A freezing point detection device for detecting the preparation of styrene true inhibitor

Abstract

The present invention belongs to the technical field of liquid freezing point detection equipment, and in particular, relates to a freezing point detection device for detecting the preparation of styrene true polymerization inhibitor, including a detector body, two cold traps are symmetrically provided on the top of the detector body, and a refrigeration box is provided on the inner side of the detector body, an outer test tube is inserted into the cold trap, and an inner test tube is inserted into the inner side of the outer test tube. The present invention is provided with a protective component, and before removing the detection probe, the pull rod can be pulled to drive the stirring ring to move upward into the detection probe, and as the stirring ring enters the detection probe, the rubber sleeve can drive the bottom edge of the rubber sleeve to be close to the inner wall of the side of the detection probe under the joint action of the first support rod and the second support rod, so that the stirring ring and the oil attached to its surface can be isolated in the detection probe by the rubber sleeve, thereby preventing the oil attached to the stirring ring from dripping randomly when the detection probe is removed.

Description

Technical Field

[0001] The invention belongs to the technical field of liquid solidification point detection equipment, and in particular relates to a solidification point detection device for detecting the preparation of styrene true polymerization inhibitor. Background Art

[0002] The pour point is the highest temperature of the oil when the sample oil is placed in a test tube and cooled to the point where the liquid surface does not move under the specified test conditions. The pour point is an indicator for evaluating the low-temperature performance of oil products, and is also an indicator that must be mastered when storing, transporting, receiving and sending oil products.

[0003] The existing solidification point of oil products is generally measured using a solidification point tester. During the test, the oil needs to be added to the inner test tube and the liquid level is flush with the scale line on the inner test tube, then about 1 ml of anhydrous ethanol is added to the outer test tube, and then the inner test tube containing the oil is inserted into the outer test tube, and then the detection rod on the detection probe is inserted into the inner test tube and locked, and then the outer test tube is inserted into the cold trap of the detector for automatic detection. During the detection process, in order to accelerate the solidification of the oil, a stirring ring that can move up and down is generally added to the inner test tube to stir the oil, so that the oil can be cooled more evenly and quickly, thereby improving the detection efficiency of the solidification point of the oil.

[0004] However, due to the lack of appropriate protective devices, after the test is completed, as the stirring ring is taken out from the inner test tube, some of the semi-condensed oil on the stirring ring will drip randomly as the stirring ring is taken out, which requires time to clean up and is very troublesome.

[0005] Therefore, it is necessary to invent a freezing point detection device for detecting the preparation of styrene true polymerization inhibitor to solve the above problems. Summary of the invention

[0006] In view of the above problems, the present invention provides a freezing point detection device for detecting the preparation of styrene true polymerization inhibitor to solve the problems raised in the above background technology.

[0007] To achieve the above object, the present invention provides the following technical solutions:

[0008] A freezing point detection device for detecting the preparation of styrene true polymerization inhibitor, comprising a detector body, two cold traps are symmetrically arranged on the top of the detector body, and a refrigeration box is arranged on the inner side of the detector body, an outer test tube is inserted into the cold trap, an inner test tube is inserted into the inner side of the outer test tube, a limiting ring is arranged near the top of the inner test tube, and the outer diameter of the limiting ring matches the inner diameter of the outer test tube, a supporting ring is arranged at the bottom of the limiting ring, and the supporting ring is fixedly connected to the inner wall of the outer test tube, a cylindrical detection probe is sleeved on the top of the outer test tube, and the bottom axis of the detection probe is vertically A detection rod is installed, and a protective component is sleeved on the detection rod near the top, a data cable is connected between the detection probe and the detection instrument body, a stirring ring is sleeved on the detection rod near the bottom, a pull rod is vertically fixedly connected to the top edge of the stirring ring, a first hole is opened through the top of the detection probe, the pull rod is inserted into the first hole, a driving component is connected between the tops of the two pull rods, a protective cover is fixedly sleeved on the outer test tube near the top, and locking screws are threadedly inserted into the positions on both sides of the detection probe opposite to the protective cover.

