Peroxide value detection pre-treatment equipment

Abstract

The present invention relates to the technical field of food detection, and specifically to a peroxide value detection pre-treatment device, comprising: a base; a liquid storage bottle, storing a sample to be filtered; a liquid receiving bottle, receiving the filtered sample; a filtering device, used to hold a desiccant, with an inlet connected to the liquid storage bottle and an outlet connected to the liquid receiving bottle; the filtering device comprises at least two stages of filtering units connected in sequence, and dewaters the sample at least twice; an interface connected to a vacuum device is provided at one end of the filtering device close to the liquid receiving bottle. Beneficial effects: negative pressure can be used to make the sample automatically flow from the liquid storage bottle through the filtering device and finally flow into the liquid receiving bottle, thereby improving filtering efficiency, avoiding long-term exposure and oxidation of the sample, and ensuring experimental accuracy; one operation can dewater the sample at least twice, the dewatering is relatively thorough, and there is no need to repeat the filtering operation, which can not only save time, but also avoid the experimenter from staying in front of the filtering device for a long time, thereby ensuring the personal safety of the experimenter.

Description

Technical Field

[0001] The invention relates to the technical field of food detection, and in particular to a peroxide value detection pre-treatment device. Background Art

[0002] The peroxide value is an indicator of the degree of oxidation of oils and fatty acids. It is used to indicate whether a sample has deteriorated due to oxidation. The quality and degree of deterioration of foods made with oils and fats as raw materials can be judged by testing their peroxide value.

[0003] According to the national standard, the first and second methods for determining the peroxide value in food involve sample pretreatment, which requires extraction, filtration and rotary evaporation. Due to the different states of the samples, atmospheric pressure filtration often cannot filter the samples quickly, causing the samples to be exposed to oxidation for a long time. In addition, due to different operations of the experimenters, one filtration often cannot completely remove impurities and moisture, and repeated filtration is required, which takes a long time. The experimenter needs to stay in front of the filtration device for a long time, and the volatilization of organic reagents is harmful to health. Therefore, there is a special need for a peroxide value detection pretreatment device that can improve experimental efficiency, ensure experimental accuracy, and ensure the personal safety of the experimenter. Summary of the invention

[0004] The purpose of the present invention is to provide a peroxide value detection pretreatment device which can improve experimental efficiency, ensure experimental accuracy, and ensure the personal safety of experimenters.

[0005] To achieve the above purpose, the present invention adopts the following technical solutions:

[0006] Peroxide value detection pre-treatment equipment, including:

[0007] Base;

[0008] A liquid storage bottle is arranged on the base, and is used to store the sample to be filtered;

[0009] A liquid receiving bottle is arranged on the base, and is used to receive the filtered sample;

[0010] A filter device, the inlet of the filter device is connected to the liquid storage bottle, and the outlet is connected to the liquid receiving bottle. The filter device is used to hold a desiccant to remove water from the sample flowing through the filter device;

[0011] The filtering device comprises at least two filter units connected in sequence and arranged on a base, so as to remove water from the sample at least twice;

[0012] The end of the liquid receiving bottle or the filtering device close to the liquid receiving bottle is provided with an interface for connecting to a vacuum pumping device, so that the sample to be filtered automatically flows from the liquid storage bottle through the filtering device under the action of negative pressure and finally flows into the liquid receiving bottle.

[0013] The beneficial effect of the above technical solution is that: since an interface for connecting to a vacuum device is provided on the end of the liquid receiving bottle or the filtering device close to the liquid receiving bottle, when the vacuum device is started, the negative pressure can be utilized to make the sample to be filtered automatically flow from the liquid storage bottle through the filtering device and finally flow into the liquid receiving bottle, thereby improving the filtering efficiency, avoiding long-term exposure of the sample to oxidation, and ensuring the accuracy of the experiment; in addition, since the filtering device includes at least two stages of filtering units connected in sequence on the base, the sample can be dehydrated at least twice in one operation, the dehydration is more thorough, and there is no need to repeat the filtering operation, which not only saves time, but also avoids the experimenter from staying in front of the filtering device for a long time, thereby ensuring the personal safety of the experimenter.

