Rock core clamping device for rock core monitoring

Abstract

The invention discloses a rock core clamping device for rock core monitoring, and relates to the technical field of rock core monitoring. The device comprises a rotary clamping disc, a clamping assembly, an injection detection pool and an adjustment limiting system. The flow meter and the weighing assembly are combined to realize accurate measurement of the pore volume of the rock core, the sealing washer and the counterweight pressure block are adopted to improve the sealing performance, the centrifugal force is utilized to enhance the water permeation efficiency, and adaptive adjustment is realized through dynamic adjustment. The device is convenient to operate, accurate in measurement and good in sealing performance, solves the problems of insufficient sealing performance, low detection precision, complex operation and the like in the prior art, and is widely applied to accurate monitoring of the pore volume of the rock core and related experimental research.

Description

Technical Field

[0001] The invention relates to the technical field of core monitoring, and in particular to a core clamping device for core monitoring. Background Art

[0002] In the prior art, there are many deficiencies in the core installation and clamping process. Traditional clamping devices usually achieve the stability of the core through simple fixing grooves or buckles, but during the experiment, especially in dynamic tests, the core is prone to displacement or loosening, affecting the accuracy of the experimental results. In addition, the existing clamping devices have cumbersome steps when installing and removing the core, which can easily cause sample damage, especially when dealing with fragile or porous core columns, the operating error rate is high. Some devices also lack effective sealing measures, resulting in leakage during water injection or testing, which not only affects the measurement accuracy, but may also damage the internal components of the equipment. These problems severely limit the application of prior art in high-precision core pore measurement. Summary of the invention

[0003] In order to overcome the defects of the above-mentioned prior art, the present invention provides the following technical solutions: a core clamping device for core monitoring, comprising a rotating clamping disk, on which a plurality of clamping assemblies arranged in a circular equidistant array are fixedly mounted, the clamping assembly comprising a clamping cylinder fixed to the rotating clamping disk, one end of the clamping cylinder being fixedly sealed with a limiting sealing cover in a manner that is easy to disassemble, a surface of the limiting sealing cover located on the inner side of the clamping cylinder being provided with a plurality of supporting ribs, the supporting ribs being in contact and matching with the core column in the clamping cylinder, and each supporting rib being provided with a through hole; a sealing cover plate being provided for contact and sealing at the other end of the clamping cylinder, two positioning pins being fixed on the sealing cover plate, a positioning hole into which the positioning pins can be inserted being provided on the outer shell of the clamping cylinder, a measuring slide bar being provided for sliding sealing at the center position of the sealing cover plate, a contact disc being fixed at one end of the measuring slide bar located inside the clamping cylinder for contact and matching with the core column, a reset spring being fixed between one end of the measuring slide bar located outside the clamping cylinder and the sealing cover plate, and the reset spring being arranged around the measuring slide bar.

[0004] Preferably, drainage metering cylinder brackets corresponding to the positions of the clamping components and having the same number are fixedly installed at the edge position of the lower surface of the rotating clamping disk, and a weighing component is provided on each drainage metering cylinder bracket, on which a drainage metering cylinder is fixed, and an electromagnetic valve is provided at the bottom end of the drainage metering cylinder, wherein the weighing component is used to detect the weight of the drainage metering cylinder.

[0005] Preferably, the top of the limiting sealing cover is fixedly connected to a drainage hard tube, the drainage hard tube is connected to the top of the inside of the clamping cylinder, and the bottom of the sealing cover plate is fixedly connected to a hose; wherein the side of the sealing cover plate is fixedly or contacted with a counterweight pressure block, wherein a slide rail is provided at a position on the upper surface of the weighing assembly corresponding to the counterweight pressure block, and the slide rail is slidably matched with the counterweight pressure block, wherein the slide rail is arranged radially along the upper surface of the rotating clamping disk.

