Suspension type large-mass comparator

Abstract

The invention relates to a suspension type large-mass comparator, which belongs to the field of mass comparators, is cylindrical in appearance, is hung on a crane by a three-jaw hanger, and can be adjusted to be horizontal. A sensor pressing plate is arranged above the sensor, a connecting rod is arranged in the center of the pressing plate and connected with a pull rod through a clutch assembly, and the lower end of the pull rod is connected with a weight hanging ring; a top plate sinking barrel is arranged in the middle of a top plate of the servo electric cylinder, and a concave spherical surface saddle is arranged in the barrel and can lift a pull rod. The servo electric cylinder can enable the clutch assembly to be separated and connected, two states of measuring whether the system is stressed or not are presented, and hoisting and measuring can be carried out step by step. The comparator has repeatability conditions of comparison and measurement: 1, the horizontal state is not changed, 2, the loading speed is constant and slow and the impact force is consistent during measurement, and 3, the sensor is in a larger circumference and the tension point is in the center, so that unbalance loading is eliminated; and the measurement and transmission precision requirements of M-grade large weights can be met.

Description

Technical Field

[0001] The invention relates to the technical field of mass comparators, and in particular to a suspended large-mass comparator. Background Art

[0002] Mass comparator is widely used for weight detection and measurement transmission. For M-level large mass weights, the maximum value of the measurement range can reach 500kg, 1t, 2t, and the actual graduation value can reach 2g, 5g, 10g. Due to the large measurement range and high precision requirements, a platform-type mass comparator installed on the ground is usually selected. When testing weights, use a lifting device to place the standard weights, the weights to be tested, and the standard weights on the comparator in turn to read the measurement results. In order to avoid the weights impacting the comparator and affecting the measurement results, loading must be done slowly, and the time intervals between loading and measurement should be as consistent as possible. In order to obtain accurate measurement results, the weights need to be loaded to the center of the comparator platform as much as possible with the assistance of the test personnel to reduce eccentric loading. Although the measurement accuracy of the platform mass comparator can meet the requirements, according to the national metrology verification regulations, when testing a weight, the tested weight needs to be measured once, and the standard weight needs to be measured twice. After each measurement of a weight, the weight needs to be lifted, placed in the comparator, and then lifted and removed. The weight is lifted six times and placed three times during the test. The whole process of lifting and placing weights is frequent, which is inefficient. The degree of personnel participation during the test is high. If the operation is not standardized, the impact force and positional eccentricity of the weight placement will lead to the introduction of human measurement errors. In addition, excessive impact when placing the weight during the test can easily damage the comparator.

[0003] When a platform-type mass comparator detects large mass weights, a crane must be used as an auxiliary equipment for loading, and the requirements for the crane are relatively high. It is best to use a variable frequency crane with a very slow speed. Both lifting and placing weights require careful cooperation from the inspectors, which is labor-intensive and time-consuming. Therefore, weight inspectors very much hope to have a large mass comparator in the form of a hook scale to meet the detection needs of large mass weights. During the detection, the mass comparator in the form of a hook scale is hung on the crane hook and used directly, which eliminates the step of placing weights on the platform. It can be measured by lifting it up without moving it. Therefore, some researchers have made relevant attempts. Their solution is to form a weighing system with a high-precision pull sensor and a high-precision instrument. During detection, the upper end is hung on the crane hook and the lower end is hung with weights. After lifting, a measurement can be performed, which saves the step of placing weights on the platform. However, the technical solution that only requires the accuracy of sensors and instruments cannot make the hook-type mass comparator meet the detection accuracy requirements of large mass weights. The reason is that such a structure cannot cope with the problems caused by the use conditions: the comparator is a high-precision measuring instrument. To measure the difference between two weights with the same nominal mass, this difference is very small, so the two measurements must have repeatable measurement conditions, that is, the conditions for measuring the standard weight and the tested weight are consistent. These conditions include the impact force during loading, the horizontal state of the comparator, the eccentric state of the hoisted weight relative to the measuring system, and the influence of the lateral force of the weight swing on the measuring system; if any of these conditions is not met, the difference obtained from the two measurements is not the actual difference between the tested weight and the standard weight. This difference may be several times or even dozens of times the actual difference. In summary, the current hook scale type mass comparator does not have repeatable measurement conditions because it cannot cope with the problems caused by the operating conditions, and therefore cannot meet the requirements of the national metrological verification regulations. Therefore, no large-mass comparator in the form of a hook scale can be used in actual weight detection work. In order to realize the detection of large-mass weights by a large-mass comparator in the form of a hook scale, in addition to using the same high-precision sensors and instruments as the platform-type mass comparator, the key is to use a special structural design to create good repeatable measurement conditions in response to the problems caused by the actual operating conditions. Summary of the invention

[0004] The object of the present invention is to provide a suspended large-mass comparator, which can ensure the consistency of impact force during loading, keep the horizontal state of the comparator unchanged, eliminate the overload state of the suspended weight on the measuring system, and avoid the influence of the lateral force of the weight swing on the measuring system, so that the measurement accuracy of the suspended large-mass comparator is guaranteed and can be used for the detection of M-level large-mass weights.