[0014] Furthermore, in order to facilitate the setting and manufacturing of the filtering device and the loading of the desiccant, the filtering unit is a U-shaped filtering tube with the tube mouth facing upward, the U-shaped filtering tube is used to hold the desiccant, and an up and down moving device for controlling the up and down movement of each U-shaped filtering tube is provided on the base; the base includes a bottom plate and a column fixed on the bottom plate, a shell is fixed on the top of the column, and the filtering device also includes connecting pipes respectively fixed on the shell for connecting the U-shaped filtering tube with a liquid storage bottle, the U-shaped filtering tube with a liquid receiving bottle, and two adjacent U-shaped filtering tubes. The U-shaped filtering tube has a docking station during the up and down movement process, which is sealed and docked with the corresponding connecting pipe when moving upward to form a sealed and connected filtering device, and the U-shaped filtering tube also has a separation station when moving downward to separate from the corresponding connecting pipe so as to load the desiccant into the U-shaped filtering tube.

[0015] Furthermore, in order to make it more convenient to load desiccant into the U-shaped filter tube, the peroxide value detection pretreatment equipment also includes a horizontal moving device for controlling the horizontal movement of each U-shaped filter tube. The horizontal moving device is connected to the up and down moving device and cooperates therewith, and is used to move the U-shaped filter tube horizontally to the outside of the base and the shell when the U-shaped filter tube is in the separation position, so as to load desiccant into the U-shaped filter tube.

[0016] Furthermore, in order to facilitate the configuration and installation of the up and down moving device and the horizontal moving device, the up and down moving device is an upper and lower hydraulic support rod with the bottom end fixed to the bottom plate, and the horizontal moving device includes a horizontal moving plate and a horizontal hydraulic support rod installed on the horizontal moving plate, one end of the horizontal hydraulic support rod is fixed to the horizontal moving plate, and the other end is fixedly connected to the top end of the upper and lower hydraulic support rods, and a fixing structure for fixing the U-shaped filter tube is provided on the horizontal moving plate.

[0017] Furthermore, in order to facilitate vacuuming, the vacuuming device is installed in the shell.

[0018] Furthermore, in order to facilitate connection with the vacuum device, a joint is provided on one end of the filtering device close to the liquid receiving bottle, and the joint includes an outer tube and an inner tube arranged inside the outer tube. One end of the outer tube and the inner tube is fixedly sealed, and the other end has a gap to form an annular space. The inner tube is used for allowing the sample to enter the liquid receiving bottle. A connecting pipe connected to the annular space is provided on the outer tube, and the interface is formed by the pipe mouth of the connecting pipe.

[0019] Furthermore, in order to facilitate the preparation of samples to be filtered, the liquid storage bottle includes an upper liquid storage bottle, a lower liquid storage bottle and a bottle cap. The upper liquid storage bottle and the lower liquid storage bottle are detachably connected together by a bottle mouth clamp, the bottle cap is installed on the top of the upper liquid storage bottle, a liquid storage bottle diaphragm is arranged in the upper liquid storage bottle, and the lower liquid storage bottle is connected to the filtering device. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a three-dimensional diagram of the peroxide value detection pre-treatment device in the present invention;

[0021] Figure 2 It is a left view of the peroxide value detection pre-treatment device in the present invention;

[0022] Figure 3 It is a right view of the peroxide value detection pre-treatment device in the present invention;

[0023] Figure 4 for Figure 1 A partial structural diagram of the peroxide value detection pre-treatment device after removing the shell;

[0024] Figure 5 It is a connection structure diagram of a liquid storage bottle, a liquid receiving bottle and an intermediate filtering device in the peroxide value detection pre-treatment device of the present invention;

[0025] Figure 6 It is an exploded structural diagram of a liquid storage bottle in the peroxide value detection pre-treatment device of the present invention;

[0026] Figure 7 for Figure 5 Exploded view of the local structure of the middle and tail connecting pipe and the liquid receiving bottle;

[0027] Figure 8 for Figure 5 and Figure 7 Structural diagram of the middle pipe;

[0028] Fig. 9 for Figure 5 Exploded view of the local structure of the middle U-shaped filter tube and the middle connecting tube;

[0029] Fig.10 It is a structural diagram of the connection between the horizontal moving device and the U-shaped filter tube in the peroxide value detection pre-treatment device of the present invention;

[0030] Fig.11 for Fig.10 Side view of

[0031] Fig.12 for Fig.10 Exploded view of the local structure;

[0032] Fig.13 for Fig.10 A stereogram from an upward perspective.