[0009] Furthermore, the protection component includes a fixed tube, which is detachably mounted on the inner wall of the top of the detection probe, and the detection rod is located at the inner axis of the fixed tube, and the bottom edge of the fixed tube is fixedly connected with a coaxial and stretchable rubber sleeve, the top diameter of the rubber sleeve is smaller than the bottom diameter thereof, and in an initial state, the bottom diameter of the rubber sleeve is smaller than the inner diameter of the stirring ring, and a plurality of first support rods are evenly distributed on the inner wall of the rubber sleeve, the top of the first support rod is hinged to the bottom edge of the fixed tube, the bottom end of the first support rod is hinged to a second support rod, and the bottom ends of the plurality of second support rods are hinged to the same fixed ring, and the fixed ring is slidably sleeved on the detection rod, The outer diameter of the fixing ring is smaller than the inner diameter of the fixing tube, and a plurality of L-shaped rods are fixedly connected to the top of the fixing ring. A plurality of vertical strip limiting holes are penetrated on the side wall of the fixing tube, and the horizontal sections of the plurality of L-shaped rods are penetrated and inserted in the plurality of strip limiting holes one by one. The ends of the plurality of horizontal sections of the L-shaped rods are fixedly connected with the same annular plate, and the annular plate is slidably sleeved on the fixing tube, a second plug hole is penetrated on the annular plate, and the pull rod is penetrated and inserted in the second plug hole, and the tops of the plurality of horizontal sections of the L-shaped rods are fixedly connected with the same annular support plate, the support plate is located on the inner side of the fixing tube, and a reset spring is fixedly connected between the top of the support plate and the top inner wall of the detection probe.

[0010] Furthermore, the driving assembly includes an electric push rod, which is vertically installed on the top of the detector body and is located on the symmetry plane of the two cold traps. The top of the electric push rod is horizontally rotatably connected to a connecting plate, and the bottom of the connecting plate near both ends is fixedly connected with an arc-shaped slot, and the center of the slot coincides with the axis of the electric push rod. One end of the slot is open, and the two slots are rotationally symmetrical about the electric push rod. An annular groove matching the slot is provided on the side of the pull rod near the top, and the annular groove can be slid into the slot through the opening of the slot.

[0011] Furthermore, a spherical block is fixedly sleeved at a position near the bottom end of the pull rod, and the diameter of the spherical block is smaller than the inner diameters of the first socket and the second socket, an annular rubber ring is fixedly connected to the inner wall of the first socket, the inner diameter of the rubber ring is smaller than the diameter of the spherical block, and an arc-shaped limit groove matching the spherical block is provided on the inner wall of the rubber ring, the friction force between the arc-shaped limit groove and the spherical block is greater than the maximum elastic force of the reset spring on the annular plate, and the distance between the spherical block and the stirring ring is smaller than the distance between the top of the annular plate to the inner wall of the bottom of the detection probe in the initial state.

[0012] Furthermore, the tops of the inner test tube and the outer test tube are provided with the same annular rubber protective pad, the bottom of the rubber protective pad is provided with a rubber protective ring, and the rubber protective ring is inserted into the gap between the inner test tube and the outer test tube.

[0013] Furthermore, the inner side of the rubber protective pad is made of hard rubber, and a plurality of bow-shaped spring pieces are fixedly connected to the inner side of the rubber protective pad, the bottom end of the bow-shaped spring piece is located in the inner test tube, and the middle part of the bow-shaped spring piece protrudes toward the direction close to the detection rod, a protrusion is fixedly connected to the middle position of one side of the protruding bow-shaped spring piece, and the top of the protrusion is inclined toward the direction close to the detection rod, the stirring ring is spring-shaped as a whole, and the stirring ring is elastic, an annular protrusion is fixedly connected to the bottom edge of the stirring ring, the bottom edge of the annular protrusion is inclined toward the direction away from the detection rod, and the bottom edge of the annular protrusion can contact the protrusion.

[0014] Furthermore, a rubber convex ring is fixedly connected to the bottom edge of the rubber sleeve, the rubber convex ring is elastic, and the rubber convex ring can fit with the inner wall of the side of the detection probe.

[0015] Furthermore, in the initial state, the distance between the bottom end of the rubber sleeve and the bottom end of the annular plate is greater than the height of the stirring ring, and the outer diameter of the stirring ring is smaller than the inner diameter of the detection probe.