[0005] The technical problem solved by the present invention can be achieved by adopting the following scheme: a suspended large-mass comparator comprises a cylinder, a sensor support plate is fixedly mounted on the inner wall of the cylinder, a sensor is fixedly mounted on the sensor support plate, a sensor cover plate capable of pressing on the sensor is arranged above the sensor, a cylinder body of a servo electric cylinder is arranged below the sensor support plate, the bottom of the cylinder body is fixed on the bottom plate of the cylinder, the bottom plate of the cylinder is fixedly mounted on the inner wall of the cylinder, a lead screw is arranged at the upper end of the cylinder body, the upper end of the lead screw passes through the sensor support plate and is fixed to the bottom of the top plate of the servo electric cylinder, the top plate of the servo electric cylinder is located at the sensor Between the sensor cover plate and the sensor support plate, a pull rod is passed through the center of the servo electric cylinder top plate, the upper end of the pull rod is fixedly connected to the clutch assembly pressure head, and the lower end is connected to a lifting ring for hoisting weights, and the pull rod is located below the clutch assembly pressure head and fixedly installed with a pull rod spherical lifting head that can press on the servo electric cylinder top plate. A connecting rod is passed through the center of the sensor cover plate, the upper end of the connecting rod is fixedly connected to a connecting rod spherical pull head that presses on the sensor cover plate, and the lower end is fixedly installed with a clutch assembly saddle, and the pull rod and the connecting rod can be separated and connected through the clutch assembly saddle that matches the clutch assembly pressure head;

[0006] When the lead screw of the servo electric cylinder rises, it can push the spherical lifting head and the pull rod to rise, thereby driving the clutch assembly pressure head of the pull rod to rise and separate from the clutch assembly saddle; when the lead screw of the servo electric cylinder retracts, the spherical lifting head and the pull rod lose their support and descend under the action of their own gravity and the weight, thereby causing the clutch assembly pressure head of the pull rod to descend and connect with the clutch assembly saddle.

[0007] Furthermore, the clutch assembly saddle is a hollow cavity with a bottom hole, the upper end of the pull rod passes through the bottom hole of the clutch assembly saddle into the hollow part of the clutch assembly saddle, and the clutch assembly pressure head of the pull rod can be crimped on the bottom of the hollow part of the clutch assembly saddle; the lower end of the clutch assembly pressure head is shaped like an inverted cone, and the part of the clutch assembly saddle connected thereto is arranged as a tapered hole; the clutch assembly pressure head and the pull rod are detachably fixedly connected via threads.

[0008] Furthermore, a lifting concave spherical saddle is fixedly installed in the top plate sinking barrel of the servo electric cylinder top plate, the pull rod spherical lifting head is a spherical shape that matches the lifting concave spherical saddle, and the pull rod spherical lifting head can be pressed on the lifting concave spherical saddle; the lifting concave spherical saddle is located below the clutch assembly saddle, and the clutch assembly saddle is located in the top plate sinking barrel arranged on the servo electric cylinder without contact, the top plate sinking barrel and the servo electric cylinder top plate are integrally arranged, and a through hole for inserting the pull rod is arranged in the middle of the lifting concave spherical saddle.

[0009] Furthermore, a cover plate concave spherical saddle is fixedly mounted on the sensor cover plate, the connecting rod spherical pull head is a spherical shape that matches the cover plate concave spherical saddle, and the connecting rod spherical pull head can be pressed on the cover plate concave spherical saddle; the connecting rod and the clutch assembly saddle are detachably fixedly connected by threads, and a through hole for penetrating the connecting rod is provided in the center of the cover plate concave spherical saddle.

[0010] Furthermore, a guide positioning seat is fixedly installed at the center of the cylinder bottom plate, a conical hole is opened in the guide positioning seat, and a guide positioning block that matches the conical hole of the guide positioning seat and can be embedded in the conical hole is fixedly installed on the pull rod and located above the lifting ring.

[0011] Furthermore, three sensors are arranged at equal intervals in the circumferential direction on the sensor support plate, and three servo electric cylinders are arranged at equal intervals in the circumferential direction on the cylinder bottom plate, and the three servo electric cylinders and the three sensors are arranged alternately; the central angle between adjacent servo electric cylinders and sensors is 60°, and the central angle between adjacent sensors is 120°; the shape of the servo electric cylinder top plate and the sensor cover plate is a triangular star design, and the shape of the sensor support plate is a circular ring design, which can reduce its weight to achieve the weight reduction of the overall equipment and facilitate carrying to on-site work, and also facilitate the installation and maintenance of various components.

[0012] Furthermore, each of the servo electric cylinders is equipped with a power unit for driving the lead screw of the servo electric cylinder.

[0013] Furthermore, a display instrument connected to the sensor and a PLC controller connected to the power unit are fixedly mounted on the cylinder.

[0014] Furthermore, a reinforcement ring is welded on the top outer edge of the cylinder, three hanging rings are installed on the reinforcement ring at equal intervals, and three evenly arranged handles are installed on the outside of the cylinder, and the three handles correspond to and are connected to the three hanging rings one by one.

[0015] Furthermore, the three hanging rings on the cylinder are connected to a three-claw sling, which includes a rotating hanging ring, a hanging ring seat and a closed flower basket. The rotating hanging ring is installed on the hanging ring seat, and three evenly arranged positioning pins are installed on the hanging ring seat. There are three closed flower baskets in total, and the length of the closed flower basket can be adjusted. The upper end of the closed flower basket is connected to the positioning pin on the hanging ring seat, and the lower end is connected to the hanging ring on the reinforcement ring.

[0016] The working principle of the suspended large mass comparator of the present invention is as follows: first, the standard weight is lifted for measurement; after the standard weight is removed, the weight to be tested is lifted for measurement; after the measurement is completed, the weight to be tested is removed again, and the standard weight is lifted for measurement again. The difference between the weight to be tested and the standard weight is obtained by subtracting the average of the two previous and subsequent standard weight measurements from the measured value of the tested weight.

