Chemical experiment test tube placing table

Abstract

The utility model discloses a chemical experiment test tube placing table, which relates to the technical field of experiment instruments, and comprises a table top, a test tube placing unit and a test tube cleaning unit, and the test tube placing unit comprises a water control tank, a rubber block, a support rod, a silica gel top block and a sponge ring. The test tube cleaning device is provided with the reliable test tube cleaning unit, test tubes after tests can be cleaned, waste water after cleaning can be collected, waste water containing chemical substances is prevented from emitting pungent smell, the reliable test tube placing unit is arranged, test tubes of different sizes and specifications can be effectively placed, and the test tube cleaning device is simple in structure, convenient to use and high in practicability. The test tubes are reversely inserted in the supporting rods after being cleaned, so that the test tubes are automatically subjected to water control and drying when placed, the silica gel top blocks and the rubber blocks support the tails and ports of the test tubes correspondingly, the sponge rings are inserted into the test tubes, the test tubes can be tightly supported and fixed, the openings of the test tubes are blocked, dust is prevented from entering the test tubes, and the service life of the test tubes is prolonged. And the cleanliness of the test tubes during taking is ensured.

Description

Technical Field

[0001] The utility model relates to the technical field of experimental instruments, in particular to a chemical experiment test tube placement table. Background Art

[0002] Test tubes are commonly used instruments in chemical laboratories. They are used as reaction containers for small amounts of reagents and are used at room temperature or when heated. After each experimental operation, the test tubes need to be cleaned and placed stably for the next use. Laboratories often use a dedicated placement table to place test tubes of various specifications.

[0003] The chemical experiment test tube placement table in the prior art lacks the collection and management of cleaning wastewater. The chemical substances in the wastewater will emit a pungent odor. In addition, the existing test tube placement table can only simply hold the test tubes, lacks the effect of fixing the test tubes, and external dust can easily enter the inside of the test tubes, resulting in the need to clean them before use next time. For this reason, we propose a chemical experiment test tube placement table. Utility Model Content

[0004] The technical problem to be solved by the utility model is to overcome the existing defects and provide a chemical experiment test tube placement table with a reliable test tube cleaning unit, which can clean the test tubes after the test and collect the waste water after cleaning to prevent the waste water containing chemical substances from emitting irritating odors. The utility model also has a reliable test tube placement unit, which can effectively place test tubes of different sizes. After the test tubes are cleaned, they are inverted and inserted at the support rods so that they can control water and dry themselves when placed. The silicone top block and the rubber block respectively support the tail and the port of the test tube. The sponge ring is inserted into the interior of the test tube, and the elasticity of the sponge can tighten and fix the test tube to prevent the test tube from shaking. The sponge ring can seal the test tube mouth while allowing water from the inner wall of the test tube to flow down to prevent dust from entering the interior of the test tube, thereby ensuring the cleanliness of the test tube when it is taken out. The problems in the background technology can be effectively solved.

[0005] In order to achieve the above purpose, the utility model provides the following technical solutions:

[0006] A chemical experiment test tube placement table, comprising a table, a test tube placement unit and a test tube cleaning unit; the test tube placement unit and the test tube cleaning unit are both located on the table;

[0007] Table: The left and right sides and the rear side of the lower end are fixedly connected with vertical support plates;

[0008] Test tube placement unit: comprising a water control tank, a rubber block, a support rod, a silicone top block and a sponge ring. A square water control tank is provided on the left side of the upper end of the table. A rubber block is installed inside the water control tank. The upper end of each rubber block is fixedly connected to a support rod. The height of each row of support rods increases equidistantly from the front to the back. The upper end of the support rod is fixedly connected to a hemispherical silicone top block. A sponge ring is fixedly set on the outer side of the circumference of the support rod.

[0009] The test tube cleaning unit comprises a cleaning pool, a U-shaped water pipe, and a waste water tank; the U-shaped water pipe is located above the cleaning pool, and the waste water tank is connected to the cleaning pool through a downpipe.