[0033] In the figure: 1-operation panel; 2-housing; 3-display screen; 4-vacuum pump; 5-liquid collecting bottle; 6-bottom plate; 7-moving mechanism; 70-roller; 71-moving plate; 72-fixing frame; 73-handle screw; 74-hook plate; 75-fixing block; 76-upper and lower hydraulic support rods; 761-helical spring; 77-front and rear hydraulic support rods; 78-nut; 79-roller shaft; 8-liquid stop valve; 9-filter device; 91-head connecting pipe; 92-connecting rod; 93-U-shaped filter tube; 94-fixing rod; 95-middle connecting pipe; 96-tail connecting pipe; 97-upper diaphragm; 98-lower diaphragm; 10-column; 11-liquid storage bottle; 111-bottle cap; 112-gasket; 113-liquid storage bottle diaphragm; 114-upper liquid storage bottle; 115-bottle mouth clamp; 116-lower liquid storage bottle; 12-trachea; 13-connector; 131-outer tube; 132-inner tube; 133-connecting pipe. DETAILED DESCRIPTION

[0034] An embodiment of the peroxide value detection pre-treatment device of the present invention is as follows Figure 1 As shown, the base includes a bottom plate 6 and four columns 10 fixed on the bottom plate 6 , and a shell 2 is fixed on the top of the columns 10 .

[0035] Combination Figure 2 As shown, six liquid storage bottles 11 are arranged on the left end of the bottom plate 6 along the front-to-back direction, and the liquid storage bottles 11 are used to store samples to be filtered. The structure of the liquid storage bottles 11 is as follows Figure 6 As shown, it includes a bottle cap 111, an upper liquid storage bottle 114, and a lower liquid storage bottle 116. The upper liquid storage bottle 114 and the lower liquid storage bottle 116 are detachably connected together through a bottle mouth clamp 115. The bottle cap 111 is installed on the top of the upper liquid storage bottle 114, and a gasket 112 is provided at the joint position of the upper liquid storage bottle 114 and the bottle cap 111. A liquid storage bottle diaphragm 113 is fixedly provided in the upper liquid storage bottle 114, and the liquid storage bottle diaphragm 113 is provided at a lower middle position in the upper liquid storage bottle 114. The liquid storage bottle diaphragm 113 has sieve holes for liquid to pass through.

[0036] In addition, a telescopic device (not shown in the figure) connected to the bottle cap 111 is provided in the shell 2. The telescopic device can specifically be a cylinder, a hydraulic cylinder or an electric push rod. Under the control of the telescopic device, the bottle cap 111 can be separated from the upper liquid storage bottle 114, thereby facilitating the addition of the sample to be filtered into the upper liquid storage bottle 114.

[0037] like Figure 3 As shown, six liquid receiving bottles 5 are arranged on the right end of the bottom plate 6 along the front-to-back direction, and the liquid receiving bottles 5 correspond to the liquid storage bottles 11 one by one, and a filtering device 9 is connected between the corresponding liquid receiving bottles 5 and the liquid storage bottles 11. Figure 4 and Figure 5 As shown, the filter device 9 includes three-stage filter units that are spaced from left to right and connected in sequence. The filter unit in this embodiment is a U-shaped filter tube 93 with the tube opening facing upward, and the U-shaped filter tube 93 is used to hold a desiccant. The filter device 9 also includes connecting pipes fixed to the housing 2 for connecting the U-shaped filter tube 93 with the liquid storage bottle 11, the U-shaped filter tube 93 with the liquid receiving bottle 5, and two adjacent U-shaped filter tubes 93, so the connecting pipes include a head connecting pipe 91, two middle connecting pipes 95, and a tail connecting pipe 96, and each connecting pipe is fixed to the housing 2 by a fixing rod 94.

[0038] Combination Figure 1 As shown, a portion of the head connecting pipe 91 is located inside the bottom plate 6, and a liquid stop valve 8 is provided on the head connecting pipe 91 to control the on-off of the pipeline. Fig. 9 As shown, lower diaphragms 98 are fixedly arranged in the vertical tubes on both sides of the U-shaped filter tube 93, and the lower diaphragms 98 are arranged close to the tube opening of the U-shaped filter tube 93. At the same time, upper diaphragms 97 are fixedly arranged in the vertical tubes on both sides of the middle connecting tube 95, and the upper diaphragms 97 are arranged close to the tube opening of the middle connecting tube 95, so as to form a narrow space between the upper and lower diaphragms. The upper and lower diaphragms have sieve holes, which can allow the desiccant to pass through and can also filter impurities in the sample.

