A weight rod for a testing instrument and a testing instrument

Abstract

The present invention relates to a weight rod for a testing instrument and a testing instrument. The weight rod for the testing instrument comprises a housing and a main rod: the housing extends vertically, and an opening is provided at the upper end thereof; the main rod is inserted inside the housing and is in vertical guiding and sliding fit with the housing. The upper end of the main rod extends out of the housing and is used for connecting with the lower end of the testing instrument body. A clamping hole is provided on the housing; a clamping block is arranged on the main rod; a spring for pressing against the clamping block is arranged on the main rod; the clamping block has a clamping state for relatively fixing the main rod and the housing, and also has an unlocking state for enabling the main rod and the housing to slide relatively vertically; the lower end of the main rod is in vertical stop fit with the housing when the clamping block is in the unlocking state. The weight rod for the testing instrument of the present invention makes the weight rod loosen from the well wall through the impact force between the main rod and the housing, and solves the problem that the existing weight rod is not easily pulled out when stuck in the well.

Description

Technical Field

[0001] The invention relates to a weighted rod for a testing instrument and the testing instrument, belonging to the field of testing instrument salvage. Background Art

[0002] During the pressure test of oil and water wells, in order to overcome the pressure in the well and ensure the smooth lowering of the test instrument, it is usually necessary to add weight to the test instrument. The most common method is to connect the weight rod to the bottom of the test instrument through a thread. Due to the complex situation in the well, the weight rod is easy to get stuck in the well. After the weight rod is stuck, the test instrument is usually pulled hard with a wire rope. This process can easily cause the wire rope to be broken and the test instrument to fall into the well. Summary of the invention

[0003] The purpose of the present invention is to provide a weighted rod for a testing instrument, so as to solve the problem that the existing weighted rod is difficult to be pulled out when stuck in a well. The present invention also provides a testing instrument using the weighted rod.

[0004] The technical solution of the weighted rod for the testing instrument of the present invention is:

[0005] The weighting rod for the test instrument comprises a shell and a main rod: the shell extends up and down and is provided with an opening at the upper end; the main rod is inserted into the shell and slides with the upper and lower guides of the shell, the upper end of the main rod extends out of the shell and is used to connect with the lower end of the test instrument body, and a clamping hole is provided on the shell; a clamping block is swingably arranged on the main rod, and the clamping block comprises a stopper surface for upper and lower stoppering with the upper hole wall of the clamping hole and a stopper portion for stoppering with the inner wall of the shell; a spring is provided on the main rod for top pressurizing with the clamping block;

[0006] The card block has a clamping state in which the main rod and the shell are relatively fixed, and also has an unlocking state in which the main rod and the shell can slide relatively up and down; when the card block is in the clamping state, the spring presses the card block so that the blocking surface of the card block is in the clamping hole, and the blocking surface of the card block gradually tilts downward in the horizontal direction from the inside of the shell to the outside of the shell, and is blocked with the upper hole wall of the card hole, and the blocking part of the card block is blocked with the inner wall of the shell; when the card block is in the unlocking state, the card block is outside the card hole; the lower end of the main rod is blocked with the upper and lower shells when the card block is in the unlocking state;

[0007] When the weighting rod is stuck in the well and the blocking block is in a stuck state, the pulling force on the main rod is increased until the reaction force of the upper hole wall of the blocking hole facing the stop surface of the blocking block causes the blocking block to overcome the elastic force of the spring on the blocking block, and the blocking block swings in the direction of disengaging from the blocking hole to an unlocked state, and the main rod is continued to be pulled to make it slide upward relative to the shell, and the lower end of the main rod collides with the shell.