[0016] Technical effects and advantages of the present invention:

[0017] 1. The present invention is provided with a protective component. When the oil product is tested, before removing the detection probe, the pull rod can be pulled to drive the stirring ring to move upward and enter the detection probe. As the stirring ring enters the detection probe, the rubber sleeve can drive the bottom edge of the rubber sleeve to be closely attached to the side inner wall of the detection probe under the joint action of the first support rod and the second support rod, so that the stirring ring and the oil attached to the surface can be isolated in the detection probe by the rubber sleeve, thereby preventing the oil attached to the stirring ring from dripping randomly when the detection probe is removed;

[0018] 2. The present invention is provided with a spherical block. When the pulling rod is pulled to drive the stirring ring to move upward, when the stirring ring is located at the top of the rubber sleeve, the spherical block can also enter the first plug hole and be clamped together with the arc-surface limiting groove on the rubber ring. At this time, the pulling rod can remain stationary under the limiting effect of the arc-surface limiting groove on the spherical block, so that the rubber sleeve can protect the stirring ring when the pulling rod is pulled;

[0019] 3. The present invention is provided with an annular protrusion. After the detection is completed, as the stirring ring is pulled upward by the pull rod, the annular protrusion can cooperate with the convex block to stretch the stirring ring. As the stirring ring is continuously stretched, when the pulling force applied to the stirring ring is greater than the elastic force of the bow-shaped spring piece, the annular protrusion can gradually be offset from the convex block, and the stirring ring can shrink under the action of its own elastic force, thereby allowing the stirring ring to vibrate. Subsequently, most of the oil condensed on the stirring ring and attached to the stirring ring can fall back to the bottom of the inner test tube under the vibration, thereby reducing the amount of oil attached to the stirring ring. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0021] Figure 2 It is a three-dimensional schematic diagram of the detector body in the present invention;

[0022] Figure 3 It is a three-dimensional schematic diagram of the outer and inner test tubes, the detection probe, the pull rod and the locking screw in the present invention;

[0023] Figure 4 The present invention Figure 3 A three-dimensional cross-sectional view of

[0024] Figure 5 The present invention Figure 4 A magnified view of part A;

[0025] Figure 6 The present invention Figure 4 A magnified view of part B;

[0026] Figure 7It is a three-dimensional cross-sectional view of the detection probe and the protection component in the present invention;

[0027] Figure 8 The present invention Figure 7 Enlarged view of part C;

[0028] Fig. 9 It is a three-dimensional schematic diagram of part of the protective components and the rubber convex ring in the present invention;

[0029] Fig.10 It is a three-dimensional schematic diagram of part of the driving components and the pull rods in the present invention.

[0030] In the figure: 1. detector body; 2. cold trap; 3. outer test tube; 4. inner test tube; 5. limit ring; 6. support ring; 7. detection probe; 8. detection rod; 9. protection assembly; 91. fixed tube; 92. rubber sleeve; 93. first support rod; 94. second support rod; 95. fixed ring; 96. L-shaped rod; 97. annular plate; 98. support plate; 99. reset spring; 10. data line; 11. stirring ring; 12. pull rod; 13. drive assembly; 131. electric push rod; 132. connecting plate; 133. slot; 134. annular slot; 14. protection sleeve; 15. locking screw; 16. spherical block; 17. rubber ring; 18. rubber protective pad; 19. rubber protective ring; 20. bow-shaped spring; 21. bump; 22. annular protrusion; 23. rubber convex ring. DETAILED DESCRIPTION

[0031] In order to make the purpose, technical solution and advantages of the embodiments of the present invention more clear, the technical solution of the present invention will be clearly and completely described below in conjunction with the embodiments.