[0010] The support plate is used to support the table. The test tube cleaning unit is used to clean the test tubes after the test and collect the waste water after cleaning to prevent the waste water containing chemical substances from emitting irritating odor. The water control tank is used to control the water of the cleaned test tubes so that they can dry naturally when placed. After the test tubes are cleaned, they are inverted and inserted into the support rod. The silicone top block at the top of the support rod supports the tail of the test tube. The lower end of the inverted test tube is against the upper end of the rubber block. The sponge ring is inserted into the inside of the test tube, and through the elasticity of the sponge, it can tighten and fix the test tube to prevent the test tube from shaking. The sponge ring can seal the mouth of the test tube while allowing water from the inner wall of the test tube to flow down to prevent dust from entering the inside of the test tube, thereby ensuring the cleanliness of the test tube when it is taken.

[0011] Furthermore, the test tube cleaning unit comprises a cleaning pool, a mounting seat, a U-shaped water pipe, a groove and a downpipe. A cleaning pool is provided on the left side of the table. Two left and right mounting seats are installed at the upper end of the rear side wall of the cleaning pool. Two U-shaped water pipes, one high and one low, are installed on the two mounting seats respectively. The bottom of the cleaning pool is a funnel-shaped circular groove. A downpipe is fixedly connected to the lower end of the cleaning pool. The upper end of the downpipe is connected to the bottom port of the groove. The cleaning pool is used to provide a place for cleaning test tubes. The mounting seat is used for the installation of the U-shaped water pipe. The front port of the U-shaped water pipe discharges water vertically downward. The U-shaped water pipe, one high and one low, can be conveniently selected by the experimenter according to the size of the test tube. The funnel-shaped groove can facilitate the collection of cleaning wastewater in the pool. The downpipe passes the collected wastewater downward into the wastewater tank.

[0012] Furthermore, the test tube cleaning unit also includes a wastewater tank and a movable closing block. The wastewater tank is arranged on the left side of the lower end of the table. The wastewater tank is a square structure and has a circular through hole at the upper end. The lower end of the sewer pipe is flush with the upper end of the wastewater tank, and the size of the lower end of the sewer pipe is smaller than the size of the circular through hole at the upper end of the wastewater tank. The movable closing block is a two-stage circular structure and is slidably sleeved on the outer side of the sewer pipe. The upper end of the movable closing block is attached to and sealed at the circular through hole at the upper end of the wastewater tank. The movable closing block can slide up and down along the sewer pipe. The movable closing block in a natural state is attached to and sealed at the upper end of the wastewater tank, which prevents the wastewater from emitting irritating odors. The movable closing block can be lifted upward, so as to facilitate the extraction of the wastewater tank from the support frame to process and dump the collected wastewater.

[0013] Furthermore, the test tube cleaning unit further comprises a support frame and a hand buckle groove, a U-shaped support frame is fixedly connected to the left front position of the rear support plate, the waste water tank is installed inside the support frame and can slide forward and backward along the support frame, and hand buckle grooves are provided on both sides of the waste water tank. The support frame is used for installing the waste water tank, and enables the waste water tank to slide forward and backward along the support frame, and the hand buckle grooves on both sides can facilitate personnel to lift and move the waste water tank.

[0014] Furthermore, the test tube placement unit further comprises a water leakage hole and an internal channel, a plurality of water leakage holes are arranged in an array at the bottom of the water control tank, an internal channel is arranged at the lower side of the water control tank, and the internal channel faces left and is connected to the cleaning tank. After cleaning, the test tube is placed upside down for water control, and the falling water drops fall down along the water leakage hole into the internal channel and enter the cleaning tank on the left, and are collected into the wastewater tank together with the cleaning wastewater.

[0015] Furthermore, it also includes a mounting groove and a baffle. A longitudinal mounting groove is provided on the lower left side of the table. The mounting groove corresponds longitudinally to the lower end of the groove, and a baffle is slidably connected inside the mounting groove. The rear end of the baffle covers the lower end of the groove, and a finger slot is provided at the front end of the baffle. The mounting groove is used for installing the baffle. By pulling the baffle, the opening and closing of the lower end of the groove for water leakage can be controlled, so that the lower end of the water leakage can be closed after cleaning to prevent wastewater containing chemical substances from emitting irritating gases.