[0008] Beneficial effects: When the weight rod for the testing instrument of the present invention is stuck in the well, the testing instrument is pulled by a steel wire rope to apply a tensile force to the main rod of the weight rod, increasing the tensile force on the main rod. When the reaction force of the upper hole wall surface of the card hole against the stop surface of the card block is greater than the elastic force of the spring on the card block, the card block swings towards the direction of disengaging from the card hole to the unlocked state. At this time, the main rod and the housing can slide relative to each other. Continuing to pull the steel wire rope to apply a tensile force to the main rod, the main rod slides rapidly upward relative to the housing, and the impact force generated between the lower end of the main rod and the housing causes the weight rod to become loose from the well wall, and the weight rod can be pulled out of the well. The weight rod for the testing instrument of the present invention makes the weight rod become loose from the well wall through the impact force between the main rod and the housing, solving the problem that the existing weight rod is not easily pulled out when stuck in the well.

[0009] Furthermore, there is an insertion port at the lower end of the housing for the main rod to be inserted from bottom to top, and a plug is provided at the insertion port of the housing. The plug is used to block the insertion port of the housing, and the plug is detachably connected to the lower end of the housing.

[0010] Beneficial effects: The plug blocks the insertion port, reducing the risk of the main rod sliding out from the insertion port.

[0011] Furthermore, a gas passage is provided on the plug, and the gas passage is used to connect the outside with the inside of the housing.

[0012] Beneficial effects: When the main rod and the housing slide relative to each other rapidly, a suction effect will be generated. The suction effect will reduce the impact force between the main rod and the housing. The setting of the gas passage reduces the suction effect, and thus reduces the adverse impact of the suction effect on the impact force between the main rod and the housing.

[0013] Furthermore, a threaded adjusting member for adjusting the compression amount of the spring is threadedly connected to the main rod, and the threaded adjusting member is in top pressure fit with the spring.

[0014] Beneficial effects: The setting of the threaded adjusting member can adjust the compression amount of the spring by screwing the threaded adjusting member, thereby adjusting the elastic force of the spring on the card block.

[0015] Furthermore, the threaded adjusting member is a setscrew, one end of the spring is wound and fixed with the setscrew, and the other end is in top pressure fit with the card block.

[0016] Beneficial effects: The setting of the fixed spring and setscrew can reduce the risk of the spring and setscrew becoming loose and the spring being lost.

[0017] Furthermore, the card hole is a perforation penetrating the housing.

[0018] Beneficial effects: The card hole adopts the structural form of a perforation, and the card block can be manually pressed through the card hole to make the card block in the unlocked state, and the main rod can be pulled out from above the housing, facilitating the inspection and maintenance of the weight rod.

[0019] Further, the card holes are arranged in pairs. When one of the two card holes in a pair is in clamping fit with the card block, the other card hole is aligned with the threaded adjusting member so that the adjusting tool can extend into it to adjust the threaded adjusting member.

[0020] Beneficial effect: Such an arrangement makes the adjustment of the setscrew more convenient.

[0021] Further, a chute extending vertically along the extending direction of the housing is provided on the inner wall surface of the housing. A slider is provided at the lower end of the main rod. The slider is in sliding fit with the chute, and the slider is used to be in blocking fit with the upper chute wall when the card block is in the unlocked state to cause the lower end of the main rod to impact with the housing.

[0022] Beneficial effect: The housing and the main rod are arranged in a guiding sliding fit with the chute and the slider, with a simple structure and convenient processing.

[0023] Further, a connecting head is provided at the upper end of the main rod. The connecting head is used for detachably connecting with the testing instrument, and the connecting head is detachably connected with the main rod.

[0024] Beneficial effect: The setting of the connecting head facilitates the connection between the weighting rod and the testing instrument body and also facilitates the replacement of the weighting rod.

