for Figure 1 Enlarged structural diagram at point A;

[0030] Figure 4 This is a schematic diagram of the structure above the base in a precision testing device for PET preform molds;

[0031] Figure 5 This is a schematic diagram of the knob and connecting column in a precision testing device for a PET preform mold.

[0032] Figure 6 This is a system block diagram of a precision inspection device for PET preform molds.

[0033] Reference numerals: 1-Base; 2-Mold body; 3-U-shaped mounting bracket; 4-Hydraulic rod; 5-Connecting plate; 6-Mounting plate; 7-Connecting column; 8-Pressure sensing element; 9-Mounting cavity; 10-Sliding column; 11-Spring; 12-Limiting block; 13-Placement groove; 14-Two-way lead screw; 15-Clamping plate; 16-Pulley; 17-Hand crank; 18-Abutment joint; 19-Slider; 20-Knob. Detailed Implementation

[0034] It should be noted that relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0035] The features and performance of this utility model will be further described in detail below with reference to the embodiments.

[0036] Please see Figure 1-6 This utility model provides a technical solution:

[0037] See Figure 2 , Figure 3 and Figure 6As shown, a precision testing device for a PET preform mold includes a base 1, a mold body 2 on the upper surface of the base 1, and U-shaped mounting brackets 3 connected to both sides of the upper surface of the base 1 on the mold body 2. A hydraulic rod 4 with its telescopic end pointing downwards is installed at the top center of the U-shaped mounting bracket 3. A connecting plate 5 is connected to the telescopic end of the hydraulic rod 4. A pressure testing mechanism is provided below the connecting plate 5. The pressure testing mechanism includes a mounting plate 6, and several mounting cavities 9 are fixedly installed on the upper surface of the mounting plate 6. Through holes are opened at the upper and lower ends of the mounting cavities 9. A sliding column 10 is slidably connected inside the through hole. Both ends of the sliding column 10 are fitted with abutment joints 18 that extend through to the top of the mounting cavity 9 and the bottom of the mounting plate 6. Several pressure sensing elements 8 that abut against the abutment joints 18 are installed on the lower surface of the connecting plate 5. A spring 11 is sleeved on the outer arc wall of the sliding column 10 inside the mounting cavity 9. A limiting block 12 that matches the cross-section of the mounting cavity 9 is sleeved on the bottom of the outer arc wall of the sliding column 10 inside the mounting cavity 9. The top end of the spring 11 is fixedly connected to the mounting cavity 9, and the other end is fixedly connected to the limiting block 12.

[0038] In the specific implementation process, when it is necessary to check the edge flatness of the mold body 2, the hydraulic rod 4 is first activated. The telescopic end of the hydraulic rod 4 moves downward, driving the connecting plate 5 and the pressure detection mechanism below it to approach the mold body 2. As the connecting plate 5 descends, the abutment 18 first contacts the edge of the mold body 2. As the hydraulic rod 4 continues to press down, the slide column 10 slides in the mounting cavity 9. If there is unevenness at the edge of the mold body 2, the abutment 18 connected to the slide column 10 will be subjected to different degrees of pressure, and the pressure will be transmitted to the spring 11 through the slide column 10. The degree of compression of the spring 11 reflects the flatness of the mold edge. If the mold edge is flat, all the abutments 18 will be subjected to pressure. The compression degree of spring 11 is uniform; if the edge of the mold is uneven, the compression degree of spring 11 at different positions will be different. The pressure sensing element 8 installed on the lower surface of the connecting plate 5 can read the pressure value of each abutment 18 in real time to determine whether the edge of the mold body 2 is flat and to determine the pressure distribution on the surface of the mold body 2, thereby assessing the precision of the mold body 2. After the test is completed, the hydraulic rod 4 is closed, causing its telescopic end to retract, which drives the connecting plate 5, the mounting plate 6 and the pressure detection mechanism to rise as a whole and move away from the mold body 2. At this time, spring 11 will rebound and wait for the next round of testing. When the pressure sensing element 8 is damaged, it can be repaired and replaced at any time.