[0039] In addition, an upper diaphragm is fixedly provided at the tube opening of the head connecting tube 91 close to the U-shaped filter tube 93, and an upper diaphragm is fixedly provided at the tube opening of the tail connecting tube 96 close to the U-shaped filter tube 93. In other words, Figure 5 There are totally six groups of upper and lower diaphragms, which are respectively located at the docking positions of the six groups of upper and lower pipe openings.

[0040] like Figure 5 and Figure 7As shown, a joint 13 is fixed at the end of the tail connecting tube 96, and the joint 13 is sealed and connected to the liquid receiving bottle 5. The liquid receiving bottle 5 is placed on the bottom plate 6, and an electric lifting device (not shown in the figure) is provided on the bottom plate 6 for supporting the liquid receiving bottle 5 and moving it up and down. Under the action of the electric lifting device, the liquid receiving bottle 5 is controlled to move upward, so that the liquid receiving bottle 5 can be sealed and connected to the joint 13, so as to carry out a filtration experiment and collect the filtered sample; the liquid receiving bottle 5 is controlled to move downward to keep it away from the joint 13, so as to facilitate the removal of the liquid receiving bottle.

[0041] The structure of the joint 13 is as follows Figure 8 As shown, the joint 13 includes an outer tube 131 and an inner tube 132 disposed inside the outer tube 131, the inner tube 132 is funnel-shaped, the outer tube 131 and the inner tube 132 are fixedly sealed at the top, and the lower part is spaced to form an annular space, the inner tube 132 is connected to the tail connecting tube 96, the inner tube 132 is used for the sample to enter the liquid receiving bottle 5, and the bottom end of the inner tube 132 protrudes from the outer tube 131. The outer tube 131 is provided with a connecting pipe 133 that is connected to the annular space.

[0042] like Figure 1 and Figure 3 As shown, a vacuum device is installed in the housing 2. The vacuum device in this embodiment is a vacuum pump 4. The vacuum pump 4 is connected to the connecting pipe 133 of the joint 13 above each liquid receiving bottle 5 through the air pipe 12, so the pipe mouth of the connecting pipe 133 forms an interface connected to the vacuum pump 4. Specifically, the air pipe 12 includes a main air pipe and six branch air pipes. When the vacuum pump is turned on, the six liquid receiving bottles 5 can be vacuumed at the same time. Under the action of negative pressure, the sample to be filtered in the liquid storage bottle 11 will automatically flow through the filtering device for water removal and filtration, and finally flow into the liquid receiving bottle 5.

[0043] Combination Figure 1 , Figure 10~Figure 13 As shown, the peroxide value detection pre-treatment equipment also includes a moving mechanism 7 for controlling the up-down and forward-backward movement of each U-shaped filter tube 93. The moving mechanism 7 is composed of an up-down moving device and a forward-backward moving device (i.e., a horizontal moving device). The up-down moving device is an upper and lower hydraulic support rod 76 whose bottom end is fixed on the bottom plate 6. There are two upper and lower hydraulic support rods 76, and a fixed block 75 is fixed to the top of the two upper and lower hydraulic support rods 76. The forward and backward moving device includes a moving plate 71 and a front and rear hydraulic support rod 77 installed on the moving plate 71. One end of the front and rear hydraulic support rod 77 is fixed on the moving plate 71, and the other end is fixedly connected to the fixed block 75.

[0044] A fixing frame 72 is fixed to the side of the moving plate 71 by means of a handle screw 73 and a nut 78, and the fixing frame 72 is used to fix the U-shaped filter tube 93. A hook plate 74 is also fixed to the moving plate 71, and the hook plate 74 is used to cooperate with a baffle (not shown in the figure) provided on the bottom plate 6. A roller 70 is also installed on the moving plate 71 through a roller shaft 79, and the roller 70 cooperates with a track (not shown in the figure) provided on the bottom plate 6, so as to facilitate the forward and backward movement of the forward and backward moving device along the track.

