A filter bag radial strength detection device

Abstract

The utility model relates to filter bag detection technical field especially, it relates to a kind of filter bag radial strength detection device, the utility model includes the upper plate being installed on the top of base, to constitute main frame, the lower portion of upper plate is equipped with radial expansion component, the upper portion of radial expansion component is provided with cylinder as power source, digital pressure sensor is fixedly installed on cylinder, it is used for real-time detection and display cylinder pressure data, radial expansion component includes the top plate of several annular array settings, filter bag is set in the outside of several top plates, cylinder drives several top plates synchronous expansion outward, the radial strength detection of filter bag is carried out by it, top plate applies extrusion pressure from filter bag interior outward, since multiple top plates are annular array and synchronous motion, can form uniform, multidirectional radial stress to filter bag bag mouth, avoid the stress concentration caused by single point or unidirectional stress, to improve the accuracy and reliability of detection data.

Description

Technical Field

[0001] This utility model relates to the field of filter bag testing technology, and in particular to a filter bag radial strength testing device. Background Technology

[0002] As a filtration element, the filter bag is a crucial component in the filtration process, and its quality largely determines the filtration effect. Therefore, its radial strength needs to be accurately tested before it leaves the factory.

[0003] Currently, most common testing devices simulate the working stress of a filter bag by expanding it from the inside out. Existing devices typically use simple linkage expansion mechanisms for this simulation. However, due to the lack of effective motion trajectory constraints between components, it's difficult for the expansion arms to maintain synchronization and concentricity during outward movement. This results in uneven stress distribution at the filter bag opening during testing, with obvious localized stress concentration points. The filter bag material at these points will reach its strength limit first due to excessive stretching and fail. The destructive force recorded by the testing system at this point is not the true radial strength limit that the entire filter bag opening can withstand under uniform stress, but merely the destructive force value at its weakest point. This ultimately leads to test results that are significantly lower than the product's actual performance, failing to provide accurate and reliable data support for quality assessment and product design. Utility Model Content

[0004] The purpose of this invention is to provide a device for detecting the radial strength of filter bags, so as to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, the present invention adopts the following technical solution:

[0006] A radial strength detection device for a filter bag includes an upper plate mounted on a base, a radial expansion assembly mounted below the upper plate, a cylinder mounted above the radial expansion assembly, and a digital pressure sensor fixedly mounted on the cylinder. The digital pressure sensor detects and displays the pressure data of the cylinder. The radial expansion assembly includes several top plates arranged in a ring array. The filter bag is fitted over the outside of the top plates. The cylinder drives the top plates to expand outward synchronously, squeezing the bag opening from the inside. The digital pressure sensor enables the cylinder to display the detected strength value.

[0007] Preferably, a disc is fixedly installed below the upper plate, and the disc guides and constrains the sliding direction of several top plates.

[0008] Preferably, a number of guide grooves are provided on the bottom of the disc in a radial pattern, and a slider is fixedly connected to the top of the top plate. The slider slides in the guide grooves, causing the top plates to expand outward radially.

[0009] Preferably, a central column is provided below the center of the disc, and the piston rod of the cylinder passes through the upper plate and the disc and connects to the top of the central column. The cylinder drives the central column to slide up and down through the piston rod and controls several top plates to expand or contract outward.

[0010] Preferably, the side wall of the central column is provided with several square grooves corresponding to the top plate. The two ends of the square grooves are hinged with hinge rods, and the other end of the hinge rods is hinged to the top plate near its end. The cylinder drives the central column to slide upward through the piston rod and pulls the top plate through the hinge rods.

[0011] Preferably, a pressure strip is provided on the side of the top plate away from the central column. The pressure strip is hinged to the side wall of the top plate, and torsion springs are provided on both sides of the hinge point. The torsion springs continuously apply torque to the pressure strip, so that the bottom of the pressure strip continuously presses against the side wall of the top plate.