[0039] See Figure 1 and Figure 4As shown, the base 1 is provided with a clamping and fixing mechanism, which includes a placement groove 13 opened on the upper surface of the base 1. A bidirectional lead screw 14 is rotatably connected to the inner wall of the placement groove 13. The two ends of the bidirectional lead screw 14 are threadedly connected to sliders 19 that match the longitudinal section of the placement groove 13. Clamping plates 15 are fixedly installed on both sides of the mold body 2 above the sliders 19. One end of the bidirectional lead screw 14 extends through to the outside of the base 1. A hand crank 17 is installed at the end of the bidirectional lead screw 14 located on the outside of the base 1. In the specific implementation process, when it is necessary to inspect the mold body 2, the mold body 2 is placed on the upper surface of the base 1, and the hand crank 17 is rotated. The hand crank 17 will drive the bidirectional lead screw 14 to rotate in the inner wall of the placement groove 13. Since the two ends of the bidirectional lead screw 14 are threaded with sliders 19 that match the longitudinal section of the placement groove 13, when the bidirectional lead screw 14 rotates, the two sliders 19 will move towards each other or in opposite directions along the longitudinal section of the placement groove 13. As the sliders 19 move, the clamping plates 15 above them will also move closer to the mold body 2 accordingly to clamp and fix the mold body 2.

[0040] See Figure 1 and Figure 4 As shown, a pulley 16 is installed at the bottom of the slider 19, which abuts against the bottom of the placement groove 13. Pads are installed on opposite sides of the two clamping plates 15, and the hand crank 17 has anti-slip textures. In practical implementation, the pulley 16 reduces the frictional resistance of the slider 19 during movement, allowing the clamping plates 15 to move closer to or further away from the mold body 2 more smoothly and quickly. The use of the pulley 16 also extends the service life of the slider 19 and the placement groove 13. Simultaneously, the pulley 16 ensures the stability of the slider 19 during movement, avoiding inaccurate clamping due to shaking or deviation. The pads installed on the clamping plates 15 increase the contact area between the clamping plates 15 and the mold body 2, thereby dispersing the clamping force and preventing damage to the mold body 2 due to excessive local pressure. The anti-slip textures on the hand crank 17 increase the friction when the operator rotates the hand crank 17, thus preventing operational errors caused by slippage.

[0041] See Figure 5As shown, connecting posts 7 are fixedly installed at the four corners of the upper surface of the mounting plate 6. Through slots matching the cross-section of the connecting posts 7 are formed at the four corners of the upper surface of the connecting plate 5. A knob 20 is located above the through slots. A circular groove matching the cross-section of the connecting posts 7 is formed at the bottom of the knob 20. A threaded post is installed on the lower surface of the circular groove, and a threaded groove matching the threaded post is formed on the upper surface of the connecting post 7. In practice, when it is necessary to fix the connecting plate 5 to the mounting plate 6, the through slots on the connecting plate 5 can be aligned with the connecting posts 7 on the mounting plate 6 and then screwed in from above, so that the threaded post at its bottom is threadedly connected to the threaded groove on the upper surface of the connecting post 7. As the knob 20 rotates, the threaded post gradually penetrates into the threaded groove, thus tightly fixing the connecting plate 5 to the mounting plate 6. Conversely, the mounting plate 6 can be disassembled for easy maintenance and replacement.

[0042] Working principle:

[0043] Step 1: Place the mold body 2 on the upper surface of the base 1 and rotate the hand crank 17. The hand crank 17 drives the double-acting screw 14 to rotate in the inner wall of the placement groove 13. Since the two ends of the double-acting screw 14 are threaded with sliders 19 that match the longitudinal section of the placement groove 13, the rotation of the double-acting screw 14 will cause the two sliders 19 to move towards each other along the longitudinal section of the placement groove 13. As the sliders 19 move, the clamping plates 15 above them will also move closer to the mold body 2 until the clamping plates 15 are in close contact with the two sides of the mold body 2, thereby firmly fixing the mold body 2 in the placement groove 13. The pulleys 16 at the bottom of the sliders 19 reduce the frictional resistance during the movement, ensuring the smooth movement and stability of the sliders 19.

[0044] Step 2: Activate hydraulic rod 4. The telescopic end of hydraulic rod 4 moves downward, driving the connecting plate 5 and the pressure detection mechanism below it closer to the mold body 2. As the connecting plate 5 descends, the abutment 18 first contacts the edge of the mold body 2. Continue to press down hydraulic rod 4, and the sliding column 10 slides in the mounting cavity 9. If the edge of the mold body 2 is flat, the pressure on all abutments 18 is uniform, and the compression degree of spring 11 is consistent. If the edge of the mold is not flat, the compression degree of spring 11 at different positions will be different. The pressure sensing element 8 installed on the lower surface of the connecting plate 5 can read the pressure value of each abutment 18 in real time and transmit this data to the control system. The control system judges whether the edge of the mold body 2 is flat and the pressure distribution on the surface of the mold body 2 based on the read pressure value, thereby evaluating the precision of the mold body 2. After the test is completed, close hydraulic rod 4, causing its telescopic end to retract, driving the connecting plate 5, mounting plate 6 and pressure detection mechanism to rise as a whole and move away from the mold body 2. At this time, spring 11 will rebound to its initial state, waiting for the next round of testing.