[0017] Usage method and beneficial effects: When the suspended large mass comparator of the present invention detects the weight, the suspended large mass comparator is hung on the hook of a crane, and the servo electric cylinder is started first. The lead screw of the servo electric cylinder rises, driving the spherical lifting head and the pull rod to rise, thereby driving the clutch assembly pressure head of the pull rod to rise and separate from the clutch assembly saddle. In this state, the crane is started again to suspend the weight on the lifting ring at the lower end of the pull rod of the mass comparator. Since the clutch assembly pressure head of the pull rod is in a separated state from the clutch assembly saddle, the pull rod connected to the connecting rod through the clutch assembly saddle is in a separated state from the connecting rod at this time. The weight suspended below the pull rod cannot transmit the pulling force applied to the pull rod to the connecting rod, nor can it convert the pulling force into pressure through the connecting rod pull head on the connecting rod and apply it to the sensor cover. At this time, the sensor is in a state of not bearing the pressure formed by the weight. Therefore, the impact force generated by the uncontrollable lifting speed of the crane at the moment of lifting of the suspended large mass comparator of the present invention is borne by the servo electric cylinder connected to the pull rod through the servo electric cylinder screw, but not by the measurement system for detecting the mass of the weight; the lateral force formed by the swing of the weight at the moment of lifting and when the crane moves after lifting is also borne by the servo electric cylinder, and will not act on the measurement system for detecting the mass of the weight.

[0018] After the crane moves the weight to the measuring position, the inspector can apply external force to make the suspended large mass comparator stop swinging as soon as possible (small swing is inevitable). At this time, the measurement phase is entered, and the servo electric cylinder is started. The lead screw of the servo electric cylinder retracts to make the spherical lifting head and the pull rod drop, thereby driving the clutch assembly pressure head of the pull rod to drop and connect with the clutch assembly saddle. The connection between the clutch assembly pressure head and the clutch assembly saddle makes the pull rod and the connecting rod in a connected state. The weight suspended under the pull rod transmits the tension applied to the pull rod to the connecting rod through the clutch assembly saddle. The tension transmitted to the connecting rod is converted into pressure and applied to the sensor cover through the connecting rod pull head. The sensor bears the pressure applied by the sensor cover through the connecting rod pull head, and the mass of the weight is measured by measuring the pressure applied to it. During the measurement phase, the weight swings slightly. Because the sensor is not set on the pull rod of the hoisting weight and the connecting rod connected to the pull rod, the sensor will not swing with the swing of the weight.

[0019] The suspended large-mass comparator of the present invention isolates the lifting and moving stages of the weight and the measuring stage of the weight. The sensor does not measure during the lifting and moving stages, and the impact force generated during the lifting and moving stages does not act on the sensor, and the swing of the weight will not affect the sensor. During the measurement stage, the sensor does not swing with the swing of the weight, and the swing of the weight will not generate lateral force on the sensor. The suspended large-mass comparator of the present invention overcomes the impact and swing during the lifting, moving, and measuring processes on the sensor, reduces the eccentric load error of the measurement, ensures the repeatability of the measurement, and improves the accuracy of the weight detection. Therefore, it is suitable for the detection of large-mass weights with high precision requirements. Compared with the platform-type mass comparator, the suspended large-mass comparator of the present invention can complete a measurement after lifting, eliminating the link of placing the weight on the platform. The detection process is simple and efficient, and the degree of personnel participation is reduced. It can avoid causing human measurement errors, and there will be no phenomenon of overloading and damaging the mass comparator.

[0020] The suspended large mass comparator has five sufficient conditions for accurate measurement: (1) The three-claw sling designed in this application can pre-adjust the suspended large mass comparator to a horizontal state. The three force points of the three-claw sling are evenly distributed on the circumference, and the gravity point is at the center of the circle, which can ensure the repeatability of the horizontal state during use. (2) The clutch assembly of the suspended large mass comparator is in a separated state when the weight is lifted and the crane moves after lifting the weight. The uncontrollable impact force during lifting and the lateral force of the weight swinging during driving will not act on the measurement system, and the servo electric cylinder that controls the clutch assembly has the same and slow extension speed each time, which effectively controls the impact of the lifted weight loading on the measurement system and provides the repeatability of the loading force. (3) The spherical lifting head of the pull rod will automatically reset under the action of the weight gravity, the tapered hole matching of the guide positioning block and the guide positioning seat, and the matching of the clutch assembly pressure head of the pull rod and the clutch assembly saddle can ensure that the position of the pull rod is always consistent when it is lifted and then dropped, ensuring the repeatability of the force point position. (4) The sensor is installed on a larger circle with the pulling point at the center of the circle, which can eliminate the eccentric load to the greatest extent and ensure the repeatability of the eccentric load. (5) The spherical pull head of the connecting rod can swing in the concave spherical saddle of the cover plate, which can eliminate the lateral force caused by the small swing of the weight during measurement (small swing during measurement is inevitable). The entire design ensures the repeatability of the comparative measurement based on the characteristics of the operating conditions, ensuring that the suspended large mass comparator and the platform comparator have the same measurement accuracy, meeting the measurement transmission needs of M-level large mass weights. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0022] Figure 1 It is a schematic diagram of the external structure of the suspended large mass comparator of the present invention;

[0023] Figure 2 It is a cross-sectional view of the suspended large mass comparator of the present invention, and the clutch assembly is in a separated state;

[0024] Figure 3 It is a cross-sectional view of the suspended large mass comparator of the present invention, with the clutch assembly in a fitted state;

[0025] Figure 4 It is a schematic diagram of the internal structure of the suspended large mass comparator of the present invention;

[0026] Figure 5 It is a 3 / 4 cutaway structural schematic diagram of the suspended large mass comparator of the present invention;

[0027] Figure 6 It is a structural schematic diagram of a sensor cover plate of a suspended large mass comparator of the present invention;

[0028] Main parts and numbers:

[0029] Cylinder body: 1; Cylinder wall: 11; Cylinder cover: 12; Cylinder bottom plate: 13;

[0030] Sensor: 2; Sensor support plate: 21; Sensor cover: 22; Cover concave spherical saddle: 221;

[0031] Servo electric cylinder: 3; cylinder body: 31; lead screw: 32; power unit: 33; servo electric cylinder top plate 321; top plate sinking barrel: 322; lifting concave spherical saddle: 3221;

[0032] Connecting rod: 4; Connecting rod spherical puller: 41;

[0033] Tie rod: 5; tie rod spherical lifting head: 51; guide positioning block: 52; lifting ring: 53;

[0034] Clutch assembly saddle: 61; Clutch assembly pressure head: 62;

[0035] Guide positioning seat: 7;

[0036] PLC controller: 81; display instrument: 82;

[0037] Eyelet seat: 91; closed flower basket: 92; hanging ring: 93; handle: 94; positioning pin: 95; reinforcement ring: 96; rotating eyelet: 97. DETAILED DESCRIPTION

[0038] In order to more clearly demonstrate the objectives, technical solutions and advantages of the present invention, the embodiments of the present invention will be further described in detail below with reference to the accompanying drawings.