[0025] The technical solution of the testing instrument of the present invention is as follows:

[0026] The testing instrument includes a testing instrument body and a weighting rod. The weighting rod is connected to the lower end of the testing instrument body;

[0027] The weighting rod includes a housing and a main rod: The housing extends vertically and has an opening at the upper end; The main rod is inserted inside the housing and is in vertical guiding sliding fit with the housing. The upper end of the main rod extends out of the housing and is connected to the lower end of the testing instrument body. Card holes are provided on the housing; A card block is swingably arranged on the main rod. The card block includes a blocking surface for vertically blocking and cooperating with the upper hole wall surface of the card hole and a blocking portion for blocking and cooperating with the inner wall surface of the housing; A spring for pressing against the card block is provided on the main rod;

[0028] The card block has a clamping state in which the main rod and the housing are relatively fixed, and also has an unlocked state in which the main rod and the housing can slide vertically relative to each other; When the card block is in the clamping state, the spring presses against the card block so that the blocking surface of the card block is inside the card hole. The blocking surface of the card block gradually slopes downward in the horizontal direction from inside the housing to outside the housing and is in blocking fit with the upper hole wall surface of the card hole. The blocking portion of the card block is in blocking fit with the inner wall surface of the housing; When the card block is in the unlocked state, the card block is outside the card hole; The lower end of the main rod is in vertical blocking fit with the housing when the card block is in the unlocked state;

[0029] When the weight rod is stuck in the well and the locking block is in the locked state, increase the pulling force on the main rod until the reaction force of the upper hole wall surface of the card hole against the blocking surface of the locking block causes the locking block to overcome the elastic force of the spring on the locking block, and the locking block swings towards the direction of disengaging from the card hole to the unlocked state. Continue to pull the main rod to make the main rod slide upward relative to the housing, and the lower end of the main rod impacts the housing.

[0030] Beneficial effects: When the weight rod of the testing instrument of the present invention is stuck in the well, the testing instrument is pulled by a wire rope to apply a pulling force on the main rod of the weight rod, and the pulling force on the main rod is increased. When the reaction force of the upper hole wall surface of the card hole against the blocking surface of the locking block is greater than the elastic force of the spring on the locking block, the locking block swings towards the direction of disengaging from the card hole to the unlocked state. At this time, the main rod and the housing can slide relative to each other. Continue to pull the wire rope to apply a pulling force on the main rod, and the main rod slides upward rapidly relative to the housing. The impact force generated by the lower end of the main rod and the housing loosens the weight rod from the well wall, and the weight rod can be pulled out of the well. The weight rod of the testing instrument of the present invention loosens the weight rod from the well wall through the impact force between the main rod and the housing, and solves the problem that the existing weight rod is not easily pulled out when it is stuck in the well.

[0031] Further, there is an insertion port at the lower end of the housing for the main rod to be inserted from bottom to top, and a plug is provided at the insertion port of the housing. The plug is used to block the insertion port of the housing, and the plug is detachably connected to the lower end of the housing.

[0032] Beneficial effects: The plug blocks the insertion port, reducing the risk of the main rod sliding out from the insertion port.

[0033] Further, a gas passage is provided on the plug, and the gas passage is used to connect the outside and the inside of the housing.

[0034] Beneficial effects: When the main rod and the housing slide relative to each other rapidly, a suction effect will be generated. The suction effect will reduce the impact force between the main rod and the housing. The setting of the gas passage reduces the suction effect, and thus reduces the adverse impact of the suction effect on the impact force between the main rod and the housing.

[0035] Further, a threaded adjusting member for adjusting the compression amount of the spring is threadedly connected to the main rod, and the threaded adjusting member is in top pressure fit with the spring.

[0036] Beneficial effects: The setting of the threaded adjusting member can adjust the compression amount of the spring by screwing the threaded adjusting member, so as to adjust the elastic force of the spring on the locking block.

[0037] Further, the threaded adjusting member is a set screw, one end of the spring is wound and fixed with the set screw, and the other end is in top pressure fit with the locking block.

[0038] Beneficial effects: The setting of the fixed connection between the spring and the set screw can reduce the risk of the spring and the set screw loosening and the spring being lost.

[0039] Furthermore, the card hole is a perforation that penetrates the housing.