[0045] The embodiments described above merely illustrate specific implementation methods of this application, and while the descriptions are detailed and specific, they should not be construed as limiting the scope of protection of this application. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the technical solution of this application, and these modifications and improvements all fall within the scope of protection of this application.

Claims

1. A precision inspection device for PET preform molds, characterized in that, The system includes a base (1), on the upper surface of which a mold body (2) is provided. A U-shaped mounting bracket (3) is connected to both sides of the upper surface of the base (1) on the mold body (2). A hydraulic rod (4) with its telescopic end pointing downwards is installed at the top center of the U-shaped mounting bracket (3). A connecting plate (5) is connected to the telescopic end of the hydraulic rod (4). A pressure detection mechanism is provided below the connecting plate (5). The pressure detection mechanism includes a mounting plate (6). Several mounting cavities (9) are fixedly installed on the upper surface of the mounting plate (6). Through holes are opened at the upper and lower ends of the mounting cavities (9). Sliding columns (10) are slidably connected within the through holes. Abutment joints are installed at both ends of the sliding columns (10), extending through to the top of the mounting cavity (9) and the bottom of the mounting plate (6). (18), the lower surface of the connecting plate (5) is equipped with several pressure sensing elements (8) that abut against the abutment (18), and the sliding column (10) is fitted with a spring (11) on the outer arc wall inside the mounting cavity (9); the base (1) is provided with a clamping and fixing mechanism, the clamping and fixing mechanism includes a placement groove (13) opened on the upper surface of the base (1), the inner wall of the placement groove (13) is rotatably connected with a two-way screw (14), the two ends of the two-way screw (14) are threadedly connected with sliders (19) that match the longitudinal section of the placement groove (13), the sliders (19) are fixedly installed on both sides of the mold body (2) above the mold body (2), and one end of the two-way screw (14) extends through to the outside of the base (1) and is equipped with a hand crank (17).

2. The precision detection device for PET preform molds according to claim 1, characterized in that, The sliding column (10) is fitted with a limiting block (12) that matches the cross-section of the mounting cavity (9) at the bottom of the outer arc wall. The top end of the spring (11) is fixedly connected to the inner wall of the mounting cavity (9), and the bottom end of the spring (11) is fixedly connected to the limiting block (12).

3. The precision detection device for PET preform molds according to claim 1, characterized in that, Connecting posts (7) are fixedly installed at the four corners of the upper surface of the mounting plate (6). The four corners of the upper surface of the connecting plate (5) are provided with through grooves that match the cross-section of the connecting post (7). A knob (20) is provided above the through groove. A circular groove that matches the cross-section of the connecting post (7) is provided at the bottom of the knob (20). A threaded post is installed on the lower surface of the circular groove. A threaded groove that matches the threaded post is provided on the upper surface of the connecting post (7).

4. The precision detection device for PET preform molds according to claim 1, characterized in that, The bottom of the slider (19) is fitted with a pulley (16) that abuts against the bottom of the placement groove (13).

5. The precision detection device for PET preform molds according to claim 1, characterized in that, Gaskets are installed on opposite sides of the two clamping plates (15).

6. The precision detection device for PET preform molds according to claim 1, characterized in that, The hand crank (17) has anti-slip texture on its surface.

7. The precision detection device for PET preform molds according to claim 1, characterized in that, The number of mounting cavities (9) is four, arranged in a matrix on the upper surface of the mounting plate (6).

8. The precision detection device for PET preform molds according to claim 1, characterized in that, The end of the bidirectional lead screw (14) located outside the base (1) is rotatably connected to the base (1) via a bearing, and the hand crank (17) is fixedly connected to the end of the bidirectional lead screw (14).

9. The precision detection device for PET preform molds according to claim 1, characterized in that, The slider (19) and the clamping plate (15) are fixedly connected by bolts. The clamping plate (15) has an L-shaped structure, and its vertical part abuts against the side of the mold body (2).

10. The precision detection device for PET preform molds according to claim 1, characterized in that, The pressure sensing element (8) is connected to an external controller via a wire. The external controller is used to receive and process the pressure data transmitted by the pressure sensing element (8).

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