[0039] Example

[0040] Figure 1-6 FIG. 1 is a structural diagram of a suspended large mass comparator according to the present embodiment. Figure 1 As shown, the suspended large mass comparator includes a cylinder 1, which is in the shape of a cylinder. Figure 2-5 As shown, a sensor support plate 21 is fixedly installed at the middle and upper part of the inner wall of the cylinder 1, and a sensor 2 is fixedly installed on the sensor support plate 21. In this embodiment, the sensor 2 adopts a pressure-oriented S-shaped sensor, for example, a C6-grade pressure-oriented sensor is adopted. A sensor cover plate 22 is arranged above the sensor 2, and the sensor cover plate 22 is pressed on the sensor 2. A cylinder body 31 of a servo electric cylinder 3 is installed below the sensor support plate 21. The servo electric cylinder 3 is a servo electric cylinder, including a cylinder body 31 and a lead screw 32. The bottom of the cylinder body 31 is fixed on the cylinder bottom plate 13, and the cylinder bottom plate 13 is fixedly installed on the inner wall of the cylinder 1, located in the middle part of the inner wall of the cylinder 1. A lead screw 32 is arranged on the upper end of the cylinder body 31, and the upper end of the lead screw 32 passes through the sensor support plate 21 and is fixed to the bottom of the servo electric cylinder top plate 321. The servo electric cylinder top plate 321 is located between the sensor cover plate 22 and the sensor support plate 21. A lifting concave spherical saddle 3221 is fixedly installed in the top plate sinking barrel 322 of the servo electric cylinder top plate 321, through The extension and retraction of the lead screw 32 realizes the lifting action of the lifting concave spherical saddle 3221. A pull rod 5 is passed through the center of the servo electric cylinder top plate 321. The upper end of the pull rod 5 is fixedly connected to the clutch assembly pressure head 62, and the lower end is connected to the lifting ring 53 for lifting the weight. The pull rod 5 is located below the clutch assembly pressure head 62 and is fixedly installed with a pull rod spherical lifting head 51 on the lifting concave spherical saddle 3221 that can press on the top plate sinking barrel 322. The sensor cover plate 22 is passed through a connecting rod 4 The upper end of the connecting rod 4 is fixedly connected with a connecting rod spherical pull head 41 pressed on the sensor cover plate 22. The connecting rod spherical pull head 41 can apply tension to the sensor cover plate 22 through the cover plate concave spherical saddle 221 fixedly installed on the sensor cover plate 22. The lower end of the connecting rod 4 is fixedly installed with a clutch assembly saddle 61. The clutch assembly pressure head 62 of the pull rod 5 can connect or separate the clutch assembly saddle 61 to connect or separate the clutch assembly saddle 61, so as to connect or separate the pull rod 5 and the connecting rod 4. In this embodiment, the clutch assembly pressure head 62 and the clutch assembly saddle 61 together constitute a clutch assembly.

[0041] When the lead screw 32 of the servo electric cylinder 3 rises, it can push the spherical lifting head 51 of the pull rod and the pull rod 5 to rise, thereby driving the clutch assembly pressure head 62 of the pull rod 5 to rise and separate from the clutch assembly saddle 61. At this time, the pull rod 5 and the connecting rod 4 are in a separated state, and the tension applied to the pull rod 5 by the weight hoisted on the lifting ring 53 of the pull rod 5 cannot be transmitted to the connecting rod 4 through the clutch assembly saddle 61, and further, the connecting rod spherical pull head 41 cannot convert the tension into pressure and transmit it to the sensor cover 22. The sensor 2 does not bear the pressure applied by the sensor cover 22 through the connecting rod spherical pull head 41, so the sensor 2 is in a state of not bearing tension. When the lead screw 32 of the servo electric cylinder 3 retracts, the lifting concave spherical saddle 3221 also descends, and the pull rod spherical lifting head 51 and the pull rod 5 lose their support and descend under the action of their own gravity and the weight, thereby driving the clutch assembly pressure head 62 of the pull rod 5 to descend and connect with the clutch assembly saddle 61. At this time, the pull rod 5 and the connecting rod 4 are in a connected state, and the pulling force applied by the weight hoisted on the lifting ring 53 of the pull rod 5 to the pull rod 5 is transmitted to the connecting rod 4 through the clutch assembly, and then the connecting rod spherical pull head 41 converts the pulling force into pressure and transmits it to the sensor cover 22. The sensor 2 is subjected to the pressure applied by the sensor cover 22 through the connecting rod spherical pull head 41. This state is a complete measurement state, which can measure the mass of the weight.