[0016] Compared with the prior art, the beneficial effects of the utility model are:

[0017] The utility model provides a chemical experiment test tube placement table, which has the following advantages:

[0018] 1. It has a reliable test tube placement unit, which can effectively place test tubes of different sizes. After cleaning, the test tube is inverted and inserted into the support rod, so that it can control water and dry itself when placed. The silicone top block and rubber block support the tail and port of the test tube respectively. The sponge ring is inserted into the inside of the test tube, and through the elasticity of the sponge, it can tighten and fix the test tube to prevent the test tube from shaking. The sponge ring can seal the test tube mouth while allowing the water on the inner wall of the test tube to flow down, preventing dust from entering the inside of the test tube, ensuring the cleanliness of the test tube when it is taken out;

[0019] 2. It has a reliable test tube cleaning unit, which can clean the test tubes after the test and collect the waste water after cleaning, preventing the waste water containing chemical substances from emitting pungent odor, protecting a good experimental environment and the health of the experimenters;

[0020] 3. The utility model has a reliable test tube cleaning unit, which can clean the test tube after the test and collect the waste water after cleaning to prevent the waste water containing chemical substances from emitting irritating odor. It also has a reliable test tube placement unit, which can effectively place test tubes of different sizes. After cleaning, the test tube is inverted and inserted at the support rod so that it can control water and dry itself when placed. The silicone top block and the rubber block support the tail and the port of the test tube respectively. The sponge ring is inserted into the inside of the test tube, and through the elasticity of the sponge, it can tighten and fix the test tube to prevent the test tube from shaking. The sponge ring can seal the test tube mouth while allowing the water on the inner wall of the test tube to flow down to prevent dust from entering the inside of the test tube, thereby ensuring the cleanliness of the test tube when it is taken out. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 This is a three-dimensional structural schematic diagram of a chemical experiment test tube placement table of the utility model;

[0022] Figure 2 This is a schematic diagram of a chemical experiment test tube placement table from an upper side perspective of the utility model;

[0023] Figure 3 The utility model is a partial structural schematic diagram of a chemical experiment test tube placement table.

[0024] The numbers in the figure are:

[0025] 1 table, 2 support plate, 3 test tube placement unit, 31 water control sink, 32 rubber block, 33 support rod, 34 silicone top block, 35 sponge ring, 36 leakage hole, 37 internal channel, 4 test tube cleaning unit, 41 cleaning tank, 42 ​​mounting seat, 43 U-shaped water pipe, 44 groove, 45 drain pipe, 46 waste water tank, 47 movable closing block, 48 support bracket, 49 hand buckle slot, 5 mounting slot, 6 baffle. DETAILED DESCRIPTION

[0026] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0027] See also Figure 1-Figure 3 , this embodiment provides a technical solution:

[0028] A chemical experiment test tube placement table comprises a table 1, a test tube placement unit 3 and a test tube cleaning unit 4; the test tube placement unit 3 and the test tube cleaning unit 4 are both located on the table 1.

[0029] Table 1: Vertical support plates 2 are fixedly connected to the left and right sides and the rear side of the lower end.

[0030] The test tube placement unit 3 comprises a water control tank 31, a rubber block 32, a support rod 33, a silicone top block 34 and a sponge ring 35. A square water control tank 31 is provided on the left side of the upper end of the table 1. The interior of the water control tank 31 is provided with four rows and three columns of rubber blocks 32 in a rectangular array. The upper end of each rubber block 32 is fixedly connected to a support rod 33. The height of each row of support rods 33 increases equidistantly from the front to the back. The upper end of the support rod 33 is fixedly connected to a hemispherical silicone top block 34. A sponge ring 35 is fixedly mounted on the outer side of the circumference of the support rod 33.

[0031] Test tube cleaning unit 4: installed on the right and lower side of table 1, test tube cleaning unit 4 comprises a cleaning pool 41, a U-shaped water pipe 43, and a waste water tank 46; the U-shaped water pipe 43 is located above the cleaning pool 41, and the waste water tank 46 is connected to the cleaning pool 41 through a downpipe 45.