[0006] Preferably, an injection detection tank is fixed at the center position of the circle on the upper surface of the rotating clamping disk, a driving centrifugal disk is rotatably installed at the bottom of the inner wall of the injection detection tank, a partition plate is buckled on the driving centrifugal disk, a circular hole is provided in the middle of the partition plate, the partition plate is fixedly matched with the inner wall of the driving centrifugal disk, and the bottom of the injection detection tank is also provided with drainage holes with the same number as the clamping assembly, each drainage hole is connected to a corresponding hose, and a flow meter is arranged in series in the hose.

[0007] Preferably, a driving gear ring concentrically arranged with the rotating clamping disk is fixedly mounted on the lower surface of the rotating clamping disk, and the driving gear ring is rotatably mounted on the supporting cylinder, the supporting cylinder is fixed on the supporting frame, and the supporting frame is fixed on the supporting chassis.

[0008] Preferably, a central gear is rotatably mounted at the center of the lower surface of the rotating clamping disk, the central gear and the driving centrifugal disk are coaxially fixed together through a transmission connecting shaft, the central gear and the driving gear ring are meshed and driven through three planetary gears, all the planetary gears are rotatably mounted on the planetary gear mounting disk, and the planetary gear mounting disk is rotatably matched with the inner wall of the supporting cylindrical barrel.

[0009] Preferably, an adjustment limit gear ring is coaxially fixed on the planetary gear mounting plate, and an adjustment limit gear is meshed with the adjustment limit gear ring, wherein a gear connecting groove is also opened on the supporting cylindrical tube, and the adjustment limit gear passes through the gear connecting groove and meshes with the adjustment limit gear ring inside the supporting cylindrical tube for transmission.

[0010] Preferably, an adjustment and limiting motor and a driving motor are fixed on the support frame, wherein the output shaft of the driving motor is fixedly connected to the transmission connecting shaft or the central gear; the output shaft of the adjustment and limiting motor is fixedly connected to the adjustment and limiting gear.

[0011] Compared with the prior art, the present invention has the following beneficial effects: (1) The present invention adopts a combined design of a clamping tube and a limiting sealing cover, achieves precise alignment through positioning pins, and uses supporting ribs to fix the core column to ensure the stability of the core inside the device; (2) The separate design of the sealing cover plate and the clamping tube of the present invention, coupled with the convenient insertion method of the positioning pin, makes the installation and removal process of the core column more efficient, especially in experiments that require frequent replacement of core samples, which can significantly save operation time and improve experimental efficiency; (3) A sealing gasket is arranged between the clamping tube and the sealing cover plate of the present invention, and a counterweight pressure block is arranged on the side of the sealing cover plate, which further enhances the sealing effect through the action of centrifugal force, effectively prevents water leakage, and provides a guarantee for measurement accuracy. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 It is a schematic diagram of the overall structure of the present invention.

[0013] Figure 2 For the present invention Figure 1 Schematic diagram of the structure at point A in the middle.

[0014] Figure 3 It is a structural schematic diagram of the support frame of the present invention.

[0015] Figure 4 This is a schematic diagram of the structure of the injection detection pool of the present invention.

[0016] Figure 5 It is a structural schematic diagram of the slide rail of the present invention.

[0017] Figure 6 It is a schematic diagram of the internal structure of the clamping tube of the present invention.

[0018] Figure 7 For the present invention Figure 6 Schematic diagram of the structure at point B in the middle.

[0019] Figure 8 This is a schematic diagram of the structure of the adjustment and limiting gear ring of the present invention.

[0020] In the figure: 101-rotating clamping plate; 102-injection detection pool; 103-flow meter; 104-weight pressure block; 105-clamping cylinder; 106-slide rail; 107-limiting sealing cover; 108-drainage hard pipe; 109-drainage quantitative cylinder; 110-weighing assembly; 111-electromagnetic valve; 112-drainage quantitative cylinder bracket; 113-support rib; 114-core column; 115-measuring slide rod; 116-sealing cover plate; 117-positioning pin; 118-hose ;119-contact disc;120-reset spring;121-driving centrifugal disc;122-partition plate;123-transmission connecting shaft;124-supporting cylindrical tube;125-planetary gear mounting disc;126-driving gear ring;127-planetary gear;128-adjusting limiting gear;129-adjusting limiting motor;130-driving motor;131-adjusting limiting gear ring;132-gear connecting groove;133-center gear;134-support frame;135-support chassis. DETAILED DESCRIPTION

[0021] The following is combined with Figure 1-Figure 8 , and further illustrate the technical solution of the present invention through specific implementation methods.

