Positioning tool and mold clamping force monitoring device and system

Abstract

The utility model discloses a positioning tool and a mold clamping force monitoring device and system, and relates to the technical field of plastic injection molding equipment. The positioning tool comprises a sliding seat used for being in sliding fit with a tiebar; the horizontal measuring mechanism is arranged on the sliding seat and is used for detecting the relative relation between the reference surface of the sliding seat and the horizontal plane; and the distance measuring mechanism is arranged on the sliding seat and is used for detecting the distance between the sliding seat and a reference target. Through the positioning tool, the target to-be-detected point can be quickly and accurately determined on each tiebar, and quick and accurate positioning of the target to-be-detected point is realized.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of plastic injection molding equipment, in particular to a positioning tool, a clamping force monitoring device and system. BACKGROUND

[0002] The Gelin column refers to a rod-shaped component installed on a molding equipment such as an injection molding machine or a die casting machine, which mainly plays a role in balancing the sliding of the mold plate and bearing the tension caused by the clamping. In the clamping module, the performance and role of the Gelin column directly affect the product quality, so accurate clamping force detection is needed.

[0003] However, the current method for determining the detection point is often obtained by measuring with a micrometer, which is time-consuming and difficult to ensure accuracy. Practical new type content

[0004] The main purpose of the present application is to provide a positioning tool, a clamping force monitoring device and system, which aims to solve the problem of tedious and time-consuming positioning process of the detection point and difficult to ensure accuracy.

[0005] To achieve the above purpose, in a first aspect, the present application provides a positioning tool, which comprises:

[0006] a sliding seat for slidingly fitting with the Gelin column;

[0007] a horizontal measurement mechanism arranged on the sliding seat for detecting the relative relationship between the reference surface of the sliding seat and the horizontal plane;

[0008] a distance measuring mechanism arranged on the sliding seat for detecting the distance between the sliding seat and the reference target.

[0009] In an embodiment, the sliding seat comprises opposite first and second surfaces, the first surface is provided with a sliding groove adapted to the outer peripheral surface of the Gelin column, and the horizontal measurement mechanism and the distance measuring mechanism are arranged on the second surface respectively.

[0010] In an embodiment, the second surface is provided with a first groove extending in a first direction and a second groove extending in a second direction, the first groove is used for mounting the distance measuring mechanism, and the second groove is used for mounting the horizontal measurement mechanism, wherein the first direction intersects the second direction.

[0011] In an embodiment, the positioning tool further comprises a limiting piece, which is detachably connected to the second surface and used for limiting the distance measuring mechanism in the first groove.

[0012] In an embodiment, the positioning tool further comprises a first fixing bolt and a second fixing bolt, the sliding base is respectively provided with a first screw hole and a second screw hole, the first screw hole is communicated with the first groove, and the second screw hole is communicated with the second groove;

[0013] The first fixing bolt is threadedly connected with the first screw hole and applies pressure to the distance measuring mechanism, so that the distance measuring mechanism is fixed in the first groove;

[0014] The second fixing bolt is threadedly connected with the second screw hole and applies pressure to the horizontal measuring mechanism, so that the horizontal measuring mechanism is fixed in the second groove.

[0015] In a second aspect, the application further provides a mold clamping force monitoring device, comprising:

[0016] The positioning tool as described in the first aspect is used for positioning a target to-be-detected point on a to-be-detected corinthian column;

[0017] At least two strain gauges, each of the strain gauges is arranged at a target to-be-detected point of each of the to-be-detected corinthian columns;

[0018] A strain transmitter comprising a Wheatstone bridge circuit and a signal processing circuit, each of the strain gauges is connected to a bridge arm of the Wheatstone bridge circuit, the Wheatstone bridge circuit is used for generating a voltage output signal proportional to a change in strain gauge resistance based on a strain amount of each of the strain gauges, and the signal processing circuit is used for amplifying the voltage output signal and generating mold clamping force data according to the amplified voltage output signal.

[0019] In an embodiment, the mold clamping force monitoring device further comprises a human-computer interaction device, and the human-computer interaction device is in communication connection with the strain transmitter.

[0020] In an embodiment, the mold clamping force monitoring device further comprises an alarm unit, and the alarm unit is in electrical connection with the human-computer interaction device.