[0032] The present invention provides Figures 1 to 10A freezing point detection device for detecting the preparation of true inhibitor of styrene is shown, comprising a detector body 1, two cold traps 2 are symmetrically provided on the top of the detector body 1, and a refrigeration box is arranged on the inner side of the detector body 1, an outer test tube 3 is inserted into the cold trap 2, an inner test tube 4 is inserted into the inner side of the outer test tube 3, a limiting ring 5 is arranged near the top of the inner test tube 4, and the outer diameter of the limiting ring 5 matches the inner diameter of the outer test tube 3, a supporting ring 6 is arranged at the bottom of the limiting ring 5, and the supporting ring 6 is fixedly connected to the inner wall of the outer test tube 3, a cylindrical detection probe 7 is sleeved on the top of the outer test tube 3, and a bottom axis of the detection probe 7 is vertically installed with A detection rod 8, wherein a protective component 9 is sleeved near the top of the detection rod 8, a data line 10 is connected between the detection probe 7 and the detector body 1, a stirring ring 11 is sleeved near the bottom of the detection rod 8, a pull rod 12 is vertically fixedly connected to the top edge of the stirring ring 11, a first plug hole is penetrated through the top of the detection probe 7, the pull rod 12 is inserted into the first plug hole, a driving component 13 is connected between the tops of the two pull rods 12, a protective sleeve 14 is fixedly sleeved near the top of the outer test tube 3, and locking screws 15 are threadedly penetrated and inserted at the positions opposite to the protective sleeve 14 on both sides of the detection probe 7;

[0033] The driving assembly 13 includes an electric push rod 131, which is vertically mounted on the top of the detector body 1 and is located on the symmetry plane of the two cold traps 2. The top of the electric push rod 131 is horizontally rotatably connected to a connecting plate 132, and the bottom of the connecting plate 132 near both ends is fixedly connected to an arc-shaped card slot 133, and the center of the card slot 133 coincides with the axis of the electric push rod 131. One end of the card slot 133 is designed to be open, and the two card slots 133 are rotationally symmetrical about the electric push rod 131. The side of the pull rod 12 near the top is provided with an annular groove 134 matching the card slot 133, and the annular groove 134 can slide into the card slot 133 through the opening of the card slot 133;

[0034] When performing a freezing point test on an oil product, first inject the oil product to be tested into the inner test tube 4, then inject about 1 ml of anhydrous ethanol into the outer test tube 3, and then insert the inner test tube 4 containing the oil product into the outer test tube 3. After the inner test tube 4 is inserted into the outer test tube 3, the inner test tube 4 can be connected to the outer test tube 3 under the support of the support ring 6 on the limit ring 5, and the pull rod 12 is installed on the detection probe 7, and the stirring ring 11 is sleeved on the periphery of the detection rod 8, and then the detection probe 7 equipped with the stirring ring 11 is sleeved on the top of the outer test tube 3, and then the two locking screws 15 are tightened in turn, so that the outer test tube 3 and the protective sleeve 14 are squeezed by the locking screw 15. The detection probe 7 is locked, and finally the outer test tube 3 is inserted into the cold trap 2. When the outer test tube 3 is inserted into the cold trap 2, the detection probe 7 is adjusted so that the pull rod 12 is opposite to the card slot 133 at the bottom of the connecting plate 132, and then the connecting plate 132 is rotated horizontally so that the two card slots 133 at the bottom are driven to approach the annular slots 134 at the top of the two pull rods 12, and finally the annular slots 134 of the pull rod 12 can be connected with the corresponding card slots 133 through the opening of the card slots 133. When the pull rod 12 is connected to the connecting plate 132, the electric push rod 131 and the detector body 1 are started, so that the oil in the inner test tube 4 is tested for the freezing point by using the detector body 1;

[0035] And during the detection process, the electric push rod 131 can perform periodic extension and shortening operations, thereby driving the pull rod 12 and the stirring ring 11 to move upward through the connecting plate 132, thereby realizing the stirring operation of the oil product, and then the oil product can be cooled more evenly and quickly by the refrigeration box inside the detector body 1, thereby improving the detection efficiency of the oil product's freezing point.