[0042] When the suspended large mass comparator of this embodiment detects the weight, the suspended large mass comparator is first hung on the crane hook, and the servo electric cylinder 3 is started before lifting the weight. The screw 32 of the servo electric cylinder 3 rises and pushes the spherical lifting head 51 and the pull rod 5 to rise, thereby driving the clutch assembly pressure head 62 of the pull rod 5 to rise and separate from the clutch assembly saddle 61. In this state, the crane is started again to suspend the weight on the lifting ring 53 at the lower end of the mass comparator pull rod 5. Since the clutch assembly pressure head 62 of the pull rod 5 is in a separated state from the clutch assembly saddle 61, the weight suspended below the pull rod 5 cannot transmit the tension applied to the pull rod 5 to the connecting rod 4, nor can it convert the tension into pressure through the connecting rod spherical pull head 41 on the connecting rod 4 and apply it to the sensor cover 22. The sensor 2 does not bear the pressure applied by the sensor cover 22 through the connecting rod spherical pull head 41. At this time, the sensor 2 is in a state of not bearing the tension of the weight. Therefore, the impact force generated by the uncontrollable lifting speed of the crane at the moment of lifting of the suspended large mass comparator of this embodiment is borne by the servo electric cylinder 3 connected to the pull rod 5 through the servo electric cylinder 3 screw 32, but not by the sensor 2 for detecting the mass of the weight; the lateral force formed by the swing of the weight at the moment of lifting and when the crane moves after lifting is also borne by the servo electric cylinder 3, and will not act on the sensor 2 for detecting the mass of the weight.

[0043] After the crane moves the weight to the measuring position, in order to speed up the measurement, the weight can be manually intervened to make it still. At this time, the measurement phase is entered, the servo electric cylinder 3 is started, the lead screw 32 of the servo electric cylinder 3 retracts, driving the lifting concave spherical saddle 3221 to descend, the spherical lifting head 51 of the pull rod and the pull rod 5 lose the lifting, and the pull rod 5 descends under the gravity of itself and the weight, and the clutch assembly pressure head 62 of the pull rod 5 descends and connects with the clutch assembly saddle 61. The connection between the component pressure head 62 and the clutch assembly saddle 61 makes the pull rod 5 and the connecting rod 4 in a connected state. The weight suspended under the pull rod 5 transmits the tension applied to the pull rod 5 to the connecting rod 4 through the clutch assembly saddle 61. The tension transmitted to the connecting rod 4 is converted into pressure applied to the sensor cover 22 through the connecting rod spherical pull head 41. The sensor 2 bears the pressure applied by the sensor cover 22 through the connecting rod spherical pull head 41, and the mass of the weight is measured by measuring the pressure applied thereon. If the weight swings slightly during the measurement stage, since the connecting rod spherical pull head 41 can rotate freely in the concave spherical saddle 221 of the cover, the lateral force of the weight swing will not be transmitted to the sensor 2, and the measurement system will not be affected by the lateral force (the measurement system of this embodiment includes the sensor 2, the sensor cover 22, the concave spherical saddle 221 of the cover, the connecting rod 4, and the connecting rod spherical pull head 41). The sensor 2 is indirectly connected to the weight and can bear the full weight of the weight, but will not swing with the swing of the weight, thereby increasing the stability of the measurement system.

[0044] For the structure of the cylinder 1, further, as Figure 1 As shown, the cylinder body 1 includes a cylinder wall 11 and a cylinder cover 12 that can be covered on the cylinder wall 11. Further, the cylinder cover 12 is detachably fixed on the cylinder wall 11 by bolts. Figure 2-5 As shown, the sensor support plate 21 is fixedly mounted on the inner wall of the cylinder wall 11. For the sensor cover plate 22, further, a sensor pressure head groove is provided below the sensor cover plate 22 at a position corresponding to the sensor 2, so that the sensor cover plate 22 can be pressed on the pressure head of the sensor 2 without changing the position.

[0045] In order to load the weight at the center of the mass comparator to ensure the accuracy of the measurement results, further, three sensors 2 are arranged at equal intervals on the sensor support plate 21 along the circumferential direction, and three servo electric cylinders 3 are arranged at equal intervals on the larger circumference of the cylinder bottom plate 13. The three servo electric cylinders 3 and the three sensors 2 are arranged alternately; the central angle between adjacent servo electric cylinders 3 and sensors 2 is 60°, and the central angle between adjacent sensors 2 and sensors 2 is 120°; the shape of the servo electric cylinder top plate 321 and the sensor cover plate 22 is a triangular star design, and the shape of the sensor support plate 21 is a circular ring design. Firstly, its weight can be reduced to achieve the weight reduction of the overall equipment and it is convenient to carry to the on-site work. Secondly, it is convenient for the installation and maintenance of various components. The circular ring design of the sensor support plate 21 can also facilitate the sinking barrel 61 to pass through the ring.

[0046] In order to eliminate the influence of eccentric loading on the measurement results, further, on the sensor support plate 211, with the center of the sensor support plate 211 as the center of the circle, three sensors 2 are arranged at equal intervals along the circumferential direction in this embodiment, and one sensor 2 is installed every 120 degrees. Since the pull rod 5 passes through the center of the sensor support plate 21, the pulling point formed by the weight is located at the center of the circle where the three sensors 2 are located. The gravity line of the weight after lifting passes through the center of the circle and is perpendicular to the plane where the three sensors 2 are located, which can well eliminate the influence of eccentric loading on the measurement results and ensure the measurement repeatability conditions. In order to further eliminate the influence of eccentric loading, further, the three sensors 2 have the same sensitivity.

[0047] As for the specific structural form of the servo electric cylinder 3, the servo electric cylinder 3 in this embodiment adopts an existing servo electric cylinder. In order to drive the servo electric cylinder 3 to move, a power unit 33 for driving the screw 32 of the servo electric cylinder 3 is further installed on the outer wall of the cylinder body 31 of the servo electric cylinder 3. In this embodiment, the power unit 33 is a servo motor. In this embodiment, the servo electric cylinder 3 can load the weight of the hoisted weight onto the sensor 2 at a constant speed. The loading speed is controllable and consistent each time, ensuring the repeatability of the impact force on the sensor 2 each time, which can further eliminate the impact on the sensor 2.