[0045] like Figure 1 As shown, there are two sets of up-and-down moving devices and forward-and-backward moving devices, which are respectively located on the left and right sides of the three U-shaped filter tubes 93. The left moving plate 71 fixes the leftmost column of U-shaped filter tubes 93, and the right moving plate 71 fixes the rightmost column of U-shaped filter tubes 93. The middle column of U-shaped filter tubes 93 are respectively fixedly connected to the left column of U-shaped filter tubes and the right column of U-shaped filter tubes through connecting rods 92 ( Figure 4 Not all connecting rods are shown).

[0046] Since hydraulic struts are used, downward force can be manually applied to the moving mechanism 7, the upper and lower hydraulic struts 76 are compressed, and the moving plate 71 drives each U-shaped filter tube 93 to move downward and separate from the corresponding connecting tube. At this time, the U-shaped filter tube 93 is in the separation position, and then the moving plate 71 is pulled forward, the front and rear hydraulic struts 77 are extended, and the moving plate 71 drives each U-shaped filter tube 93 to move forward to the outside of the base and the shell. At this time, desiccant can be conveniently added to each U-shaped filter tube 93. During this process, the hook plate 74 will cooperate with the baffle to limit the extreme moving position of the moving plate 71.

[0047] After the desiccant is loaded, the movable plate 71 is pushed under the housing, and after the upper and lower hydraulic support rods 76 are reset, each U-shaped filter tube 93 is sealed and docked with the corresponding connecting tube, thereby forming a sealed and connected filtering device, at which time the U-shaped filter tube 93 is in the docking position. In addition, in order to facilitate the reset of the upper and lower hydraulic support rods 76, a coil spring 761 is sleeved on the upper and lower hydraulic support rods 76.

[0048] In addition, if Figure 1 As shown, an operation panel 1 and a display screen 3 are provided on the shell 2. The operation panel 1 can control the start and stop of the vacuum pump 4, the telescopic device connected to the bottle cap 111, and the lifting device supporting the liquid receiving bottle 5, and the display screen 3 can display corresponding parameters.

[0049] The working principle of the peroxide value detection pre-treatment equipment in the present invention is:

[0050] Before the experiment, the lower liquid storage bottle 116 and the upper liquid storage bottle 114 are fixed by the bottle mouth clamp 115, and the grinding device is in the middle. Vaseline can be applied before use to increase the sealing. The bottle cap 111 is raised by the telescopic device, and a quick filter paper is placed on the liquid storage bottle diaphragm 113 of the upper liquid storage bottle 114. The sample after the crushing process is loaded into the upper liquid storage bottle 114, and petroleum ether of 2-3 times the volume of the sample is added. After fully mixing, the bottle cap 111 is tightly covered, and the leaching is performed for more than 12 hours, so that the grease in the sample is fully dissolved in the petroleum ether. The quick filter paper in the liquid storage bottle can make the liquid pass through, and the large sample residue will remain on the filter paper.

[0051] Then, the movable plate 71 is pressed downward and pulled outward at the same time, thereby extracting each U-shaped filter tube 93, and a proper amount of anhydrous sodium sulfate is loaded into the U-shaped filter tube 93 as a desiccant. The anhydrous sodium sulfate powder will pass through the sieve holes on the lower diaphragm 98 to reach the bottom of the U-shaped filter tube 93, and then a quick filter paper is placed on the lower diaphragm 98 of the U-shaped filter tube 93. The quick filter paper allows liquid to pass through, but can prevent the anhydrous sodium sulfate powder from passing through, thereby ensuring that it is located in the U-shaped filter tube 93 and ensuring the water removal capacity of the U-shaped filter tube 93.

[0052] Then push the U-shaped filter tube 93 under the housing, and under the action of the upper and lower hydraulic support rods 76 and the spiral spring 761, the U-shaped filter tube 93 is sealed and docked with the corresponding connecting tube above. Then control the lifting device to lift the liquid receiving bottle 5, so that the liquid receiving bottle 5 is connected to the joint 13. The conical bottle mouth of the liquid receiving bottle 5 and the conical bottom of the outer tube 131 of the joint 13 are both ground, and vaseline can be applied before use to increase the sealing performance.

[0053] Then open the liquid stop valve 8, turn on the vacuum pump 4, start vacuuming, and under the action of negative pressure, the petroleum ether liquid automatically flows through the liquid storage bottle through the filtering device and enters the liquid receiving bottle to complete the three-stage filtration.