[0021] In an embodiment, the mold clamping force monitoring device further comprises a protective cover, the protective cover is provided with a protective groove, the protective cover is adapted to be mounted on an outer peripheral surface of the to-be-detected corinthian column, and the protective groove is used for accommodating the strain gauges.

[0022] In a third aspect, the application further provides a mold clamping force monitoring system, comprising an injection molding machine and the mold clamping force monitoring device as described in the second aspect.

[0023] The positioning tool comprises a sliding seat, a horizontal measurement mechanism and a distance measurement mechanism, the horizontal measurement mechanism and the distance measurement mechanism are arranged on the sliding seat, the sliding seat can drive the horizontal measurement mechanism and the distance measurement mechanism to slide on the outer circumferential surface of the Gelin column quickly, the horizontal measurement mechanism can quickly detect the relative angle between the reference surface of the sliding seat and the horizontal plane, and the distance measurement mechanism can quickly detect the distance between the sliding seat and the reference target, and therefore, the corresponding target detection point, such as the center highest point of the Gelin column, can be quickly and accurately positioned on each Gelin column based on the consistent relative angle and distance, so that the target detection point can be quickly and accurately determined on each Gelin column by using the positioning tool, and the quick and accurate positioning of the target detection point is realized.

[0024] The mold clamping force monitoring device and the mold clamping force monitoring system comprise the positioning tool of the first aspect, at least two strain gauges and a strain transmitter, the corresponding target detection point can be quickly and accurately determined on each Gelin column by using the positioning tool, and after the target detection points are determined, the strain gauges are arranged on the target detection points of the Gelin columns to be detected respectively. Since the strain gauges are connected to the bridge arms of the Wheatstone bridge circuit, when the strain gauges are deformed under the action of the mold clamping force of the injection mold, the Wheatstone bridge circuit of the strain transmitter can generate a voltage output signal proportional to the resistance change of the strain gauges based on the strain of the strain gauges, and the signal processing circuit of the strain transmitter can obtain the mold clamping force information according to the amplified voltage output signal, so that the mold clamping force is measured. By monitoring the mold clamping force, the fracture of the Gelin column caused by uneven stress can be avoided, and the yield and quality of the injection molded part are improved. BRIEF DESCRIPTION OF DRAWINGS

[0025] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the drawings needed in the embodiments or the prior art description will be briefly introduced. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor.

[0026] Figure 1 It is a structural schematic view of the sliding seat in an embodiment of the present application.

[0027] Figure 2 It is a side view schematic view of the positioning tool in an embodiment of the present application.

[0028] Figure 3 It is a front view schematic view of the positioning tool in an embodiment of the present application.

[0029] Figure 4 It is a structural block diagram of the mold clamping force monitoring device in an embodiment of the present application.

[0030] Figure 5Structure block diagram of the mold clamping force monitoring device in another embodiment of the present application;

[0031] Figure 6 Structure block diagram of the mold clamping force monitoring device in another embodiment of the present application;

[0032] Figure 7 Structure diagram of the protective cover in one embodiment of the present application;

[0033] Figure 8 Structure diagram of the protective cover in one embodiment of the present application.

[0034] Brief description of the drawings:

[0035] 11- slide, 111- first surface, 1111- sliding groove, 112- second surface, 1121- first groove, 1122- second groove, 12- horizontal measurement mechanism, 13- distance measurement mechanism, 14- limit screw hole, 15- first screw hole, 16- second screw hole, 2- strain gauge, 3- strain transmitter, 31- Wheatstone bridge circuit, 32- signal processing circuit, 4- human-computer interaction device, 5- alarm unit, 6- protective cover, 61- protective groove, 62- protective shell, 63- magnet mounting groove, 64- wiring hole, 65- transmission line hole, 66- auxiliary groove.

[0036] The implementation, functional features and advantages of the present application will be further described with reference to the embodiments and the accompanying drawings. DETAILED DESCRIPTION

[0037] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work fall within the scope of protection of the present application.

[0038] It should be noted that if the directionality indication (such as up, down, left, right, front, back, etc.) is involved in the embodiments of the present application, the directionality indication is only used to explain the relative position relationship, movement condition, etc. between the components in a certain specific posture, and if the specific posture changes, the directionality indication also changes accordingly.