[0036] like Figures 4 to 9As shown, the protection component 9 includes a fixed tube 91, which is detachably mounted on the inner wall of the top of the detection probe 7, and the detection rod 8 is located at the inner axis of the fixed tube 91, and the bottom edge of the fixed tube 91 is fixedly connected with a coaxial and stretchable rubber sleeve 92, the top diameter of the rubber sleeve 92 is smaller than the bottom diameter thereof, and in the initial state, the bottom diameter of the rubber sleeve 92 is smaller than the inner diameter of the stirring ring 11, and a plurality of first support rods 93 are evenly distributed in an annular manner on the inner wall of the rubber sleeve 92, the top of the first support rod 93 is hinged to the bottom edge of the fixed tube 91, the bottom end of the first support rod 93 is hinged to a second support rod 94, and the bottom ends of the plurality of second support rods 94 are hinged to the same fixed ring 95, and the fixed ring 95 is slidably sleeved on the detection rod 8, The outer diameter of the fixing ring 95 is smaller than the inner diameter of the fixing tube 91, and a plurality of L-shaped rods 96 are fixedly connected to the top of the fixing ring 95. A plurality of vertical strip-shaped limiting holes are penetrated through the side wall of the fixing tube 91, and the horizontal sections of the plurality of L-shaped rods 96 are penetrated and inserted into the plurality of strip-shaped limiting holes one by one. The ends of the horizontal sections of the plurality of L-shaped rods 96 are fixedly connected with the same annular plate 97, and the annular plate 97 is slidably sleeved on the fixing tube 91, a second plug hole is penetrated through the annular plate 97, and the pull rod 12 is penetrated and inserted into the second plug hole, and the tops of the horizontal sections of the plurality of L-shaped rods 96 are fixedly connected with the same annular support plate 98, and the support plate 98 is located on the inner side of the fixing tube 91, and a reset spring 99 is fixedly connected between the top of the support plate 98 and the top inner wall of the detection probe 7;

[0037] During the process of the detector body 1 detecting the oil product, the stirring ring 11 can stir the oil product in the inner test tube 4 under the action of the electric push rod 131. When the oil product is detected, the connecting plate 132 is first rotated so that the top end of the pull rod 12 can be moved out from the opening of the slot 133, and then the pull rod 12 is pulled to drive the stirring ring 11 to move upward. In this process, the stirring ring 11 gradually approaches the fixed ring 95. As the stirring ring 11 continues to move upward, multiple second support rods 94 and the rubber sleeve 92 can enter the inner side of the stirring ring 11 from top to bottom. As the stirring ring 11 moves further upward, when the stirring ring 11 contacts the bottom of the annular plate 97, the bottom of the stirring ring 11 is higher than the bottom edge of the rubber sleeve 92. At this time, as the pull rod 12 continues to be pulled, the stirring ring 11 can gradually push the annular plate 97 upward, so that the annular plate 97 can move upward and compress the reset spring 99. 7 moves upward, the annular plate 97 can pull the fixing ring 95 upward through the L-shaped rod 96, and as the fixing ring 95 moves upward, the top ends of the multiple second support rods 94 can drive the bottom ends of the multiple first support rods 93 to synchronously deflect in the direction close to the inner wall of the detection probe 7, and as the multiple first support rods 93 deflect, the rubber sleeve 92 can be gradually stretched under the action of the multiple first support rods 93, and the bottom edge of the rubber sleeve 92 gradually approaches the inner wall of the detection probe 7. When the bottom edge of the rubber sleeve 92 is tightly attached to the side inner wall of the detection probe 7, the second support rod 94 and the first support rod 93 both stop deflecting. At this time, the stirring ring 11 and the oil attached to its surface can be isolated in the detection probe 7 by the rubber sleeve 92, so that when the locking screw 15 is loosened to remove the detection probe 7 from the top of the outer test tube 3, the oil attached to the stirring ring 11 will not drip at will, thereby avoiding the subsequent cleaning operation of the dripping oil.