[0040] Beneficial effects: The card hole adopts a perforated structure form, which can manually press the card block through the card hole to make the card block in the unlocked state, and pull out the main rod from above the housing, facilitating the inspection and maintenance of the weight rod.

[0041] Furthermore, the card holes are arranged in pairs. When one of the two paired card holes is in clamping fit with the card block, the other card hole is directly opposite to the threaded adjusting member so that the adjusting tool can extend in to adjust the threaded adjusting member.

[0042] Beneficial effects: This setting makes the adjustment of the setscrew more convenient.

[0043] Furthermore, a sliding groove extending up and down along the extending direction of the housing is provided on the inner wall surface of the housing. A sliding block is provided at the lower end of the main rod. The sliding block is in sliding fit with the sliding groove, and the sliding block is used to be in blocking fit with the upper groove wall of the sliding groove when the card block is in the unlocked state to realize the impact between the lower end of the main rod and the housing.

[0044] Beneficial effects: The housing and the main rod adopt the setting of guiding sliding fit of the sliding groove and the sliding block, with simple structure and convenient processing.

[0045] Furthermore, a connecting head is provided at the upper end of the main rod. The connecting head is used for detachable connection with the test instrument, and the connecting head is detachably connected with the main rod.

[0046] Beneficial effects: The setting of the connecting head facilitates the connection between the weight rod and the test instrument body and also facilitates the replacement of the weight rod. Description of the Drawings

[0047] Figure 1 is the assembly drawing of the weight rod for the test instrument of the present invention;

[0048] Figure 2 is the exploded view of the weight rod for the test instrument of the present invention;

[0049] Figure 3 is Figure 2 the sectional view taken along line A-A of

[0050] Figure 4 is Figure 2 the sectional view taken along line B-B of

[0051] In the figure: 1, housing; 2, main rod; 3, plug; 4, card hole; 5, card block; 501, stop surface; 502, stop portion; 6, card block installation groove; 7, pin; 8, spring; 9, setscrew; 10, connecting head; 11, sliding groove; 12, sliding block; 13, gas passage; 131, longitudinal air passage; 132, transverse air passage. Detailed Embodiments

[0052] In order to make the objectives, technical solutions and advantages of the present invention more clear, the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention, that is, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. The components of the embodiments of the present invention usually described and shown in the drawings here can be arranged and designed in various different configurations.

[0053] Therefore, the following detailed description of the embodiments of the present invention provided in the drawings is not intended to limit the scope of the claimed invention, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative efforts fall within the scope of protection of the present invention.

[0054] It should be noted that relational terms such as "first" and "second" that may appear are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, terms such as "comprising", "including" or any other variant thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements not only includes those elements, but also includes other elements not expressly listed, or also includes elements inherent to such process, method, article or device. Without further limitation, elements defined by the statement "including one..." do not exclude the existence of additional identical elements in the process, method, article or device including the said elements.

[0055] The features and performance of the present invention will be further described in detail below with reference to the embodiments.

[0056] Specific Embodiment 1 of the weight rod for the test instrument of the present invention:

[0057] As Figures 1 to 4 shown, the weight rod for the test instrument includes a housing 1, a main rod 2 and a plug 3.

[0058] The housing 1 extends vertically, and openings are provided at both the upper end and the lower end of the housing 1. The main rod 2 is inserted inside the housing 1, and the main rod 2 is in up-and-down guiding sliding fit with the housing 1. The upper end of the main rod 2 extends out of the housing 1 from the opening at the upper end of the housing 1, and the upper end of the main rod 2 is used for connecting to the test instrument body. The lower end of the main rod 2 is in up-and-down stop fit with the housing 1, so that when the main rod 2 slides upward relative to the housing 1, the main rod 2 will not be separated from the housing 1 through the opening at the upper end of the housing 1. The opening at the lower end of the housing 1 is an insertion port, and the main rod 2 is inserted into the housing 1 from bottom to top through the insertion port.