[0039] Furthermore, if the embodiments of this application involve descriptions such as "first" or "second," these 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 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. If the combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed in this application.

[0040] As described in the background section, tie rods are rod-shaped components installed on molding equipment such as injection molding machines and die casting machines to provide traction. Their main functions include balancing mold plate sliding and bearing the tension caused by mold clamping. In mold clamping components, the performance and function of tie rods directly affect product quality; therefore, accurate clamping force testing is necessary.

[0041] Testing the clamping force requires determining the corresponding test point on multiple tie rods. Currently, the test point is often determined by measuring with a micrometer, which is a complicated and time-consuming process and makes it difficult to guarantee accuracy.

[0042] To address the aforementioned problems, embodiments of this application provide a positioning fixture, such as... Figures 1 to 3 As shown, the positioning fixture includes: a slide 11, a horizontal measuring mechanism 12, and a distance measuring mechanism 13.

[0043] The slide block 11 is designed to slide smoothly onto the outer circumferential surface of the guide post. A horizontal measuring mechanism 12 is mounted on the slide block 11 to detect the relative angle between the reference plane of the slide block 11 and the horizontal plane. A distance measuring mechanism 13 is mounted on the slide block 11 to detect the distance between the slide block 11 and the reference target.

[0044] The slide 11 has a mounting surface and a sliding surface, the mounting surface and the sliding surface are different surfaces, the horizontal measuring mechanism 12 and the distance measuring mechanism 13 can be mounted on the mounting surface of the slide 11, the sliding surface of the slide 11 is suitable for contacting the outer circumferential surface of the Goring column, and on this basis, the slide 11 can slide along the outer circumferential surface of the Goring column, so that the slide 11 can slide to any point on the outer circumferential surface of the Goring column. The horizontal measuring mechanism 12 can be a horizontal angle ruler, which measures the relative angle between the reference surface of the slide 11 and the horizontal plane. The horizontal measuring mechanism 12 can also be a level, such as a bubble level, a laser level or an electronic level, which is used to determine whether the reference surface of the slide 11 is horizontal. The distance measuring mechanism 13 can be a distance meter, such as a laser distance meter, an ultrasonic distance meter or an infrared distance meter. The reference target can be selected according to the needs, for example, a baffle can be arranged at the end of the Goring column.

[0045] It can be understood that when the horizontal measuring mechanism 12 is a horizontal angle ruler, after the relative angle and the measured distance from the reference target are determined, a unique point on the Goring column can be determined. On this basis, during the positioning process, for different Goring columns, the same relative angle and measured distance can be used to quickly determine the corresponding target detection point on each Goring column, thereby achieving rapid positioning of the target detection point. Similarly, when the horizontal measuring mechanism 12 is a level, by limiting the reference surface of the slide 11 to be horizontal and determining the measured distance from the reference target, a unique point on the Goring column can also be determined. Similarly, during the positioning process, by using the same measured distance and limiting the reference surface of the slide 11 to be horizontal, the corresponding target detection point on each Goring column can also be quickly determined, thereby achieving rapid positioning of the detection point.

[0046] For example, the target detection point is defined as the center highest point of the Goring column, and the corresponding measurement condition is that the reference surface of the slide 11 is horizontal and the measured distance is half of the axial length of the Goring column. The use process of the positioning tool is as follows: first, the slide 11 is placed on the Goring column to be detected; then, based on the measurement parameters of the distance measuring mechanism 13 as a reference, the positioning tool is slid to the center position of the Goring column, i.e., the position with a measured distance of half of the axial length of the Goring column. After the positioning tool is slid to the center position of the Goring column, horizontal positioning is performed based on the detection result of the horizontal measuring mechanism 12 until the reference surface of the slide 11 is horizontal. Finally, the target detection point of the Goring column is determined based on the position of the slide 11. It can be found that the positioning tool of the present embodiment is very simple to operate and can be positioned quickly and accurately.