[0038] like Figure 6 and Figure 7 As shown, a spherical block 16 is fixedly sleeved at a position near the bottom end of the pull rod 12, and the diameter of the spherical block 16 is smaller than the inner diameters of the first jack and the second jack, an annular rubber ring 17 is fixedly connected to the inner wall of the first jack, the inner diameter of the rubber ring 17 is smaller than the diameter of the spherical block 16, and an arc-shaped limiting groove matching the spherical block 16 is provided on the inner wall of the rubber ring 17, the friction force between the arc-shaped limiting groove and the spherical block 16 is greater than the maximum elastic force of the reset spring 99 on the annular plate 97, and the distance between the spherical block 16 and the stirring ring 11 is smaller than the distance between the top of the annular plate 97 and the bottom inner wall of the detection probe 7 in the initial state;

[0039] By providing a spherical block 16, in the process of pulling the pull rod 12 to drive the stirring ring 11 to move upward, when the stirring ring 11 contacts the annular plate 97, the annular plate 97 can gradually move upward under the pushing of the stirring ring 11 and compress the reset spring 99, and the spherical block 16 can also gradually approach the first socket. When the stirring ring 11 is located at the top of the rubber sleeve 92, the spherical block 16 can also enter the first socket and be clamped together with the arc limit groove on the rubber ring 17. At this time, the pull rod 12 can remain stationary under the limiting effect of the arc limit groove on the spherical block 16, so that the rubber sleeve 92 can protect the stirring ring 11 without continuously pulling the pull rod 12.

[0040] like Figure 4 and Figure 5 As shown, the tops of the inner test tube 4 and the outer test tube 3 are provided with the same annular rubber protective pad 18, the bottom of the rubber protective pad 18 is provided with a rubber protective ring 19, and the rubber protective ring 19 is inserted into the gap between the inner test tube 4 and the outer test tube 3;

[0041] By providing the rubber protective ring 19, when the inner test tube 4 is inserted into the outer test tube 3, the rubber protective pad 18 can be placed on the top of the inner test tube 4 and the outer test tube 3, and the rubber protective ring 19 can be inserted into the gap between the inner test tube 4 and the outer test tube 3, so that when the detection probe 7 is sleeved on the top of the outer test tube 3, the rubber protective pad 18 can protect the top edges of the inner test tube 4 and the outer test tube 3, thereby preventing the top edges of the inner test tube 4 and the outer test tube 3 from being bumped;

[0042] In addition, the rubber protection ring 19 inserted between the inner test tube 4 and the outer test tube 3 can restrict the inner test tube 4, thereby avoiding shaking between the inner test tube 4 and the outer test tube 3 and ensuring the stability of the connection between the two.

[0043] like Figures 4 to 6 As shown, the inner side of the rubber protective pad 18 is made of hard rubber, and a plurality of bow-shaped spring pieces 20 are fixedly connected to the inner side of the rubber protective pad 18, the bottom end of the bow-shaped spring piece 20 is located in the inner test tube 4, and the middle part of the bow-shaped spring piece 20 protrudes toward the direction close to the detection rod 8, a protrusion 21 is fixedly connected to the middle position of the protruding side of the bow-shaped spring piece 20, and the top of the protrusion 21 is inclined toward the direction close to the detection rod 8, the stirring ring 11 is in a spring shape as a whole, and the stirring ring 11 is elastic, and an annular protrusion 22 is fixedly connected to the bottom edge of the stirring ring 11, the bottom side of the annular protrusion 22 is inclined toward the direction away from the detection rod 8, and the bottom edge of the annular protrusion 22 can contact with the protrusion 21, and in the initial state, the distance between the bottom end of the rubber sleeve 92 and the bottom end of the annular plate 97 is greater than the height of the stirring ring 11, and the outer diameter of the stirring ring 11 is smaller than the inner diameter of the detection probe 7;

[0044] By providing the annular protrusion 22, after the detection is completed, as the stirring ring 11 is pulled upward by the pull rod 12, when the stirring ring 11 moves to the height of the protrusion 21, the outer side of the stirring ring 11 will not contact the protrusion 21. At this time, as the stirring ring 11 continues to be pulled upward by the pull rod 12, when the annular protrusion 22 contacts the protrusion 21, the protrusion 21 can block the annular protrusion 22, so that the stirring ring 11 is gradually stretched by the resistance of the protrusion 21 to the annular protrusion 22. As the stirring ring 11 is continuously stretched, the pulling force on the stirring ring 11 is gradually increased. When the pulling force applied to 11 is greater than the elastic force of the bow-shaped spring piece 20, the bow-shaped spring can be deflected in the direction away from the detection rod 8 under the squeezing force of the annular protrusion 22 on the protrusion 21, and the annular protrusion 22 can gradually be offset from the protrusion 21. When the annular protrusion 22 is no longer blocked by the protrusion 21, the stirring ring 11 can shrink under the action of its own elastic force, so that the stirring ring 11 can vibrate, and then most of the oil condensed on the stirring ring 11 and attached to the stirring ring 11 can fall back to the bottom of the inner test tube 4 under the action of vibration, thereby reducing the amount of oil attached to the stirring ring 11.