[0059] The plug 3 is used to block the opening at the lower end of the housing 1, and the plug 3 is detachably connected to the lower end of the housing 1. In this embodiment, the plug 3 and the lower end of the housing 1 are detachably connected by a threaded connection. Specifically, an external thread is provided on the outer peripheral surface of the plug 3, and an internal thread that mates with the external thread on the outer peripheral surface of the plug 3 is provided on the inner wall surface at the lower end of the housing 1. The detachable connection between the plug 3 and the housing 1 is achieved by means of a threaded connection, making the disassembly and assembly of the plug 3 and the housing 1 simpler and quicker.

[0060] A clamping hole 4 is provided on the housing 1. Correspondingly, a clamping block 5 is provided on the main rod 2. The clamping block 5 includes a stopping surface 501 for upper and lower stopping cooperation with the upper hole wall surface of the clamping hole 4, and a stopping portion 502 for stopping cooperation with the inner wall surface of the housing 1. The stopping portion 502 is located above the stopping surface 501, and the clamping block 5 is swingably arranged on the main rod 2. Specifically, a clamping block mounting groove 6 is provided on the main rod 2, and the clamping block 5 is swingably arranged in the clamping block mounting groove 6 through a pin 7. A spring 8 is provided in the clamping block mounting groove 6, and the spring 8 is in pressing cooperation with the clamping block 5.

[0061] Particularly, a threaded adjusting member for adjusting the compression amount of the spring 8 is threadedly connected to the main rod 2. Specifically, a threaded hole communicating with the clamping block mounting groove 6 is provided on the main rod 2, and the threaded adjusting member is screwed into the threaded hole. In this embodiment, the threaded adjusting member is a setscrew 9. In other embodiments, the threaded adjusting member can also be a screw rod. The provision of the threaded adjusting member can adjust the compression amount of the spring 8 by screwing the threaded adjusting member, thereby adjusting the elastic force of the spring 8 on the clamping block 5.

[0062] One end of the spring 8 is wound and fixed to the setscrew 9, and the other end is in pressing cooperation with the clamping block 5. This arrangement can reduce the risk of the spring 8 becoming loose from the setscrew 9 and being lost.

[0063] The clamping block 5 has a clamping state in which the main rod 2 and the housing 1 are relatively fixed, and an unlocking state in which the main rod 2 and the housing 1 can slide relatively up and down.

[0064] When the clamping block 5 is in the clamping state, the spring 8 presses the clamping block 5 so that the stopping surface 501 of the clamping block 5 is inside the clamping hole 4. The stopping surface 501 of the clamping block 5 gradually slopes downward in the horizontal direction from the inside of the housing 1 to the outside of the housing 1 and is in stopping cooperation with the upper hole wall surface of the clamping hole 4. The stopping portion 502 of the clamping block 5 is in stopping cooperation with the inner wall surface of the housing 1. When the clamping block 5 is in the unlocking state, the clamping block 5 is outside the clamping hole 4, and the main rod 2 and the housing 1 can slide relatively.

[0065] When the weight rod is stuck in the well and the clamping block 5 is in the clamping state, the testing instrument is pulled by the steel wire rope to apply a tensile force to the main rod 2 of the weight rod. The tensile force on the main rod 2 is gradually increased. When the reaction force of the upper hole wall surface of the clamping hole 4 against the stopping surface 501 of the clamping block 5 is greater than the elastic force of the spring 8 on the clamping block 5, the clamping block 5 swings towards the direction of disengaging from the clamping hole 4 to the unlocking state. At this time, the main rod 2 and the housing 1 can slide relative to each other. The steel wire rope is continuously pulled to apply a tensile force to the main rod 2, and the main rod 2 slides rapidly upward relative to the housing 1 until it impacts the housing 1. The upward impact force of the main rod 2 on the housing 1 loosens the weight rod from the well wall, and the weight rod can be pulled out of the well.