[0047] The positioning tool comprises a sliding base 11, a horizontal measurement mechanism 12 and a distance measurement mechanism 13, the horizontal measurement mechanism 12 and the distance measurement mechanism 13 are arranged on the sliding base 11, and the sliding base 11 can drive the horizontal measurement mechanism 12 and the distance measurement mechanism 13 to slide on the outer circumferential surface of the Goring column. Since the horizontal measurement mechanism 12 can quickly detect the relative angle between the reference surface of the sliding base 11 and the horizontal plane, and the distance measurement mechanism 13 can quickly detect the distance between the sliding base 11 and the reference target, the corresponding target detection point, for example, the center highest point of the Goring column, can be quickly and accurately positioned on each Goring column based on the consistent relative angle and distance. Therefore, the target detection point can be quickly and accurately determined on each Goring column by using the positioning tool, and the quick and accurate positioning of the target detection point is realized.

[0048] In one embodiment, as shown in Figure 1 and Figure 2 The sliding base 11 comprises opposite first and second surfaces 111 and 112, the first surface 111 is provided with a sliding groove 1111 adapted to the outer circumferential surface of the Goring column, and the horizontal measurement mechanism 12 and the distance measurement mechanism 13 are arranged on the second surface 112.

[0049] The sliding base 11 has a cuboid shape, and the first and second surfaces 111 and 112 are parallel. The sliding groove 1111 provided on the first surface 111 can have a circular arc cross-sectional shape, a V-shaped cross-sectional shape or other cross-sectional shapes. For example, the sliding groove 1111 provided on the first surface 111 has a V-shaped cross-sectional shape, so as to adapt to Goring columns of different sizes, thereby eliminating the need to manufacture positioning tools of different specifications for Goring columns of different sizes, and greatly improving the versatility of the positioning tool. The second surface 112 can be provided with corresponding mounting holes or mounting grooves to cooperate with the mounting of the horizontal measurement mechanism 12 and the distance measurement mechanism 13.

[0050] In application, it can be understood that the sliding groove 1111 of the sliding base 11 closely contacts the outer circumferential surface of the Goring column. In order to facilitate operation, the sliding base 11 often needs to slide above the Goring column to be supported by the Goring column. In the case that the sliding groove 1111 adapted to the outer circumferential surface of the Goring column is provided on the first surface 111, and the horizontal measurement mechanism 12 and the distance measurement mechanism 13 are arranged on the second surface 112, since the first and second surfaces 111 and 112 of the sliding base 11 are oppositely arranged, the sliding base 11 is used to support the horizontal measurement mechanism 12 and the distance measurement mechanism 13. By making the sliding base 11 slide above the Goring column, the positioning tool as a whole can be supported by the Goring column, which reduces the operation difficulty of the operator and improves the stability of the sliding of the positioning tool.

[0051] In one embodiment, as shown in Figure 1 andFigure 2 As shown, the second surface 112 is provided with a first groove 1121 extending along a first direction and a second groove 1122 extending along a second direction, the first groove 1121 is used for mounting the distance measuring mechanism 13, and the second groove 1122 is used for mounting the horizontal measuring mechanism 12, wherein the first direction intersects the second direction.

[0052] The first groove 1121 and the second groove 1122 can be communicated. The shape of the first groove 1121 can match the contour of the distance measuring mechanism 13. Exemplarily, the first groove 1121 can be a long and recessed groove with a certain depth and width, so as to stably accommodate the distance measuring instrument, such as a laser range finder or an ultrasonic range finder probe, etc. The second groove 1122 is extended along the second direction, and is used for mounting the horizontal measuring mechanism 12. The second groove 1122 also has a shape matching the horizontal measuring mechanism 12, and can also be a long and recessed groove.

[0053] It should be noted that when the sliding seat 11 slides on the outer circumferential surface of the corinthian column, the first direction is the sliding direction of the corinthian column, i.e. the extension direction of the corinthian column, and the measuring direction of the distance measuring mechanism 13 is also the first direction, so that after the distance measuring mechanism 13 is arranged in the first groove 1121, the distance measuring mechanism 13 can measure the distance of the sliding seat 11 relative to the reference target in the first direction, so as to determine the current position information of the sliding seat 11.

[0054] It can be understood that when the first direction is the sliding direction of the corinthian column, since the second direction intersects the first direction, the user's line of sight will follow the sliding direction of the sliding seat 11, and therefore the horizontal measuring mechanism 12 mounted in the second groove 1122 will partially cover the user's range of view, and the user can view the detection result of the horizontal measuring mechanism 12 in real time, thereby facilitating the user to perform the measuring operation.