[0048] In order to further eliminate the influence of the swing of the weight on the sensor 2, further, as Figure 2-5As shown, a top plate sinking barrel 322 is integrally provided at the center of the top plate 321 of the servo electric cylinder, and a lifting concave spherical saddle 3221 is fixedly installed at the center of the lower part of the top plate sinking barrel 322. The pull rod spherical lifting head 51 is in a spherical shape that matches the lifting concave spherical saddle 3221, and the pull rod spherical lifting head 51 can be pressed on the lifting concave spherical saddle 3221. The lifting concave spherical saddle 3221 is located below the clutch assembly saddle 61. The assembly saddle 61 is located in the top plate sinking barrel 322 on the top plate 321 of the servo electric cylinder, and does not contact. The middle part of the lifting concave spherical saddle 3221 is provided with a through hole for inserting the pull rod 5. The top plate sinking barrel 322 is integrally arranged with the top plate 321 of the servo electric cylinder. The design of the top plate sinking barrel 322 can better utilize the internal space of the cylinder 1. The pull rod spherical lifting head 51 is pressed on the lead screw 32 of the servo electric cylinder 3 by pressing on the lifting concave spherical saddle 3221. Furthermore, the spherical pull rod spherical lifting head 51 has the same curvature as the lifting concave spherical saddle 3221, and the pull rod spherical lifting head 51 can be embedded in the lifting concave spherical saddle 3221 and can swing in the lifting concave spherical saddle 3221. During the lifting and moving process, the spherical pull rod spherical lifting head 51 and the lifting concave spherical saddle 3221 cooperate to ensure that the loading position is consistent each time under the action of gravity.

[0049] Furthermore, in order to eliminate the influence of the weight swing on the sensor 2 during the measurement process, as Figure 2-5 As shown, the sensor cover plate 22 is fixedly mounted with a cover plate concave spherical saddle 221, the connecting rod spherical pull head 41 is in a spherical shape that matches the cover plate concave spherical saddle 221, and the connecting rod spherical pull head 41 can be pressed on the cover plate concave spherical saddle 221, and the connecting rod spherical pull head 41 is pressed on the sensor cover plate 22 by pressing on the cover plate concave spherical saddle 221. Further, the spherical connecting rod spherical pull head 41 has the same curvature as the cover plate concave spherical saddle 221, and the connecting rod spherical pull head 41 can be embedded in the cover plate concave spherical saddle 221 and can swing in the cover plate concave spherical saddle 221. Further, the cover plate concave spherical saddle 221 is fixedly mounted at the center of the sensor cover plate 22. During the measurement process, the spherical connecting rod spherical pull head 41 and the cover plate concave spherical saddle 221 cooperate to ensure that the loading position is consistent each time under the weight of the weight, and can effectively overcome the lateral force formed by the small swing of the weight during the measurement process, avoiding the lateral force from being transmitted to the sensor 2. The structural design of the spherical connecting rod spherical pull head 41 and the cover plate concave spherical saddle 221 can eliminate the lateral force effect of the small swing of the weight on the sensor 2 in the 360-degree direction.

[0050] Furthermore, the connecting rod 4 and the clutch assembly saddle 61 are detachably fixedly connected via threads, and a through hole for penetrating the connecting rod 4 is provided in the middle of the cover plate concave spherical saddle 221, so as to facilitate the removal and maintenance of the connecting rod 4 and the clutch assembly saddle 61.

[0051] In order to realize the connection and separation between the clutch assembly pressure head 62 of the pull rod 5 and the clutch assembly saddle 61, further, as Figure 2-5 As shown, the clutch assembly saddle 61 is a hollow cavity, the upper end of the pull rod 5 penetrates into the hollow part of the clutch assembly saddle 61, and the clutch assembly pressure head 62 of the pull rod 5 is located in the hollow part of the clutch assembly saddle 61 and can be crimped to the bottom of the hollow part of the clutch assembly saddle 61. The clutch assembly pressure head 62 of the pull rod 5 can apply pressure to the clutch assembly saddle 61 by pressing on the bottom of the clutch assembly saddle 61. Furthermore, the lower end of the connecting rod 4 is fixedly connected to the solid part of the upper end of the clutch assembly saddle 61. When the lead screw 32 of the servo electric cylinder 3 rises to drive the clutch assembly pressure head 62 of the pull rod 5 to rise, the clutch assembly pressure head 62 is separated from the bottom of the clutch assembly saddle 61, so that the pull rod 5 is separated from the connecting rod 4. When the lead screw 32 of the servo electric cylinder 3 retracts to cause the clutch assembly pressure head 62 of the pull rod 5 to descend, the clutch assembly pressure head 62 presses the bottom of the clutch assembly saddle 61, so that the pull rod 5 is connected to the connecting rod 4. Further, in order to ensure that the clutch assembly pressure head 62 can remain in the same position after each rise and fall, the lower end of the clutch assembly pressure head 62 is in the shape of an inverted cone, and the part of the clutch assembly saddle 61 connected thereto is set as a tapered hole; the clutch assembly pressure head 62 and the pull rod 5 are detachably fixedly connected by threads.

[0052] In order to further eliminate the influence of the weight swing, a guide positioning seat 7 is fixedly installed at the center of the cylinder bottom plate 13, and a conical hole is opened on the guide positioning seat 7. A guide positioning block 52 that matches the conical hole of the guide positioning seat 7 and can be embedded in the conical hole is fixedly installed on the position above the lifting ring 53 on the pull rod 5. In the lifting and moving stage, the lead screw 32 of the servo electric cylinder 3 rises to drive the lifting concave spherical saddle 3221 to rise, and then drives the pull rod spherical lifting head 51 and the pull rod 5 to rise. The rise of the pull rod 5 can make the guide positioning block 52 installed on the pull rod 5 embed into the conical hole of the guide positioning seat 7. In this state, the crane is started again to lift the weight and move the weight to the measurement position. The lateral force formed by the swing of the weight during the lifting and moving process is borne by the guide positioning seat 7. Through the design of the guide positioning seat 7 and the guide positioning block 52, it is ensured that the violent swing when lifting and moving the weight will not cause the position of the pull rod 5 to change, and the repeatability of the measurement is guaranteed.