[0022] The present invention provides a core clamping device for core monitoring, comprising a rotating clamping disk 101, on which a plurality of clamping assemblies arranged in a circular equidistant array are fixedly mounted, the clamping assembly comprising a clamping cylinder 105 fixed to the rotating clamping disk 101, one end of the clamping cylinder 105 being fixedly sealed with a limiting sealing cover 107 in a manner that is easy to disassemble, a surface of the limiting sealing cover 107 located on the inner side of the clamping cylinder 105 being provided with a plurality of supporting ribs 113, the supporting ribs 113 being in contact with and matching with a core column 114 in the clamping cylinder 105, and each supporting rib 113 being provided with a through hole; the clamping cylinder 105 The other end of 05 is contact-sealed with a sealing cover plate 116, on which two positioning pins 117 are fixed, and the outer shell of the clamping tube 105 is provided with a positioning hole into which the positioning pin 117 can be inserted, and the sealing cover plate 116 is slidingly sealed at the center position of the circle with a measuring slide bar 115, and one end of the measuring slide bar 115 located inside the clamping tube 105 is fixed with a contact disc 119 that contacts and cooperates with the core column 114, and a reset spring 120 is fixed between one end of the measuring slide bar 115 located outside the clamping tube 105 and the sealing cover plate 116, and the reset spring 120 is arranged around the measuring slide bar 115.

[0023] The edge position of the lower surface of the rotating clamping disk 101 is fixedly installed with drainage quantitative cylinder brackets 112 corresponding to the position of the clamping assembly and the same number, and each drainage quantitative cylinder bracket 112 is provided with a weighing assembly 110, and a drainage quantitative cylinder 109 is fixed on the weighing assembly 110, and a solenoid valve 111 is provided at the bottom of the drainage quantitative cylinder 109, wherein the weighing assembly 110 is used to detect the weight of the drainage quantitative cylinder 109. The top of the limiting sealing cover 107 is fixedly connected with a drainage hard pipe 108, and the drainage hard pipe 108 is connected with the top of the inside of the clamping cylinder 105, and the bottom of the sealing cover plate 116 is fixedly connected with a hose 118; wherein the side of the sealing cover plate 116 is fixedly or contacted with a counterweight pressure block 104, wherein the upper surface of the weighing assembly 110 is provided with a slide rail 106 at a position corresponding to the counterweight pressure block 104, and the slide rail 106 is slidably matched with the counterweight pressure block 104, wherein the slide rail 106 is arranged along the radial direction of the upper surface of the rotating clamping disk 101. An injection detection tank 102 is fixed at the center position of the upper surface of the rotating clamping disk 101, and a driving centrifugal disk 121 is rotatably installed at the bottom of the inner wall of the injection detection tank 102. A partition plate 122 is buckled on the driving centrifugal disk 121, and a circular hole is provided in the middle of the partition plate 122. The partition plate 122 is fixedly matched with the inner wall of the driving centrifugal disk 121. The bottom of the injection detection tank 102 is also provided with drainage holes with the same number as the clamping assembly, each drainage hole is connected to the corresponding hose 118, and a flow meter 103 is arranged in series in the hose 118.