[0032] The support plate 2 supports the table 1. The test tube cleaning unit 4 is used to clean the test tube after the test and collect the waste water after cleaning to prevent the waste water containing chemical substances from emitting irritating odor. The water control tank 31 is used to control the water of the cleaned test tube so that it can dry naturally when placed. After the test tube is cleaned, it is inverted and inserted into the support rod 33. The silicone top block 34 at the top of the support rod 33 supports the tail of the test tube. The lower end of the inverted test tube is against the upper end of the rubber block 32. The sponge ring 35 is inserted into the inside of the test tube, and through the elasticity of the sponge, it can tighten and fix the test tube to prevent the test tube from shaking. The sponge ring 35 can seal the test tube mouth while allowing the water on the inner wall of the test tube to flow down to prevent dust from entering the inside of the test tube, thereby ensuring the cleanliness of the test tube when it is taken.

[0033] The sponge ring 35 is cylindrical and is sleeved around the outer periphery of the slender support rod 33 ; and the sponge ring 35 is made of water-absorbing sponge.

[0034] like Figure 1 As shown, the test tube cleaning unit 4 comprises a cleaning pool 41, a mounting seat 42, a U-shaped water pipe 43, a groove 44 and a downpipe 45. The cleaning pool 41 is provided on the left side of the table 1. Two left and right mounting seats 42 are mounted on the upper end of the rear side wall of the cleaning pool 41. Two U-shaped water pipes 43, one high and one low, are mounted on the two mounting seats 42 respectively. The bottom of the cleaning pool 41 is a funnel-shaped circular groove 44. A downpipe 45 is fixedly connected to the lower end of the cleaning pool 41. The upper end of the downpipe 45 is connected to the bottom port of the groove 44. The cleaning pool 41 is used to provide a place for cleaning the test tube. The mounting seat 42 is used for the installation of the U-shaped water pipe 43. The front port of the U-shaped water pipe 43 discharges water vertically downward. The U-shaped water pipe 43, one high and one low, can be conveniently selected by the experimenter according to the size of the test tube. The funnel-shaped groove 44 can facilitate the collection of the cleaning wastewater in the pool. The downpipe 45 passes the collected wastewater downward into the wastewater tank 46.

[0035] The waste water tank 46 is used to collect waste water, and the waste water tank 46 is made of corrosion-resistant and low chemically active material.

[0036] The test tube cleaning unit 4 also includes a waste water tank 46 and a movable closing block 47. The waste water tank 46 is arranged on the left side of the lower end of the table 1. The waste water tank 46 is a square structure and has a circular through hole at the upper end. The lower end of the downpipe 45 is flush with the upper end of the waste water tank 46, and the size of the lower end of the downpipe 45 is smaller than the size of the circular through hole at the upper end of the waste water tank 46. The movable closing block 47 is a two-stage circular structure and is slidably sleeved on the outer side of the downpipe 45. The upper end of the movable closing block 47 is attached to and sealed at the circular through hole at the upper end of the waste water tank 46. The movable closing block 47 can slide up and down along the downpipe 45. The movable closing block 47 in the natural state is attached to and sealed at the upper end of the waste water tank 46, which prevents the waste water from emitting pungent odors. The movable closing block 47 can be lifted upward, so as to facilitate the extraction of the waste water tank 46 from the support frame 48 to process and dump the collected waste water.

[0037] The test tube cleaning unit 4 also includes a support frame 48 and a hand buckle groove 49. A U-shaped support frame 48 is fixedly connected to the left front position of the rear support plate 2. The waste water tank 46 is installed inside the support frame 48 and can slide forward and backward along the support frame 48. Hand buckle grooves 49 are provided on both sides of the waste water tank 46. The support frame 48 is used to install the waste water tank 46, and enables the waste water tank 46 to slide forward and backward along the support frame 48. The hand buckle grooves 49 on both sides can facilitate personnel to lift and move the waste water tank 46.

[0038] like Figure 2As shown, the test tube placement unit 3 further includes a water leakage hole 36 and an internal channel 37. A plurality of water leakage holes 36 are arranged in an array at the bottom of the water control tank 31. An internal channel 37 is arranged at the lower side of the water control tank 31. The internal channel 37 faces left and is connected to the cleaning tank 41. The cleaned test tube is placed upside down for water control. The falling water drops fall down along the water leakage hole 36 into the internal channel 37 and enter the cleaning tank 41 on the left, and are collected into the wastewater tank 46 together with the cleaning wastewater.