[0045] like Figure 7 and Fig. 9 As shown, the bottom edge of the rubber sleeve 92 is fixedly connected with a rubber convex ring 23, the rubber convex ring 23 is elastic, and the rubber convex ring 23 can fit with the inner wall of the side of the detection probe 7;

[0046] By providing the rubber convex ring 23, when the bottom edge of the rubber sleeve 92 is fitted together with the inner wall of the detection probe 7 under the action of the first support rod 93 and the second support rod 94, the rubber convex ring 23 can increase the sealing between the bottom edge of the rubber sleeve 92 and the inner wall of the detection probe 7, thereby enhancing the protective effect of the rubber sleeve 92 on the stirring ring 11.

[0047] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit them.

Claims

1. A freezing point detection device for detecting the preparation of styrene true polymerization inhibitor, comprising a detector body (1), characterized in that: Two cold traps (2) are symmetrically provided at the top of the detector body (1), and a refrigeration box is provided on the inner side of the detector body (1). An outer test tube (3) is inserted into the cold trap (2), and an inner test tube (4) is inserted into the inner side of the outer test tube (3). A limit ring (5) is provided near the top of the inner test tube (4), and the outer diameter of the limit ring (5) matches the inner diameter of the outer test tube (3). A support ring (6) is provided at the bottom of the limit ring (5), and the support ring (6) is fixedly connected to the inner wall of the outer test tube (3). A cylindrical detection probe (7) is sleeved on the top of the outer test tube (3), and a detection rod (8) is vertically installed at the bottom axis of the detection probe (7). The detection rod (8) is near the top. A protective component (9) is sleeved at the end thereof, a data line (10) is connected between the detection probe (7) and the detector body (1), a stirring ring (11) is sleeved at a position near the bottom end of the detection rod (8), a pull rod (12) is vertically fixedly connected to the top edge of the stirring ring (11), a first plug hole is penetrated through the top of the detection probe (7), the pull rod (12) is inserted into the first plug hole, a driving component (13) is connected between the tops of the two pull rods (12), a protective sleeve (14) is fixedly sleeved at a position near the top end of the outer test tube (3), and locking screws (15) are threadedly penetrated and inserted at positions opposite to the protective sleeve (14) on both sides of the detection probe (7); The protection component (9) comprises a fixed tube (91), the fixed tube (91) being detachably mounted on the inner wall of the top of the detection probe (7), and the detection rod (8) being located at the inner axis of the fixed tube (91), the bottom edge of the fixed tube (91) being fixedly connected with a coaxial and stretchable rubber sleeve (92), the top diameter of the rubber sleeve (92) being smaller than the bottom diameter thereof, and in an initial state, the bottom diameter of the rubber sleeve (92) being smaller than the inner diameter of the stirring ring (11), a plurality of first support rods (93) being evenly distributed in an annular pattern on the inner wall of the rubber sleeve (92), the top of the first support rod (93) being hinged to the bottom edge of the fixed tube (91), the bottom end of the first support rod (93) being hinged to a second support rod (94), the bottom ends of the plurality of second support rods (94) being hinged to the same fixed ring (95), and the fixed ring (95) being slidably sleeved on the detection rod (8), The outer diameter of the fixing ring (95) is smaller than the inner diameter of the fixing tube (91); a plurality of L-shaped rods (96) are fixedly connected to the top of the fixing ring (95); a plurality of vertical strip-shaped limiting holes are penetrated through the side wall of the fixing tube (91); and the horizontal sections of the plurality of L-shaped rods (96) are inserted into the plurality of strip-shaped limiting holes in a one-to-one correspondence; a same annular plate (97) is fixedly connected between the ends of the horizontal sections of the plurality of L-shaped rods (96); the annular plate (97) is slidably sleeved on the fixing tube (91); a second plug hole is penetrated through the annular plate (97); and the pull rod (12) is inserted into the second plug hole; a same annular support plate (98) is fixedly connected to the top of the horizontal sections of the plurality of L-shaped rods (96); the support plate (98) is located on the inner side of the fixing tube (91); and a reset spring (99) is fixedly connected between the top of the support plate (98) and the inner wall of the top of the detection probe (7).