[0053] In order to facilitate the staff to intuitively read the weight mass measured by the suspended large mass comparator of this embodiment, further, a display instrument 82 and a PLC controller 81 connected to the sensor 2 are fixedly installed on the cylinder cover 12 of the cylinder body 1, and the weight mass value is displayed on the display instrument 82.

[0054] Furthermore, the PLC controller 81 controls the lifting distance of the lead screw 32 and controls the start and stop of the servo electric cylinder 3, thereby realizing the connection and separation between the pull rod 5 and the connecting rod 4.

[0055] Furthermore, the PLC controller 81 is provided with an external power supply interface, which is responsible for supplying power to the PLC controller 81 , the display instrument 82 , and the servo electric cylinder 3 .

[0056] Furthermore, in order to facilitate the crane to lift the suspended large-mass comparator and keep the suspended large-mass comparator in a horizontal state, a reinforcement ring 96 is welded on the top outer edge of the cylinder 1, and three hanging rings 93 are installed at equal intervals on the reinforcement ring 96. Three evenly arranged handles 94 are installed on the outside of the cylinder 1. The handles are convenient for users to move the comparator and prevent the comparator from swinging during the measurement process. The three handles 94 correspond to the three hanging rings 93 one by one and are connected.

[0057] The three hanging rings 93 on the cylinder 1 are connected to the three-claw sling, which includes a rotating hanging ring 97, a hanging ring seat 91 and a closed flower basket 92. The rotating hanging ring 97 is installed on the hanging ring seat 91. Three evenly arranged positioning pins 95 are installed on the hanging ring seat 91. There are three closed flower baskets 92 in total, and the length of the closed flower basket 92 can be adjusted. The upper end of the closed flower basket 92 is connected to the positioning pin 95 on the hanging ring seat 91, and the lower end is connected to the hanging ring 93 on the reinforcement ring 13. The length of the closed flower basket 92 is adjustable, which is used to adjust the comparator to be in a horizontal state. The rotating hanging ring 97 is hung on the crane.

[0058] When the suspended large mass comparator of the present embodiment is used to detect the weight, during the lifting and moving stage, the suspended large mass comparator is hung on the crane hook, the servo electric cylinder 3 is started, the lead screw 32 of the servo electric cylinder 3 is lifted to drive the lifting concave spherical saddle 3221 to rise, and then the spherical lifting head 51 and the pull rod 5 are lifted, thereby driving the clutch assembly pressure head 62 of the pull rod 5 to rise and separate from the clutch assembly saddle 61. In this state, the crane is started again to suspend the weight on the ring 53 at the lower end of the mass comparator pull rod 5, and then the weight is moved to the measuring Position, since the clutch assembly pressure head 62 of the pull rod 5 is in a separated state from the clutch assembly saddle 61, the pull rod 5 connected to the connecting rod 4 through the clutch assembly saddle 61 is in a separated state at this time, and the weight suspended under the pull rod 5 cannot transmit the tension applied to the pull rod 5 to the connecting rod 4, nor can it convert the tension into pressure applied to the sensor cover 22 through the connecting rod spherical pull head 41 on the connecting rod 4. The sensor 2 does not bear the pressure applied by the sensor cover 22 through the connecting rod spherical pull head 41, and the sensor 2 is in a stress-free state at this time.

[0059] After the crane moves the weight to the measuring position, the measurement phase is entered, and the servo electric cylinder 3 is started. The lead screw 32 of the servo electric cylinder 3 retracts to cause the spherical lifting head 51 and the pull rod 5 to descend, thereby driving the clutch assembly pressure head 62 of the pull rod 5 to descend and connect with the clutch assembly saddle 61. The pull rod 5 and the connecting rod 4 are in a connected state through the connection between the clutch assembly pressure head 62 and the clutch assembly saddle 61. The weight suspended under the pull rod 5 transmits the tension applied to the pull rod 5 to the connecting rod 4 through the clutch assembly saddle 61. The tension transmitted to the connecting rod 4 is converted into pressure through the connecting rod spherical pull head 41 and applied to the cover concave spherical saddle 221 and then to the sensor cover 22. The sensor 2 is subjected to the pressure applied by the sensor cover 22 through the connecting rod spherical pull head 41. The sensor 2 is in a stressed state, and the mass of the weight is measured by measuring the pressure applied thereto. If the weight swings during the measurement phase, since the sensor 2 is not arranged on the pull rod 5 for hoisting the weight and the connecting rod 4 connected to the pull rod 5, the sensor 2 will not swing with the swing of the weight.

[0060] The above is only a specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art can easily think of changes or substitutions within the technical scope disclosed by the present invention, which should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention should be based on the protection scope of the claims.