[0055] In one embodiment, as shown in Figure 1 and Figure 2 The positioning tool further comprises a limiting member (not shown in the figure) which is detachably connected to the second surface 112 and is used for limiting the distance measuring mechanism 13 in the first groove 1121.

[0056] The limiting member can be an intercepting column or an intercepting plate. The limiting member and the sliding seat 11 can be connected in various ways, for example, the limiting member and the sliding seat 11 can be connected through bolts, and when it is necessary to mount or dismount the limiting member, only the tightening or loosening of the bolts needs to be operated; or the limiting member and the sliding seat 11 can be connected in the form of close fitting of a clamping groove and a clamping block, so as to conveniently and quickly realize the fixation and separation of the limiting member.

[0057] Exemplarily, the second surface 112 is provided with a limiting screw hole 14, and a limiting piece is threadedly connected with the limiting screw hole 14. The installation and dismounting process of the distance measuring mechanism 13 can be as follows: when the distance measuring mechanism 13 needs to be dismounted, the limiting piece needs to be separated from the sliding base 11 before the distance measuring mechanism 13 is installed in the first groove 1121; and after the distance measuring mechanism 13 is installed in the first groove 1121, the limiting piece is fixed on the second surface 112. Similarly, when the distance measuring mechanism 13 needs to be dismounted, the limiting piece can be separated from the sliding base 11, the distance measuring mechanism 13 is taken out, and then the limiting piece is fixed on the second surface 112. By detachably connecting the limiting piece with the sliding base 11, the limiting piece can play a limiting function and will not excessively affect the installation and dismounting of the distance measuring mechanism 13.

[0058] In application, when the limiting piece is connected to the second surface 112, its main function is to limit the distance measuring mechanism 13 located in the first groove 1121. Since the distance measuring mechanism 13 is installed in the first groove 1121, if there is no limiting piece, the distance measuring mechanism 13 may be displaced due to vibration, collision or other external force factors during the working process of the positioning tool, which may lead to inaccurate distance measurement or even damage. By limiting the distance measuring mechanism 13, the movement space of the distance measuring mechanism 13 can be limited, and the distance measuring mechanism 13 can be stably fixed in the first groove 1121. In this embodiment, the distance measuring mechanism 13 can be effectively prevented from being taken out of the first groove 1121 by the limiting piece, so that the distance measuring mechanism 13 is always in the correct working position, thereby continuously and accurately measuring the distance between the sliding base 11 and the reference target, and providing reliable guarantee for the distance measuring process.

[0059] It should be further pointed out that in application, the positioning tool can also include a limiting piece for the horizontal measuring mechanism 12, which is used to limit the horizontal measuring mechanism 12 in the second groove 1122, and the limiting piece can also be detachably connected with the sliding base 11.

[0060] In one embodiment, as shown in Figure 1 and Figure 2 The positioning tool further includes a first fixing bolt (not shown in the figure) and a second fixing bolt (not shown in the figure). The sliding base 11 is provided with a first screw hole 15 and a second screw hole 16, respectively, the first screw hole 15 is in communication with the first groove 1121, and the second screw hole 16 is in communication with the second groove 1122.

[0061] The first fixing bolt is threadedly connected with the first screw hole 15 and presses on the distance measuring mechanism 13, so that the distance measuring mechanism 13 is fixed in the first groove 1121. The second fixing bolt is threadedly connected with the second screw hole 16 and presses on the horizontal measuring mechanism 12, so that the horizontal measuring mechanism 12 is fixed in the second groove 1122.

[0062] It can be understood that the first fixing bolt is screwed with the first threaded hole 15, so that the first fixing bolt is stably connected with the sliding seat 11, and the part of the first fixing bolt penetrating through the first threaded hole 15 presses the distance measuring mechanism 13 to press the distance measuring mechanism 13 on the side wall of the first groove 1121, so as to increase the friction between the distance measuring mechanism 13 and the side wall of the first groove 1121, thereby stably fixing the distance measuring mechanism 13 in the first groove 1121, avoiding the distance measuring mechanism 13 from shaking during the measurement, thereby continuously and accurately measuring the distance between the sliding seat 11 and the reference target, and providing reliable guarantee for the distance measuring process.