[0054] After the experiment, clean the equipment. First, lift the cap of the liquid storage bottle, remove the bottle clamp, and clean the upper liquid storage bottle; pull out the U-shaped filter tube for cleaning; finally, close the system, evacuate the vacuum, and clean the system 3-5 times with pure petroleum ether. The waste petroleum ether can be rotary evaporated to obtain pure petroleum ether for recycling.

[0055] The peroxide value detection pre-treatment device of the present invention adopts a vacuum pump to generate negative pressure for experiment, and arranges six rows of liquid storage bottles, filtering devices and liquid receiving bottles to conduct experiments simultaneously, which can improve filtering efficiency, avoid long-term exposure and oxidation of samples, and ensure the accuracy of the experiment. In addition, a three-stage filtering unit is adopted, and the sample can be dehydrated and filtered three times in one operation, and the dehydration and filtration are more thorough, and the filtering operation does not need to be repeated, which can not only save time, but also avoid the experimenter from staying in front of the filtering device for a long time, so the personal safety of the experimenter can be ensured.

[0056] In other embodiments of the peroxide value detection pre-treatment device, calcium chloride or aluminum oxide may also be used as a desiccant.

[0057] In other embodiments of the peroxide value detection pre-treatment device, a compressor or a steam ejector may also be used as a vacuum extraction device.

[0058] In other embodiments of the peroxide value detection pre-treatment device, the telescopic device connected to the bottle cap may not be provided, and the bottle cap can be removed or installed manually.

[0059] In other embodiments of the peroxide value detection pretreatment equipment, a lifting device for supporting the liquid receiving bottle may not be provided, and the liquid receiving bottle is directly placed on the bottom plate and cannot be raised or lowered. At this time, in order to ensure the sealing of the connection between the liquid receiving bottle and the filtering device, a pad may be installed at the bottom of the liquid receiving bottle, or an elastic pad may be provided on the bottom plate. The elastic pad may be pressed down to put the liquid receiving bottle into the bottom plate. After releasing the hand, the liquid receiving bottle moves upward under the elastic force of the elastic pad and is sealed and docked with the filtering device.

[0060] In other embodiments of the peroxide value detection pretreatment equipment, the liquid storage bottle may also include only a bottle body and a bottle cap, and is no longer divided into an upper liquid storage bottle and a lower liquid storage bottle. In this case, the dissolution process of oil in the sample can be completed outside the equipment. During the experiment, the prepared sample can be directly added to the liquid storage bottle.

[0061] In other embodiments of the peroxide value detection pretreatment equipment, no joint is provided at the end of the filter device, and the tail connecting tube is directly connected to the liquid receiving bottle. At this time, a branch pipe can be provided on the liquid receiving bottle to form an interface connected to the vacuum device.

[0062] In other embodiments of the peroxide value detection pre-treatment device, the vacuum device may also be arranged outside the shell, and is not a part of the peroxide value detection pre-treatment device.

[0063] In other embodiments of the peroxide value detection pretreatment equipment, when multiple U-shaped filter tubes are arranged front and back and connected in sequence, the horizontal hydraulic support rod can be set as left and right hydraulic support rods, and the U-shaped filter tube is pulled out from the left or right side.

[0064] In other embodiments of the peroxide value detection pretreatment equipment, the upper and lower hydraulic support rods and the horizontal hydraulic support rods can also be replaced by air cylinders or hydraulic cylinders. In this case, a hydraulic system or a pneumatic system needs to be set up to control the movement of the air cylinder or the hydraulic cylinder.

[0065] In other embodiments of the peroxide value detection pretreatment equipment, a horizontal moving device may not be provided, and only an up and down moving device is connected to the U-shaped filter tube. In this case, the U-shaped filter tube cannot be pulled out to the outside, and the experimenter needs to reach under the shell to add desiccant into the U-shaped filter tube.

[0066] In other embodiments of the peroxide value detection pretreatment equipment, an up and down moving device may not be provided, and a shell does not need to be provided. The U-shaped filter tube and the corresponding connecting tube can be directly and manually sealed connected. When the connecting tube is removed, a desiccant can be added to the U-shaped filter tube. After the U-shaped filter tube and the corresponding connecting tube are manually and sealed connected, a sealed and connected filtering device can be formed.