[0012] Compared with the prior art, the advantages of this utility model are as follows:

[0013] 1. The square groove on the side wall of the central column and the hinge rod form a motion conversion mechanism, which converts the vertical drive of the cylinder into the horizontal radial movement of the top plate. At the same time, the radial motion guide mechanism is formed by the radial guide groove on the disc and the slider on the top of the top plate. The two mechanisms work together to force all the top plates to follow the preset radial straight trajectory and keep synchronous during expansion, which ensures the concentricity of the expansion body. This allows the filter bag opening to withstand uniform circumferential stress and improves the accuracy of the test data.

[0014] 2. A flexible bag mouth clamping mechanism is formed by the pressure strip and torsion spring set on the outside of the top plate. This mechanism can quickly and initially fix the bag mouth of the filter bag before the test begins, avoiding accidental loosening of the bag mouth during clamping and expansion, thereby improving the preparation efficiency and reliability of the test operation. Attached Figure Description

[0015] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, for those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0016] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0017] Figure 2 This is one of the partial structural diagrams of the overall structure of this utility model;

[0018] Figure 3 This is the second partial structural diagram of the overall structure of this utility model;

[0019] Figure 4 This is a schematic diagram of the radial expansion component structure of this utility model.

[0020] The attached figures are labeled as follows:

[0021] 1. Radial expansion assembly; 11. Central column; 12. Top plate; 13. Hinge rod; 14. Square groove; 15. Pressure strip; 16. Torsion spring; 17. Slider;

[0022] 2. Cylinder; 3. Disc; 31. Guide groove; 4. Upper plate; 5. Base; 6. Digital display pressure sensor. Detailed Implementation

[0023] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention.

[0024] A device for detecting the radial strength of a filter bag, such as Figures 1-4 As shown, the system includes an upper plate 4 mounted above the base 5 to form the main frame. A radial expansion assembly 1 is mounted below the upper plate 4, and a cylinder 2, serving as the power source, is positioned above the radial expansion assembly 1. The specific model of cylinder 2 is SMC CY1S32-50-M5. A digital display pressure sensor 6, specifically model PN7095, is fixedly mounted on cylinder 2. This sensor is used to detect and display the pressure data generated by cylinder 2 during its operation in real time. (When cylinder 2 pulls the radial expansion assembly 1 and expands the filter bag outwards, the radial reaction force generated by the filter bag on the top plate 12 is ultimately transmitted to the piston rod of cylinder 2. This means that cylinder 2 needs to output a larger contraction force to maintain the expansion. This increased contraction force is captured in real time by the digital display pressure sensor 6 and displayed as a continuously rising pressure reading. The maximum pressure value displayed by the digital display pressure sensor 6 at the moment the filter bag is about to burst is the radial strength limit of the filter bag.) The radial expansion assembly 1 includes several annular arrays. The filter bag is fitted over several top plates 12 arranged in a row. The cylinder 2 drives the top plates 12 to expand outward synchronously, squeezing the bag opening from the inside to test the radial strength of the bag opening. The top plates 12 apply pressure from the inside of the filter bag to the outside. Since the multiple top plates 12 are arranged in a ring array and move synchronously, they can form uniform and multi-directional radial stress on the bag opening, avoiding stress concentration caused by single-point or unidirectional force. This more accurately reflects the overall radial strength of the filter bag and improves the accuracy and reliability of the test data. During this process, the contraction force output by the cylinder 2 is monitored in real time and directly displayed by the digital pressure sensor 6. This contraction force value corresponds to the radial strength that the filter bag can withstand, which is convenient for the tester to record.

[0025] A disc 3 is fixedly installed below the upper plate 4. The disc 3 provides precise sliding path guidance and motion constraint for the multiple top plates 12 arranged in a ring array. Without the guidance constraint of the disc 3, the multiple top plates 12 cannot guarantee synchronization when expanding outward. The guide groove 31 forces all top plates 12 to follow the same predetermined path, ensuring that they expand outward synchronously from the center, forming a stable and concentric expansion body. This allows them to uniformly squeeze the bag opening of the filter bag from the inside, avoiding the problem of local stress concentration of the filter bag or insufficient stretching of some areas due to uneven force. As a result, the final test data can truly reflect the overall radial strength of the filter bag, significantly improving the accuracy and reliability of the test.