[0024] A driving gear ring 126 is fixedly mounted on the lower surface of the rotating clamping disk 101 and is arranged concentrically with the rotating clamping disk 101. The driving gear ring 126 is rotatably mounted on the supporting cylindrical barrel 124. The supporting cylindrical barrel 124 is fixed on the supporting frame 134. The supporting frame 134 is fixed on the supporting chassis 135. A central gear 133 is rotatably mounted at the center of the circle on the lower surface of the rotating clamping disk 101. The central gear 133 is coaxially fixedly matched with the driving centrifugal disk 121 through the transmission connecting shaft 123. The central gear 133 and the driving gear ring 126 are meshed and driven through three planetary gears 127. All the planetary gears 127 are rotatably mounted on the planetary gear mounting disk 125. The planetary gear mounting disk 125 is rotatably matched with the inner wall of the supporting cylindrical barrel 124. An adjustment and limiting gear ring 131 is coaxially fixed on the planetary gear mounting plate 125, and an adjustment and limiting gear 128 is meshed with the adjustment and limiting gear ring 131, wherein a gear connecting groove 132 is also provided on the support cylinder 124, and the adjustment and limiting gear 128 passes through the gear connecting groove 132 and meshes with the adjustment and limiting gear ring 131 inside the support cylinder 124. An adjustment and limiting motor 129 and a driving motor 130 are fixed on the support frame 134, wherein the output shaft of the driving motor 130 is fixedly connected to the transmission connecting shaft 123 or the central gear 133; and the output shaft of the adjustment and limiting motor 129 is fixedly connected to the adjustment and limiting gear 128.

[0025] Separate the sealing cover plate 116 from the clamping tube 105, and then insert the core column 114 into the clamping tube 105 (cut the core column 114 so that the two end surfaces of the core column 114 are as flat as possible, and cut the core column 114 into a cylindrical shape, generally using a hole opener, the inner diameter of the hole opener is the outer diameter of the core column 114, so that the outer diameter of the core column 114 is compatible with the inner diameter of the clamping tube 105), let one end of the core column 114 contact the supporting rib 113, and then Then, the sealing cover plate 116 is buckled on the clamping tube 105 so that the positioning pin 117 is aligned with the positioning hole of the clamping tube 105 and inserted. At this time, the contact disc 119 will contact the end surface of the core column 114. As the sealing cover plate 116 continues to approach the clamping tube 105, the measuring slide bar 115 will slide relative to the sealing cover plate 116. During this process, the measuring slide bar 115 is actually stationary, and only the sealing cover plate 116 is moving. Then, the reset tension spring 120 will be stretched and deformed, and the return spring 120 will be deformed. The deformation of the reset spring 120 can be known by measuring the inductance of the reset spring 120 itself (the inductance of the reset spring 120 is related to its own density, and the greater the density, the lower the deformation; when the reset spring 120 is stretched, the inductance will decrease, because the distance between the coils increases, the number of coil turns per unit length decreases, the magnetic flux decreases, and the inductance decreases; conversely, when the reset spring 120 is compressed, the inductance will increase, because when the coils are denser, there are more coil turns per unit length, the magnetic flux increases, and the inductance increases. Therefore, the density here refers to the distance between the coils, which directly affects the inductance; specifically, the relationship between the deformation of the reset spring 120 and the inductance can be predicted, and a relationship curve between the deformation of the reset spring 120 and the inductance can be recorded and generated), and then the gap between the contact disc 119 and the sealing cover plate 116 can be known (since the diameter is known, the volume of the gap is known). It should be noted that the core column 114 (or other objects of equal mass) needs to be placed in all the clamping assemblies.

[0026] After water is injected into the detection pool 102, the drive motor 130 and the regulating and limiting motor 129 can be started. The regulating and limiting motor 129 is used as an auxiliary. The output shaft of the drive motor 130 drives the central gear 133 to rotate. The central gear 133 drives the driving centrifugal disk 121 to rotate through the transmission connecting shaft 123. The driving centrifugal disk 121 rotates, which causes the water injected into the detection pool 102 to rotate. The water rotates and is subjected to centrifugal force to flow toward the inner wall edge of the injection detection pool 102, and then enters the hose 118. The hose 118 is connected to the hose 118. 8. The water is guided into the clamping tube 105, and then into the pores inside the core column 114 (gradually flowing from the bottom of the clamping tube 105 to the top). When the water fills the pores in the core column 114, it will flow into the drainage tube 108 (during this process, the support ribs 113 will also be filled with water. The volume of this part of water is known. Adding the volume of water between the sealing cover plate 116 and the core column 114, plus the volume of the core column 114 set in the clamping tube 105, it is equal to the volume inside the clamping tube 105). The drainage tube 108 drains the water into the drainage metering tube 109 (the drainage tube 108 is inserted deep into the drainage metering tube 109 to prevent the water from being thrown out). Since the density of water is known, the weight of the water inside the drainage metering tube 109 can be measured by the weighing assembly 110 to know the volume of water (during this process, the rotating clamping disk 101 is in a stationary state). Therefore, the flow meter 103 can measure the volume of water entering the clamping tube 105, and the volume of water discharged from the clamping tube 105 can be measured through the weighing assembly 110. The difference between these two volumes is the volume of water remaining in the clamping tube 105, that is, the volume of the pores inside the core column 114 (this part needs to deduct the volume of water filled at the supporting rib 113 and the volume of water between the sealing cover plate 116 and the core column 114).