[0039] like Figure 1 As shown, the table 1 also includes a mounting groove 5 and a baffle 6. A longitudinal mounting groove 5 is provided on the lower left side of the table 1. The mounting groove 5 corresponds to the lower end of the groove 44 in a longitudinal direction. A baffle 6 is slidably connected inside the mounting groove 5. The rear end of the baffle 6 covers the lower end of the groove 44. A finger slot is provided at the front end of the baffle 6. The mounting groove 5 is connected to the lower end of the groove 44. The baffle 6 of the mounting groove 5 can be pulled and moved in the mounting groove 5. By pulling and pulling the baffle 6, the lower end of the groove 44 can be closed. Therefore, after cleaning, the lower end of the groove 44 can be closed, thereby realizing the closure of the top of the sewer pipe 45 to prevent the wastewater containing chemical substances from emitting irritating gases.

[0040] The working principle of a chemical experiment test tube placement table provided by the utility model is as follows:

[0041] The test tube placement table is provided with a reliable test tube cleaning unit 4, which can clean the test tubes after the test and collect the waste water after the cleaning, thereby preventing the waste water containing chemical substances from emitting irritating odor.

[0042] The cleaning pool 41 is used to provide a place for cleaning test tubes, and the mounting seat 42 is used to install a U-shaped water pipe 43. The front end of the U-shaped water pipe 43 discharges water vertically downward, and the high and low U-shaped water pipes 43 can be conveniently selected by experimenters according to the size of the test tubes. The funnel-shaped groove 44 can facilitate the collection of cleaning waste water in the pool, and the downpipe 45 will pass the collected waste water downward into the wastewater tank 46.

[0043] The movable closing block 47 can slide up and down along the sewer pipe 45. In the natural state, the movable closing block 47 fits and seals the upper end of the waste water tank 46 to prevent the waste water from emitting a pungent odor. The movable closing block 47 can be lifted upward to facilitate the removal of the waste water tank 46 from the support bracket 48 to process and dump the collected waste water.

[0044] The support bracket 48 is used for installing the waste water tank 46 , and enables the waste water tank 46 to slide forward and backward along the support bracket 48 , and the hand buckle grooves 49 on both sides can facilitate personnel to lift and move the waste water tank 46 .

[0045] The mounting groove 5 is used for installing the baffle 6. By pulling the baffle 6, the opening and closing of the groove 44 for the leaking lower port can be controlled, so that the leaking lower port can be closed after cleaning to prevent waste water containing chemical substances from emitting irritating gases.

[0046] The test tube placement table also has a reliable test tube placement unit 3, which can effectively place test tubes of different sizes. After the test tubes are cleaned, they are inverted and inserted into the support rod 33, so that they can control water and dry themselves when placed. The silicone top block 34 and the rubber block 32 support the tail and the port of the test tube respectively.

[0047] The sponge ring 35 is inserted into the interior of the test tube, and through the elasticity of the sponge, it can tighten and fix the test tube to prevent the test tube from shaking. The sponge ring 35 can seal the test tube mouth while allowing water on the inner wall of the test tube to flow down, preventing dust from entering the interior of the test tube, thereby ensuring the cleanliness of the test tube when it is taken out.

[0048] The bottom array of the water control tank 31 is provided with a plurality of leakage holes 36. The cleaned test tubes are placed upside down for water control. The falling water drops fall down along the leakage holes 36 into the internal channel 37 and flow into the cleaning pool 41 on the left, and flow into the wastewater tank 46 together with the cleaning wastewater.

[0049] When a chemical experiment is completed in a test tube, there are usually chemical reagents or solutions left in the test tube. The chemical reagents or solutions need to be collected harmlessly and the test tube needs to be cleaned at the same time.

[0050] At this time, the residual chemical reagent or solution in the test tube can be poured into the cleaning tank 41, and the inside and outside of the test tube can be rinsed by the clean water flowing out of the U-shaped water pipe 43 to clean the test tube. The waste water in the cleaning tank 41 flows into the waste water tank 46 through the downpipe 45 to be collected.

[0051] After the test tube is cleaned, there will be residual water droplets inside. At this time, the test tube can be turned upside down, that is, placed on the support rod 33 with the opening facing downward.