[0063] Similarly, the second fixing bolt is screwed with the second threaded hole 16, so that the second fixing bolt is stably connected with the sliding seat 11, and the part of the second fixing bolt penetrating through the second threaded hole 16 presses the horizontal measuring mechanism 12 to press the horizontal measuring mechanism 12 on the side wall of the second groove 1122, so as to increase the friction between the horizontal measuring mechanism 12 and the side wall of the second groove 1122, thereby stably fixing the horizontal measuring mechanism 12 in the second groove 1122, avoiding the horizontal measuring mechanism 12 from shaking during the measurement, thereby accurately detecting the relative relationship between the reference surface of the sliding seat 11 and the horizontal plane.

[0064] As shown in Figure 4 The embodiment of the application further provides a locking force monitoring device, which comprises at least two strain gauges 2, a strain transmitter 3 and the positioning tool according to any one of the preceding embodiments.

[0065] Each of the strain gauges 2 is arranged at a target detection point of each of the corinthian columns.

[0066] The strain transmitter 3 comprises a Wheatstone bridge circuit 31 and a signal processing circuit 32, each of the strain gauges 2 is connected to an arm of the Wheatstone bridge circuit 31, the Wheatstone bridge circuit 31 is used for generating a voltage output signal proportional to the resistance change of the strain gauge 2 based on the strain of each of the strain gauges 2, and the signal processing circuit 32 is used for amplifying the voltage output signal and obtaining the locking force information according to the amplified voltage output signal.

[0067] In the application, taking a plastic film machine as an example, in order to effectively improve the system rigidity and stability of the plastic film machine, it is necessary to detect the locking force of the corinthian column, so that the stress and strain of the four corinthian columns can be exactly known, thereby avoiding the uneven stress distribution to cause the corinthian column to be broken.

[0068] In order to solve the above problems, it is necessary to select corresponding target detection points on a plurality of to-be-detected columns, and to determine whether the stress distribution is uniform according to the stress condition of each target detection point. In the embodiment, the positioning tool of the above embodiment determines the target detection point based on the same limiting parameters (the measurement parameters of the horizontal measurement mechanism 12 and the distance measurement mechanism 13), and can determine the target detection point at the same position of the corresponding column, for example, the center highest point on the column. Thus, the positioning tool can quickly and accurately position the target detection point.

[0069] After positioning the target detection points on each to-be-detected column, each strain gauge 2 is arranged at the target detection point of each to-be-detected column, and each strain gauge 2 is connected to the bridge arm of the Wheatstone bridge circuit 31. The strain gauge 2 will deform under the action of the locking force, and the deformation of the strain gauge 2 will cause the resistance of the strain gauge 2 to change. The Wheatstone bridge circuit 31 can generate a voltage output signal proportional to the resistance change of the strain gauge 2 based on the strain of each strain gauge 2, and then the signal processing circuit 32 receives the voltage output signal and performs amplification processing to obtain the locking force data according to the amplified voltage output signal. The locking force data can be a data signal converted from the voltage output signal, or a data obtained after other processing, for example, the strain (uE) in the complete opening and closing mold process is collected by the strain transmitter 3 at a frequency of 10 Hz, and then the standard locking force data is determined by combining the Young's modulus, the column diameter and other input parameters. After obtaining the locking force data, the strain transmitter 3 can transmit it to the corresponding computer device to finally determine the locking force through the computer device.

[0070] It should be noted that after each strain gauge 2 is connected to the bridge arm of the Wheatstone bridge circuit 31, the Wheatstone bridge circuit 31 formed is a Wheatstone half-bridge circuit or a Wheatstone full-bridge circuit. For example, when the number of to-be-detected columns is four, four strain gauges 2 are arranged on the target detection points of each to-be-detected column, and the four strain gauges 2 are arranged on the four bridge arms of the Wheatstone bridge circuit 31 to form a Wheatstone full-bridge circuit.

[0071] The above-mentioned mold clamping force monitoring device comprises the positioning tool of any one of the above solutions, at least two strain gauges 2 and a strain transmitter 3. The positioning tool can quickly and accurately determine the corresponding target detection points on each corin column. After the target detection points are determined, each strain gauge 2 can be correspondingly arranged at the target detection point of each corin column to be detected. Since each strain gauge 2 is connected to the bridge arm of the Wheatstone bridge circuit 31, when the strain gauge 2 deforms under the action of the mold clamping force of the injection mold, the Wheatstone bridge circuit 31 of the strain transmitter 3 can generate a voltage output signal proportional to the resistance change of the strain gauge 2 based on the strain of each strain gauge 2. The signal processing circuit 32 of the strain transmitter 3 can obtain mold clamping force information according to the amplified voltage output signal, thereby achieving the measurement of the mold clamping force. By monitoring the mold clamping force, the fracture of the corin column caused by uneven stress can be avoided, and the yield and quality of the injection molded parts can be improved.