[0066] In order to facilitate the connection between the weight rod and the main body of the testing instrument, the upper end of the main rod 2 is detachably connected with a connector 10. The connector 10 and the main rod 2 are detachably connected by threaded connection. In addition, the connector 10 and the testing instrument are also detachably connected by threaded connection.

[0067] In order to facilitate the guiding sliding fit between the main rod 2 and the housing 1, a sliding groove 11 is provided on the inner wall surface of the housing 1. The sliding groove 11 extends up and down along the extending direction of the housing 1, and the upper groove wall of the sliding groove 11 is located below the clamping hole 4. In this embodiment, there are two sliding grooves 11 which are symmetrically arranged on the housing 1. Correspondingly, two sliding blocks 12 are provided at the lower end of the main rod 2, and the two sliding blocks 12 are respectively in guiding sliding fit with a sliding groove 11. In addition, the sliding blocks 12 are used to stop and cooperate with the upper groove wall of the sliding groove 11 when the clamping block 5 is in the unlocking state to cause an impact between the lower end of the main rod 2 and the housing 1. In this embodiment, the sliding blocks 12 and the clamping block mounting groove 6 are arranged at an interval of 90 degrees on the outer peripheral surface of the main rod 2.

[0068] In this embodiment, the clamping hole 4 is a perforation penetrating the housing 1. The clamping hole 4 adopts the structural form of a perforation, which can manually press the clamping block 5 through the clamping hole 4 to make the clamping block 5 in the unlocking state, and pull out the main rod 2 from above the housing 1, which is convenient for inspecting and maintaining the weight rod. Specifically, two clamping holes 4 are provided and symmetrically distributed on the housing 1. Specifically, when one of the two clamping holes 4 is in clamping cooperation with the clamping block 5, the other clamping hole 4 is directly opposite to the set screw 9 so that the adjusting tool can extend in to adjust the set screw 9. This setting makes the adjustment of the set screw 9 more convenient.

[0069] More specifically, a gas passage 13 is provided on the plug 3, and the gas passage 13 communicates the inside of the housing 1 with the outside. Specifically, the gas passage 13 includes a longitudinal air passage 131 and a transverse air passage 132. The upper end opening of the longitudinal air passage 131 communicates with the inside of the housing 1, and the lower end opening communicates with the transverse air passage 132. The openings at both ends of the transverse air passage 132 communicate with the outside. When the main rod 2 slides relatively quickly with respect to the housing 1, a suction effect will be generated. The suction effect will reduce the impact force between the main rod 2 and the housing 1. The setting of the gas passage 13 reduces the suction effect, and thus reduces the adverse effect of the suction effect on the impact force between the main rod 2 and the housing 1.

[0070] The working principle of the weight rod for the testing instrument of the present invention is as follows:

[0071] When the weight rod for the testing instrument gets stuck in the well, the testing instrument is pulled by a steel wire rope to apply a pulling force to the main rod 2 of the weight rod. The stopping surface 501 of the clamping block 5 applies a force to the upper hole wall surface of the clamping hole 4, and the upper hole wall surface of the clamping hole 4 will generate a reaction force on the stopping surface 501 of the clamping block 5. The pulling force on the main rod 2 is gradually increased. When the reaction force of the upper hole wall surface of the clamping hole 4 on the stopping surface 501 of the clamping block 5 is greater than the elastic force of the spring 8 on the clamping block 5, the clamping block 5 swings in the direction of disengaging from the clamping hole 4 to the unlocked state. At this time, the main rod 2 and the housing 1 can slide relatively. The steel wire rope is continuously pulled to apply a pulling force to the main rod 2, and the main rod 2 slides rapidly upward relative to the housing 1 until it impacts the housing 1. The upward impact force of the main rod 2 on the housing 1 loosens the weight rod from the well wall. When the weight rod is not loosened from the well wall during one impact process, the steel wire rope is relaxed to make the main rod 2 slide downward relative to the housing 1 until the clamping block 5 is in the clamped state again, and then the impact process between the main rod 2 and the housing 1 is repeated. This is repeated many times until the weight rod is loosened from the well wall, and then the weight rod is pulled out.