[0067] In other embodiments of the peroxide value detection pre-treatment device, only two U-shaped filter tubes may be provided, and only two-stage filtration may be provided; four or more U-shaped filter tubes may also be provided.

[0068] In other embodiments of the peroxide value detection pretreatment equipment, the filter unit may not be a U-shaped filter tube, but an ordinary filter bottle with a bottle body and a bottle cap, and the desiccant is placed in the filter bottle. In this case, a liquid inlet pipe and a liquid outlet pipe need to be installed on the filter bottle.

Claims

1. Peroxide value detection pre-treatment equipment, characterized in that, include: Base; A liquid storage bottle is arranged on the base, and is used to store the sample to be filtered; A liquid receiving bottle is arranged on the base, and is used to receive the filtered sample; A filter device, the inlet of the filter device is connected to the liquid storage bottle, and the outlet is connected to the liquid receiving bottle. The filter device is used to hold a desiccant to remove water from the sample flowing through the filter device; The filtering device comprises at least two filter units connected in sequence and arranged on a base, so as to remove water from the sample at least twice; The end of the liquid receiving bottle or the filtering device close to the liquid receiving bottle is provided with an interface for connecting to a vacuum device, so that under the action of negative pressure, the sample to be filtered automatically flows from the liquid storage bottle through the filtering device and finally flows into the liquid receiving bottle. The filtering unit is a U-shaped filtering tube with the nozzle facing upward, and the U-shaped filtering tube is used to hold the desiccant. The base is provided with an up-and-down moving device for controlling the up-and-down movement of each U-shaped filtering tube; the base includes a bottom plate and a column fixed on the bottom plate, and a shell is fixed on the top of the column. The filtering device also includes connecting pipes respectively fixed on the shell for connecting the U-shaped filtering tube with the liquid storage bottle, the U-shaped filtering tube with the liquid receiving bottle, and two adjacent U-shaped filtering tubes. The U-shaped filtering tube has a docking station in the process of moving up and down, in which it seals and docks with the corresponding connecting pipe when moving upward to form a sealed and connected filtering device. The U-shaped filtering tube also has a separation station in which it separates from the corresponding connecting pipe when moving downward so as to load the desiccant into the U-shaped filtering tube.

2. The peroxide value detection pre-processing equipment according to claim 1, characterized in that: The peroxide value detection pretreatment equipment also includes a horizontal moving device for controlling the horizontal movement of each U-shaped filter tube. The horizontal moving device is connected to the up and down moving device and cooperates therewith, and is used to move the U-shaped filter tube horizontally to the outside of the base and the shell when the U-shaped filter tube is in the separation position, so as to load the desiccant into the U-shaped filter tube.

3. The peroxide value detection pre-processing equipment according to claim 2, characterized in that: The up and down moving device is an upper and lower hydraulic support rod whose bottom ends are fixed on the bottom plate. The horizontal moving device includes a horizontal moving plate and a horizontal hydraulic support rod installed on the horizontal moving plate. One end of the horizontal hydraulic support rod is fixed on the horizontal moving plate, and the other end is fixedly connected to the top ends of the upper and lower hydraulic support rods. A fixing structure for fixing the U-shaped filter tube is provided on the horizontal moving plate.

4. The peroxide value detection pre-treatment device according to any one of claims 1 to 3, characterized in that: The vacuum device is installed in the shell.

5. The peroxide value detection pre-treatment device according to any one of claims 1 to 3, characterized in that: A joint is provided on one end of the filtering device close to the liquid receiving bottle, and the joint includes an outer tube and an inner tube arranged inside the outer tube. One end of the outer tube and the inner tube is fixedly sealed, and the other end is spaced to form an annular space. The inner tube is used for allowing the sample to enter the liquid receiving bottle. A connecting pipe connected to the annular space is provided on the outer tube, and the interface is formed by the pipe mouth of the connecting pipe.

6. The peroxide value detection pre-treatment device according to any one of claims 1 to 3, characterized in that: The liquid storage bottle comprises an upper liquid storage bottle, a lower liquid storage bottle and a bottle cap. The upper liquid storage bottle and the lower liquid storage bottle are detachably connected together through a bottle mouth clamp. The bottle cap is installed on the top of the upper liquid storage bottle. A liquid storage bottle diaphragm is arranged in the upper liquid storage bottle. The lower liquid storage bottle is connected to a filtering device.

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