[0027] The rotation of the rotating clamping disk 101 is driven by the rotation of the driving gear ring 126, and the driving gear ring 126 needs to be driven by the planetary gear 127. Therefore, the central gear 133 drives the driving gear ring 126 to rotate through the planetary gear 127, and the driving gear ring 126 will drive the rotating clamping disk 101 to rotate, thereby driving the clamping assembly to rotate. The premise of the rotation of the driving gear ring 126 is that the revolution of the planetary gear 127 is restricted. Therefore, the rotation of the planetary gear mounting disk 125 needs to be restricted. Similarly, the rotation of the adjustment and restriction gear ring 131 fixed to the planetary gear mounting disk 125 needs to be restricted. At this time, the output shaft of the adjustment and restriction motor 129 drives the adjustment and restriction gear 128 meshing with the adjustment and restriction gear ring 131 to limit the rotation of the adjustment and restriction gear ring 131, and the speed and rotation direction of the adjustment and restriction gear 128 and the adjustment and restriction gear ring 131 are controlled by the adjustment and restriction motor 129 to control the transmission ratio between the central gear 133 and the driving gear ring 126, thereby controlling the rotation speed of the rotating clamping disk 101. Therefore, when the clamping assembly rotates, all the substances inside, especially water, will rotate with it, and thus can more easily penetrate into the pores under the action of centrifugal force. A sealing gasket is arranged between the clamping cylinder 105 and the sealing cover plate 116 to improve its sealing performance, and the counterweight pressure block 104 is also subjected to centrifugal force during the rotation process, and this part of the centrifugal force will be applied to the sealing cover plate 116, thereby increasing the positive pressure between the sealing cover plate 116 and the clamping cylinder 105, and thus improving the sealing performance between the two.

[0028] Finally, the electromagnetic valve 111 is opened to drain the water inside the drainage metering cylinder 109. In order to ensure the detection accuracy, the air inside the clamping cylinder 105 and the core column 114 can be discharged by injecting water before the formal detection, and then the detection is carried out. At this time, the discharged water is not counted (it needs to be subtracted when weighing the drainage metering cylinder 109).

Claims

1. A core clamping device for core monitoring, characterized in that: The invention comprises a rotating clamping disk (101), on which a plurality of clamping assemblies arranged in a circular equidistant array are fixedly mounted, the clamping assembly comprising a clamping cylinder (105) fixed to the rotating clamping disk (101), one end of the clamping cylinder (105) being fixedly sealed with a limiting sealing cover (107) in a manner that is easy to disassemble, a surface of the limiting sealing cover (107) located on the inner side of the clamping cylinder (105) being provided with a plurality of supporting ribs (113), the supporting ribs (113) being in contact with and matching with a core column (114) in the clamping cylinder (105), and each supporting rib (113) being provided with a through hole; The other end of the clamping tube (105) is provided with a sealing cover plate (116) in contact and sealing, and two positioning pins (117) are fixed on the sealing cover plate (116). The outer shell of the clamping tube (105) is provided with a positioning hole into which the positioning pins (117) can be inserted. The sealing cover plate (116) is provided with a measuring slide rod (115) in a sliding seal at the center position of the circle. A contact disc (119) that contacts and cooperates with the core column (114) is fixed at one end of the measuring slide rod (115) located inside the clamping tube (105). A reset spring (120) is fixed between one end of the measuring slide rod (115) located outside the clamping tube (105) and the sealing cover plate (116). The reset spring (120) is arranged around the measuring slide rod (115).