[0072] In the specific embodiment 2 of the weight rod for the testing instrument of the present invention, which is different from the embodiment 1 described above, the lower end of the housing does not have an installation opening, and the main rod is inserted into the housing through the opening at the upper end of the housing. Specifically, the housing includes a lower housing with a sliding groove and an upper housing screwed onto the upper end of the lower housing. The sliding groove is a through groove. The main rod is inserted into the lower housing through the upper end opening of the lower housing, and then the upper housing is screwed onto the lower housing. When the main rod slides upward relative to the housing, the slider of the main rod impacts the upper housing.

[0073] In the specific embodiment 3 of the weight rod for the testing instrument of the present invention, which is different from the embodiment 1 described above, the housing is provided with a gas passage, and the gas passage communicates the inside of the housing with the outside.

[0074] In the specific embodiment 4 of the weight rod for the testing instrument of the present invention, which is different from the embodiment 1 described above, no set screw is provided on the main rod, and one end of the spring is fixed on the groove wall of the clamping block installation groove, and the other end is in top pressure fit with the clamping block.

[0075] Specific embodiment 5 of the weight rod for the test instrument of the present invention is different from embodiment 1 introduced above in that the clamping hole is a blind hole.

[0076] Specific embodiment 6 of the weight rod for the test instrument of the present invention is different from embodiment 1 introduced above in that there is only one clamping hole, and this clamping hole can be clamped and matched with the clamping block to relatively fix the housing and the main rod.

[0077] Specific embodiment 7 of the weight rod for the test instrument of the present invention is different from embodiment 1 introduced above in that a retaining ring is provided at the lower end of the main rod, and the main rod is in guiding sliding fit with the inner wall surface of the housing through the retaining ring, and a retaining ring is provided at the upper part of the inner wall surface of the housing, and the retaining ring and the retaining ring are in blocking fit, so that when the main rod slides upward relative to the housing, the main rod will not be separated from the housing through the opening at the upper part of the housing.

[0078] Specific embodiment 8 of the weight rod for the test instrument of the present invention is different from embodiment 1 introduced above in that an external thread is provided on the outer peripheral surface of the upper end of the main rod, and this external thread is used for threaded connection with the test instrument body.

[0079] Specific embodiment 9 of the weight rod for the test instrument of the present invention is different from embodiment 1 introduced above in that the connecting head and the main rod are detachably connected by bolts.

[0080] Specific embodiment 10 of the weight rod for the test instrument of the present invention is different from embodiment 1 introduced above in that the plug and the housing are detachably connected by bolts.

[0081] Specific embodiment of the test instrument of the present invention, the test instrument includes a test instrument body and a weight rod, the weight rod is connected to the lower end of the test instrument body, and the structure of the weight rod is the same as the structure of the weight rod for the test instrument introduced in the above embodiments, and will not be described in detail here.

[0082] The above is only the preferred embodiment of the present invention, and it is not intended to limit the present invention. The patent protection scope of the present invention is subject to the claims. All equivalent structural changes made by using the description and drawings of the present invention should be included in the protection scope of the present invention by the same token.