[0072] In one embodiment, as shown in Figure 5 The mold clamping force monitoring device further comprises a human-computer interaction device 4, which is in communication connection with the strain transmitter 3. The human-computer interaction device 4 is connected with the strain transmitter 3 through a signal transmission line (such as a serial bus).

[0073] The human-computer interaction device 4 can be used as a computer device for finally processing the mold clamping force data. The mold clamping force data is received by the human-computer interaction device 4, and the mold clamping force is calculated according to the mold clamping force data. The mold clamping force can be interactively displayed.

[0074] In application, the human-computer interaction device 4 can also calculate the imbalance degree of each corin column in each mold clamping process, and output a prompt information when the imbalance degree reaches a set threshold. The prompt signal can include at least one of sound information, light information and vibration information.

[0075] In one embodiment, as shown in Figure 6 The mold clamping force monitoring device further comprises an alarm unit 5, which is in electrical connection with the human-computer interaction device 4.

[0076] The alarm unit 5 can be an audible and light alarm unit 5, a light alarm unit 5 or a light alarm unit 5. For example, the alarm unit 5 can be a buzzer. The alarm unit 5 is in electrical connection with the human-computer interaction device 4, and can be controlled by the human-computer interaction device 4 to alarm.

[0077] In application, when the imbalance degree calculated in the foregoing embodiments of the human-computer interaction device 4 reaches a set threshold, the alarm unit 5 is controlled to alarm, so as to prompt the staff.

[0078] In one embodiment, as shown in Figure 7 and Figure 8As shown, the mold locking force monitoring device further comprises a protective cover 6 provided with a protective groove 61, the protective cover 6 is adapted to be mounted on the outer circumferential surface of the column to be detected, and the protective groove 61 is used to accommodate the strain gauge 2.

[0079] It can be understood that, after the strain gauge 2 is arranged at the target detection point, the strain gauge 2 is buckled through the protective groove 61 of the protective cover 6, a protective space is formed in cooperation with the column, the strain gauge 2 is protected by the protective cover 6, and displacement or damage of the strain gauge 2 due to external force collision, friction and other factors in the subsequent use process can be avoided. In addition, the protective cover 6 also provides a relatively closed and safe working environment for the strain gauge 2, effectively reduces the interference of external environmental factors (such as dust, humidity, etc.) on the measurement accuracy of the strain gauge 2, and ensures the accuracy and reliability of the measurement data of the strain gauge 2.

[0080] In one embodiment, as shown in Figure 7 and Figure 8 As shown, the protective cover 6 comprises a protective shell 62 and a magnetic attraction piece (not shown in the figure), the magnetic attraction piece is arranged on the protective shell 62, and the protective shell 62 is adapted to be adsorbed on the outer circumferential surface of the column to be detected through the magnetic attraction piece.

[0081] Among them, the protective shell 62 is the main structural part of the protective cover 6, has a certain shape and strength, and can play a role in protecting the strain gauge 2. The magnetic attraction piece can be a small permanent magnet or an electromagnet.

[0082] In application, when it is necessary to install the protective cover 6 on the outer circumferential surface of the column, the protective cover 6 is only needed to be close to the column, the magnetic attraction piece will generate a magnetic force with the surface of the column or the corresponding magnetic attraction part on the column, and then tightly adsorbed on the outer circumferential surface of the column, so that the convenient installation of the protective cover 6 is realized. In one example, the side surface of the protective cover 6 is also provided with a wiring hole 64, so that the strain gauge 2 passes through the wiring hole 64 and is connected with the strain transmitter 3.

[0083] Exemplarily, the magnetic attraction piece is an electromagnet, the two side surfaces of the protective cover 6 are respectively provided with a magnet mounting groove 63, the magnet mounting groove 63 is communicated with the protective groove 61 through a transmission line hole 65, the electromagnet is fixed in the magnet mounting groove 63, and the power supply line of the electromagnet is out of the mounting groove through the transmission line hole 65.