[0026] Several guide grooves 31 are radially distributed at the bottom of the disc 3. Each top plate 12 is fixedly connected to a slider 17. The slider 17 is embedded in the corresponding guide groove 31 and can slide along it. When the top plate 12 is driven, the slider 17 is forced to move along the radial guide groove 31, thereby driving the top plate 12 to make radial linear motion, forcing several top plates 12 to expand outward in a synchronous circumferential radial direction. This mechanism ensures that the trajectory of the expansion motion always points to the center of the circumference, so as to evenly squeeze the bag opening from the inside of the filter bag. In addition, the guide groove 31 also suspends the entire top plate 12 assembly below the disc 3 by supporting the slider 17. This suspension design leaves enough unobstructed operating space below the top plate 12 assembly, making it convenient for the testing personnel to easily put the filter bag on the outside of the top plate 12 from top to bottom.

[0027] A central column 11 is set below the center of the disc 3. The piston rod of the cylinder 2 passes through the upper plate 4 and the disc 3 and is connected to the top of the central column 11. The cylinder 2 directly drives the central column 11 to slide up and down in the vertical direction through the extension and retraction of its piston rod. The up and down movement of the central column 11 is ultimately converted into the action of controlling several surrounding top plates 12 to expand outward or contract inward synchronously through the action of other components.

[0028] The side wall of the central column 11 has several square grooves 14 corresponding to the top plate 12. The two ends of the square grooves 14 are hinged to hinge rods 13. The other end of the hinge rods 13 is hinged to the top plate 12 near its end. When the cylinder 2 drives the central column 11 to slide upward through the piston rod, the central column 11 will apply an upward contraction force to the top plate 12 through the hinge rods 13. Since the top of the top plate 12 is restricted in the radial guide groove 31 of the disc 3 through the slider 17 on it, the top plate 12 cannot move upward with the central column 11. This motion constraint forces the contraction force of the hinge rods 13 to be converted into a horizontal component force, pulling the top plate 12 strictly along the trajectory of the guide groove 31 and sliding horizontally away from the axis of the device, thereby realizing a precise radial expansion action, squeezing the filter bag from the inside, and completing the radial strength test.

[0029] A pressure strip 15 is provided on the side of the top plate 12 away from the central column 11. The pressure strip 15 is hinged to the side wall of the top plate 12. Torsion springs 16 are provided on both sides of the hinge point. The torsion springs 16 use their own elastic deformation to continuously apply a torque to the pressure strip 15. This torque forces the bottom of the pressure strip 15 to continuously press against the side wall of the top plate 12, thereby forming an elastic clamping point between the two. When placing the filter bag, the operator can pass the edge of the filter bag opening through the contact point between the pressure strip 15 and the side wall of the top plate 12. With the continuous pressure provided by the torsion spring 16, the pressure strip 15 can initially fix the filter bag opening on the top plate 12. This allows the bag opening to be pre-positioned during the process of placing the filter bag on all the top plates 12, preventing slippage and simplifying the operation. This, combined with the subsequent outward expansion of the top plate 12 to tighten the bag opening, significantly improves the efficiency of the filter bag placement work before testing.

[0030] Furthermore, rubber clamping strips can be staggered on the side of the pressure strip 15 that is close to the top plate 12. The clamping strips are a widely used technical means in this field, and their specific structure and working principle are existing technologies in this field, which will not be described in detail here. The two staggered clamping strips clamp the bag opening of the filter bag from the inside and outside, further preventing the filter bag from sliding during testing, thereby further improving the accuracy of the test results.

[0031] The working principle of the filter bag radial strength testing device provided by this utility model is as follows:

[0032] First, the operator inserts the edge of the filter bag opening into the gap between the pressure strip 15 on the outside of each top plate 12 and the top plate 12. The continuous elastic pressure provided by the torsion spring 16 will clamp the bag opening onto the top plate 12 through the pressure strip 15, realizing the rapid pre-fixation of the filter bag and effectively preventing the bag opening from slipping off in subsequent operations, laying the foundation for efficient testing.