Claims

1. A weight rod for a testing instrument, characterized in that, it includes a housing (1) and a main rod (2): the housing (1) extends vertically and has an opening at the upper end; the main rod (2) is inserted inside the housing (1) and is in vertical guiding and sliding fit with the housing (1), the upper end of the main rod (2) extends out of the housing (1) and is used for connecting with the lower end of the testing instrument body, and a clamping hole (4) is provided on the housing (1); a clamping block (5) is swingably arranged on the main rod (2), and the clamping block (5) includes a stopping surface (501) for vertically stopping and cooperating with the upper hole wall surface of the clamping hole (4) and a stopping portion (502) for stopping and cooperating with the inner wall surface of the housing (1); a spring (8) for pressing against the clamping block is arranged on the main rod (2); the clamping block (5) has a clamping state in which the main rod (2) and the housing (1) are relatively fixed, and also has an unlocking state in which the main rod (2) and the housing (1) can slide vertically relative to each other; when the clamping block (5) is in the clamping state, the spring (8) presses against the clamping block (5) so that the stopping surface (501) of the clamping block (5) is inside the clamping hole (4), the stopping surface (501) of the clamping block (5) gradually slopes downward in the horizontal direction from inside the housing (1) to outside the housing (1) and is in stopping cooperation with the upper hole wall surface of the clamping hole (4), and the stopping portion (502) of the clamping block (5) is in stopping cooperation with the inner wall surface of the housing (1); when the clamping block (5) is in the unlocking state, the clamping block (5) is outside the clamping hole (4); the lower end of the main rod (2) is in vertical stopping cooperation with the housing (1) when the clamping block is in the unlocking state; when the weight rod is stuck in the well and the clamping block (5) is in the clamping state, increase the pulling force on the main rod (2) until the reaction force of the upper hole wall surface of the clamping hole (4) on the stopping surface (501) of the clamping block (5) causes the clamping block (5) to overcome the elastic force of the spring (8) on the clamping block (5), and the clamping block (5) swings in the direction of disengaging from the clamping hole (4) to the unlocking state, and continue to pull the main rod (2) to make the main rod (2) slide upward relative to the housing (1), and the lower end of the main rod (2) collides with the housing (1).

2. The weight rod for a testing instrument according to claim 1, characterized in that, the lower end of the housing (1) has an insertion opening for the main rod (2) to be inserted from bottom to top, and a plug (3) is provided at the insertion opening of the housing (1), the plug (3) is used for plugging the insertion opening of the housing (1), and the plug (3) is detachably connected to the lower end of the housing (1).

3. The weight rod for a testing instrument according to claim 2, characterized in that, the plug (3) is provided with a gas passage (13), and the gas passage (13) is used for communicating the outside with the inside of the housing (1).

4. The weight rod for a testing instrument according to any one of claims 1-3, characterized in that, a threaded adjusting member for adjusting the compression amount of the spring (8) is threadedly connected to the main rod (2), and the threaded adjusting member is in pressing cooperation with the spring (8).

5. The weight rod for a testing instrument according to claim 4, characterized in that, the threaded adjusting member is a setscrew (9), one end of the spring (8) is wound and fixed to the setscrew (9), and the other end is in pressing cooperation with the clamping block (5).

6. The weight rod for a testing instrument according to any one of claims 1-3, characterized in that, The card hole (4) is a perforation penetrating through the housing (1).

7. The weight rod for a testing instrument according to claim 6, characterized in that the card holes (4) are arranged in pairs. When one of the two card holes (4) in a pair is in clamping fit with the card block (5), the other card hole (4) is aligned with the threaded adjusting member so that the adjusting tool can extend into it to adjust the threaded adjusting member.

8. The weight rod for a testing instrument according to any one of claims 1-3, characterized in that a sliding groove (11) extending vertically along the extending direction of the housing (1) is provided on the inner wall surface of the housing (1). A sliding block (12) is provided at the lower end of the main rod (2). The sliding block (12) is in sliding fit with the sliding groove (11), and the sliding block (12) is used for abutting against the upper groove wall of the sliding groove (11) when the card block (5) is in the unlocked state to cause an impact between the lower end of the main rod (2) and the housing (1).

9. The weight rod for a testing instrument according to any one of claims 1-3, characterized in that a connecting head (10) is provided at the upper end of the main rod (2). The connecting head (10) is used for detachably connecting with the testing instrument body, and the connecting head (10) is detachably connected with the main rod (2).

10. A testing instrument, comprising a testing instrument body and a weight rod, the weight rod being connected to the lower end of the testing instrument body, characterized in that the weight rod is the weight rod for a testing instrument according to any one of claims 1-9.

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