[0052] During the insertion process, the hemispherical silicone top block 34 can guide and align the insertion of the test tube. The opening of the test tube passes through the sponge ring 35, which blocks the opening of the test tube to prevent dust from entering the test tube and allows the water droplets in the test tube to flow out under the action of gravity. The falling water droplets fall into the internal channel 37 through the water control tank 31 and the water leakage hole 36, and then flow into the cleaning pool 41 on the left, and flow into the wastewater tank 46 together with the cleaning wastewater to achieve collection.

[0053] The above description is only an embodiment of the present invention, and does not limit the patent scope of the present invention. Any equivalent structure or equivalent process transformation made by using the contents of the specification and drawings of the present invention, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present invention.

Claims

1. A chemical experiment test tube placement table, characterized in that: It comprises a table (1), a test tube placement unit (3) and a test tube cleaning unit (4); the test tube placement unit (3) and the test tube cleaning unit (4) are both located on the table (1); Table (1): vertical support plates (2) are fixedly connected to the left and right sides and the rear side of the lower end; The test tube placement unit (3) comprises a water control tank (31), a rubber block (32), a support rod (33), a silicone top block (34) and a sponge ring (35). The upper end of the table (1) is provided with a water control tank (31), and a rubber block (32) is installed inside the water control tank (31). The upper end of each rubber block (32) is fixedly connected to a support rod (33). The height of each row of support rods (33) increases equidistantly from the front to the back. The upper end of the support rod (33) is fixedly connected to a hemispherical silicone top block (34), and a sponge ring (35) is fixedly mounted on the outer side of the circumference of the support rod (33). The test tube cleaning unit (4) comprises a cleaning pool (41), a U-shaped water pipe (43), and a waste water tank (46); the U-shaped water pipe (43) is located above the cleaning pool (41), and the waste water tank (46) is connected to the cleaning pool (41) through a downpipe (45).

2. A chemical experiment test tube placement table according to claim 1, characterized in that: The test tube cleaning unit (4) further comprises a mounting seat (42) and a groove (44); a cleaning pool (41) is provided on the left side of the table (1); two left and right mounting seats (42) are installed at the upper end of the rear side wall of the cleaning pool (41); two U-shaped water pipes (43) are installed on the two mounting seats (42), one high and one low; the bottom of the cleaning pool (41) is a funnel-shaped circular groove (44); a downpipe (45) is fixedly connected to the lower end of the cleaning pool (41); the upper end of the downpipe (45) is connected to the bottom port of the groove (44).

3. A chemical experiment test tube placement table according to claim 2, characterized in that: The test tube cleaning unit (4) further comprises a movable closing block (47). A waste water tank (46) is arranged on the left side of the lower end of the table (1). The waste water tank (46) is of a square structure and has a circular through hole at the upper end. The lower end of the downpipe (45) is flush with the upper end of the waste water tank (46), and the size of the lower end of the downpipe (45) is smaller than the size of the circular through hole at the upper end of the waste water tank (46). The movable closing block (47) is of a two-stage circular structure and is slidably sleeved on the outer side of the downpipe (45). The upper end of the movable closing block (47) is attached to and sealed at the circular through hole at the upper end of the waste water tank (46).

4. A chemical experiment test tube placement table according to claim 3, characterized in that: The test tube cleaning unit (4) further comprises a support frame (48) and a hand buckle groove (49); a U-shaped support frame (48) is fixedly connected to the left front position of the rear support plate (2); the waste water tank (46) is installed inside the support frame (48) and can slide forward and backward along the support frame (48); and hand buckle grooves (49) are provided on both left and right sides of the waste water tank (46).

5. A chemical experiment test tube placement table according to any one of claims 1 to 4, characterized in that: The test tube placement unit (3) further comprises a water leakage hole (36) and an internal channel (37); a plurality of water leakage holes (36) are arranged in an array at the bottom of the water control tank (31); an internal channel (37) is arranged at the lower side of the water control tank (31); the internal channel (37) faces leftward and is connected to the cleaning tank (41).

6. A chemical experiment test tube placement table according to claim 5, characterized in that: The table (1) further comprises a mounting groove (5) and a baffle (6); a longitudinal mounting groove (5) is provided on the lower left side of the table (1); the mounting groove (5) corresponds longitudinally to the lower end of the groove (44); a baffle (6) is slidably connected inside the mounting groove (5); the rear end of the baffle (6) covers the lower end of the groove (44); and a finger slot is provided at the front end of the baffle (6).

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