2. The freezing point detection device for detecting the preparation of styrene true polymerization inhibitor according to claim 1, characterized in that: The driving assembly (13) comprises an electric push rod (131), the electric push rod (131) being vertically mounted on the top of the detector body (1), and the electric push rod (131) being located on the symmetry plane of the two cold traps (2), the top of the electric push rod (131) being horizontally rotatably connected to a connecting plate (132), the bottom of the connecting plate (132) being fixedly connected to arc-shaped slots (133) near both ends, and the center of the slot (133) coincides with the axis of the electric push rod (131), one end of the slot (133) being open, and the two slots (133) being rotationally symmetrical about the electric push rod (131), and a ring groove (134) matching the slot (133) being provided on the side of the pull rod (12) near the top, and the ring groove (134) being able to slide into the slot (133) through the opening of the slot (133).

3. The freezing point detection device for detecting the preparation of styrene true polymerization inhibitor according to claim 2, characterized in that: A spherical block (16) is fixedly sleeved near the bottom end of the pull rod (12), and the diameter of the spherical block (16) is smaller than the inner diameters of the first jack and the second jack. An annular rubber ring (17) is fixedly connected to the inner wall of the first jack, and the inner diameter of the rubber ring (17) is smaller than the diameter of the spherical block (16). An arc-shaped limit groove matching the spherical block (16) is provided on the inner wall of the rubber ring (17). The friction force between the arc-shaped limit groove and the spherical block (16) is greater than the maximum elastic force of the reset spring (99) on the annular plate (97). The distance between the spherical block (16) and the stirring ring (11) is smaller than the distance between the top of the annular plate (97) and the bottom inner wall of the detection probe (7) in the initial state.

4. The freezing point detection device for detecting the preparation of styrene true polymerization inhibitor according to claim 1, characterized in that: The tops of the inner test tube (4) and the outer test tube (3) are provided with the same annular rubber protective pad (18), the bottom of the rubber protective pad (18) is provided with a rubber protective ring (19), and the rubber protective ring (19) is inserted into the gap between the inner test tube (4) and the outer test tube (3).

5. The freezing point detection device for detecting the preparation of styrene true polymerization inhibitor according to claim 4, characterized in that: The inner side of the rubber protective pad (18) is made of hard rubber, and a plurality of bow-shaped spring pieces (20) are fixedly connected to the inner side of the rubber protective pad (18), the bottom end of the bow-shaped spring piece (20) is located in the inner test tube (4), and the middle part of the bow-shaped spring piece (20) protrudes in a direction close to the detection rod (8), a protrusion (21) is fixedly connected to the middle position of one side of the protrusion of the bow-shaped spring piece (20), and the top of the protrusion (21) is inclined in a direction close to the detection rod (8), the stirring ring (11) is in a spring shape as a whole, and the stirring ring (11) is elastic, and an annular protrusion (22) is fixedly connected to the bottom edge of the stirring ring (11), the bottom edge of the annular protrusion (22) is inclined in a direction away from the detection rod (8), and the bottom edge of the annular protrusion (22) can contact the protrusion (21).

6. The freezing point detection device for detecting the preparation of styrene true polymerization inhibitor according to claim 1, characterized in that: A rubber convex ring (23) is fixedly connected to the bottom edge of the rubber sleeve (92); the rubber convex ring (23) is elastic and can fit the inner wall of the side of the detection probe (7).

7. The freezing point detection device for detecting the preparation of styrene true polymerization inhibitor according to claim 6, characterized in that: In the initial state, the distance between the bottom end of the rubber sleeve (92) and the bottom end of the annular plate (97) is greater than the height of the stirring ring (11), and the outer diameter of the stirring ring (11) is smaller than the inner diameter of the detection probe (7).

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