[0084] In one embodiment, the outer surface of the protective cover 6 can also be provided with an auxiliary groove 66, the auxiliary groove 66 is adapted to a fastener, the fastener can be a hoop, and the auxiliary groove 66 is used to fix the protective cover 6 on the column in cooperation with the fastener.

[0085] The embodiment of the present application also provides a mold locking force monitoring system, comprising an injection molding machine and the mold locking force monitoring device according to any one of the above solutions.

[0086] The beneficial effects of the mold clamping force monitoring system relative to the related art are the same as the beneficial effects of the mold clamping force monitoring device relative to the related art, which will not be repeated here.

[0087] The above merely describes exemplary embodiments of the present application, and does not limit the patent scope of the present application. Any equivalent structural transformation, direct / indirect application in other related technical fields, or the like, made under the technical concept of the present application, using the content of the present application specification and drawings, is included in the patent protection scope of the present application.

Claims

1. A positioning fixture, characterized by, The positioning tool comprises: a sliding seat adapted to slide with the corinthian column; a horizontal measurement mechanism arranged on the sliding seat and configured to detect the relative relationship between the reference surface of the sliding seat and the horizontal plane; a distance measurement mechanism arranged on the sliding seat and configured to detect the distance between the sliding seat and the reference target.

2. The positioning fixture of claim 1, wherein The sliding seat comprises opposite first and second surfaces, the first surface is provided with a sliding groove adapted to the outer circumferential surface of the corinthian column, and the horizontal measurement mechanism and the distance measurement mechanism are arranged on the second surface respectively.

3. The positioning fixture of claim 2, wherein The second surface is provided with a first groove extending in a first direction and a second groove extending in a second direction, the first groove is used for mounting the distance measurement mechanism, and the second groove is used for mounting the horizontal measurement mechanism, wherein the first direction intersects the second direction.

4. The positioning fixture of claim 2, wherein The positioning tool further comprises a limiting piece which is detachably connected to the second surface and is used for limiting the distance measurement mechanism in the first groove arranged in the first direction on the second surface.

5. The positioning fixture of claim 3, wherein The positioning tool further comprises a first fixing bolt and a second fixing bolt, the sliding seat is provided with a first screw hole and a second screw hole respectively, the first screw hole is in communication with the first groove, and the second screw hole is in communication with the second groove; the first fixing bolt is threadedly connected with the first screw hole and applies pressure to the distance measurement mechanism, so that the distance measurement mechanism is fixed in the first groove; the second fixing bolt is threadedly connected with the second screw hole and applies pressure to the horizontal measurement mechanism, so that the horizontal measurement mechanism is fixed in the second groove.

6. A clamp force monitoring device characterized by, The positioning tool comprises: The positioning tool according to any one of claims 1 to 5 is used for positioning a target to-be-detected point on a to-be-detected corinthian column; at least two strain gauges, each of which is arranged on the target to-be-detected point of each to-be-detected corinthian column; a strain transmitter comprising a Wheatstone bridge circuit and a signal processing circuit, each strain gauge is connected to a bridge arm of the Wheatstone bridge circuit, the Wheatstone bridge circuit is used for generating a voltage output signal proportional to the change of the strain gauge resistance based on the strain of each strain gauge, and the signal processing circuit is used for amplifying the voltage output signal and generating a clamping force data according to the amplified voltage output signal.

7. The clamp force monitoring apparatus of claim 6, wherein, The clamping force monitoring device further comprises a human-computer interaction device which is in communication connection with the strain transmitter.

8. The clamp force monitoring apparatus of claim 7, wherein, The clamping force monitoring device further comprises an alarm unit which is in electrical connection with the human-computer interaction device.

9. The clamp force monitoring apparatus of any of claims 6 to 8, wherein, The clamping force monitoring device further comprises a protective cover which is provided with a protective groove and is adapted to be mounted on the outer circumferential surface of the to-be-detected corinthian column, and the protective groove is used for accommodating the strain gauge.

10. A clamp force monitoring system characterized by, The clamping force monitoring device comprises an injection molding machine and any one of claims 6 to 9. The clamping force monitoring device comprises an injection molding machine and any one of claims 6 to 9.

Images