[0033] Then, cylinder 2 is activated, and its piston rod pulls the central column 11 upward. The upward linear movement of the central column 11 is transmitted to multiple top plates 12 through the hinge rod 13 in the square groove 14 on its side wall. At the same time, the slider 17 on the top of each top plate 12 is constrained in the radial guide groove 31 preset on the disc 3, thereby forcing the vertical movement of the central column 11 to be accurately converted into the horizontal expansion movement of the top plate 12 in sync with the radial trajectory. This ensures that the multiple top plates 12 remain concentric during expansion and apply uniform circumferential stress to the bag opening of the filter bag, thus completely avoiding detection errors caused by uneven force.

[0034] As the top plate 12 expands radially, the filter bag opening is gradually tightened until it breaks. During this process, the radial reaction force generated by the filter bag on the top plate 12 is ultimately transmitted to the piston rod of the cylinder 2 through the linkage mechanism. The cylinder 2 needs to output a larger contraction force. This contraction force is detected and displayed directly in real time by the digital display pressure sensor 6 fixed on the cylinder 2. Due to the uniformity and synchronicity of the expansion movement, the maximum pressure value read by the digital display pressure sensor 6 corresponds to the radial strength limit of the filter bag, thereby improving the accuracy of the detection data.

[0035] The above are merely preferred embodiments of this utility model, but the scope of protection of this utility model is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in this utility model, based on the technical solution and inventive concept of this utility model, should be included within the scope of protection of this utility model.

Claims

1. A filter bag radial strength detection device comprising an upper plate (4) mounted above a base (5), characterized in that, A radial expansion assembly (1) is installed below the upper plate (4), and a cylinder (2) is arranged above the radial expansion assembly (1). A digital pressure sensor (6) is fixedly installed on the cylinder (2). The digital pressure sensor (6) detects and displays the pressure data of the cylinder (2). The radial expansion assembly (1) includes several top plates (12) arranged in a ring array. The filter bag is sleeved on the outside of several top plates (12). The cylinder (2) drives several top plates (12) to expand outward synchronously, which squeezes the bag opening of the filter bag from the inside. The cylinder (2) displays the value of the detected intensity through the digital pressure sensor (6).

2. The filter bag radial strength detection device of claim 1, wherein, A disc (3) is fixedly installed below the upper plate (4), and the disc (3) guides and constrains the sliding direction of several top plates (12).

3. The filter bag radial strength detection apparatus of claim 2, wherein, Several guide grooves (31) are provided on the bottom of the disc (3) in a radial pattern. A slider (17) is fixedly connected to the top of the top plate (12). The slider (17) slides in the guide grooves (31) so that the top plates (12) expand outward in the radial direction.

4. The filter bag radial strength detection apparatus according to claim 1, wherein A central column (11) is set below the center of the disc (3). The piston rod of the cylinder (2) passes through the upper plate (4) and the disc (3) and connects to the top of the central column (11). The cylinder (2) drives the central column (11) to slide up and down through the piston rod and controls several top plates (12) to expand or contract outward.

5. The filter bag radial strength detection apparatus according to claim 4, wherein The side wall of the central column (11) has several square grooves (14) corresponding to the top plate (12). The two ends of the square grooves (14) are hinged with hinge rods (13). The other end of the hinge rods (13) is hinged to the top plate (12) near its end. The cylinder (2) drives the central column (11) to slide upward through the piston rod and pulls the top plate (12) through the hinge rods (13).

6. The filter bag radial strength detection apparatus according to claim 4, wherein A pressure strip (15) is provided on the side of the top plate (12) away from the central column (11). The pressure strip (15) is hinged on the side wall of the top plate (12). Torsion springs (16) are provided on both sides of the hinge point. The torsion springs (16) continuously apply torque to the pressure strip (15), so that the bottom of the pressure strip (15) continuously presses the side wall of the top plate (12).

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