2. A core clamping device for core monitoring according to claim 1, characterized in that: Drainage metering cylinder brackets (112) having the same number as the positions of the clamping components are fixedly mounted on the edge of the lower surface of the rotating clamping disk (101), each drainage metering cylinder bracket (112) is provided with a weighing component (110), a drainage metering cylinder (109) is fixed on the weighing component (110), and a solenoid valve (111) is provided at the bottom end of the drainage metering cylinder (109), wherein the weighing component (110) is used to detect the weight of the drainage metering cylinder (109).

3. A core clamping device for core monitoring according to claim 2, characterized in that: The top of the limiting sealing cover (107) is fixedly connected to a drainage hard tube (108), and the drainage hard tube (108) is connected to the top of the inside of the clamping tube (105), and the bottom of the sealing cover plate (116) is fixedly connected to a hose (118); wherein a counterweight pressure block (104) is fixedly or contacted to the side of the sealing cover plate (116), wherein a slide rail (106) is provided at a position on the upper surface of the weighing component (110) corresponding to the counterweight pressure block (104), and the slide rail (106) is slidably matched with the counterweight pressure block (104), wherein the slide rail (106) is arranged radially along the upper surface of the rotating clamping disk (101).

4. A core clamping device for core monitoring according to claim 3, characterized in that: An injection detection pool (102) is fixed at the center position of the upper surface of the rotating clamping disk (101); a driving centrifugal disk (121) is rotatably mounted at the bottom of the inner wall of the injection detection pool (102); a partition plate (122) is buckled on the driving centrifugal disk (121); a circular hole is provided in the middle of the partition plate (122); the partition plate (122) is fixedly matched with the inner wall of the driving centrifugal disk (121); the bottom of the injection detection pool (102) is also provided with the same number of drainage through holes as the clamping assembly; each drainage through hole is connected to a corresponding hose (118), and a flow meter (103) is provided in series in the hose (118).

5. A core clamping device for core monitoring according to claim 4, characterized in that: A driving gear ring (126) is fixedly mounted on the lower surface of the rotating clamping disk (101) and is arranged concentrically with the rotating clamping disk (101). The driving gear ring (126) is rotatably mounted on a supporting cylindrical tube (124). The supporting cylindrical tube (124) is fixed on a supporting frame (134), and the supporting frame (134) is fixed on a supporting chassis (135).

6. A core clamping device for core monitoring according to claim 5, characterized in that: A central gear (133) is rotatably mounted at the center of the lower surface of the rotating clamping disk (101); the central gear (133) and the driving centrifugal disk (121) are coaxially fixedly matched via a transmission connecting shaft (123); the central gear (133) and the driving gear ring (126) are meshed and driven via three planetary gears (127); all the planetary gears (127) are rotatably mounted on a planetary gear mounting disk (125); and the planetary gear mounting disk (125) is rotatably matched with the inner wall of the supporting cylindrical barrel (124).

7. A core clamping device for core monitoring according to claim 6, characterized in that: An adjusting and limiting gear ring (131) is coaxially fixed to the planetary gear mounting plate (125), and an adjusting and limiting gear ring (131) is meshed with an adjusting and limiting gear (128). A gear connecting groove (132) is also provided on the supporting cylindrical tube (124), and the adjusting and limiting gear (128) passes through the gear connecting groove (132) and meshes with the adjusting and limiting gear ring (131) inside the supporting cylindrical tube (124) for transmission.

8. A core clamping device for core monitoring according to claim 7, characterized in that: An adjusting and limiting motor (129) and a driving motor (130) are fixed on the supporting frame (134), wherein an output shaft of the driving motor (130) is fixedly connected to the transmission connecting shaft (123) or the central gear (133); and an output shaft of the adjusting and limiting motor (129) is fixedly connected to the adjusting and limiting gear (128).

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