Claims

1. A suspended large mass comparator, characterized in that: The invention comprises a cylinder (1), a sensor support plate (21) is fixedly mounted on the inner wall of the cylinder (1), a sensor (2) is fixedly mounted on the sensor support plate (21), a sensor cover plate (22) capable of pressing on the sensor (2) is arranged above the sensor (2), a cylinder (31) of a servo electric cylinder (3) is arranged below the sensor support plate (21), the bottom of the cylinder (31) is fixed on the cylinder bottom plate (13), the cylinder bottom plate (13) is fixedly mounted on the inner wall of the cylinder (1), a lead screw (32) is arranged on the upper end of the cylinder (31), the upper end of the lead screw (32) passes through the sensor support plate (21) fixed to the cylinder bottom plate (13), and the lead screw (32) is fixed to the cylinder bottom plate (13). The servo electric cylinder top plate (321) is fixed at the bottom thereof, and the servo electric cylinder top plate (321) is located between the sensor cover plate (22) and the sensor support plate (21). A top plate sinking barrel (322) is provided at the center of the servo electric cylinder top plate (321), and a pull rod (5) is passed through the center of the top plate sinking barrel (322). The upper end of the pull rod (5) is fixedly connected to a clutch assembly pressure head (62), and the lower end is connected to a lifting ring (53) for hoisting a weight. A pull rod spherical lifting head (51) capable of pressing on the servo electric cylinder top plate (321) is fixedly installed at a position of the pull rod (5) below the clutch assembly pressure head (62); A connecting rod (4) is provided through the center of the sensor cover (22); the upper end of the connecting rod (4) is fixedly connected to a connecting rod spherical pull head (41) pressed on the sensor cover (22); the lower end of the connecting rod (4) is fixedly installed with a clutch assembly saddle (61); the pull rod (5) and the connecting rod (4) can be separated and connected through the clutch assembly saddle (61) adapted to the clutch assembly pressure head (62); When the lead screw (32) of the servo electric cylinder (3) rises, it can push the spherical lifting head (51) of the pull rod and the pull rod (5) to rise, thereby driving the clutch assembly pressure head (62) of the pull rod (5) to rise and separate from the clutch assembly saddle (61); when the lead screw (32) of the servo electric cylinder (3) retracts, the spherical lifting head (51) of the pull rod and the pull rod (5) lose their support and descend under the action of their own gravity and the weight, thereby causing the clutch assembly pressure head (62) of the pull rod (5) to descend and connect with the clutch assembly saddle (61).

2. The suspended large mass comparator according to claim 1, characterized in that: The clutch assembly saddle (61) is a hollow cavity with a bottom hole, the upper end of the pull rod (5) passes through the bottom hole of the clutch assembly saddle (61) into the hollow part of the clutch assembly saddle (61), and the clutch assembly pressure head (62) of the pull rod (5) can be pressed against the bottom of the hollow part of the clutch assembly saddle (61); the lower end of the clutch assembly pressure head (62) is shaped like an inverted cone, and the part of the clutch assembly saddle (61) connected to it is set as a tapered hole; the clutch assembly pressure head (62) and the pull rod (5) are detachably fixedly connected through threads.

3. The suspended large mass comparator according to claim 1, characterized in that: A lifting concave spherical saddle (3221) is fixedly installed in the top plate sinking barrel (322) of the servo electric cylinder top plate (321); the pull rod spherical lifting head (51) is in a spherical shape that matches the lifting concave spherical saddle (3221), and the pull rod spherical lifting head (51) can be pressed on the lifting concave spherical saddle (3221); the lifting concave spherical saddle (3221) is located below the clutch assembly saddle (61), and the clutch assembly saddle (61) is located in the top plate sinking barrel (322) set on the servo electric cylinder top plate (321) and does not contact it. A through hole for penetrating the pull rod (5) is set in the middle of the lifting concave spherical saddle (3221).

4. The suspended large mass comparator according to claim 1, characterized in that: A cover plate concave spherical saddle (221) is fixedly mounted on the sensor cover plate (22); the connecting rod spherical pull head (41) is in a spherical shape that matches the cover plate concave spherical saddle (221), and the connecting rod spherical pull head (41) can be pressed onto the cover plate concave spherical saddle (221); the connecting rod (4) and the clutch assembly saddle (61) are detachably fixedly connected via threads, and a through hole for penetrating the connecting rod (4) is provided in the middle of the cover plate concave spherical saddle (221).

5. The suspended large mass comparator according to claim 1, characterized in that: A guide positioning seat (7) is fixedly installed at the center of the cylinder bottom plate (13), and a tapered hole is opened in the guide positioning seat (7). A guide positioning block (52) is fixedly installed on the pull rod (5) at a position above the hanging ring (53) and is adapted to the tapered hole of the guide positioning seat (7) and can be embedded in the tapered hole.

6. The suspended large mass comparator according to claim 1, characterized in that: Three sensors (2) are arranged at equal intervals on the sensor support plate (21) along the circumferential direction, and three servo electric cylinders (3) are arranged at equal intervals on the cylinder bottom plate (13) along the circumferential direction. The three servo electric cylinders (3) and the three sensors (2) are arranged alternately; the central angle between adjacent servo electric cylinders (3) and sensors (2) is 60°, and the central angle between adjacent sensors (2) and sensors (2) is 120°; the shape of the servo electric cylinder top plate (321) and the sensor cover plate (22) is a triangular star design, and the shape of the sensor support plate (21) is a circular ring design, which can reduce its weight to achieve the weight reduction of the entire equipment and facilitate carrying to the site for work, and is convenient for installation and maintenance of each component.

7. The suspended large mass comparator according to claim 1, characterized in that: Each of the servo electric cylinders (3) is equipped with a power unit (33) for driving a lead screw (32) of the servo electric cylinder (3).

8. The suspended large mass comparator according to claim 3, characterized in that: A display instrument (82) connected to the sensor (2) and a PLC controller (81) connected to the power unit (33) are fixedly mounted on the cylinder (1).

9. The suspended large mass comparator according to claim 1, characterized in that: A reinforcement ring (96) is welded to the outer edge of the top of the cylinder (1), and three hanging rings (93) are installed at equal intervals on the reinforcement ring (96). Three evenly arranged handles (94) are installed on the outside of the cylinder (1), and the three handles (94) correspond to the three hanging rings (93) one by one and are connected.

10. The suspended large mass comparator according to claim 9, characterized in that: The three hanging rings (93) on the cylinder (1) are connected to a three-claw sling, and the three-claw sling comprises a rotating hanging ring (97), a hanging ring seat (91) and a closed flower basket (92). The rotating hanging ring (97) is installed on the hanging ring seat (91). Three evenly arranged positioning pins (95) are installed on the hanging ring seat (91). There are three closed flower baskets (92) in total, and the length of the closed flower basket (92) can be adjusted. The upper end of the closed flower basket (92) is connected to the positioning pin (95) on the hanging ring seat (91), and the lower end is connected to the hanging ring (93) on the reinforcement ring (96).

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